简单易学的SSM（Spring+SpringMVC+MyBatis）整合
SSM（Spring+SpringMVC+MyBatis）的整合：
具体执行过程： 1.用户在页面向后台发送一个请求
2.请求由DispatcherServlet 前端控制器拦截交给SpringMVC管理，SpringMVC讲这个请求传递给Controller层处理。
同时请求由Listener监听到交付给Spring，Spring建立IOC容器。
3.Controller层中会调用相应的Service层的方法处理业务逻辑。此时Service从上一步中建立好的IOC容器获取对象，然后获取
到Mapper接口中的代理类对象调用接口中的方法。
4.这个方法在对应的SQL映射文件mapper.xml中执行SQL语句，与数据库交互，获取到结果后返回给Service中的这个方法，
然后返回给Controller，再跳转到JSP页面显示给用户。
总结：SpringMVC 与前台页面交互
Spring 处理业务逻辑
MyBatis 与数据库打交道
从下面的配置中不难发现： SpringMVC的底层是由Listener实现的
Spring本质是一个Servler
这有助于大家理解SSM
SSM配置：
建立动态WEB项目，导入相应JAR包：
然后在web.xml中配置Spring和SpringMVC：
<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>Spring-SpringMVC-MyBatis</display-name> <!-- 配置Spring --> <!--配置Listener监听浏览器发过来的请求 并动态创建IOC容器--> <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> <!-- 配置SpringMVC --> <!-- 配置前端控制器，拦截相应的请求 --> <servlet> <servlet-name>springDispatcherServlet</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> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springDispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- 配置过滤器来处理post乱码问题 --> <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> <!-- 浏览器form表单只支持GET与POST请求，而DELETE、PUT等method并不支持，所以添加过滤器转化 --> <!-- 配置过滤器来将PUT请求转化为PUT DELETE请求 --> <filter> <filter-name>HiddenHttpMethodFilter</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>HiddenHttpMethodFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 默认的访问文件 --> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app>
对应的编辑SpringMVC的配置文件 springmvc.xml（注意这个xml的类型是 Spring Bean Configuration File）
<?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:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"> <!-- 配置扫描包，使SpringMVC只扫描Controller层 --> <context:component-scan base-package="com.neuedu" use-default-filters="false"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/> </context:component-scan> <!-- 配置视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/views/"></property> <property name="suffix" value=".jsp"></property> </bean> <!-- 可以处理静态资源 --> <mvc:default-servlet-handler /> <!-- 标配，功能强大，诸多用处。例如使处理静态资源后RequestMapping继续能够使用等功能 --> <mvc:annotation-driven></mvc:annotation-driven> </beans>
对应配置Spring的配置文件 spring.xml 文件类型同上，不过我们通常命名为applicationContext.xml 蕴含整个项目之意
<?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: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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"> <!-- 扫描相关除去Controller的包 --> <context:component-scan base-package="com.neuedu" > <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/> <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/> </context:component-scan> <!-- 加载外部属性文件 --> <context:property-placeholder location="classpath:jdbc.properties" /> <!-- 配置c3p0数据源 --> <bean id="comboPooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${jdbc.username}"></property> <property name="password" value="${jdbc.password}"></property> <property name="driverClass" value="${jdbc.driver}"></property> <property name="jdbcUrl" value="${jdbc.url}"></property> </bean> <!-- 配置事务管理 --> <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="comboPooledDataSource"></property> </bean> <!-- 开启基于注解的声明式事务 --> <tx:annotation-driven transaction-manager="dataSourceTransactionManager"/> <!-- Spring与MyBatis整合 --> <!-- 配置SqlSession工厂 --> <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="comboPooledDataSource"></property> <property name="configLocation" value="classpath:mybatis-config.xml" ></property> </bean> <!-- 扫描Mapper包 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.neuedu.mapper"></property> </bean> </beans>
这里有个jdbc.properties外部文件 连接数据库使用，读者视情况修改
jdbc.username:root jdbc.password:123456 jdbc.driver:com.mysql.jdbc.Driver jdbc.url:jdbc:mysql://localhost:3306/studentmanage
对应配置MyBatis的配置文件 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> <properties resource="jdbc.properties"></properties> <settings> <!-- 驼峰式命名 --> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> </configuration>
如果想要在控制台打印日志 可添加log4j.xml 这个文件固定，请读者自行按需添加，在此不做赘述。
至此，配置完毕。然后在src下建立相应的包即可，一般来说
bean 通用实体类 ------------------------------------------- 与数据库表对应的类
mapper 存放mapper接口和对应的.xml 文件 ------------------------------------------ 由MyBatis 管理
service 处理业务逻辑 ------------------------------------------- 由Spring管理
controller 与前端进行交互 -------------------------------------------- 由SpringMVC管理
好，废话不多说，开始项目（以一个简单的显示学生列表的方式展示SSM）
建数据库:
在bean包中建立Stu.java
在mapper包中建立接口StuMapper.java 和对应的StuMapper.xml SQL映射文件
在sevice包的StuServce.java 中调用接口中的方法
在controller中StuController 中调用Service层的方法 然后讲结果返回给JSP页面显示
具体代码如下：
Stu.java: package com.neuedu.bean; public class Stu { private int ID; private String UserName; private String PassWord; public Stu() { super(); } public Stu(int iD, String userName, String passWord) { super(); ID = iD; UserName = userName; PassWord = passWord; } public Stu(String userName, String passWord) { super(); UserName = userName; PassWord = passWord; } public int getID() { return ID; } public void setID(int iD) { ID = iD; } public String getUserName() { return UserName; } public void setUserName(String userName) { UserName = userName; } public String getPassWord() { return PassWord; } public void setPassWord(String passWord) { PassWord = passWord; } @Override public String toString() { return "Stu [ID=" + ID + ", UserName=" + UserName + ", PassWord=" + PassWord + "]"; } } StuMapper.java: package com.neuedu.mapper; import java.util.List; import com.neuedu.bean.Stu; public interface StuMapper { public List<Stu> getStuList(); } StuMapper.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.neuedu.mapper.StuMapper"> <select id="getStuList" resultType="com.neuedu.bean.Stu"> select * from stu </select> </mapper> StuService.java: package com.neuedu.service; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.neuedu.bean.Stu; import com.neuedu.mapper.StuMapper; @Service public class StudentService { @Autowired private StuMapper mapper; public List<Stu> getStuList() { return mapper.getStuList(); } } StuController.java: package com.neuedu.controller; import java.util.List; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import com.neuedu.bean.Stu; import com.neuedu.service.StudentService; @Controller public class StuController { @Autowired private StudentService studentService; @RequestMapping(value="/getStuList") public String getStuList(Map<String,Object> map){ List<Stu> list=studentService.getStuList(); map.put("stulist", list); return "StudentList"; } } StudentList.jsp: <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.min.js"></script> <title>学生信息展示</title> </head> <body> <h1 align="center">学生信息</h1> <div align="center"> <form action="${pageContext.request.contextPath}/queryStu" method="post"> <input type="text" name="queryname" placeholder="请输入将要查找的姓名" > <input type="submit" value="查询"/> </form> </div> <table border="1" align="center" width="50%"> <tr> <th>姓名</th> <th>密码</th> <th colspan="2">操作</th> </tr> <c:forEach items="${stulist}" var="stu"> <tr> <td>${stu.userName}</td> <td>${stu.passWord}</td> <td><a href="${pageContext.request.contextPath}/deleteStu?id=${stu.ID}">删除</a></td> <td><a href="${pageContext.request.contextPath}/toUpdateStu?id=${stu.ID}">修改</a></td> </tr> </c:forEach> <tr> <td colspan="5" align="center" ><a href="${pageContext.request.contextPath}/toAddStu">添加</a> </td> </tr> </table> <br/> </body> </html>
页面显示：
第一次写这么多，有什么错误的地方欢迎批评指正！
