SSM整合 完美支持RESTful(Jsp和客户端<android ios...>)

一 RESTful简介

RESTful是一种网络应用程序的设计风格和开发方式 它结构清晰 符合标准 易于理解 扩展方便

REST 即Representational State Transfer的缩写 这个词组可以翻译成 表现层状态转化

通过URI定位资源(图片 文字 视频等等) 然后根据四个HTTP动词 对服务端资源进行操作 实现表现层状态转化

HTTP协议里面 四个表示操作方式的动词 GET POST PUT DELETE 分别对应四种基本操作 GET用来获取 POST用来新建 PUT用来更新 DELETE用来删除

 

二 三层架构简介

三层架构是为了符合高内聚 低耦合思想 把各个功能模块划分为表示层 业务层 持久层

开发者分工更明确 将精力更专注于应用核心业务逻辑的分析 设计和开发 加快项目的进度 提高了开发效率 有利于项目的更新和维护工作

表现层: 和客户端进行数据交互 表现层一般会采用MVC设计模型

业务层: 处理具体的业务逻辑

持久层: 操作数据库

 

三 MVC模型简介

Model View Controller 模型视图控制器

M: 数据模型(JavaBean) 用来进行数据封装

V: JSP HTML 用来展示数据给用户

C: 控制器 用来接收用户请求

 

四 SSM初体验

S: Spring

S: SpringMVC

M: MyBatis

1. 新建一个Maven项目

pom.xml

<?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>
    <groupId>com.hy.ssm</groupId>
    <artifactId>ssm-demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <!-- 定义依赖版本号 -->
    <properties>
        <junit.version>4.12</junit.version>
        <slf4j-log4j12.version>1.7.25</slf4j-log4j12.version>
        <javax.servlet-api.version>4.0.1</javax.servlet-api.version>
        <jsp-api.version>2.0</jsp-api.version>
        <jstl.version>1.2</jstl.version>
        <spring.version>5.0.5.RELEASE</spring.version>
        <jackson-databind.version>2.9.5</jackson-databind.version>
        <mysql-connector-java.version>8.0.11</mysql-connector-java.version>
        <druid.version>1.1.10</druid.version>
        <mybatis.version>3.4.6</mybatis.version>
        <mybatis-spring.version>1.3.2</mybatis-spring.version>
        <pagehelper.version>5.1.4</pagehelper.version>
    </properties>

    <!-- 管理jar版本号 -->
    <dependencyManagement>
        <dependencies>
            <!-- junit -->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit.version}</version>
            </dependency>
            <!-- slf4j -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>${slf4j-log4j12.version}</version>
            </dependency>
            <!-- servlet -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>${javax.servlet-api.version}</version>
                <scope>provided</scope>
            </dependency>
            <!-- jsp -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jsp-api</artifactId>
                <version>${jsp-api.version}</version>
                <scope>provided</scope>
            </dependency>
            <!-- jstl -->
            <dependency>
                <groupId>jstl</groupId>
                <artifactId>jstl</artifactId>
                <version>${jstl.version}</version>
            </dependency>
            <!-- spring -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jms</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context-support</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- jackson(spring mvc need) -->
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>${jackson-databind.version}</version>
            </dependency>
            <!-- mysql -->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql-connector-java.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>
            <!-- mybatis -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>${mybatis.version}</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>${mybatis-spring.version}</version>
            </dependency>
            <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper</artifactId>
                <version>${pagehelper.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
        <!-- slf4j -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
        </dependency>
        <!-- servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>
        <!-- jsp -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <scope>provided</scope>
        </dependency>
        <!-- jstl -->
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <!-- spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jms</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
        </dependency>
        <!-- jackson(spring mvc need) -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
        </dependency>
    </dependencies>

    <build>
        <!-- 允许mybatis的mapper.java和mapper.xml在同一目录 -->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>

        <plugins>
            <!-- 编译 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <!-- tomcat7 -->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <port>8081</port>
                    <path>/</path>
                    <uriEncoding>UTF-8</uriEncoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

sql

-- 用户表
CREATE TABLE user (
    id INT PRIMARY KEY AUTO_INCREMENT COMMENT '用户id',
    username VARCHAR(32) COMMENT '用户名',
    money DOUBLE COMMENT '用户余额'
);

INSERT INTO user VALUES (1, '曹操', 8000);
INSERT INTO user VALUES (2, '孙权', 8000);
INSERT INTO user VALUES (3, '刘备', 8000);
INSERT INTO user VALUES (4, '诸葛亮', 5000);
INSERT INTO user VALUES (5, '司马懿', 5000);
INSERT INTO user VALUES (6, '张飞', 0);
INSERT INTO user VALUES (7, '关羽', 0);
INSERT INTO user VALUES (8, '马超', 1000);
INSERT INTO user VALUES (9, '黄忠', 1000);
INSERT INTO user VALUES (10, '赵云', 3000);

2. 新建webapp文件夹及子文件夹和web.xml

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

    <!-- 指定Spring配置文件的位置 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:application*.xml</param-value>
    </context-param>
    <!-- 让Spring容器随项目的启动而创建 随项目的关闭而销毁 -->
    <!-- 容器创建时 会把所有单例对象都创建出来 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Jsp支持RESTful -->
    <filter>
        <filter-name>hiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>hiddenHttpMethodFilter</filter-name>
        <servlet-name>spring-mvc</servlet-name>
    </filter-mapping>

    <!-- 客户端(android ios...)支持RESTful -->
    <filter>
        <filter-name>httpPutFormContentFilter</filter-name>
        <filter-class>org.springframework.web.filter.HttpPutFormContentFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>httpPutFormContentFilter</filter-name>
        <!-- 拦截所有 -->
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 处理POST提交乱码 -->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <!-- 拦截所有 -->
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 前端控制器 -->
    <servlet>
        <servlet-name>spring-mvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:/spring-mvc.xml</param-value>
        </init-param>
        <!-- 配置SpringMVC启动时机
                1. 第一次被访问时启动 值为负数
                2. 随着容器启动而启动 值为0或正数 -->
        <load-on-startup>1</load-on-startup>
        <multipart-config>
            <!-- 文件上传大小(单位B) 5M = 5 * 1024 * 1024 -->
            <max-file-size>5242880</max-file-size>
            <!-- 文件上传请求大小(单位B) 10M = 10 * 1024 * 1024 -->
            <max-request-size>10485760</max-request-size>
        </multipart-config>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring-mvc</servlet-name>
        <!-- 拦截所有(不包含jsp 包含js png css...) -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

3. 创建jsp webapp/WEB-INF/jsp/index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

<h3>事务</h3>

${user6.toString()}<br/>
${user7.toString()}<br/>
<a href="${pageContext.request.contextPath}/test/tm">事务模拟操作</a>

<h3>分页</h3>

<a href="${pageContext.request.contextPath}/test/selectUserList">全部</a><br/>
<a href="${pageContext.request.contextPath}/test/selectUserList/1/2">第一页 每页2条</a><br/>
<a href="${pageContext.request.contextPath}/test/selectUserList/2/2">第二页 每页2条</a>

<h3>RESTful</h3>

<p>POST 普通表单</p>
<form action="${pageContext.request.contextPath}/test/insert" method="post">
    姓名 <input type="text" name="name"/><br/>
    <input type="submit" value="提交"/>
</form>

<p>POST 文件表单</p>
<form action="${pageContext.request.contextPath}/test/insertX" enctype="multipart/form-data" method="post">
    姓名 <input type="text" name="name"/><br/>
    文件 <input type="file" name="file"/><br/>
    <input type="submit" value="提交"/>
</form>

<p>DELETE 普通表单</p>
<form action="${pageContext.request.contextPath}/test/delete/1" method="post">
    <input type="hidden" name="_method" value="DELETE"/>
    姓名 <input type="text" name="name"/><br/>
    <input type="submit" value="提交"/>
</form>

<p>PUT 普通表单</p>
<form action="${pageContext.request.contextPath}/test/update/1" method="post">
    <input type="hidden" name="_method" value="PUT"/>
    姓名 <input type="text" name="name"/><br/>
    <input type="submit" value="提交"/>
</form>

<p>PUT 文件表单</p>
<form action="${pageContext.request.contextPath}/test/updateX/1" enctype="multipart/form-data" method="post">
    <input type="hidden" name="_method" value="PUT"/>
    姓名 <input type="text" name="name"/><br/>
    文件 <input type="file" name="file"/><br/>
    <input type="submit" value="提交"/>
</form>

<p>GET 普通表单</p>
<form action="${pageContext.request.contextPath}/test/select/1" method="get">
    姓名 <input type="text" name="name"/><br/>
    <input type="submit" value="提交"/>
</form>

</body>
</html>

4. 配置日志输出 resources/log4j.properties

### 输出到控制台 ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### 输出到文件 ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=//Users/HUANGYI/Downloads/x-log.txt
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### 日志级别: fatal > error > warn > info > debug > trace ###
### 输出到哪里: stdout|file ###
#log4j.rootLogger=info, stdout

### 输出所有日志 ###
log4j.rootLogger=all, stdout

### 不输出日志 ###
#log4j.rootLogger=off, stdout

5. 配置数据源 resources/druid.properties

url=jdbc:mysql://localhost:3306/demo_hy?characterEncoding=utf8&useSSL=false
driverClassName=com.mysql.cj.jdbc.Driver
username=root
password=root
maxActive=10
minIdle=5

6. 创建spring配置文件 resources/application.xml 其中管理了mybatis 无需额外创建mybatis全局配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.2.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 引入配置文件 -->
    <context:property-placeholder location="classpath:*.properties" />

    <!-- 扫描Service -->
    <context:component-scan base-package="com.hy.ssm.service" />

    <!-- 文件上传实现类 id名称必须固定 -->
    <bean id="multipartResolver" class="com.hy.ssm.resolver.PostAndPutMultipartResolver" />

    <!-- 数据库连接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
        <property name="url" value="${url}" />
        <property name="driverClassName" value="${driverClassName}" />
        <property name="username" value="${username}" />
        <property name="password" value="${password}" />
        <property name="maxActive" value="${maxActive}" />
        <property name="minIdle" value="${minIdle}" />
    </bean>

    <!-- Mybatis会话工厂 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource" />
        <!-- 别名 -->
        <property name="typeAliasesPackage" value="com.hy.ssm.model" />
        <!-- 插件 -->
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <value>
                            helperDialect=mysql
                        </value>
                    </property>
                </bean>
            </array>
        </property>
    </bean>

    <!-- Mybatis动态代理 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.hy.ssm.mapper" />
    </bean>

    <!-- 事务核心管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 事务通知 -->
    <tx:advice id="advice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- 以方法为单位 指定方法应用什么事务属性
                        isolation: 隔离级别
                        propagation: 传播行为
                        read-only: 是否只读 -->
            <tx:method name="insert*" isolation="DEFAULT" propagation="REQUIRED" read-only="false" />
            <tx:method name="delete*" isolation="DEFAULT" propagation="REQUIRED" read-only="false" />
            <tx:method name="update*" isolation="DEFAULT" propagation="REQUIRED" read-only="false" />
            <tx:method name="select*" isolation="DEFAULT" propagation="REQUIRED" read-only="true" />
        </tx:attributes>
    </tx:advice>

    <!-- 事务织入 -->
    <aop:config>
        <!-- expression(表达式): 切点表达式 -->
        <!-- * com.hy.ssm.service..*.*(..)
                * = 任意返回值
                com.hy.ssm.service. = com.hy.ssm.service包和所有子包
                .*.* = .任意类.任意方法名
                (..) = 任意参数 -->
        <aop:pointcut id="pointcut" expression="execution(* com.hy.ssm.service..*.*(..))" />
        <aop:advisor pointcut-ref="pointcut" advice-ref="advice" />
    </aop:config>
</beans>

7. 创建springmvc配置文件 resources/spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.2.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">

    <!-- 扫描Controller -->
    <context:component-scan base-package="com.hy.ssm.controller" />

    <!-- 注解驱动 -->
    <mvc:annotation-driven />

    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 逻辑视图前缀 -->
        <property name="prefix" value="/WEB-INF/jsp" />
        <!-- 逻辑视图后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 加载静态资源 -->
    <mvc:default-servlet-handler />
</beans>

8. 自定义文件上传实现类 com.hy.ssm.resolver.PostAndPutMultipartResolver 解决客户端(android ios...) PUT提交文件表单异常

public class PostAndPutMultipartResolver extends StandardServletMultipartResolver {

    @Override
    public boolean isMultipart(HttpServletRequest request) {
        if ("POST".equalsIgnoreCase(request.getMethod()) || "PUT".equalsIgnoreCase(request.getMethod())) {
            return StringUtils.startsWithIgnoreCase(request.getContentType(), "multipart/");
        }
        return false;
    }
}

9. 创建实体类 com.hy.ssm.model.User com.hy.ssm.model.PageWrapper

public class User implements Serializable {

    private Integer id;
    private String username;
    private Double money;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

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

    public Double getMoney() {
        return money;
    }

    public void setMoney(Double money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", money=" + money +
                '}';
    }
}

public class PageWrapper implements Serializable {

    private Long total;
    private List list;

    public PageWrapper() {}

    public PageWrapper(Long total, List list) {
        this.total = total;
        this.list = list;
    }

    public Long getTotal() {
        return total;
    }

    public void setTotal(Long total) {
        this.total = total;
    }

    public List getList() {
        return list;
    }

    public void setList(List list) {
        this.list = list;
    }
}

10. 创建mapper接口 com.hy.ssm.mapper.UserMapper

public interface UserMapper {

    User selectUserById(Integer id);

    List<User> selectUserList();

    Integer updateUserMoney(Map map);
}

11. 创建mapper映射文件 com.hy.ssm.mapper.UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.hy.ssm.mapper.UserMapper">
    <select id="selectUserById" parameterType="Integer" resultType="User">
        SELECT *
        FROM user
        WHERE id = #{value}
    </select>

    <select id="selectUserList" resultType="User">
        SELECT *
        FROM user
    </select>

    <update id="updateUserMoney" parameterType="HashMap">
        UPDATE user
        SET money = money + #{money}
        WHERE id = #{id}
    </update>
</mapper>

12. 创建service接口 com.hy.ssm.service.IUserService

public interface IUserService {

    User selectUserById(Integer id);

    List<User> selectUserList();

    PageWrapper selectUserList(Integer pageNum, Integer pageSize);

    Boolean updateUserMoney(Map map1, Map map2);
}

13. 创建service实现类 com.hy.ssm.service.imp.UserService

@Service
public class UserService implements IUserService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public User selectUserById(Integer id) {
        return userMapper.selectUserById(id);
    }

    @Override
    public List<User> selectUserList() {
        return userMapper.selectUserList();
    }

    @Override
    public PageWrapper selectUserList(Integer pageNum, Integer pageSize) {
        PageHelper.startPage(pageNum, pageSize);
        List<User> userList = userMapper.selectUserList();
        PageInfo<User> pageInfo = new PageInfo<>(userList);
        return new PageWrapper(pageInfo.getTotal(), userList);
    }

    @Override
    public Boolean updateUserMoney(Map map1, Map map2) {
        Integer integer1 = userMapper.updateUserMoney(map1);
        int i = 3 / 0; //模拟异常
        Integer integer2 = userMapper.updateUserMoney(map2);
        return 0 != integer1 && 0 != integer2;
    }
}

14. 创建控制器 com.hy.ssm.controller.TestController

@Controller
@RequestMapping("/test")
public class TestController {

    @Autowired
    private IUserService userService;

    @RequestMapping("/index")
    public String index(Model model) {
        User user6 = userService.selectUserById(6);
        User user7 = userService.selectUserById(7);
        model.addAttribute("user6", user6);
        model.addAttribute("user7", user7);
        return "/index";
    }

    @RequestMapping("/tm")
    public String tm() {
        Map<String, Object> map1 = new HashMap<>();
        map1.put("id", 6);
        map1.put("money", -1000.0);
        Map<String, Object> map2 = new HashMap<>();
        map2.put("id", 7);
        map2.put("money", +1000.0);
        userService.updateUserMoney(map1, map2);
        return "redirect:index";
    }

    @RequestMapping("/selectUserList")
    @ResponseBody
    public List<User> selectUserList() {
        return userService.selectUserList();
    }

    @GetMapping("/selectUserList/{page}/{size}")
    @ResponseBody
    public PageWrapper selectUserList(@PathVariable Integer page, @PathVariable Integer size) {
        return userService.selectUserList(page, size);
    }

    /** RESTful 只进行演示 没有做数据持久化 同时支持Jsp 客户端(android ios...) **/

    @PostMapping("/insert")
    @ResponseBody
    public Map insert(String name) {
        Map<String, Object> map = new HashMap<>();
        map.put("name", name);
        return map;
    }

    @PostMapping("/insertX")
    @ResponseBody
    public Map insertX(HttpServletRequest request, String name, MultipartFile file) throws Exception {
        Map<String, Object> map = new HashMap<>();
        map.put("name", name);
        map.put("path", saveFile(request, file));
        return map;
    }

    @DeleteMapping("/delete/{id}")
    @ResponseBody
    public Map delete(@PathVariable Integer id, String name) {
        Map<String, Object> map = new HashMap<>();
        map.put("id", id);
        map.put("name", name);
        return map;
    }

    @PutMapping("/update/{id}")
    @ResponseBody
    public Map update(@PathVariable Integer id, String name) {
        Map<String, Object> map = new HashMap<>();
        map.put("id", id);
        map.put("name", name);
        return map;
    }

    @PutMapping("/updateX/{id}")
    @ResponseBody
    public Map updateX(@PathVariable Integer id, HttpServletRequest request, String name, MultipartFile file) throws Exception {
        Map<String, Object> map = new HashMap<>();
        map.put("id", id);
        map.put("name", name);
        map.put("path", saveFile(request, file));
        return map;
    }

    @GetMapping("/select/{id}")
    @ResponseBody
    public Map select(@PathVariable Integer id, String name) {
        Map<String, Object> map = new HashMap<>();
        map.put("id", id);
        map.put("name", name);
        return map;
    }

    private String saveFile(HttpServletRequest request, MultipartFile file) throws Exception {
        if (null != file && !file.isEmpty()) {
            String fileName = UUID.randomUUID().toString().replace("-", ""); //文件名
            String originalFilename = file.getOriginalFilename();
            String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
            String path = request.getServletContext().getRealPath("/upload") + "/" + fileName + substring;
            file.transferTo(new File(path));
            return path;
        }
        return "";
    }
}

启动项目 访问 http://localhost:8081/test/index

android客户端核心代码

public interface Api {

    @POST("/test/insert")
    @FormUrlEncoded
    Call<ResponseBody> insert(@Field("name") String name);

    @POST("/test/insertX")
    @Multipart
    Call<ResponseBody> insertX(@Part MultipartBody.Part name, @Part MultipartBody.Part file);

    @DELETE("/test/delete/{id}")
    Call<ResponseBody> delete(@Path("id") Integer id, @Query("name") String name);

    @PUT("/test/update/{id}")
    @FormUrlEncoded
    Call<ResponseBody> update(@Path("id") Integer id, @Field("name") String name);

    @PUT("/test/updateX/{id}")
    @Multipart
    Call<ResponseBody> updateX(@Path("id") Integer id, @Part MultipartBody.Part name, @Part MultipartBody.Part file);

    @GET("/test/select/{id}")
    Call<ResponseBody> select(@Path("id") Integer id, @Query("name") String name);
}

private void insert() {
    Call<ResponseBody> call = mApi.insert("祎哥哥");
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {}

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {}
    });
}

private void insertX() {
    MultipartBody.Part name = MultipartBody.Part.createFormData("name", "祎哥哥");
    RequestBody body = RequestBody.create(MediaType.parse("application/octet-stream"), card("text.txt"));
    MultipartBody.Part file = MultipartBody.Part.createFormData("file", "text.txt", body);
    Call<ResponseBody> call = mApi.insertX(name, file);
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {}

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {}
    });
}

private void delete() {
    Call<ResponseBody> call = mApi.delete(3, "黄祎");
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {}

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {}
    });
}

private void update() {
    Call<ResponseBody> call = mApi.update(3, "黄祎");
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {}

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {}
    });
}

private void updateX() {
    MultipartBody.Part name = MultipartBody.Part.createFormData("name", "黄祎");
    RequestBody body = RequestBody.create(MediaType.parse("application/octet-stream"), card("text.txt"));
    MultipartBody.Part file = MultipartBody.Part.createFormData("file", "text.txt", body);
    Call<ResponseBody> call = mApi.updateX(3, name, file);
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {}

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {}
    });
}

private void select() {
    Call<ResponseBody> call = mApi.select(3, "黄祎");
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {}

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {}
    });
}

 

五 通过注解管理事务

初体验项目中是使用申明式事务管理 还可以使用注解式事务管理 2种事务管理方式都很常见 任选其中一种即可

1. 修改resources/application.xml 将下面配置拷贝进去 替换掉 事务通知 事务织入

<!-- 事务注解 -->
<tx:annotation-driven />

2. 在com.hy.ssm.service.imp.UserService上添加注解

@Transactional(isolation = Isolation.DEFAULT, propagation = Propagation.REQUIRED, readOnly = false)