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这段时间上一个项目刚做完，下一个项目还没开始，趁这个时候来认真总结一下上个项目使用的ssm开发框架。由于，项目中关于使用ssm这部分的代码和配置是我们项目的整体架构师一个独立完成的，我们只负责业务部分的代码，调用他写好的后台，所以涉及到ssm具体使用的我都没参与，之前简单的做过s（struts）sh，对于ssm不是很熟悉，所以，这段时间从头到尾独立搭建一个ssm框架的web应用。
首先，spring、springmvc、mybatis所需要的jar包准备好，导入到新建web项目的lib中，然后开始搭建java源代码（src）下的结构，我在这里用到的是类似ssh的结构mapper.java、mapper.xml、dao、daoImpl、service、serviceImpl、controller。项目目录结构如下。
接下来，写配置文件。
web.xml
<?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/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>SSM</display-name>
<!-- spring配置文件加载 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:resources/spring-config.xml</param-value>
</context-param>
<!-- Spring ApplicationContext 载入 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- mvc控制器 -->
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:resources/mvc-config.xml
</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<!-- 默认显示的首页面 -->
<welcome-file-list>
<welcome-file>login.html</welcome-file>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>
-----------------------------------------------spring.xml--------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
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
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
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 扫描DAO和SERVICE包，controller包在springmvc中扫描 -->
<context:component-scan base-package="com.liusk.serviceImpl,com.liusk.daoImpl" />
<!-- 数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8"></property>
<property name="user" value="root"></property>
<property name="password" value="java"></property>
<property name="minPoolSize" value="5"></property>
<property name="maxPoolSize" value="100"></property>
</bean>
<!-- 会话工厂 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation" value="classpath:resources/mybatis-config.xml"></property>
<property name="mapperLocations" value="classpath:com/liusk/mapper/*.xml"></property>
</bean>
<!-- 事务处理 -->
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<tx:advice id="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="insert*" propagation="REQUIRED"></tx:method>
<tx:method name="delete*" propagation="REQUIRED"></tx:method>
<tx:method name="update*" propagation="REQUIRED"></tx:method>
<tx:method name="select*" propagation="SUPPORTS"></tx:method>
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut id="serviceCut" expression="execution(public * com.liusk.service.*.*(..))" />
<aop:advisor pointcut-ref="serviceCut" advice-ref="txAdvice" />
</aop:config>
<!-- spring和mybatis的整合 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.liusk.mapper"/>
</bean>
</beans>
关于spring和mybatis整合的方法有很多种，上面xml中是最基础的配置，还可以加入其它的限制条件，这个可以单独到百度上搜更详细的解释。
-------------------------------------------------------mvc-config.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:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- 扫描controller包 -->
<context:component-scan base-package="com.liusk.controller"></context:component-scan>
<!-- 完成请求和注解POJO的映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
<!-- 页面转向解析 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 支持文件上传 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
</bean>
</beans>
在mvcconfig中，最重要的工作是控制转发，这个配置文件中做了最简单的转发操作，只能转发页面，如果想要通过ajax实现转发数据，那么需要重写ViewResolver来实现这个功能。
--------------------------------------------------------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>
<!-- 定义别名 -->
<typeAliases>
<typeAlias type="com.liusk.entity.User" alias="User"/>
</typeAliases>
</configuration>
至此，配置文件部分完毕。
下面是src源码
----------------------------------------------------------User.java------------------------------------------------------
package com.liusk.entity;
public class User {
private String userId;
private String username;
private String password;
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
mybatis的实体类和hibernate实体类的不同是mybatis的实体类不需要加载到spring的beanFactory中，而是通过操作数据库的mapper来持久化数据。
-----------------------------------------------------------UserMapper.java------------------------------------------
package com.liusk.mapper;
import java.util.List;
import com.liusk.entity.User;
public interface UserMapper {
public List<User> selectUser(User user);
public void insertUser(User user);
public List<User> selectUserByUserName(String username);
}
UserMapper.java这个文件是在何时被加载到spring中的呢？我们知道它是在daoImpl中使用到的，而且是注解到daoImpl中的，所以它一定在之前已经被加载到beanFactory中了，我在第一次配置的时候也不是太清楚它是什么时候进入beanFactory因为它身上没有任何注解，所以，根据spring配置文件中spring和mybatis的整合，推测UserMapper.java就是在
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.liusk.mapper"/></bean>
这个地方被加载的。这个下面有详细解答。
----------------------------------------------------------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.liusk.mapper.UserMapper">
<resultMap type="com.liusk.entity.User" id="userMap">
<id column="user_id" property="userId" ></id>
<result column="user_name" property="username"/>
<result column="password" property="password"/>
</resultMap>
<select id="selectUser" parameterType="User" resultType="java.util.List" resultMap="userMap">
select * from user where user_name = #{username} and password = #{password}
</select>
<select id="selectUserByUserName" parameterType="java.lang.String" resultType="java.util.List" resultMap="userMap">
select * from user where user_name = #{username}
</select>
<insert id="insertUser" parameterType="User">
insert into user values (#{userId},#{username},#{password})
</insert>
</mapper>
该配置文件中namespace对应接口的路径，也就是mapper.java的路径，否则抛出异常。所以这里牵涉到一个问题：UserMapper.java到底是何时加载到beanFactory的？为什么会用这个问题呢，应为UserMapper.xml在spring的sessionFactory初始化的时候被扫描并加载到spring，那么这个时候会不会根据这个命名空间同时把UserMapper.java加载到beanFactory中呢，其实我没有看过spring和mybatis的源码，所以不太了解。根据猜测和验证，UserMapper.java不是在这个时候被加载的。
------------------------------------------------------UserDAO--------------------------------------------
package com.liusk.dao;
import java.util.List;
import com.liusk.entity.User;
public interface UserDAO {
public List<User> selectUser(User user);
public void insertUser(User user);
public List<User> selectUserByUserName(String username);
}
这个UserDAO的存在就是在向我的第一个项目使用ssh致敬的，其实这个UserDAO他就是个接口，可以不存在，下面的UserService也是这个道理。
------------------------------------------------------UserDAOImpl----------------------------------------
package com.liusk.daoImpl;
import java.util.List;
import org.safehaus.uuid.UUIDGenerator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.liusk.dao.UserDAO;
import com.liusk.entity.User;
import com.liusk.mapper.UserMapper;
@Repository
public class UserDAOImpl implements UserDAO {
@Autowired
private UserMapper userMapper;
private UUIDGenerator uuidGen = UUIDGenerator.getInstance();
@Override
public List<User> selectUser(User user) {
return userMapper.selectUser(user);
}
@Override
public void insertUser(User user) {
String userId = uuidGen.generateTimeBasedUUID().toString();
if(user.getUserId()==null||user.getUserId()=="")
user.setUserId(userId.replace("-", ""));
System.out.println(user.getUserId());
userMapper.insertUser(user);
}
@Override
public List<User> selectUserByUserName(String username) {
return userMapper.selectUserByUserName(username);
}
}
UserDAOImpl和UserServiceImpl类似，都是实现类，做具体的数据持久化操作。
--------------------------------------------------------UserService-----------------------------------------
package com.liusk.service;
import java.util.List;
import com.liusk.entity.User;
public interface UserService {
public void insertUser(User user);
public List<User> selectUser(User user);
public boolean existUser(String username);
}
--------------------------------------------------------UserServiceImpl--------------------------------------
package com.liusk.serviceImpl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.liusk.dao.UserDAO;
import com.liusk.entity.User;
import com.liusk.service.UserService;
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserDAO userDAO;
@Override
public void insertUser(User user) {
userDAO.insertUser(user);
}
@Override
public List<User> selectUser(User user) {
return userDAO.selectUser(user);
}
@Override
public boolean existUser(String username) {
List<User> userList = userDAO.selectUserByUserName(username);
if(userList.size()>0)
return true;
else
return false;
}
}
-------------------------------------------------------UserController-------------------------------------
package com.liusk.controller;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.liusk.base.UserCounts;
import com.liusk.entity.User;
import com.liusk.service.UserService;
@Controller
@RequestMapping("user")
public class UserController {
@Autowired
private UserService userService;
@SuppressWarnings("rawtypes")
@RequestMapping("login.do")
public ModelAndView login(String username,String password,HttpServletRequest request){
User user = new User();
user.setUsername(username);
user.setPassword(password);
List<User> userList = userService.selectUser(user);
if(userList.size()>0){
request.setAttribute("userList", userList);return new ModelAndView("index");
}else
return new ModelAndView("login");
}
@RequestMapping("regist.do")
public ModelAndView regist(String username,String password,HttpServletRequest request){
User user = new User();
user.setUsername(username);
user.setPassword(password);
boolean flag = true;
flag = userService.existUser(username);
if(!flag)
userService.insertUser(user);
return new ModelAndView("login");
}
}
至此，src下的java源码完毕。
下面是jsp页面部分。
-----------------------------------------------------login.jsp--------------------------------------------------
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href=" <%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录页面</title>
</head>
<body>
<div>
<div>
<form action="user/login.do" method="post">
<label>用户名：</label>
<input type="text" name="username" />
<label>密码:</label>
<input type="password" name="password"/>
<button type="submit">登录</button>
<button type="reset" >重置</button>
</form>
</div>
</div>
</body>
</html>
-----------------------------------------------------index.jsp--------------------------------------------------------
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="com.liusk.entity.User" %>
<%@ page import="java.util.List" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%
List<User> userList = (List<User>)request.getAttribute("userList");%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href=" <%=basePath%>"/>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>index</title>
</head>
<body>
<div>
<p>欢迎<%=userList.get(0).getUsername() %>!</p>
</div>
<div align="center" style="width:200;height:200">
<form action="user/regist.do" method="post">
<input type="text" name="username"/>
<input type="text" name="password"/>
<button type="submit">提交</button>
<button type="reset">重置</button>
</form>
</div>
</body>
</html>
jsp你懂得，这些页面就不做多解释。
总结，会用框架不难，难的是写一个框架出来，有梦就要勇敢飞。
springmvc + mybatis整合详细，及遇到的问题请参看以下资料：
参考资料：
http://www.springmvc,net/detail/6074493.html
http://my.spring.net/wangbiglei/blog/489583
http://my.springmvc.net/wangbiglei/blog/489604
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原文地址：http://www.cnblogs.com/lucene110/p/4858453.html
