框架四：SSM框架的整合

SSM（Spring+SpringMVC+MyBatis）框架集由Spring、MyBatis两个开源框架整合而成（SpringMVC是Spring中的部分内容）。
Spring
　　Spring就像是整个项目中装配bean的大工厂，在配置文件中可以指定使用特定的参数去调用实体类的构造方法来实例化对象。
　　Spring的核心思想是IoC（控制反转），即不再需要程序员去显式地new一个对象，而是让Spring框架帮你来完成这一切。
　　SpringMVC
　　SpringMVC在项目中拦截用户请求，它的核心Servlet即DispatcherServlet承担中介或是前台这样的职责，将用户请求通过HandlerMapping去匹配Controller，Controller就是具体对应请求所执行的操作。SpringMVC相当于SSH框架中struts。
　　mybatis
　　mybatis是对jdbc的封装，它让数据库底层操作变的透明。mybatis的操作都是围绕一个sqlSessionFactory实例展开的。mybatis通过配置文件关联到各实体类的Mapper文件，Mapper文件中配置了每个类对数据库所需进行的sql语句映射。在每次与数据库交互时，通过sqlSessionFactory拿到一个sqlSession，再执行sql命令。
页面发送请求给控制器，控制器调用业务层处理逻辑，逻辑层向持久层发送请求，持久层与数据库交互，后将结果返回给业务层，业务层将处理逻辑发送给控制器，控制器再调用视图展现数据。 （百度百科）

SSM的搭建 Demo

1.maven 下建立web文件
2.如果maven有错误–对maven进行配置
(1)修改jdk （2）project Facet （3）检查目录结构
3.导入jar包—Spring SpringMVC Mybatis

Spring

	<!-- springcontext -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<!-- springcore -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<!--spring-beans -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<!-- commons-logging -->
		<dependency>
			<groupId>commons-logging</groupId>
			<artifactId>commons-logging</artifactId>
			<version>1.2</version>
		</dependency>
		<!-- spring-aop -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aop</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<!--spring-aspects -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<!--spring-expression -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-expression</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<!--aspectjweaver -->
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>1.8.9</version>
		</dependency>
		<dependency>
			<groupId>aopalliance</groupId>
			<artifactId>aopalliance</artifactId>
			<version>1.0</version>
		</dependency>
		<!--springjdbc -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<!-- mysql-connector-java -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.38</version>
		</dependency>

SpringMVC

<!-- spring-webmvc -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<!—-ajax有关  jackson-databind -->
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.9.5</version>
		</dependency>

		<!—-servlet有关  javax.servlet-api -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.1.0</version>
			<scope>provided</scope>
		</dependency>
		<!--jstl -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>

Mybatis

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.38</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.4.5</version>
		</dependency>
		<!—整合需要mybatis-spring -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.3.1</version>
		</dependency>
		<!—日志需要log4j -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>

<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-dbcp2</artifactId>
			<version>2.1.1</version>
		</dependency>

4.配置文件
application，Springmvc，mybatis-config

applicationcontext

<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
		<!-- 扫描 -->
		<context:component-scan base-package="com.qst.service"/>
		<context:component-scan base-package="com.qst.dao"/>
		<aop:aspectj-autoproxy proxy-target-class="true"/>
		<!-- 配置数据源 -->
		<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
			<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
			<property name="url" value="jdbc:mysql://localhost:3306/jdbc?characterEncoding=utf8"></property>
			<property name="username" value="root"></property>
			<property name="password" value="orcl"></property>
		</bean>
		<!--2创建一个sql会话工厂，sqlsessionfactory-->
		<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
			<property name="dataSource" ref="dataSource"></property><!-- 指定数据源 -->
			<property name="configLocation" value="classpath:mybatis-config.xml"></property><!-- 指定配置文件 -->
		</bean>
		<!-- 配置事务管理器，依赖与数据源 -->
		<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
			<property name="dataSource" ref="dataSource"></property>
		</bean>
				<!-- 开启事务注解 -->
		<tx:annotation-driven transaction-manager="txManager"/>
				 <!--3配置Mapper扫描器-->
    	<bean  class="org.mybatis.spring.mapper.MapperScannerConfigurer">
       		 	<!--指定映射文件 -->
        <property name="basePackage" value="com.qst.dao"></property>
        		<!-- 指定sql会话工厂-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
      </bean>
	</beans>

springmvc

<?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:mvc="http://www.springframework.org/schema/mvc"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
	http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
	http://www.springframework.org/schema/mvc 
	http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
	http://www.springframework.org/schema/context 
	http://www.springframework.org/schema/context/spring-context-4.3.xsd">
	<context:component-scan base-package="com.qst.controller"></context:component-scan>
	<mvc:annotation-driven />
	<!-- Spring MVC不处理静态资源 -->
	<mvc:default-servlet-handler />
	<mvc:resources location="/css/" mapping="/css/**"></mvc:resources>
	<mvc:resources location="/js/" mapping="/js/**"></mvc:resources>
	<mvc:resources location="/images/" mapping="/images/**"></mvc:resources>
	<!-- 配置视图解析器 -->
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
</beans>

mybatis-config,注意名字

<?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>
		使用自动扫描包来定义别名，别名为类名
		<package name="com.qst.po" />
</typeAliases> -->
<!-- 配置映射文件Mapper的位置 -->
<mappers>
<mapper resource="com/qst/dao/UserMapper.xml" />
</mappers>
</configuration>

5.配置web.xml
需要有 加载spring的配置文件，servlet 与 过滤器（最好有）

<!-- 加载spring的配置文件 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationcontext.xml</param-value>
	</context-param>
	<listener>
	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>


	<servlet>
		<servlet-name>springmvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:springmvc.xml</param-value>   需要更改
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>springmvc</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

	<filter>
		<filter-name>SetCharacterEncoding</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>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>SetCharacterEncoding</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

6.测试 使用注解
建立和表相映射的类
usermapper @mapper
controller @controller 使用@resouce注入service
service @service 使用@resource 注入usermapper

7.结构

未完待续！