纯注解版spring与mybatis的整合过程

今天给大家分享纯注解版spring与mybatis的整合

mybatis包下：有这几个，上面图片没有展开

配置Bean：MyBatisAutoConfiguration

User

UserDAO

MybatisProperties

MyBatisAutoConfiguration：

package com.baizhiedu.mybatis;

import com.alibaba.druid.pool.DruidDataSource;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import javax.sql.DataSource;
import java.io.IOException;

@Configuration
@ComponentScan(basePackages = "com.baizhiedu.mybatis")
@MapperScan(basePackages = "com.baizhiedu.mybatis") //扫描dao接口对象
public class MyBatisAutoConfiguration {

    //连接池对象
    @Bean
    public DataSource dataSource(){
        DruidDataSource dataSource=new DruidDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/mybatis?useUnicode=true&charaterEcoding=utf-8");
        dataSource.setUsername("root");
        dataSource.setPassword("123456");
        return dataSource;
    }
    //工厂对象
    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){
        SqlSessionFactoryBean sqlSessionFactoryBean=new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        sqlSessionFactoryBean.setTypeAliasesPackage("com.baizhiedu.mybatis");
        //设置Mapper文件的路径，这个只会 扫描一个Mapper文件，如果需要扫描多个文件，则需要让他扫描包
        sqlSessionFactoryBean.setMapperLocations(new ClassPathResource("UserDAOMapper.xml"));

        //通配写法让他扫描包下的所有Mapper文件资源
        try {
            ResourcePatternResolver resolver=new PathMatchingResourcePatternResolver();
            Resource[] resources=resolver.getResources("com.baizhiedu.mapper/*Mapper.xml");
            sqlSessionFactoryBean.setMapperLocations(resources);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return  sqlSessionFactoryBean;
    }
}

User：

package com.baizhiedu.mybatis;

public class User {
    private Integer id;
    private String name;
    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

UserDAO：

package com.baizhiedu.mybatis;

public interface UserDAO {
    public void save(User user);
}

UserDAOMapper.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.baizhiedu.mybatis.UserDAO">
    <!--使用insert，update，delete，select标签来写sql语句-->
    <insert id="save" parameterType="User">
        insert into tb_users (name,password) values (#{name},#{password})
    </insert>

</mapper>

TestMyBatis：

package com.baizhiedu;

import com.baizhiedu.mybatis.MyBatisAutoConfiguration;
import com.baizhiedu.mybatis.User;
import com.baizhiedu.mybatis.UserDAO;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class TestMyBatis {
    //用于测试Spring+Mybatis注解的整合
    @Test
    public void test1(){
        ApplicationContext ctx=new AnnotationConfigApplicationContext(MyBatisAutoConfiguration.class);
        UserDAO userDAO=(UserDAO)ctx.getBean("userDAO");

        User user=new User();
        user.setName("annotation1");
        user.setPassword("123456");

        userDAO.save(user);
    }
}

上面配置Bean：MyBatisAutoConfiguration：存在数据耦合，可以通过配置文件来解耦合：

mybatis.properties：

mybatis.driverClassName=com.mysql.jdbc.Driver
mybatis.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&charaterEcoding=utf-8
mybatis.username=root
mybatis.password=123456
mybatis.typeAliasesPackages=com.baizhiedu.mybatis
mybatis.mapperLocations=com.baizhiedu.mapper/*Mapper.xml

定义类来封装配置文件中的配置信息:MybatisProperties:

package com.baizhiedu.mybatis;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component
@PropertySource("classpath:mybatis.properties") //读取配置文件
public class MybatisProperties {
    @Value("${mybatis.driverClassName}")
    private String driverClassName;
    @Value("${mybatis.url}")
    private String url;
    @Value("${mybatis.username}")
    private String username;
    @Value("${mybatis.password}")
    private String password;
    @Value("${mybatis.typeAliasesPackages}")
    private String typeAliasesPackages;
    @Value("${mybatis.mapperLocations}")
    private String mapperLocations;

    public String getDriverClassName() {
        return driverClassName;
    }

    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    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;
    }

    public String getTypeAliasesPackages() {
        return typeAliasesPackages;
    }

    public void setTypeAliasesPackages(String typeAliasesPackages) {
        this.typeAliasesPackages = typeAliasesPackages;
    }

    public String getMapperLocations() {
        return mapperLocations;
    }

    public void setMapperLocations(String mapperLocations) {
        this.mapperLocations = mapperLocations;
    }
}

更改配置MyBatisAutoConfiguration:

package com.baizhiedu.mybatis;

import com.alibaba.druid.pool.DruidDataSource;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import javax.sql.DataSource;
import java.io.IOException;

@Configuration
@ComponentScan(basePackages = "com.baizhiedu.mybatis")
@MapperScan(basePackages = "com.baizhiedu.mybatis") //扫描dao接口对象
public class MyBatisAutoConfiguration {

    @Autowired //注解 自定义类型注入，用来解耦合
    private MybatisProperties mybatisProperties;

    //连接池对象
    @Bean
    public DataSource dataSource(){
        DruidDataSource dataSource=new DruidDataSource();
        dataSource.setDriverClassName(mybatisProperties.getDriverClassName());
        dataSource.setUrl(mybatisProperties.getUrl());
        dataSource.setUsername(mybatisProperties.getUsername());
        dataSource.setPassword(mybatisProperties.getPassword());
        return dataSource;
    }
    //工厂对象
    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){
        SqlSessionFactoryBean sqlSessionFactoryBean=new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        sqlSessionFactoryBean.setTypeAliasesPackage(mybatisProperties.getTypeAliasesPackages());
        //设置Mapper文件的路径，这个只会 扫描一个Mapper文件，如果需要扫描多个文件，则需要让他扫描包
        sqlSessionFactoryBean.setMapperLocations(new ClassPathResource("UserDAOMapper.xml"));

        //通配写法让他扫描包下的所有Mapper文件资源
        try {
            ResourcePatternResolver resolver=new PathMatchingResourcePatternResolver();
            Resource[] resources=resolver.getResources(mybatisProperties.getMapperLocations());
            sqlSessionFactoryBean.setMapperLocations(resources);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return  sqlSessionFactoryBean;
    }
}

TestMyBatis：test：

到此这篇关于基于纯注解实现spring与mybatis的整合的文章就介绍到这了,更多相关spring与mybatis整合内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们！