SSM初步整合一

SSM（spring+springmvc+mybatis）初步整合一配置步骤：

步骤一、导入所需jar包

步骤二、配置web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>

  <!--1.针对spring的配置  -->
  <context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  
  <!-- 注册ServletContext监听器，创建容器对象，并且将ApplicationContext对象放到Application域中 -->
  <listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>


  <!-- 针对SpringMVC的配置：：：：：：中央调度器：本质上一个serlvet            配置的关于SpringmVC组件 -->
  <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:applicationContext.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
  <servlet-name>springmvc</servlet-name>
  <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <!--乱码过滤器  -->
  <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>
  <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
  </init-param>
  </filter>
  <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
   </filter-mapping>
      
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

步骤三、准备我们的mybatis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>
     <mappers>
        <mapper resource="cn/hmy/entity/IUserInfoDAO.xml" />
        <!-- 
        只需配置一次  但小配置文件必须放在dao包中，且与dao中的接口名称相同
        <package name="cn.hmy.dao"/> -->
    </mappers>
</configuration>

步骤四、准备对应的小配置文件

<?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="cn.hmy.dao.IUserInfoDAO">

    <select id="add" parameterType="cn.hmy.entity.UserInfo">
         insert into userinfo values(SEQ_SSM.nextval,#{uname},#{uage})
    </select>
</mapper>

附：也可以使用别名

<?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="cn.hmy.entity"/>
  </typeAliases>



     <mappers>
        <mapper resource="cn/hmy/entity/IUserInfoDAO.xml" />
        <!-- 
        只需配置一次  但小配置文件必须放在dao包中，且与dao中的接口名称相同
        <package name="cn.hmy.dao"/> -->
    </mappers>
</configuration>

在小配置中parameterType="cn.hmy.entity.UserInfo" 就可以省略包名

步骤五、准备jsp页面

<%@ page language="java" import="java.util.*" 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">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>添加</title>
  </head>
  
  <body>
   <form action="${pageContext.request.contextPath }/userAction.do" method="post">
            用户名：<input name="uname"/> <br/>
            用户年龄<input name="uage"/><br/>
       <input type="submit" value="save"/>
    </form>
  </body>
</html>

步骤四、配置applicationContext.xml文件

注意：

（1）.创建sessionFactory的实现类通过SqlSessionFactoryBean工厂对象

（2）此处的dao没有实现类其实现类是通过动态代理得到的

所以我们注册dao时用到了org.mybatis.spring.mapper.MapperScannerConfigurer 通过它的属性来配置

（3）.我们注册的dao没有id属性，当service引用其对象时

如果dao接口的名称为IXxxxDao,引用时就原样输出

如果dao接口的名称为XxxxDao,引用时首字母要小写

<?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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
    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">

    <!-- 注册jdbc属性 -->
    <bean
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties"></property>
    </bean>


    <!--注册c3p0数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.className}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!-- 配置sessionFactory -->
    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置dao  -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
       <property name="sqlSessionFactoryBeanName" value="sessionFactory"></property>
       <property name="basePackage" value="cn.hmy.dao"></property>
    </bean>

    <!--配置service  -->
    <bean id="userService" class="cn.hmy.service.UserInfoServiceImpl">
       <property name="dao" ref="IUserInfoDAO"></property>
    </bean>
    
    <!--配置controller -->
    <bean id="/userAction.do" class="cn.hmy.controller.UserInfoController">
      <property name="service" ref="userService"></property>
    </bean>





    <!--配置事务管理器  -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置开启事务操作  -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
    <tx:attributes>
    <!--指定在连接方法上应用的事务属性  -->
    <tx:method name="add*" isolation="DEFAULT" propagation="REQUIRED"/>
    </tx:attributes>
    </tx:advice>
    <!--aop配置  -->
    <aop:config>
      <aop:pointcut expression="execution(* *..service.*.*(..))" id="stockPointcut"/>
      <aop:advisor advice-ref="txAdvice" pointcut-ref="stockPointcut"/>
    </aop:config>
    
    
</beans>

配置完毕，

下面讲解代码

index.jsp提交后会将请求提交给对应的controller,controller会模拟servlet拆解请求参数封装成对应的实体

package cn.hmy.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import cn.hmy.entity.UserInfo;
import cn.hmy.service.IUserInfoService;

public class UserInfoController implements Controller{
   private  IUserInfoService service;

public ModelAndView handleRequest(HttpServletRequest request,
        HttpServletResponse response) throws Exception {
    String uname=request.getParameter("uname");
    Integer uage=Integer.valueOf(request.getParameter("uage"));
    
    UserInfo info=new UserInfo();
    info.setUage(uage);
    info.setUname(uname);
    service.add(info);
    return new ModelAndView("/welcome.jsp");
}

public IUserInfoService getService() {
    return service;
}

public void setService(IUserInfoService service) {
    this.service = service;
}
}

controller会逐级调用service,dao

package cn.hmy.service;

import cn.hmy.dao.IUserInfoDAO;
import cn.hmy.entity.UserInfo;

public class UserInfoServiceImpl implements IUserInfoService {
    private IUserInfoDAO dao;

    public void add(UserInfo info) {
        dao.add(info);
    }
    
    public IUserInfoDAO getDao() {
        return dao;
    }

    public void setDao(IUserInfoDAO dao) {
        this.dao = dao;
    }

}

package cn.hmy.dao;

import cn.hmy.entity.UserInfo;

/**
 * 不需要dao的实现类，通过代理生成
 * @author 
 *
 */
public interface IUserInfoDAO {
    public void add(UserInfo info);
}

调用完成之后即添加完成之后，会返回ModelANdView视图，至此我们的SSM初步整合完成