Spring集成Mybatis(Dao方式开发)

Spring整成Mybatis注意事项：

　　 1. 关键jar包不能少

　　2.可以单独整理好Mybatis框架，测试无误再集成Spring

　　3.集成时，参数级别的细节可以选择忽略，但思路必须清晰

代码如下：

　　1.jar包

　　

　　2.项目目录结构

　　

　　3.SqlMapConfig.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>
      <!-- 设置类别名 -->
      <typeAliases>
          <!-- 设置单个别名 -->
          <typeAlias type="com.lf.entity.User" alias="user"/>
      </typeAliases>

     <mappers>
         <!-- resource加载单个映射文件 -->
         <mapper resource="sqlmap/UserMapper.xml"/>
     </mappers>   

 </configuration>  

　　4.applicationContext.xml

<?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:aop="http://www.springframework.org/schema/aop"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-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/aop
        http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
    <!-- 加载配置文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!--数据库连接池配置,使用dbcp-->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
     <!-- sqlSessionFactory -->
     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <!-- 加载mybatis的配置文件 -->
         <property name="configLocation" value="mybatis/SqlMapConfig.xml" />
         <!-- dataSource数据源 -->
         <property name="dataSource" ref="dataSource" />
     </bean>
     <!-- 注入原始dao接口 -->
     <bean id="userDao" class="com.lf.dao.impl.UserDaoImpl">
         <property name="sqlSessionFactory" ref="sqlSessionFactory" />
     </bean>
 </beans>   

　   5.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="userMapper">

    <select id="queryUserById" parameterType="int" resultType="user">
        select user_id as id,name,age from t_user where user_id=#{id}
    </select>
</mapper>

　　6.log4j.properties

log4j.rootLogger=DEBUG, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n

　　7.jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=leifei

　　8.Dao接口以及Dao实现

package com.lf.dao;

import com.lf.entity.User;

public interface UserDao {

    public User queryUserById(int userId) throws Exception;

}

package com.lf.dao.impl;

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

import com.lf.dao.UserDao;
import com.lf.entity.User;

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {

    @Override
    public User queryUserById(int userId) throws Exception {
        SqlSession session = this.getSqlSession();
        //执行查询
        User user = session.selectOne("userMapper.queryUserById",userId);
        return user;
    }

}

　　9.User实体

package com.lf.entity;

public class User {
    private int id;
    private String name;
    private int age;
    private String address;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
    }

}

　　10.Junit测试类

package com.lf.test;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.lf.dao.UserDao;
import com.lf.entity.User;

public class UserDaoImplTest {

    private ApplicationContext applicationContext;

    @Before
    public void setUp() throws Exception {
        applicationContext = new ClassPathXmlApplicationContext("spring/applicationContext.xml");
    }

    @Test
    public void test() throws Exception {
        UserDao userDao =  (UserDao) applicationContext.getBean("userDao");
        User user = userDao.queryUserById(1);
        System.out.println(user);

    }

}

　　11.测试结果