Java 之Spring框架整合mybatis

一、配置maven

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.1.7.RELEASE</version>
        </dependency>
        <!--
            https://mvnrepository.com/artifact/org.springframework/spring-context
        -->
        <!-- 为Spring 核心提供了大量扩展 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.1.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.1.7.RELEASE</version>
        </dependency>
        
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.3</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.0</version>
        </dependency>
        <!-- C3P0连接池 -->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.39</version>
        </dependency>
    </dependencies>

二、applicationContext.xml配置

<?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-3.0.xsd">

    
    <context:component-scan base-package="com"></context:component-scan>
    

    <!-- 加载jdbc.properties配置文件 -->
    <context:property-placeholder location="classpath:jdbc.properties" />
    <!-- 使用c3p0数据源连接数据库 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}" />
        <property name="jdbcUrl" value="${jdbc.url}" />
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>
    <!--
        连接完数据库之后就拥有了访问数据库的能力，然后通过SqlSessionfactoryBean创建SqlSessionFactory工厂，并且绑定mybatis的核心配置文件和mapper.xml文件
    -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation" value="classpath:mybatis-config.xml" />
        <property name="mapperLocations" value="classpath:com/dao/*.xml" />
    </bean>
    <!-- 创建SqlSession对象 -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory" />
    </bean>
    
</beans>

三、具体代码

 

 AdminMapper.java

package com.mapper;

import java.util.List;

import com.entity.Admin;

public interface AdminMapper {
    List<Admin> selectAdmin();
}

AdminMapperImpl.java

package com.mapper.impl;

import java.util.List;

import javax.annotation.Resource;

import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.stereotype.Component;

import com.entity.Admin;
import com.mapper.AdminMapper;

@Component(value = "AdminMapper1")
public class AdminMapperImpl implements AdminMapper{
    @Resource(name = "sqlSession")
    private SqlSessionTemplate sqlSession;
    
    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    @Override
    public List<Admin> selectAdmin() {
        AdminMapper mapper = sqlSession.getMapper(AdminMapper.class);
        return mapper.selectAdmin();
    }

}

adminMapper.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.mapper.AdminMapper">
    <select id="selectAdmin" resultType="com.entity.Admin">
        select * from j_admin
    </select>
</mapper>

运行代码

package com.test;

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.entity.Admin;
import com.mapper.AdminMapper;

public class Test {

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        AdminMapper adminMapper = (AdminMapper) context.getBean("AdminMapper1");
        List<Admin> admin = adminMapper.selectAdmin();
        for(Admin i : admin){
            System.out.println(i);
        }
    }
}