Spring整合第三方框架-MyBatis整合Spring实现

news2024/12/28 4:40:15

Spring整合MyBatis的步骤

导入MyBatis整合Spring相关坐标。


        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.13</version>
        </dependency>

编写Mapper接口和Mapper.xml

在配置文件中配置SqlSessionFactoryBean和MapperScannerConfigurer

SqlSessionFactoryBean：向Spring容器中提供SqlSessionFactory

MapperScannerConfigurer：将Mapper接口类对象存储到Spring容器中（交给容器管理后就可以在需要的地方直接注入Mapper接口类对象即可）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       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">
    <!-- 配置数据源信息 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/db02"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 扫描指定的包，产生mapper对象存储到Spring容器中，不需要再配置Mapper对象-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.example.Mapper"/>
    </bean>

    <bean id="userService" class="com.example.Service.Impl.UserServiceImpl">
        <property name="empMapper" ref="empMapper"></property>
        <property name="userDAO" ref="userDAO"/>
        <property name="name" value="hhhh"/>
    </bean>

    <bean name="userDAO" class="com.example.DAO.Impl.UserDAOImpl"/>
</beans>

上述两个文件配置完成之后就替代了MyBatis原始代码中配置MyBatis参数的配置文件

原始代码的配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/db02"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <!--指定需要扫描的Mapper接口的包路径-->
    <mappers>
        <package name="com.example.Mapper"/>
    </mappers>
</configuration>

编写测试代码

package com.example.Test;


import com.example.Service.UserService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestApplicationContext {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("application.xml");
        UserService UserServiceBean = (UserService) context.getBean(UserService.class);
        UserServiceBean.show();
    }
}

接口实现类UserServiceImpl

package com.example.Service.Impl;

import com.example.DAO.UserDAO;
import com.example.Mapper.EmpMapper;
import com.example.Service.UserService;
import com.example.pojo.Emp;

import java.util.List;


public class UserServiceImpl implements UserService {
    public EmpMapper empMapper;

    public UserServiceImpl() {
        System.out.println("UserService对象创建");
    }

    private UserDAO userDAO;
    private String name;


    public void setName(String name) {
        this.name = name;
    }

    public void setUserDAO(UserDAO userDAO) {
        System.out.println("UserService执行注入UserDAO的操作:setDAO方法");
        this.userDAO = userDAO;
    }

    @Override
    public void show() {
        List<Emp> all = empMapper.findAll();
        for (Emp emp : all) {
            System.out.println(emp);
        }
    }

    public void setEmpMapper(EmpMapper empMapper) {
        this.empMapper = empMapper;
    }
}