未来就是现在的延续,过去就是完成的现在

Java后台项目那些事

1.从Spring boot官网根据需求下载脚手架或者到GitHub上去搜索对应的脚手架项目,D_iao ^0^

• 文件目录如下(此处generatorConfig.xml 和 log4j2.xml文件请忽略,后续会讲解)


 2.使用Mybatis代码自动构建插件生成代码

•  gradle 相关配置

// Mybatis 代码自动生成所引入的包
compile group: 'org.mybatis.generator', name: 'mybatis-generator-core', version: '1.3.3'

// MyBatis代码自动生成插件工具
apply plugin: "com.arenagod.gradle.MybatisGenerator"

configurations {
    mybatisGenerator
}

mybatisGenerator {
    verbose = true
    // 配置文件路径
    configFile = 'src/main/resources/generatorConfig.xml'
}

•  generatorConfig.xml配置详解

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>

    <!--数据库驱动包路径 -->
    <classPathEntry
            <!--此驱动包路径可在项目的包库中找到,复制过来即可-->
            location="C:\Users\pc\.gradle\caches\modules-2\files-2.1\mysql\mysql-connector-java\5.1.38\dbbd7cd309ce167ec8367de4e41c63c2c8593cc5\mysql-connector-java-5.1.38.jar"/>

    <context id="mysql" targetRuntime="MyBatis3">
        <!--关闭注释 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!--数据库连接信息 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/xxx" userId="root"
                        password="">
        </jdbcConnection>

        <!--生成的model 包路径 ,其中rootClass为model的基类,配置之后他会自动继承该类作为基类,trimStrings会为model字串去空格-->
        <javaModelGenerator targetPackage="com.springboot.mybatis.demo.model"
                            targetProject="D:/self-code/spring-boot-mybatis/spring-boot-mybatis/src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
            <property name="rootClass" value="com.springboot.mybatis.demo.model.common.BaseModel"/>
        </javaModelGenerator>

        <!--生成mapper xml文件路径 -->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="D:/self-code/spring-boot-mybatis/spring-boot-mybatis/src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!-- 生成的Mapper接口的路径 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.springboot.mybatis.demo.mapper" targetProject="D:/self-code/spring-boot-mybatis/spring-boot-mybatis/src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!-- 对应的表 这个是生成Mapper xml文件的基础,enableCountByExample如果为true则会在xml文件中生成样例,过于累赘所以不要-->
        <table tableName="tb_user" domainObjectName="User"
               enableCountByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               enableUpdateByExample="false"></table>
    </context>


</generatorConfiguration>

以上配置中注意targetProject路径请填写绝对路径,避免错误,其中targetPackage是类所处的包路径(确保包是存在的,否则无法生成),也就相当于

•  代码生成

配置完成之后首先得在数据库中新建对应的表,然后确保数据库能正常访问,最后在终端执行gradle mbGenerator或者点击如下任务

成功之后它会生成model、mapper接口以及xml文件

 


 3.集成日志

• gradle 相关配置

compile group: 'org.springframework.boot', name: 'spring-boot-starter-log4j2', version: '1.4.0.RELEASE'

// 排除冲突
configurations {
    mybatisGenerator
    compile.exclude module: 'spring-boot-starter-logging'
}

当没有引入spring-boot-starter-log4j2包时会报错:java.lang.IllegalStateException: Logback configuration error detected Logback 配置错误声明

原因参考链接;https://blog.csdn.net/blueheart20/article/details/78111350?locationNum=5&fps=1

解决方案:排除依赖 spring-boot-starter-logging

what???

排除依赖之后使用的时候又报错:Failed to load class "org.slf4j.impl.StaticLoggerBinder" 加载slf4j.impl.StaticLoggerBinder类失败

原因参考链接:https://blog.csdn.net/lwj_199011/article/details/51853110

解决方案:添加依赖 spring-boot-starter-log4j2 此包所依赖的包如下:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starters</artifactId>
        <version>1.4.0.RELEASE</version>
    </parent>
    <artifactId>spring-boot-starter-log4j2</artifactId>
    <name>Spring Boot Log4j 2 Starter</name>
    <description>Starter for using Log4j2 for logging. An alternative to
        spring-boot-starter-logging</description>
    <url>http://projects.spring.io/spring-boot/</url>
    <organization>
        <name>Pivotal Software, Inc.</name>
        <url>http://www.spring.io</url>
    </organization>
    <properties>
        <main.basedir>${basedir}/../..</main.basedir>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-slf4j-impl</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jul-to-slf4j</artifactId>
        </dependency>
    </dependencies>
</project>

它依赖了 log4j-slf4j-impl ,使用的是log4j2日志框架。

这里涉及到log4j、logback、log4j2以及slf4j相关概念,那么它们是啥关系呢?unbelievable...相关知识如下:

slf4j、log4j、logback、log4j2 
日志接口(slf4j) slf4j是对所有日志框架制定的一种规范、标准、接口,并不是一个框架的具体的实现,因为接口并不能独立使用,需要和具体的日志框架实现配合使用(如log4j、logback)
日志实现(log4j、logback、log4j2) log4j是apache实现的一个开源日志组件 logback同样是由log4j的作者设计完成的,拥有更好的特性,用来取代log4j的一个日志框架,是slf4j的原生实现 Log4j2是log4j 1.x和logback的改进版,据说采用了一些新技术(无锁异步、等等),使得日志的吞吐量、性能比log4j 1.x提高10倍,并解决了一些死锁的bug,而且配置更加简单灵活,官网地址: http://logging.apache.org/log4j/2.x/manual/configuration.html 为什么需要日志接口,直接使用具体的实现不就行了吗? 接口用于定制规范,可以有多个实现,使用时是面向接口的(导入的包都是slf4j的包而不是具体某个日志框架中的包),即直接和接口交互,不直接使用实现,所以可以任意的更换实现而不用更改代码中的日志相关代码。 比如:slf4j定义了一套日志接口,项目中使用的日志框架是logback,开发中调用的所有接口都是slf4j的,不直接使用logback,调用是 自己的工程调用slf4j的接口,slf4j的接口去调用logback的实现,可以看到整个过程应用程序并没有直接使用logback,当项目需要更换更加优秀的日志框架时(如log4j2)只需要引入Log4j2的jar和Log4j2对应的配置文件即可,完全不用更改Java代码中的日志相关的代码logger.info(“xxx”),也不用修改日志相关的类的导入的包(import org.slf4j.Logger; import org.slf4j.LoggerFactory;)
使用日志接口便于更换为其他日志框架,适配器作用 log4j、logback、log4j2都是一种日志具体实现框架,所以既可以单独使用也可以结合slf4j一起搭配使用)

• 到此我们使用的是Log4j2日志框架,接下来是配置log4j(可以使用properties、xml以及yml三种方式配置,这里使用xml形式;有关log4j详细配置讲解参考链接:https://blog.csdn.net/menghuanzhiming/article/details/77531977),具体配置详解如下:

<?xml version="1.0" encoding="UTF-8"?>
<!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
 <!--Configuration后面的status,这个用于设置log4j2自身内部的信息输出,可以不设置,当设置成trace时,你会看到log4j2内部各种详细输出-->
<!--monitorInterval:Log4j能够自动检测修改配置 文件和重新配置本身,设置间隔秒数-->
<Configuration status="WARN">

    <!--定义一些属性-->
    <Properties>
        <Property name="PID">????</Property>
        <Property name="LOG_PATTERN">
            [%d{yyyy-MM-dd HH:mm:ss.SSS}] - ${sys:PID} --- %c{1}: %m%n
        </Property>
    </Properties>

    <!--输出源,用于定义日志输出的地方-->
    <Appenders>

        <!--输出到控制台-->
        <Console name="Console" target="SYSTEM_OUT" follow="true">
            <PatternLayout
                    pattern="${LOG_PATTERN}">
            </PatternLayout>
        </Console>

        <!--文件会打印出所有信息,这个log每次运行程序会自动清空,由append属性决定,适合临时测试用-->
        <!--append为TRUE表示消息增加到指定文件中,false表示消息覆盖指定的文件内容,默认值是true-->
        <!--<File name="File" fileName="logs/log.log" append="false">-->
            <!--<PatternLayout>-->
                <!--<pattern>[%-5p] %d %c - %m%n</pattern>-->
            <!--</PatternLayout>-->
        <!--</File>-->

        <!--这个会打印出所有的信息,每次大小超过size,则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩,作为存档 -->
        <RollingFile name="RollingAllFile" fileName="logs/all/all.log"
                     filePattern="logs/all/$${date:yyyy-MM}/all-%d{yyyy-MM-dd}-%i.log.gz">
            <PatternLayout
                    pattern="${LOG_PATTERN}" />
            <Policies>
                <!--以下两个属性结合filePattern使用,完成周期性的log文件封存工作-->
                <!--TimeBasedTriggeringPolicy 基于时间的触发策略,以下是它的两个参数:
                    1.interval,integer型,指定两次封存动作之间的时间间隔。单位:以日志的命名精度来确定单位,比如yyyy-MM-dd-HH 单位为小时,yyyy-MM-dd-HH-mm 单位为分钟
                    2.modulate,boolean型,说明是否对封存时间进行调制。若modulate=true,则封存时间将以0点为边界进行偏移计算。比如,modulate=true,interval=4hours,那么假设上次封存日志的时间为03:00,则下次封存日志的时间为04:00,之后的封存时间依次为08:00,12:00,16:00-->
                <!--<TimeBasedTriggeringPolicy/>-->
                <!--SizeBasedTriggeringPolicy 基于日志文件大小的触发策略,以下配置解释为:
                    当单个文件达到20M后,会自动将以前的内容,先创建类似 2014-09(年-月)的目录,然后按 "xxx-年-月-日-序号"命名,打成压缩包-->
                <SizeBasedTriggeringPolicy size="200 MB"/>
            </Policies>
        </RollingFile>

        <!-- 
添加过滤器ThresholdFilter,可以有选择的输出某个级别及以上的类别 onMatch="ACCEPT" onMismatch="DENY" 意思是匹配就接受,否则直接拒绝。
如果有组合过滤的话会用到NEUTRA·L,表示中立,eg:
<Filters>
    <ThresholdFilter level="error" onMatch="DENY" onMismatch="NEUTRAL"/>
    <ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY"/>
      </Filters>
上面的意思就是:如果匹配到error及以上的日志级别就拒接,没有匹配到的则保持中立即不拒绝也不接受,等待下一个过滤器过滤;然后第二个过滤器匹配到warn及以上的就接受,未匹配到的就拒绝,由于第一个拒绝了error及以上的所以这个组合过滤的结果就是只记录warn日志
--> <RollingFile name="RollingErrorFile" fileName="logs/error/error.log" filePattern="logs/error/$${date:yyyy-MM}/%d{yyyy-MM-dd}-%i.log.gz"> <ThresholdFilter level="ERROR"/> <PatternLayout pattern="${LOG_PATTERN}" /> <Policies> <!--<TimeBasedTriggeringPolicy/>--> <SizeBasedTriggeringPolicy size="200 MB"/> </Policies> </RollingFile> <RollingFile name="RollingWarnFile" fileName="logs/warn/warn.log" filePattern="logs/warn/$${date:yyyy-MM}/%d{yyyy-MM-dd}-%i.log.gz"> <Filters> <ThresholdFilter level="WARN"/> <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL"/> </Filters> <PatternLayout pattern="${LOG_PATTERN}" /> <Policies> <!--<TimeBasedTriggeringPolicy/>--> <SizeBasedTriggeringPolicy size="200 MB"/> </Policies> </RollingFile> </Appenders> <!--然后定义Loggers,只有定义了Logger并引入的Appender,Appender才会生效--> <Loggers> <Logger name="org.hibernate.validator.internal.util.Version" level="WARN"/> <Logger name="org.apache.coyote.http11.Http11NioProtocol" level="WARN"/> <Logger name="org.apache.tomcat.util.net.NioSelectorPool" level="WARN"/> <Logger name="org.apache.catalina.startup.DigesterFactory" level="ERROR"/> <Logger name="org.springframework" level="INFO" /> <Logger name="com.springboot.mybatis.demo" level="DEBUG"/>
    <Logger  name="validateEventLog" level="info" additivity="false">
    <AppenderRef ref="RollingFileAbandonEvent"/>
    </Logger>

    <!--
这里的name是在声明 log 对象时传进去的名字,eg: private final Logger LOG = LogManager.getLogger("logName");
一般我们会使用类的全限定名作为log的名字,eg: private final Logger LOG = LogManager.getLogger(this.getClass());
-->
<!--以上的logger会继承Root,也就是说如果在Logger里头没有配置appender,日志就会默认输出到Root下定义的符合条件的Appender中,若不想让它继承可以设置 additivity="false" 并可以在Logger中设置 <AppenderRef ref="Console"/> 指定输出到Console--> <Root level="INFO"> <AppenderRef ref="Console" /> <AppenderRef ref="RollingAllFile"/> <AppenderRef ref="RollingErrorFile"/> <AppenderRef ref="RollingWarnFile"/> </Root> </Loggers> </Configuration>

yml配置案例:

Configuration:  
  status: info  
  Properties: # 定义全局变量  
    Property: # 缺省配置(用于开发环境)。其他环境需要在VM参数中指定,如下:  
      - name: log.path  
        value: ./logs/
      - name: project.name  
        value: xx
      - name: info.file.name
        value: ${log.path}/${project.name}.info.log
      - name: error.file.name
        value: ${log.path}/${project.name}.error.log
      - name: kafka.sync.file.name
        value: ${log.path}/${project.name}.kafka.sync.log
  Appenders:  
    Console:  #输出到控制台  
      name: POSEIDON  
      target: SYSTEM_OUT  
      ThresholdFilter:  
        level: info # “sys:”表示:如果VM参数中没指定这个变量值,则使用本文件中定义的缺省全局变量值  
        onMatch: ACCEPT  
        onMismatch: DENY  
      PatternLayout:  
        pattern: "%d{MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"  
    RollingFile: # 输出到文件,超过128MB归档  
      - name: infolog
        ThresholdFilter: 
          level: info # “sys:”表示:如果VM参数中没指定这个变量值,则使用本文件中定义的缺省全局变量值
          onMatch: ACCEPT 
          onMismatch: DENY   
        ignoreExceptions: false  
        fileName: ${info.file.name}  
        PatternLayout: 
          pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"
        filePattern: ${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.error.log.gz
        PatternLayout:  
          pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n" 
        Policies:  
          SizeBasedTriggeringPolicy:  
            size: "128 MB"  
        DefaultRolloverStrategy:  
          max: 1000
      - name: ROLLINGFILEERROR 
        ThresholdFilter: 
          level: error
          onMatch: ACCEPT
          onMismatch: DENY
        fileName: ${error.file.name}
        PatternLayout: 
          pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"
        filePattern: ${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.error.log.gz
        PatternLayout:
          pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"
        Policies:
          SizeBasedTriggeringPolicy:
            size: "128 MB"
        DefaultRolloverStrategy:
          max: 1000
      - name: kafkaSyncLog
        ThresholdFilter:
          level: info
          onMatch: ACCEPT
          onMismatch: DENY
        fileName: ${kafka.sync.file.name}
        PatternLayout:
          pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"
        filePattern: ${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.kafka.sync.log.gz
        PatternLayout:
          pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"
     // 以下是清理策略:每个log文件达到128M时则会打成一个zip包,最大允许1000个zip包,超过的会删除掉老的zip包 Policies: SizeBasedTriggeringPolicy: size: "128 MB" DefaultRolloverStrategy: max: 1000 Loggers: Root: // 所有文件的对应级别的日志都会往Root里面配置的对应级别的日志文件里打 level: info AppenderRef: - ref: POSEIDON - ref: infolog - ref: ROLLINGFILEERROR Logger: - name: com.xx.log.common level: error - name: com.xx.xx.xx.xx.xx.kafka // 这里指定某个类的日志输出到自定义的logger文件里,注意:additivity = false为此类的日志不会输出到Root里面的logger文件里;kafkaSyncLog不加入到Root里是因为也不想让其他文件的日志打印到kafkaSyncLog日志文件里 additivity: false level: info AppenderRef: - ref: kafkaSyncLog

 到此我们就算是把日志集成进去了,可以在终端看到各种log,very exciting!!! 

log4j还可以发送邮件

添加依赖:

compile group: 'org.springframework.boot', name: 'spring-boot-starter-mail', version: '2.0.0.RELEASE'

修改log4j配置:

在appender中添加如下:
 <!-- subject: 邮件主题  to: 接收人,多个以逗号隔开  from: 发送人  replyTo: 发送账号 smtp: QQ查看链接https://service.mail.qq.com/cgi-bin/help?subtype=1&no=167&id=28 smtpDebug: 开启详细日志 smtpPassword: 授权码,参看https://service.mail.qq.com/cgi-bin/help?subtype=1&&id=28&&no=1001256 smtpUsername: 用户名-->
 <SMTP name="Mail" subject="Error Log" to="xxx.com" from="xxx@qq.com" replyTo="xxx@qq.com"
              smtpProtocol="smtp" smtpHost="smtp.qq.com" smtpPort="587" bufferSize="50" smtpDebug="false"
              smtpPassword="授权码" smtpUsername="xxx.com">
 </SMTP>

在root里添加上面的appender让其生效
<AppenderRef ref="Mail" level="error"/>

 搞定!

总结:Log4j其主要就是Appender和Logger两部分,前者负责指定日志输出位置,后者指定日志输入来源。

注:以上仅仅是个人经验总结,Log4j的功能还有很多很多,比如日志输出到ArangoDB、MySQL、Kafka等等,详细可查看官方文档,很详细!!!


 4.集成MybatisProvider

• Why ?

    有了它我们可以通过注解的方式结合动态SQL实现基本的增删改查操作,而不需要再在xml中写那么多重复繁琐的SQL了

• Come on ↓

  First: 定义一个Mapper接口并实现基本操作,如下:

package com.springboot.mybatis.demo.mapper.common;

import com.springboot.mybatis.demo.mapper.common.provider.AutoSqlProvider;
import com.springboot.mybatis.demo.mapper.common.provider.MethodProvider;
import com.springboot.mybatis.demo.model.common.BaseModel;
import org.apache.ibatis.annotations.DeleteProvider;
import org.apache.ibatis.annotations.InsertProvider;
import org.apache.ibatis.annotations.SelectProvider;
import org.apache.ibatis.annotations.UpdateProvider;

import java.io.Serializable;
import java.util.List;

public interface BaseMapper<T extends BaseModel, Id extends Serializable> {

    @InsertProvider(type = AutoSqlProvider.class, method = MethodProvider.SAVE)
    int save(T entity);

    @DeleteProvider(type = AutoSqlProvider.class, method = MethodProvider.DELETE_BY_ID)
    int deleteById(Id id);

    @UpdateProvider(type = AutoSqlProvider.class, method = MethodProvider.UPDATE_BY_ID)
    int updateById(Id id);

    @SelectProvider(type = AutoSqlProvider.class, method = MethodProvider.FIND_ALL)
    List<T> findAll(T entity);

    @SelectProvider(type = AutoSqlProvider.class, method = MethodProvider.FIND_BY_ID)
    T findById(T entity);

    @SelectProvider(type = AutoSqlProvider.class, method = MethodProvider.FIND_AUTO_BY_PAGE)
    List<T> findAutoByPage(T entity);
}

其中AutoSqlProvider是提供sql的类,MethodProvider是定义好我们使用MybatisProvider需要实现的基本持久层方法,这两个方法具体实现如下:

package com.springboot.mybatis.demo.mapper.common.provider;

import com.google.common.base.CaseFormat;
import com.springboot.mybatis.demo.mapper.common.provider.model.MybatisTable;
import com.springboot.mybatis.demo.mapper.common.provider.utils.ProviderUtils;
import org.apache.ibatis.jdbc.SQL;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.util.List;

public class AutoSqlProvider {
    private static Logger logger = LoggerFactory.getLogger(AutoSqlProvider.class);

    public String findAll(Object obj) {
        MybatisTable mybatisTable = ProviderUtils.getMybatisTable(obj);
        List<Field> fields = mybatisTable.getMybatisColumnList();
        SQL sql = new SQL();
        fields.forEach(field -> sql.SELECT(CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, field.getName())));
        sql.FROM(mybatisTable.getName());
        logger.info(sql.toString());
        return sql.toString();
    }

    public String save(Object obj) {
     ...
return null; } public String deleteById(String id) {
     ...
return null; } public String findById(Object obj) {
...
return null; } public String updateById(Object obj) {
...
return null; } public String findAutoByPage(Object obj) { return null; } }
package com.springboot.mybatis.demo.mapper.common.provider;

public class MethodProvider {
    public static final String SAVE = "save";
    public static final String DELETE_BY_ID = "deleteById";
    public static final String UPDATE_BY_ID = "updateById";
    public static final String FIND_ALL = "findAll";
    public static final String FIND_BY_ID = "findById";
    public static final String FIND_AUTO_BY_PAGE = "findAutoByPage";
}

注意:

1.如果你在BaseMapper中定义了某个方法一定要在SqlProvider类中去实现该方法,否则将报找不到该方法的错误

2.在动态拼接SQL的时候遇到一个问题:即使开启了驼峰命名转换,在拼接的时候依然需要手动将表属性转换,否则不会自动转换

3.在SqlProvider中的SQL log可以去除,因为在集成日志的时候已经配置好了

4.ProviderUtils是通过反射的方式拿到表的一些基本属性:表名,表属性

•  到这里MybatisProvider的基础配置已经准备好,接下去就是让每一个mapper接口去继承我们这个基础Mapper,这样所有的基础增删改查都由BaseMapper负责,如下:

package com.springboot.mybatis.demo.mapper;

import com.springboot.mybatis.demo.mapper.common.BaseMapper;
import com.springboot.mybatis.demo.model.User;

import java.util.List;

public interface UserMapper extends BaseMapper<User,String> {

}

这样UserMapper就不需要再关注那些基础的操作了,wonderful !!!


 5. 整合JSP过程

• 引入核心包

compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: '2.0.0.RELEASE'
// 注意此处一定要是compile或者缺省,不能使用providedRuntime否则jsp无法渲染
compile group: 'org.apache.tomcat.embed', name: 'tomcat-embed-jasper', version: '9.0.6' 

providedRuntime group: 'org.springframework.boot', name: 'spring-boot-starter-tomcat', version: '2.0.2.RELEASE' // 此行代码是用于解决内置tomcat和外部tomcat冲突问题,若仅使用内置tomcat则无需此行代码

这是两个基本的包,其中spring-boot-starter-web会引入tomcat也就是我们常说的SpringBoot内置的tomcat,而tomcat-embed-jasper是解析jsp的包,如果这个包没有引入或是有问题则无法渲染jsp页面

• 修改Application启动类

@EnableTransactionManagement 
@SpringBootApplication 
public class Application extends SpringBootServletInitializer { 
    
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        setRegisterErrorPageFilter(false);
        return application.sources(Application.class);
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class, args);
    }
}

注意:启动类必须继承SpringBootServletInitializer 类并重写configure方法

• 创建jsp页面(目录详情如下)

• 接下來就是配置如何去获取jsp页面了,有两中选择

一:通过在application.properties文件中配置

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

然后创建controller(注意:在Spring 2.0之后如果要返回jsp页面必须使用@Controller而不能使用@RestController)

@Controller // spring 2.0 如果要返回jsp页面必须使用Controller而不能使用RestController
public class IndexController {

    @GetMapping("/")
    public String index() {
        return "index";
    }
}

二:通过配置文件实现,这样的话直接请求 http:localhost:8080/就能直接获取到index.jsp页面,省去了controller代码的书写

@Configuration
@EnableWebMvc
public class WebMvcConfig implements WebMvcConfigurer {


// /static (or /public or /resources or /META-INF/resources
    @Bean
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        return resolver;
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
    }

  // 此方法如果不重写的话将无法找到index.jsp资源 @Override public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) { configurer.enable(); } }

 6.集成Shiro认证和授权以及Session

• shiro核心

认证、授权、会话管理、缓存、加密

集成认证过程

(1)引包(注:包是按需引用的,以下只是个人构建时候引用的,仅供参考↓)

    // shiro
    compile group: 'org.apache.shiro', name: 'shiro-core', version: '1.3.2' // 必引包,shiro核心包
    compile group: 'org.apache.shiro', name: 'shiro-web', version: '1.3.2' // 与web整合的包
    compile group: 'org.apache.shiro', name: 'shiro-spring', version: '1.3.2' // 与spring整合的包
    compile group: 'org.apache.shiro', name: 'shiro-ehcache', version: '1.3.2' // shiro缓存

(2)shiro配置文件

@Configuration
public class ShiroConfig {
    @Bean(name = "shiroFilter")
    public ShiroFilterFactoryBean shiroFilterFactoryBean() {
        ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
        //拦截器Map
        Map<String,String> filterChainDefinitionMap = new LinkedHashMap<String,String>();
        //配置不会被拦截的路径
        filterChainDefinitionMap.put("/static/**", "anon");
        //配置退出
        filterChainDefinitionMap.put("/logout", "logout");
     //配置需要认证才能访问的路径 filterChainDefinitionMap.put("/**", "authc");
     //配置需要认证和admin角色才能访问的路径
     filterChainDefinitionMap.put("user/**","authc,roles[admin]") //注意roles中的角色可以为多个且时and的关系,即要拥有所有角色才能访问,如果要or关系可自行写filter
shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
//配置登陆路径 shiroFilterFactoryBean.setLoginUrl("/login"); //配置登陆成功后跳转的路径 shiroFilterFactoryBean.setSuccessUrl("/index"); //登陆失败跳回登陆界面 shiroFilterFactoryBean.setUnauthorizedUrl("/login"); shiroFilterFactoryBean.setSecurityManager(securityManager()); return shiroFilterFactoryBean; } @Bean public ShiroRealmOne shiroRealmOne() { ShiroRealmOne realm = new ShiroRealmOne(); // 此处是自定义shiro规则 return realm; } @Bean(name = "securityManager") public DefaultWebSecurityManager securityManager() { DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager(); securityManager.setRealm(shiroRealmOne());
     securityManager.setCacheManager(ehCacheManager());
     securityManager.setSessionManager(sessionManager());
return securityManager; }

@Bean(name = "ehCacheManager") // 将用户信息缓存起来
public EhCacheManager ehCacheManager() {
return new EhCacheManager();
}

  @Bean(name = "shiroCachingSessionDAO") // shiroSession
  public SessionDAO shiroCachingSessionDAO() {
  EnterpriseCacheSessionDAO sessionDao = new EnterpriseCacheSessionDAO();
  sessionDao.setSessionIdGenerator(new JavaUuidSessionIdGenerator()); // SessionId生成器
  sessionDao.setCacheManager(ehCacheManager()); // 缓存
   return sessionDao;
  }
  @Bean(name = "sessionManager")
  public DefaultWebSessionManager sessionManager() {
  DefaultWebSessionManager defaultWebSessionManager = new DefaultWebSessionManager();
  defaultWebSessionManager.setGlobalSessionTimeout(1000 * 60);
  defaultWebSessionManager.setSessionDAO(shiroCachingSessionDAO());
  return defaultWebSessionManager;
  }
}

自定义realm,继承了AuthorizationInfo实现简单的登陆验证

package com.springboot.mybatis.demo.config.realm;

import com.springboot.mybatis.demo.model.Permission;
import com.springboot.mybatis.demo.model.Role;
import com.springboot.mybatis.demo.model.User;
import com.springboot.mybatis.demo.service.PermissionService;
import com.springboot.mybatis.demo.service.RoleService;
import com.springboot.mybatis.demo.service.UserService;
import com.springboot.mybatis.demo.service.impl.PermissionServiceImpl;
import com.springboot.mybatis.demo.service.impl.RoleServiceImpl;
import com.springboot.mybatis.demo.service.impl.UserServiceImpl;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.PrincipalCollection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class ShiroRealmOne extends AuthorizingRealm {
    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private UserService userServiceImpl;

    @Autowired
    private RoleService roleServiceImpl;

    @Autowired
    private PermissionService permissionServiceImpl;

    //授权(这里对授权不做讲解,可忽略)
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        logger.info("doGetAuthorizationInfo+" + principalCollection.toString());
        User user = userServiceImpl.findByUserName((String) principalCollection.getPrimaryPrincipal());
        List<Role> roleList = roleServiceImpl.findByUserId(user.getId());
        List<Permission> permissionList = roleList != null && !roleList.isEmpty() ? permissionServiceImpl.findByRoleIds(roleList.stream().map(Role::getId).collect(Collectors.toList())) : new ArrayList<>();
        SecurityUtils.getSubject().getSession().setAttribute(String.valueOf(user.getId()), SecurityUtils.getSubject().getPrincipals());
        SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();
        //赋予角色
        for (Role role : roleList) {
            simpleAuthorizationInfo.addRole(role.getRolName());
        }
        //赋予权限
        for (Permission permission : permissionList) {
            simpleAuthorizationInfo.addStringPermission(permission.getPrmName());
        }
        return simpleAuthorizationInfo;
    }
  // 认证
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        logger.info("doGetAuthenticationInfo +" + authenticationToken.toString());

        UsernamePasswordToken token = (UsernamePasswordToken) authenticationToken;
        String userName = token.getUsername();
        logger.info(userName + token.getPassword());

        User user = userServiceImpl.findByUserName(token.getUsername());
        if (user != null) {
            Session session = SecurityUtils.getSubject().getSession();
            session.setAttribute("user", user);
            return new SimpleAuthenticationInfo(userName, user.getUsrPassword(), getName());
        } else {
            return null;
        }
    }
}

到此shrio认证简单配置就配置好了,接下来就是验证了

控制器

package com.springboot.mybatis.demo.controller;


import com.springboot.mybatis.demo.common.utils.SelfStringUtils;
import com.springboot.mybatis.demo.controller.common.BaseController;
import com.springboot.mybatis.demo.model.User;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;


@Controller
public class IndexController extends BaseController{

    @PostMapping("login")
    public String login(User user, Model model) {
        if (user == null || SelfStringUtils.isEmpty(user.getUsrName()) || SelfStringUtils.isEmpty(user.getUsrPassword()) ) {
            model.addAttribute("warn","请填写完整用户名和密码!");
            return "login";
        }
        Subject subject = SecurityUtils.getSubject();
        UsernamePasswordToken token = new UsernamePasswordToken(user.getUsrName(), user.getUsrPassword());
        token.setRememberMe(true);
        try {
            subject.login(token);
        } catch (AuthenticationException e) {
            model.addAttribute("error","用户名或密码错误,请重新登陆!");
            return "login";
        }
        return "index";
    }

    @GetMapping("login")
    public String index() {
        return "login";
    }

}

login jsp:

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2018/7/29
  Time: 14:34
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登陆</title>
</head>
<body>
    <form action="login" method="POST">
        User Name: <input type="text" name="usrName">
        <br />
        User Password: <input type="text" name="usrPassword" />
        <input type="submit" value="Submit" />
    </form>
    <span style="color: #b3b20a;">${warn}</span>
    <span style="color:#b3130f;">${error}</span>
</body>
</html>

index jsp:

<%--
  Created by IntelliJ IDEA.
  User: pc
  Date: 2018/7/23
  Time: 14:02
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h1>Welcome to here!</h1>
</body>
</html>

正常情况分析:

1.未登录时访问非login接口直接跳回login页面

2.登陆失败返回账户或密码错误

3.未填写完整账户和密码返回请填写完整账户和密码

4.登陆成功跳转到index页面,如果不是admin角色则不能访问user/**的路径,其他可以正常访问


 7.Docker 部署此项目

(1)基础方式部署

• 构建Dockerfile

FROM docker.io/williamyeh/java8

VOLUME /tmp

VOLUME /opt/workspace

#COPY /build/libs/spring-boot-mybatis-1.0-SNAPSHOT.war /opt/workspace/app.jar

EXPOSE 8080

ENTRYPOINT ["java","-jar","/app.jar"]

创建工作目录挂载点,则可以将工作目录挂载到host机上,然而也可以直接将jar包拷贝到容器中去,二者择其一即可。本人较喜欢前者。

•  在Dockerfile文件目录下,执行  docker build -t 镜像名:tag .  构建镜像

•  因为此项目用到了Mysql,所以还得构建一个Mysql容器,运行命令:docker run --name mysql -v /home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/mysql/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=root mysql:5.7;

• 运行刚才构建的项目镜像:docker run --name myproject -v /home/vagrant/workspace/:/opt/workspace --link mysql:mysql -p 8080:8080 -d 镜像名字;挂载的目录 /home/vagrant/workspace 根据自己的目录而定

•  访问8080端口测试

(2)使用docker-compose工具管理单机部署(前提:安装好docker-compose工具)

• 构建docker-compose.yml文件(此处除了有mysql外还加了个redis)

version: '3'
services:
    db:
        image: docker.io/mysql:5.7
        command: --default-authentication-plugin=mysql_native_password
        container_name: db
        volumes:
            - /home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/mysql/data:/var/lib/mysql
            - /home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/mysql/logs:/var/log/mysql
        environment:
            MYSQL_ROOT_PASSWORD: root
            MYSQL_USER: 'test'
            MYSQL_PASS: 'test'
        restart:
            always
        networks:
            - default
    redis:
        image: docker.io/redis
        container_name: redis
        command: redis-server /usr/local/etc/redis/redis.conf
        volumes:
            - /home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/redis/data:/data
            - /home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/redis/redis.conf:/usr/local/etc/redis/redis.conf
        networks:
            - default
    spring-boot:
        build:
            context: ./enjoy-dir/workspace
            dockerfile: Dockerfile
        image:
            spring-boot:1.0-SNAPSHOT
        depends_on:
            - db
            - redis
        links:
            - db:mysql
            - redis:redis
        ports:
            - "8080:8080"
        volumes:
            - /home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/workspace:/opt/workspace
        networks:
            - default
networks:
    default:
        driver: bridge

注意:其中的挂载目录依自己情况而定;redis密码可以在redis.conf文件中配置,其详细配置参见:https://woodenrobot.me/2018/09/03/%E4%BD%BF%E7%94%A8-docker-compose-%E5%9C%A8-Docker-%E4%B8%AD%E5%90%AF%E5%8A%A8%E5%B8%A6%E5%AF%86%E7%A0%81%E7%9A%84-Redis/

• 在docker-compose.yml文件目录下执行:docker-compose up;在此过程中遇到的问题:mysql无法连接 -> 原因:root用户外部无法使用,于是进入mysql中开放root用户,具体参见:https://www.cnblogs.com/goxcheer/p/8797377.html

• 访问 8080 端口测试

(3)使用docker swarm多机分布式部署

• 构建compose文件基于compose 3.0,其详细配置参见官方网页,

version: '3'
services:
    db:
        image: docker.io/mysql:5.7
        command: --default-authentication-plugin=mysql_native_password // 密码加密机制
        volumes:
            - "/home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/mysql/data:/var/lib/mysql"
            - "/home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/mysql/logs:/var/log/mysql"
        environment:
            MYSQL_ROOT_PASSWORD: 'root'
            MYSQL_USER: 'test'
            MYSQL_PASS: 'test'
        restart: // 开机启动
            always
        networks: // mysql 数据库容器连到 mynet overlay 网络,只要连到该网络的容器均可以通过别名 mysql 连接数据库
            mynet:
                aliases:
                    - mysql
        ports: 
            - "3306:3306"
        deploy: // 使用 swarm 部署需要配置一下
            replicas: 1 // stack 启动时默认开启多少个服务
            restart_policy: // 重新构建策略
                condition: on-failure
            placement: // 部署节点
                constraints: [node.role == worker]
    redis:
        image: docker.io/redis
        command: redis-server /usr/local/etc/redis/redis.conf
        volumes:
            - "/home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/redis/data:/data"
            - "/home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/redis/redis.conf:/usr/local/etc/redis/redis.conf"
        networks:
            mynet:
                aliases:
                    - redis
        ports: 
            - "6379:6379"
        deploy: 
            replicas: 1
            restart_policy: 
                condition: on-failure
            placement: 
                constraints: [node.role == worker]
    spring-boot:
        build:
            context: ./enjoy-dir/workspace
            dockerfile: Dockerfile
        image:
            spring-boot:1.0-SNAPSHOT
        depends_on:
            - db
            - redis
        ports: 
            - "8080:8080"
        volumes: 
            - "/home/vagrant/docker-compose/spring-boot-compose/enjoy-dir/workspace:/opt/workspace"
        networks:
            mynet:
                aliases:
                    - spring-boot
        deploy: 
            replicas: 1 
            restart_policy: 
                condition: on-failure
            placement: 
                constraints: [node.role == worker]
networks:
    mynet:

• compose 构建好了则执行 docker stack deploy -c [ compose文件路径 ]  [ stack名字 ];如下:

执行完成之后可以在 manager 节点通过命令 docker service ls 查看 service,如下:

 以及查看 service 状态:

• 通过 Protainer 工具可视化管理 Swarm;首先在任一台机器上安装 Protainer , 安装详解参见:http://www.pangxieke.com/linux/use-protainer-manage-docker.html

安装完成之后则可以进去轻松横向扩展自己的容器也就是service了,自由设置 scale...

 

总结:由 docker 基础命令创建容器在容器数目不多的情况下很实用,但是容器多了怎么办 -> 用 docker-compose 将容器进行分组管理,这样大大提升效率,一个命令即可启用和关闭多个容器。但是在单机下实用 docke-compose 确实能应付得过来,但是多机怎么办 -> 用 docker swarm, 是的有了docker swarm 无论多少台机器,再也不用一个机器一个机器去部署,docker swarm 会自动帮我们把容器部署到资源足够的机器上去,这样一个高效率的分布式部署就变得 so easy...


 8.读写分离

 采用读写分离来降低单个数据库的压力,提高访问速度

(1)配置数据库(将原来的数据库配置改成下面的,这里只配置 master 和 slave1 两个数据库)


#----------------------------------------- 数据库连接(单数据库)----------------------------------------
#spring.datasource.url:=jdbc:mysql://localhost:3306/liuzj?useUnicode=true&characterEncoding=gbk&zeroDateTimeBehavior=convertToNull
#spring.datasource.username=root
#spring.datasource.password=
#spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
#----------------------------------------- 数据库连接(单数据库)----------------------------------------
#----------------------------------------- 数据库连接(读写分离)----------------------------------------
# master(写)
spring.datasource.master.url=jdbc:mysql://192.168.10.16:3306/test
spring.datasource.master.username=root
spring.datasource.master.password=123456
spring.datasource.master.driver-class-name=com.mysql.jdbc.Driver
# slave1(读)
spring.datasource.slave1.url=jdbc:mysql://192.168.10.17:3306/test
spring.datasource.slave1.username=test
spring.datasource.slave1.password=123456
spring.datasource.slave1.driver-class-name=com.mysql.jdbc.Driver
#----------------------------------------- 数据库连接(读写分离)----------------------------------------

 (2)修改初始化 dataSource(将原来的 dataSource 替换成下面的)

    // ----------------------------------- 单数据源 start----------------------------------------

//    @Bean
//    @ConfigurationProperties(prefix = "spring.datasource")
//    public DataSource dataSource() {
//        DruidDataSource druidDataSource = new DruidDataSource();
//        // 数据源最大连接数
//        druidDataSource.setMaxActive(Application.DEFAULT_DATASOURCE_MAX_ACTIVE);
//        // 数据源最小连接数
//        druidDataSource.setMinIdle(Application.DEFAULT_DATASOURCE_MIN_IDLE);
//        // 配置获取连接等待超时的时间
//        druidDataSource.setMaxWait(Application.DEFAULT_DATASOURCE_MAX_WAIT);
//        return druidDataSource;
//    }

    // ----------------------------------- 单数据源 end----------------------------------------


    // ----------------------------------- 多数据源(读写分离)start----------------------------------------

    @Bean
    @ConfigurationProperties("spring.datasource.master")
    public DataSource masterDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    @ConfigurationProperties("spring.datasource.slave1")
    public DataSource slave1DataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    public DataSource myRoutingDataSource(@Qualifier("masterDataSource") DataSource masterDataSource,
                                          @Qualifier("slave1DataSource") DataSource slave1DataSource) {
        Map<Object, Object> targetDataSources = new HashMap<>(2);
        targetDataSources.put(DBTypeEnum.MASTER, masterDataSource);
        targetDataSources.put(DBTypeEnum.SLAVE1, slave1DataSource);
        MyRoutingDataSource myRoutingDataSource = new MyRoutingDataSource();
        myRoutingDataSource.setDefaultTargetDataSource(masterDataSource);
        myRoutingDataSource.setTargetDataSources(targetDataSources);
        return myRoutingDataSource;
    }

    @Resource
    MyRoutingDataSource myRoutingDataSource;

    // ----------------------------------- 多数据源(读写分离)end----------------------------------------

(3)使用 AOP 动态切换数据源(当然也可以采用 mycat,具体配置自行查阅资料)

/**
 * @author admin
 * @date 2019-02-27
 */
@Aspect
@Component
public class DataSourceAspect {

    @Pointcut("!@annotation(com.springboot.mybatis.demo.config.annotation.Master) " +
            "&& (execution(* com.springboot.mybatis.demo.service..*.select*(..)) " +
            "|| execution(* com.springboot.mybatis.demo.service..*.get*(..))" +
            "|| execution(* com.springboot.mybatis.demo.service..*.find*(..)))")
    public void readPointcut() {

    }

    @Pointcut("@annotation(com.springboot.mybatis.demo.config.annotation.Master) " +
            "|| execution(* com.springboot.mybatis.demo.service..*.insert*(..)) " +
            "|| execution(* com.springboot.mybatis.demo.service..*.add*(..)) " +
            "|| execution(* com.springboot.mybatis.demo.service..*.update*(..)) " +
            "|| execution(* com.springboot.mybatis.demo.service..*.edit*(..)) " +
            "|| execution(* com.springboot.mybatis.demo.service..*.delete*(..)) " +
            "|| execution(* com.springboot.mybatis.demo.service..*.remove*(..))")
    public void writePointcut() {

    }

    @Before("readPointcut()")
    public void read() {
        DBContextHolder.slave();
    }

    @Before("writePointcut()")
    public void write() {
        DBContextHolder.master();
    }


    /**
     * 另一种写法:if...else...  判断哪些需要读从数据库,其余的走主数据库
     */
//    @Before("execution(* com.springboot.mybatis.demo.service.impl.*.*(..))")
//    public void before(JoinPoint jp) {
//        String methodName = jp.getSignature().getName();
//
//        if (StringUtils.startsWithAny(methodName, "get", "select", "find")) {
//            DBContextHolder.slave();
//        }else {
//            DBContextHolder.master();
//        }
//    }
}

(4)以上只是主要配置及步骤,像 DBContextHolder 等类此处没有贴出,详细参看 github

(5)主从库搭建步骤

 

配置master
vi /etc/my.cnf #编辑配置文件,在[mysqld]部分添加下面内容

server-id=1   #设置服务器id,为1表示主服务器。
log_bin=mysql-bin  #启动MySQ二进制日志系统。
binlog-do-db=abc  #需要同步的数据库名,如果有多个数据库,可重复此参数,每个数据库一行
binlog-ignore-db = mysql,information_schema  #忽略写入binlog的库

重启master数据库

docker restart mysql

登录master数据库,查看master状态

show master status;

+------------------+----------+--------------+--------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+--------------------------+
| mysql-bin.000001 | 2722 | | mysql,information_schema |
+------------------+----------+--------------+--------------------------+

配置slave
vi /etc/my.cnf #编辑配置文件,在[mysqld]部分添加下面内容
server-id=2   #设置服务器id,为2表示从服务器,这个server-id不做规定,只要主从不一致就好
log_bin=mysql-bin  #启动MySQL二进制日志系统,如果该从服务器还有从服务器的话,需要开启,否则不需要
binlog-do-db=abc  #需要同步的数据库名,如果有多个数据库,可重复此参数,每个数据库一行
binlog-ignore-db = mysql,information_schema  #忽略写入binlog的库,如果该从服务器还有从服务器的话,需要开启,否则不需要

重启slave数据库 

docker restart mysql2

登录从数据库,
change master to master_host='192.168.0.133',master_user='slave',master_password='123456',master_log_file='mysql-bin.000001',master_log_pos=2722;//mysql-bin.000001,2722为之前master查到的状态值。 start slave;//开启从数据库 show slave status; //查看从数据库的状态

 注:在使用主从数据源时需要注意,一个数据源对应一个事务,也就是说,在一个service事务方法中含有查询和新增操作时,数据源在两次操作中不会切换。解决方案有如下两种:

1.在一个事务service方法中不要将查询和新增\插入等混合在一起,可以将查询提出到外层,eg:controller层

2.另开一个线程去执行查询或插入\更新操作,因为同一个事务中的connection是从threadLocal中获取的,一旦重新开了一个线程则会重新去获取连接而不是从threadLocal中获取

总结:参看资料:https://www.cnblogs.com/cjsblog/p/9712457.html & https://www.cnblogs.com/liujiaq/p/6125814.html


 9. 集成 Quartz 分布式定时任务

  • 几个经典的定时任务比较:

  

     Spring 自带定时器Scheduled是单应用服务上的,不支持分布式环境。如果要支持分布式需要任务调度控制插件spring-scheduling-cluster的配合,其原理是对任务加锁实现控制,支持能实现分布锁的中间件。

(1)初始化数据库脚本(可自行到官网下载)

drop table if exists qrtz_fired_triggers;
drop table if exists qrtz_paused_trigger_grps;
drop table if exists qrtz_scheduler_state;
drop table if exists qrtz_locks;
drop table if exists qrtz_simple_triggers;
drop table if exists qrtz_simprop_triggers;
drop table if exists qrtz_cron_triggers;
drop table if exists qrtz_blob_triggers;
drop table if exists qrtz_triggers;
drop table if exists qrtz_job_details;
drop table if exists qrtz_calendars;


create table qrtz_job_details
  (
    sched_name varchar(120) not null,
    job_name  varchar(120) not null,
    job_group varchar(120) not null,
    description varchar(250) null,
    job_class_name   varchar(250) not null,
    is_durable varchar(1) not null,
    is_nonconcurrent varchar(1) not null,
    is_update_data varchar(1) not null,
    requests_recovery varchar(1) not null,
    job_data blob null,
    primary key (sched_name,job_name,job_group)
);

create table qrtz_triggers
  (
    sched_name varchar(120) not null,
    trigger_name varchar(120) not null,
    trigger_group varchar(120) not null,
    job_name  varchar(120) not null,
    job_group varchar(120) not null,
    description varchar(250) null,
    next_fire_time bigint(13) null,
    prev_fire_time bigint(13) null,
    priority integer null,
    trigger_state varchar(16) not null,
    trigger_type varchar(8) not null,
    start_time bigint(13) not null,
    end_time bigint(13) null,
    calendar_name varchar(200) null,
    misfire_instr smallint(2) null,
    job_data blob null,
    primary key (sched_name,trigger_name,trigger_group),
    foreign key (sched_name,job_name,job_group)
        references qrtz_job_details(sched_name,job_name,job_group)
);

create table qrtz_simple_triggers
  (
    sched_name varchar(120) not null,
    trigger_name varchar(120) not null,
    trigger_group varchar(120) not null,
    repeat_count bigint(7) not null,
    repeat_interval bigint(12) not null,
    times_triggered bigint(10) not null,
    primary key (sched_name,trigger_name,trigger_group),
    foreign key (sched_name,trigger_name,trigger_group)
        references qrtz_triggers(sched_name,trigger_name,trigger_group)
);

create table qrtz_cron_triggers
  (
    sched_name varchar(120) not null,
    trigger_name varchar(120) not null,
    trigger_group varchar(120) not null,
    cron_expression varchar(200) not null,
    time_zone_id varchar(80),
    primary key (sched_name,trigger_name,trigger_group),
    foreign key (sched_name,trigger_name,trigger_group)
        references qrtz_triggers(sched_name,trigger_name,trigger_group)
);

create table qrtz_simprop_triggers
  (
    sched_name varchar(120) not null,
    trigger_name varchar(120) not null,
    trigger_group varchar(120) not null,
    str_prop_1 varchar(512) null,
    str_prop_2 varchar(512) null,
    str_prop_3 varchar(512) null,
    int_prop_1 int null,
    int_prop_2 int null,
    long_prop_1 bigint null,
    long_prop_2 bigint null,
    dec_prop_1 numeric(13,4) null,
    dec_prop_2 numeric(13,4) null,
    bool_prop_1 varchar(1) null,
    bool_prop_2 varchar(1) null,
    primary key (sched_name,trigger_name,trigger_group),
    foreign key (sched_name,trigger_name,trigger_group)
    references qrtz_triggers(sched_name,trigger_name,trigger_group)
);

create table qrtz_blob_triggers
  (
    sched_name varchar(120) not null,
    trigger_name varchar(120) not null,
    trigger_group varchar(120) not null,
    blob_data blob null,
    primary key (sched_name,trigger_name,trigger_group),
    foreign key (sched_name,trigger_name,trigger_group)
        references qrtz_triggers(sched_name,trigger_name,trigger_group)
);

create table qrtz_calendars
  (
    sched_name varchar(120) not null,
    calendar_name  varchar(120) not null,
    calendar blob not null,
    primary key (sched_name,calendar_name)
);

create table qrtz_paused_trigger_grps
  (
    sched_name varchar(120) not null,
    trigger_group  varchar(120) not null,
    primary key (sched_name,trigger_group)
);

create table qrtz_fired_triggers
  (
    sched_name varchar(120) not null,
    entry_id varchar(95) not null,
    trigger_name varchar(120) not null,
    trigger_group varchar(120) not null,
    instance_name varchar(200) not null,
    fired_time bigint(13) not null,
    sched_time bigint(13) not null,
    priority integer not null,
    state varchar(16) not null,
    job_name varchar(200) null,
    job_group varchar(200) null,
    is_nonconcurrent varchar(1) null,
    requests_recovery varchar(1) null,
    primary key (sched_name,entry_id)
);

create table qrtz_scheduler_state
  (
    sched_name varchar(120) not null,
    instance_name varchar(120) not null,
    last_checkin_time bigint(13) not null,
    checkin_interval bigint(13) not null,
    primary key (sched_name,instance_name)
);

create table qrtz_locks
  (
    sched_name varchar(120) not null,
    lock_name  varchar(40) not null,
    primary key (sched_name,lock_name)
);

(2)创建并配置好 Quartz 配置文件

# --------------------------------------- quartz ---------------------------------------
# 主要分为scheduler、threadPool、jobStore、plugin等部分
org.quartz.scheduler.instanceName=DefaultQuartzScheduler
org.quartz.scheduler.rmi.export=false
org.quartz.scheduler.rmi.proxy=false
org.quartz.scheduler.wrapJobExecutionInUserTransaction=false
# 实例化ThreadPool时,使用的线程类为SimpleThreadPool
org.quartz.threadPool.class=org.quartz.simpl.SimpleThreadPool
# threadCount和threadPriority将以setter的形式注入ThreadPool实例
# 并发个数
org.quartz.threadPool.threadCount=5
# 优先级
org.quartz.threadPool.threadPriority=5
org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread=true
org.quartz.jobStore.misfireThreshold=5000
# 默认存储在内存中
#org.quartz.jobStore.class = org.quartz.simpl.RAMJobStore
#持久化
org.quartz.jobStore.class=org.quartz.impl.jdbcjobstore.JobStoreTX
org.quartz.jobStore.tablePrefix=QRTZ_
org.quartz.jobStore.dataSource=qzDS
org.quartz.dataSource.qzDS.driver=com.mysql.jdbc.Driver
org.quartz.dataSource.qzDS.URL=jdbc:mysql://192.168.10.16:3306/test?useUnicode=true&characterEncoding=UTF-8
org.quartz.dataSource.qzDS.user=root
org.quartz.dataSource.qzDS.password=123456
org.quartz.dataSource.qzDS.maxConnections=10
# --------------------------------------- quartz -----------------------------------------

(3)初始化 Quartz 的初始Bean

@Configuration
public class QuartzConfig {

    /**
     * 实例化SchedulerFactoryBean对象
     *
     * @return SchedulerFactoryBean
     * @throws IOException 异常
     */
    @Bean(name = "schedulerFactory")
    public SchedulerFactoryBean schedulerFactoryBean() throws IOException {
        SchedulerFactoryBean factoryBean = new SchedulerFactoryBean();
        factoryBean.setQuartzProperties(quartzProperties());
        return factoryBean;
    }

    /**
     * 加载配置文件
     *
     * @return Properties
     * @throws IOException 异常
     */
    @Bean
    public Properties quartzProperties() throws IOException {
        PropertiesFactoryBean propertiesFactoryBean = new PropertiesFactoryBean();
        propertiesFactoryBean.setLocation(new ClassPathResource("/quartz.properties"));
        //在quartz.properties中的属性被读取并注入后再初始化对象
        propertiesFactoryBean.afterPropertiesSet();
        return propertiesFactoryBean.getObject();
    }

    /**
     * quartz初始化监听器
     *
     * @return QuartzInitializerListener
     */
    @Bean
    public QuartzInitializerListener executorListener() {
        return new QuartzInitializerListener();
    }

    /**
     * 通过SchedulerFactoryBean获取Scheduler的实例
     *
     * @return Scheduler
     * @throws IOException 异常
     */
    @Bean(name = "Scheduler")
    public Scheduler scheduler() throws IOException {
        return schedulerFactoryBean().getScheduler();
    }

}

(3)创建 Quartz 的 service 对 job进行一些基础操作,实现动态调度 job

/**
 * @author admin
 * @date 2019-02-28
 */
public interface QuartzJobService {
    /**
     * 添加任务
     *
     * @param scheduler      Scheduler的实例
     * @param jobClassName   任务类名称
     * @param jobGroupName   任务群组名称
     * @param cronExpression cron表达式
     * @throws Exception
     */
    void addJob(Scheduler scheduler, String jobClassName, String jobGroupName, String cronExpression) throws Exception;

    /**
     * 暂停任务
     *
     * @param scheduler    Scheduler的实例
     * @param jobClassName 任务类名称
     * @param jobGroupName 任务群组名称
     * @throws Exception
     */
    void pauseJob(Scheduler scheduler, String jobClassName, String jobGroupName) throws Exception;

    /**
     * 继续任务
     *
     * @param scheduler    Scheduler的实例
     * @param jobClassName 任务类名称
     * @param jobGroupName 任务群组名称
     * @throws Exception
     */
    void resumeJob(Scheduler scheduler, String jobClassName, String jobGroupName) throws Exception;

    /**
     * 重新执行任务
     *
     * @param scheduler      Scheduler的实例
     * @param jobClassName   任务类名称
     * @param jobGroupName   任务群组名称
     * @param cronExpression cron表达式
     * @throws Exception
     */
    void rescheduleJob(Scheduler scheduler, String jobClassName, String jobGroupName, String cronExpression) throws Exception;

    /**
     * 删除任务
     *
     * @param jobClassName
     * @param jobGroupName
     * @throws Exception
     */
    void deleteJob(Scheduler scheduler, String jobClassName, String jobGroupName) throws Exception;

    /**
     * 获取所有任务,使用前端分页
     *
     * @return List
     */
    List<QuartzJob> findList();

}
/**
 * @author admin
 * @date 2019-02-28
 * @see QuartzJobService
 */
@Service
public class QuartzJobServiceImpl implements QuartzJobService {

    @Autowired
    private QuartzJobMapper quartzJobMapper;

    @Override
    public void addJob(Scheduler scheduler, String jobClassName, String jobGroupName, String cronExpression) throws Exception {
        jobClassName = "com.springboot.mybatis.demo.job." + jobClassName;
        // 启动调度器
        scheduler.start();
        //构建job信息
        JobDetail jobDetail = JobBuilder.newJob(QuartzJobUtils.getClass(jobClassName).getClass())
                .withIdentity(jobClassName, jobGroupName)
                .build();
        //表达式调度构建器(即任务执行的时间)
        CronScheduleBuilder builder = CronScheduleBuilder.cronSchedule(cronExpression);
        //按新的cronExpression表达式构建一个新的trigger
        CronTrigger trigger = TriggerBuilder.newTrigger()
                .withIdentity(jobClassName, jobGroupName)
                .withSchedule(builder)
                .build();
        // 配置scheduler相关参数
        scheduler.scheduleJob(jobDetail, trigger);
    }

    @Override
    public void pauseJob(Scheduler scheduler, String jobClassName, String jobGroupName) throws Exception {
        jobClassName = "com.springboot.mybatis.demo.job." + jobClassName;
        scheduler.pauseJob(JobKey.jobKey(jobClassName, jobGroupName));
    }

    @Override
    public void resumeJob(Scheduler scheduler, String jobClassName, String jobGroupName) throws Exception {
        jobClassName = "com.springboot.mybatis.demo.job." + jobClassName;
        scheduler.resumeJob(JobKey.jobKey(jobClassName, jobGroupName));
    }

    @Override
    public void rescheduleJob(Scheduler scheduler, String jobClassName, String jobGroupName, String cronExpression) throws Exception {
        jobClassName = "com.springboot.mybatis.demo.job." + jobClassName;
        TriggerKey triggerKey = TriggerKey.triggerKey(jobClassName, jobGroupName);
        CronScheduleBuilder builder = CronScheduleBuilder.cronSchedule(cronExpression);
        CronTrigger trigger = (CronTrigger) scheduler.getTrigger(triggerKey);
        // 按新的cronExpression表达式重新构建trigger
        trigger = trigger.getTriggerBuilder()
                .withIdentity(jobClassName, jobGroupName)
                .withSchedule(builder)
                .build();
        // 按新的trigger重新设置job执行
        scheduler.rescheduleJob(triggerKey, trigger);
    }

    @Override
    public void deleteJob(Scheduler scheduler, String jobClassName, String jobGroupName) throws Exception {
        jobClassName = "com.springboot.mybatis.demo.job." + jobClassName;
        scheduler.pauseTrigger(TriggerKey.triggerKey(jobClassName, jobGroupName));
        scheduler.unscheduleJob(TriggerKey.triggerKey(jobClassName, jobGroupName));
        scheduler.deleteJob(JobKey.jobKey(jobClassName, jobGroupName));
    }

    @Override
    public List<QuartzJob> findList() {
        return quartzJobMapper.findList();
    }
}

(4)创建 job

/**
 * @author admin
 * @date 2019-02-28
 * @see BaseJob
 */
public class HelloJob implements BaseJob {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        logger.info("hello, I'm quartz job - HelloJob");
    }
}

(5)然后就可以对 job 进行测试(测试添加、暂停、重启等操作)

 总结:

  • 以上只展示集成的主要步骤,详细可参看 github。

  • 在分布式情况下,quartz 会将任务分布在不同的机器上执行,可以将项目打成jar包,开启两个终端模拟分布式查看 job 的执行情况,会发现 HelloJob 会在两个机器上交替执行。

  • 以上集成过程参看资料:https://zhuanlan.zhihu.com/p/38546754


 10. 自动分表

(1)概述:

一般来说,分表都是根据最高频查询的字段进行拆分的。但是考虑到很多功能是需要全局查询,所以在这种情况下,是无法避免全局查询的。
对于经常需要全局查询的部分数据,可以单独做个冗余表,这部分就不要分表了。
对于不经常的全局查询,就只能 union 了。但是通常情况下这种查询响应时间都很久。所以就需要在功能上做一定的限制。比如查询间隔之类的,防止数据库长时间无响应。或者把数据同步到只读从库上,在从库上进行搜索。不影响主库运行。

(2)分表准备

  •  分表可配置化(启用分表,对哪张表进行分表以及分表策略)

  •  如何进行动态分表

(3)实践

  •   首先定义自己的配置类

import com.beust.jcommander.internal.Lists;
import com.springboot.mybatis.demo.common.constant.Constant;
import com.springboot.mybatis.demo.common.utils.SelfStringUtils;

import java.util.Arrays;
import java.util.List;
import java.util.Map;

/**
 * 获取数据源配置信息
 *
 * @author lzj
 * @date 2019-04-09
 */
public class DatasourceConfig {

    private Master master;

    private Slave1 slave1;

    private SubTable subTable;

    public SubTable getSubTable() {
        return subTable;
    }

    public void setSubTable(SubTable subTable) {
        this.subTable = subTable;
    }

    public Master getMaster() {
        return master;
    }

    public void setMaster(Master master) {
        this.master = master;
    }

    public Slave1 getSlave1() {
        return slave1;
    }

    public void setSlave1(Slave1 slave1) {
        this.slave1 = slave1;
    }

    public static class Master {

        private String jdbcUrl;

        private String username;

        private String password;

        private String driverClassName;

        public String getJdbcUrl() {
            return jdbcUrl;
        }

        public void setJdbcUrl(String jdbcUrl) {
            this.jdbcUrl = jdbcUrl;
        }

        public String getUsername() {
            return username;
        }

        public void setUsername(String username) {
            this.username = username;
        }

        public String getPassword() {
            return password;
        }

        public void setPassword(String password) {
            this.password = password;
        }

        public String getDriverClassName() {
            return driverClassName;
        }

        public void setDriverClassName(String driverClassName) {
            this.driverClassName = driverClassName;
        }
    }

    public static class Slave1 {

        private String jdbcUrl;

        private String username;

        private String password;

        private String driverClassName;

        public String getJdbcUrl() {
            return jdbcUrl;
        }

        public void setJdbcUrl(String jdbcUrl) {
            this.jdbcUrl = jdbcUrl;
        }

        public String getUsername() {
            return username;
        }

        public void setUsername(String username) {
            this.username = username;
        }

        public String getPassword() {
            return password;
        }

        public void setPassword(String password) {
            this.password = password;
        }

        public String getDriverClassName() {
            return driverClassName;
        }

        public void setDriverClassName(String driverClassName) {
            this.driverClassName = driverClassName;
        }
    }

    public static class SubTable{

        private boolean enable;

        private String schemaRoot;

        private String schemas;

        private String strategy;

        public String getStrategy() {
            return strategy;
        }

        public void setStrategy(String strategy) {
            this.strategy = strategy;
        }

        public boolean isEnable() {
            return enable;
        }

        public void setEnable(boolean enable) {
            this.enable = enable;
        }

        public String getSchemaRoot() {
            return schemaRoot;
        }

        public void setSchemaRoot(String schemaRoot) {
            this.schemaRoot = schemaRoot;
        }

        public List<String> getSchemas() {
            if (SelfStringUtils.isNotEmpty(this.schemas)) {
                return Arrays.asList(this.schemas.split(Constant.Symbol.COMMA));
            }
            return Lists.newArrayList();
        }

        public void setSchemas(String schemas) {
            this.schemas = schemas;
        }
    }
}

因为此项目是配置了多数据源,所以分为master以及slave两个数据源配置,再加上分表配置

#-------------------自动分表配置-----------------
spring.datasource.sub-table.enable = true
spring.datasource.sub-table.schema-root = classpath*:sub/
spring.datasource.sub-table.schemas = smg_user
spring.datasource.sub-table.strategy = each_day
#-------------------自动分表配置-----------------

以上配置是写在application.properties配置文件中的。然后在将我们定义的配置类DataSourceConfig类交给IOC容器管理,即:

   @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DatasourceConfig datasourceConfig(){
       return new DatasourceConfig();
    }

这样我们便可以通过自定义的配置类拿到相关的配置

   •  然后通过AOP切入mapper方法层,每次调用mapper方法时判断该执行sql的相关实体类是否需要分表

@Aspect
@Component
public class BaseMapperAspect {

    private final static Logger logger = LoggerFactory.getLogger(BaseMapperAspect.class);

//    @Autowired
//    DataSourceProperties dataSourceProperties;

//    @Autowired
//    private DataSource dataSource;

    @Autowired
    private DatasourceConfig datasourceConfig;

    @Autowired
    SubTableUtilsFactory subTableUtilsFactory;

    @Autowired
    private DBService dbService;

    @Resource
    MyRoutingDataSource myRoutingDataSource;


    @Pointcut("execution(* com.springboot.mybatis.demo.mapper.common.BaseMapper.*(..))")
    public void getMybatisTableEntity() {
    }

    /**
     * 获取runtime class
     * @param joinPoint target
     * @throws ClassNotFoundException 异常
     */
    @Before("getMybatisTableEntity()")
    public void setThreadLocalMap(JoinPoint joinPoint) throws ClassNotFoundException {
        ...
        // 自动分表
        MybatisTable mybatisTable = MybatisTableUtils.getMybatisTable(Class.forName(actualTypeArguments[0].getTypeName()));
        Assert.isTrue(mybatisTable != null, "Null of the MybatisTable");
        String oldTableName = mybatisTable.getName();
        if (datasourceConfig.getSubTable().isEnable() && datasourceConfig.getSubTable().getSchemas().contains(oldTableName)) {
            ThreadLocalUtils.setSubTableName(subTableUtilsFactory.getSubTableUtil(datasourceConfig.getSubTable().getStrategy()).getTableName(oldTableName));
            // 判断是否需要分表
            dbService.autoSubTable(ThreadLocalUtils.getSubTableName(),oldTableName,datasourceConfig.getSubTable().getSchemaRoot());
        }else {
      ThreadLocalUtils.setSubTableName(oldTableName);
     }
}

如果需要分表则会通过配置的策略获取表名,然后判断数据库是否有该表,如果没有则自动创建,否则跳过

    •   创建对应分表后,则是对sql进行拦截修改,这里是定义mybatis拦截器拦截sql,如果该sql对应的实体类需要分表,则修改sql的表名,即定位到对应表进行操作

/**
 * 动态定位表
 *
 * @author liuzj
 * @date 2019-04-15
 */
@Intercepts({@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class,Integer.class})})
public class SubTableSqlHandler implements Interceptor {

    Logger logger = LoggerFactory.getLogger(SubTableSqlHandler.class);

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        StatementHandler handler = (StatementHandler)invocation.getTarget();
        BoundSql boundSql = handler.getBoundSql();
        String sql = boundSql.getSql();
        // 修改 sql
        if (SelfStringUtils.isNotEmpty(sql)) {
            MybatisTable mybatisTable = MybatisTableUtils.getMybatisTable(ThreadLocalUtils.get());
            Assert.isTrue(mybatisTable != null, "Null of the MybatisTable");
            Field sqlField = boundSql.getClass().getDeclaredField("sql");
            sqlField.setAccessible(true);
            sqlField.set(boundSql,sql.replaceAll(mybatisTable.getName(),ThreadLocalUtils.getSubTableName()));
        }
        return invocation.proceed();
    }

    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    @Override
    public void setProperties(Properties properties) {
    }
}

以上是此项目动态分表的基本思路,详细代码参见GitHub

 

未完!待续。。。如有不妥之处,请提建议和意见,谢谢

posted @ 2018-07-07 13:08  lzj123  阅读(6624)  评论(3编辑  收藏  举报