SpringBoot+Mybatis+Durid整合多数据源的三种方式，第三种（注解切换）

pom文件和yml配置在SpringBoot+Mybatis+Durid整合多数据源的三种方式，第一种

这个方式，我目前系统正在使用，很方便很好用！注解切换

我的目录结构：

第一步：配置类

• DataSourceContextHolder

package ky.arraign.common.datasourcetools.kydsconfig;

import lombok.extern.slf4j.Slf4j;

/**
 * @Description:动态切换数据源配置文件
 * @Author:YJG
 * @Date 9:36 2020/5/25
 */
@Slf4j
public class DataSourceContextHolder {
    private static final ThreadLocal<String> contextHolder = new ThreadLocal<>();

    /**设置数据源名称*/
    public static void setDataSource(String dataSource){
        log.info("应用<{}>数据源！",dataSource);
        contextHolder.set(dataSource);
    }

    public static String getDataSource(){
        return contextHolder.get();
    }

    /**清除数据源*/
    public static void clearDataSource(){
        contextHolder.remove();
    }
}

• DynamicDataSource

package ky.arraign.common.datasourcetools.kydsconfig;


import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

/**
 * @Description: 动态切换数据源配置文件
 * @Author:YJG
 * @Date 9:34 2020/5/25
 */
public class DynamicDataSource extends AbstractRoutingDataSource {
    @Override
    protected Object determineCurrentLookupKey() {
        return DataSourceContextHolder.getDataSource();
    }
}

• DataSourceConfig

package ky.arraign.common.datasourcetools.kydsconfig;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;

/**
 * @Description:动态切换数据源配置文件
 * @Author:YJG
 * @Date 9:39 2020/5/25
 */
@Configuration
@MapperScan(sqlSessionFactoryRef = "SqlSessionFactory",basePackages = "ky.arraign.*.mapper")
public class DataSourceConfig {
    /**引入数据源*/
    @Bean(name = "arraignDataSource")
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource.druid.arraign")
    public DataSource getDateSourceArraign() {
        /**下面一行代码表示启用阿里数据源*/
        return DruidDataSourceBuilder.create().build();
        /**下面一行代码表示启用SpringBoot2.0默认数据源hikari*/
        // return DataSourceBuilder.create().build();
    }
    @Bean(name = "dzblDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.druid.dzbl")
    public DataSource getDateSourceDzbl() {
        return  DruidDataSourceBuilder.create().build();
        //return DataSourceBuilder.create().build();
    }
    @Bean(name = "gawlDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.druid.gawl")
    public DataSource getDateSourceGawl() {
        return  DruidDataSourceBuilder.create().build();
        //return DataSourceBuilder.create().build();
    }
    /**
     * 数据源切换: 通过AOP在不同数据源之间动态切换
     */
    @Bean(name = "dynamicDataSource")
    public DataSource dynamicDataSource(){

        DynamicDataSource dynamicDataSource = new DynamicDataSource();
        //设置默认数据源
        dynamicDataSource.setDefaultTargetDataSource(getDateSourceArraign());
        //配置多数据源
        Map<Object,Object> dsMap = new HashMap<>(2);
        dsMap.put(DataSourceName.ARRAIGN,getDateSourceArraign());
        dsMap.put(DataSourceName.DZBL,getDateSourceDzbl());
        dsMap.put(DataSourceName.GAWL,getDateSourceGawl());

        dynamicDataSource.setTargetDataSources(dsMap);
        return dynamicDataSource;
    }
    @Bean(name = "SqlSessionFactory")
    public SqlSessionFactory arraignSqlSessionFactory(@Qualifier("dynamicDataSource") DataSource dynamicDataSource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dynamicDataSource);
        bean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources("classpath*:ky/arraign/**/mapper/xml/*Mapper.xml"));
        return bean.getObject();
    }
    /**
     * @Description:配置@Transactional注解事务(影响数据源切换注释掉)
     *              配置事务需要额外增加@Transactional注解
     * @Author:YJG
     * @Date 10:59 2020/5/26
     * @Param
     * @ReturnType
     */
    @Bean(name = "arraignDataSourceManager")
    public PlatformTransactionManager arraignDataSourceManager(@Qualifier("arraignDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
    @Bean(name = "dzblDataSourceManager")
    public PlatformTransactionManager DZBLDataSourceManager(@Qualifier("dzblDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
    @Bean(name = "gawlDataSourceManager")
    public PlatformTransactionManager gawlDataSourceManager(@Qualifier("gawlDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
}

• DataSourceAspect

package ky.arraign.common.datasourcetools.kyaspect;

import ky.arraign.common.datasourcetools.kyannotation.KYDataSource;
import ky.arraign.common.datasourcetools.kydsconfig.DataSourceContextHolder;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

/**
 * @Description:自定义切面
 * @Author:YJG
 * @Date 9:43 2020/5/25
 */
@Aspect
@Component
public class DataSourceAspect {
    /**自定义切点*/
    @Pointcut("@annotation(ky.arraign.common.datasourcetools.kyannotation.KYDataSource)")
    public void pointcutConfig(){

    }
    @Before("pointcutConfig()")
    public void before(JoinPoint joinPoint){
        //获得当前访问的class
        Class<?> className = joinPoint.getTarget().getClass();
        //获得访问的方法名
        String methodName = joinPoint.getSignature().getName();
        //得到方法的参数的类型
        Class[] argClass = ((MethodSignature)joinPoint.getSignature()).getParameterTypes();

        String dataSource = null;
        try {
            // 得到访问的方法对象
            Method method = className.getMethod(methodName, argClass);
            // 判断是否存在@KYDataSource
            if (method.isAnnotationPresent(KYDataSource.class)) {
                KYDataSource annotation = method.getAnnotation(KYDataSource.class);
                // 取出注解中的数据源名
                dataSource = annotation.value();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 切换数据源
        DataSourceContextHolder.setDataSource(dataSource);
    }



    @After("pointcutConfig()")
    public void after(JoinPoint joinPoint){
        DataSourceContextHolder.clearDataSource();
    }
}

• KYDataSource

package ky.arraign.common.datasourcetools.kyannotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @Description:自定义注解
 * @Author:YJG
 * @Date 9:24 2020/5/25
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
public @interface KYDataSource {
    String value() default "arraign";
}

• DataSourceName

package ky.arraign.common.datasourcetools.kydsconfig;

/**
 * @Author:YJG86166
 * @Date:2020/5/25 16:41
 */
public final class DataSourceName {

    public static final String ARRAIGN = "arraign";
    public static final String DZBL = "dzbl";

}

开始使用

• controller

package ky.arraign.web.controller.system;

import ky.arraign.common.api.system.DemoApi;
import ky.arraign.common.po.system.Demo;
import ky.arraign.common.shiro.response.ServerResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * @Description: 多数据源应用案例
 * @Author:YJG
 * @Date 16:17 2020/5/25
 */
@RestController
@RequestMapping("/test")
public class DemoController {

    @Autowired
    DemoApi demoApi;
    @GetMapping("/demo")
    public ServerResponse demo(){
        List<Demo> demos = demoApi.listResult();
        return ServerResponse.responseSuccess(demos);
    }
}

• service 接口

package ky.arraign.common.api.system;

import ky.arraign.common.po.system.Demo;

import java.util.List;

/**
 * @Description:多数据源应用demo
 * @Author:YJG
 * @Date 16:23 2020/5/25
 * @Param
 * @ReturnType
 */
public interface DemoApi {
    /**测试
     * @return demo*/
    List<Demo> listResult();
}

• service 实现类

package ky.arraign.backservice.service;

import ky.arraign.backservice.mapper.DemoMapper;
import ky.arraign.common.api.system.DemoApi;
import ky.arraign.common.datasourcetools.kyannotation.KYDataSource;
import ky.arraign.common.datasourcetools.kydsconfig.DataSourceContextHolder;
import ky.arraign.common.datasourcetools.kydsconfig.DataSourceName;
import ky.arraign.common.po.system.Demo;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * @Author:yjg86166
 * @Date:2020/5/25 16:25
 */
@Service
@Slf4j
public class DemoApiImpl implements DemoApi {

    @Autowired
    private DemoMapper demoMapper;

    @Override
    //@KYDataSource //默认数据源arraign 可以不写
    //@KYDataSource(DataSourceName.ARRAIGN) //默认数据源 可以不写
    /**注解里字段的值*/
    @KYDataSource(DataSourceName.DZBL) //切换至单子笔录数据源
    @Transactional(value = "arraignDataSourceManager",rollbackFor = Exception.class)
    public List<Demo> listResult() {
        //此时在使用dzbl数据源
        List<Demo> demos = demoMapper.listDeptInfo();
        //切换至arraign
        DataSourceContextHolder.setDataSource("arraign");
        List<Demo> demos1 = this.listUseArraign();
        //...逻辑代码
        /**如果一下逻辑不需使用arraign则需要切换回dzbl*/
        DataSourceContextHolder.setDataSource("dzbl");
        return demos;
    }

    public List<Demo> listUseArraign(){
        return demoMapper.listDeptInfo();
    }
}

• mapper 接口类

package ky.arraign.backservice.mapper;

import ky.arraign.common.po.system.Demo;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * @Description: 多数据源应用demo
 * @Author:YJG
 * @Date 16:21 2020/5/25
 * @Param
 * @ReturnType
 */
@Component
public interface DemoMapper {
    List<Demo> listDeptInfo();
}

• mapper.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="ky.arraign.backservice.mapper.DemoMapper">
   <select id="listDeptInfo" resultType="ky.arraign.common.po.system.Demo">
       SELECT * FROM t_dept
   </select>
</mapper>

完成！使用的注意事项已经在代码进行提示，各位大佬如有疑问或者有建议请评论或者私信！！！

本文地址：https://blog.csdn.net/weixin_44253327/article/details/107590050