SSM框架整合搭建流程
刚学完Mybatis，Spring，SpringMVC
尝试进行一个整合开发，记录一下搭建流程
1.环境与开发工具
IDEA
MySQL 8.0.16
Tomcat 9.0.21
Maven 3.6.1
2.项目准备
1.创建一个maven工程
2.依赖注入
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.16</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.2.1</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.2</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.2</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.8.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.8.RELEASE</version> </dependency> </dependencies>
3.配置静态资源导出
<build> <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> </build>
4.连接数据库
这里可能连接失败报错[08001] Could not create connection to database server. Attempted reconnect 3 times. Giving up.
是因为系统默认的时区与IDEA连接数据库的时区 (MySQL默认时区为UTC) 不一致
按照格林威治的时间，我们属于东八区时间，领先UTC八个小时，所以说存在8小时的时差，需要修改
MySQL 8.0以上才存在此问题，如使用的是MySQL 5.7可以忽略
3.编写配置文件
1.applicationContext.xml
<?xml version="1.0" encoding="UTF-8" ?> <beans xmlns="http://www.springframework.org/schema/beans" 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.xsd"> <import resource="classpath:spring-dao.xml"/> <import resource="classpath:spring-service.xml"/> <import resource="classpath:spring-mvc.xml"/> </beans>
2.mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <typeAliases> <package name="xxx.pojo"/> </typeAliases> <mappers> <mapper class="xxx.dao.xxxMapper"/> </mappers> </configuration>
3.database.properties
4.编写Mybatis层
1.与数据表对应的简单实体类(pojo)
2.与各实体类对应的Mapper接口(dao)
3.各接口的实现类(service)
5.Spring整合dao层
1.关联数据库配置文件(database.properties)
<context:property-placeholder location="classpath:database.properties"/>
2.连接池
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driver" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean>
这里使用的是Druid，也可以使用c3p0、dbcp等
3.sqlSessionFactory
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:mybatis-config.xml"/> </bean>
4.配置dao接口扫描包，动态实现dao接口注入到Spring容器
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <property name="basePackage" value="com.initial.dao"/> </bean>
6.Spring整合Service层
1.扫描service下的包
<context:component-scan base-package="com.initial.service"/>
2.将业务类注入Spring(可注解实现)
3.声明式事务配置
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean>
7.整合SpringMVC
1.给maven项目增加web支持
2.在web.xml配置DispathcherServlet
<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:applicationContext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring-mvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
3.配置乱码过滤
<filter> <filter-name>encodingFilter</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>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
注意：/和/*的区别，前者不会扫描.jsp文件，后者会。所以过滤器这里需要写/*，而DispathcherServlet核心分发器是/。
4.设置session过期时间
<session-config> <session-timeout>15</session-timeout> </session-config>
5.配置spring-mvc.xml(处理器映射器、处理器适配器、视图解析器)
其中，处理器映射器和处理器适配器在使用了注解驱动的情况下可以省略
<!--注解驱动--> <mvc:annotation-driven/> <!--静态资源过滤--> <mvc:default-servlet-handler/> <!--扫描controller--> <context:component-scan base-package="com.initial.controller"/> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean>
