ssm框架整合思路及代码

1、Dao层：

mybatis整合spring，通过spring创建数据库连接池，管理SqlSessionFactory、mapper代理对象。需要mybatis和spring的整合包

创建SqlMapConfig.xml配置文件
<?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>

</configuration>
创建applicationContext-dao.xml
<beansxmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd http://www.springframework.org/schema/utilhttp://www.springframework.org/schema/util/spring-util-4.2.xsd">
<!-- 数据库连接池 -->
<!-- 加载配置文件 -->
<context:property-placeholderlocation="classpath:properties/*.properties"/>
<!-- 数据库连接池 -->
<bean id="dataSource"class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close">
<property name="url"value="${jdbc.url}"/>
<property name="username"value="${jdbc.username}"/>
<property name="password"value="${jdbc.password}"/>
<property name="driverClassName"value="${jdbc.driver}"/>
<property name="maxActive"value="10"/>
<property name="minIdle"value="5"/>
</bean>
<!-- 让spring管理sqlsessionfactory 使用mybatis和spring整合包中的 -->
<bean id="sqlSessionFactory"class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 数据库连接池 -->
<property name="dataSource"ref="dataSource"/>
<!-- 加载mybatis的全局配置文件 -->
<property name="configLocation"value="classpath:mybatis/SqlMapConfig.xml"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage"value="mapper代理对象所在包的全路径"/>
</bean>
</beans>
为了便于更改数据库，编写db.properties文件
jdbc.driver=数据库驱动
jdbc.url=jdbc:mysql://localhost:3306/数据库名称?characterEncoding=utf-8
jdbc.username=用户名
jdbc.password=密码

2、Service层：所有的service实现类都放到spring容器中管理。由spring管理实务。
创建applicationContext-service.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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-4.2.xsd http://www.springframework.org/schema/utilhttp://www.springframework.org/schema/util/spring-util-4.2.xsd">

<context:component-scanbase-package="实现类所在的包的全路径 "></context:component-scan>
</beans>
创建applicationContext-trans.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd http://www.springframework.org/schema/utilhttp://www.springframework.org/schema/util/spring-util-4.2.xsd"> <!-- 事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 数据源 -->
<property name="dataSource"ref="dataSource"/>
</bean>
<!-- 通知 -->
<tx:advice id="txAdvice"transaction-manager="transactionManager">
<tx:attributes>
<!-- 传播行为 -->
<tx:method name="save*"propagation="REQUIRED"/>
<tx:method name="insert*"propagation="REQUIRED"/>
<tx:method name="add*"propagation="REQUIRED"/>
<tx:method name="create*"propagation="REQUIRED"/>
<tx:method name="delete*"propagation="REQUIRED"/>
<tx:method name="update*"propagation="REQUIRED"/>
<tx:method name="find*"propagation="SUPPORTS"read-only="true"/>
<tx:method name="select*"propagation="SUPPORTS"read-only="true"/>
<tx:method name="get*"propagation="SUPPORTS"read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- 切面 -->
<aop:config>
<aop:advisoradvice-ref="txAdvice"
pointcut="切入点表达式" />
</aop:config>
</beans>

为了加载spring容器，在Web.Xml中编写如下
<?xml version="1.0"encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>名字</display-name>
<!-- 加载spring容器 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/applicationContext*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>

3、表现层：Springmvc框架，由springmvc管理controller

创建Springmvc.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"xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.2.xsd">

<context:component-scanbase-package="com.taotao.controller"/>
<mvc:annotation-driven/>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix"value="/WEB-INF/jsp/"/>
<property name="suffix"value=".jsp"/>
</bean>
</beans>
为了加载前端控制器（DispatcherServlet），在web.xml中编写如下
<?xml version="1.0"encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>名字</display-name>
<welcome-file-list>
<welcome-file>欢迎页</welcome-file>
</welcome-file-list>
<!-- 解决post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>
<url-pattern>/*</url-pattern>
</filter-mapping>

<!-- springmvc的前端控制器 -->
<servlet>
<servlet-name>名字</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- contextConfigLocation不是必须的， 如果不配置contextConfigLocation， springmvc的配置文件默认在：WEB-INF/servlet的name+"-servlet.xml"-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>名字（与上面的名字保持一致即可）</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>