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如何搭建多数据源项目只要以下简单几步;

一. 创建核心在config.datasource文件夹里

二. 引入相对应的jar包

三. 创建数据库连接配置

四. 写逻辑代码进行验证

1.DataSource

package com.irootech.config.datasource;import java.lang.annotation.*;@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DataSource {DataSourceType value() default DataSourceType.MYSQL;
}

2.DataSourceAspect

package com.irootech.config.datasource;import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;@Aspect
@Component
public class DataSourceAspect {@Before("@annotation(dataSource)")public void changeDataSource(DataSource dataSource) {DataSourceType dataSourceType = dataSource.value();DynamicDataSource.setDataSourceType(dataSourceType);}@After("@annotation(dataSource)")public void restoreDataSource(DataSource dataSource) {DynamicDataSource.clearDataSourceType();}
}

3.DataSourceConfig

package com.irootech.config.datasource;import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;@Configuration
@MapperScan(basePackages = "com.irootech.mapper", sqlSessionFactoryRef = "sqlSessionFactory")
public class DataSourceConfig {@Bean(name = "mysqlDataSource")@ConfigurationProperties(prefix = "spring.datasource.mysql")public DataSource mysqlDataSource() {return DataSourceBuilder.create().build();}@Bean(name = "postgresDataSource")@ConfigurationProperties(prefix = "spring.datasource.postgres")public DataSource postgresDataSource() {return DataSourceBuilder.create().build();}@Bean(name = "phoenixDataSource")@ConfigurationProperties(prefix = "spring.datasource.phoenix")public DataSource phoenixDataSource() {return DataSourceBuilder.create().build();}@Bean(name = "dorisDataSource")@ConfigurationProperties(prefix = "spring.datasource.doris")public DataSource dorisDataSource() {return DataSourceBuilder.create().build();}@Bean@Primarypublic DynamicDataSource dataSource(@Qualifier("mysqlDataSource") DataSource mysqlDataSource,@Qualifier("postgresDataSource") DataSource postgresDataSource,@Qualifier("phoenixDataSource") DataSource phoenixDataSource,@Qualifier("dorisDataSource") DataSource dorisDataSource) {Map<Object, Object> targetDataSources = new HashMap<>();targetDataSources.put(DataSourceType.MYSQL, mysqlDataSource);targetDataSources.put(DataSourceType.POSTGRES, postgresDataSource);targetDataSources.put(DataSourceType.PHOENIX, phoenixDataSource);targetDataSources.put(DataSourceType.DORIS, dorisDataSource);return new DynamicDataSource(mysqlDataSource,targetDataSources);}@Beanpublic SqlSessionFactory sqlSessionFactory(@Qualifier("dataSource") DataSource dataSource) throws Exception {MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();bean.setDataSource(dataSource);return bean.getObject();}@Beanpublic DataSourceTransactionManager transactionManager(@Qualifier("dataSource") DataSource dataSource) {return new DataSourceTransactionManager(dataSource);}
}

4.DataSourceType

package com.irootech.config.datasource;public enum DataSourceType {MYSQL,POSTGRES,PHOENIX,DORIS
}

5.DynamicDataSource

package com.irootech.config.datasource;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;import javax.sql.DataSource;
import java.util.Map;public class DynamicDataSource extends AbstractRoutingDataSource {private static final ThreadLocal<DataSourceType> contextHolder = new ThreadLocal<>();public DynamicDataSource(DataSource defaultTargetDataSource, Map<Object, Object> targetDataSources) {super.setDefaultTargetDataSource(defaultTargetDataSource);super.setTargetDataSources(targetDataSources);super.afterPropertiesSet();}@Overrideprotected Object determineCurrentLookupKey() {return contextHolder.get();}public static void setDataSourceType(DataSourceType dataSourceType) {contextHolder.set(dataSourceType);}public static DataSourceType getDataSourceType() {return contextHolder.get();}public static void clearDataSourceType() {contextHolder.remove();}
}

6. DataSourceMapper

package com.irootech.mapper;import com.irootech.config.datasource.DataSource;
import com.irootech.config.datasource.DataSourceType;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;import java.util.List;@Mapper
public interface DataSourceMapper {@DataSource(DataSourceType.MYSQL)@Select("select * from data_source")List<Object> getDataSourceMysql();@DataSource(DataSourceType.PHOENIX)@Select("select * from data_source")List<Object> getDataSourcePhoenix();
}

7. DataSourceServiceImpl

package com.irootech.service.impl;import com.irootech.mapper.DataSourceMapper;
import com.irootech.service.DataSourceService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;@Service
public class DataSourceServiceImpl implements DataSourceService {@Autowiredprivate DataSourceMapper dataSourceMapper;@Overridepublic List<Object> getDataSourceMysql() {return dataSourceMapper.getDataSourceMysql();}@Overridepublic List<Object> getDataSourcePhoenix() {return dataSourceMapper.getDataSourcePhoenix();}
}

8. WebController

package com.irootech.web;import com.irootech.service.DataSourceService;
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;@RestController
@RequestMapping("/web_controller")
public class WebController {@Autowiredprivate DataSourceService dataSourceService;@GetMapping(value ="/message")public String message() {List<Object> dataSourceMysqlList = dataSourceService.getDataSourceMysql();System.out.println(dataSourceMysqlList);List<Object> dataSourcePhoenixList = dataSourceService.getDataSourcePhoenix();System.out.println(dataSourcePhoenixList);return "WebController created";}
}

下载demo地址：https://download.csdn.net/download/u013772876/90233957