springmvc-mybatis整合

1.整合所需要的jar包
2.在web.xml配置springmvc 的dispathcerservlet

<?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">

 <!-- springmvc dispatcherservlet -->
 <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:spring-mybatis.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
 </servlet> 
 <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <!-- 拦截所有请求给  spring的请求分发器处理 -->
    <url-pattern>/</url-pattern>
 </servlet-mapping>

</web-app>

3.mybaits开发有两种方式，第一种是以原始的dao开发，第二种是动态sql代理开发。下面整合以第一种方式，

spring的配置文件，由此来管理sqlsessionfactory，数据源等。

<?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"
    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-4.3.xsd">
    <!-- 扫描控制器注解包 -->
    <context:component-scan base-package="com.ssm.controller"></context:component-scan>
    <!-- 1.加载c3p0配置文件 -->
    <context:property-placeholder location="classpath:c3p0.properties"/>
    <!-- 2.配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件，如果需要配置一些mybatis的基本配置可以使用configLocation -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描mapping.xml文件 -->
        <property name="mapperLocations" value="classpath:com/ssm/model/User.xml"></property>
    </bean>

    <!-- 页面处理器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name = "prefix" value="/WEB-INF/views/"></property>
        <property name = "suffix" value = ".jsp"></property>
    </bean>

    <!-- userdao -->
    <bean id="dao" class="com.ssm.dao.impl.UserDAOImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>

4.配置mapper.xml, 以一个usermapper.xml为例，对应的javabean为User.java

package com.ssm.model;

public class User {
    private String username;
    private String password;
    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;
    }
    @Override
    public String toString() {
        return this.getUsername()+this.getPassword();
    }
}

<?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.itcast.ssm.mapper.UserMapper">
    <select id="findUserById" parameterType="int" resultType="com.ssm.model.User">
        SELECT * FROM USER WHERE id=#{value}
    </select>   
</mapper>

5.dao接口以及实现

//1.dao接口

package com.ssm.dao;

import com.ssm.model.User;

public interface UserDAO {

    public User selectByID(int id);
}

//2.实现
package com.ssm.dao.impl;

import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import com.ssm.dao.UserDAO;
import com.ssm.model.User;

public class UserDAOImpl extends SqlSessionDaoSupport implements UserDAO {

    @Override
    public User selectByID(int id) {
        SqlSession sqlsession = this.getSqlSession();

        User user = sqlsession.selectOne("findUserById", id);
        return user;
    }

}

6.实现控制器基于注解的方式

package com.ssm.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.ssm.dao.UserDAO;
import com.ssm.model.User;


@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserDAO dao;

    @RequestMapping(value="/select",method=RequestMethod.GET)
    public String selectById(@RequestParam("id")int id)
    {
        System.out.println("test");
        User user = dao.selectByID(id);
        //没有传递数据过jsp直接打印做简单测试
        System.out.println(user.toString());
        return "index";
    }


}

以上，