spring boot多数据源配置

1.引入pom依赖

        
            mysql
            mysql-connector-java
            runtime
        

        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.1.3
        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.0
        
        
            com.alibaba
            druid
            1.0.28
        

2.建立两套dao层及实体类文件以便多数据源隔离使用，具体层级如下

3.配置文件中配置多数据源配置信息 

4.编写数据源配置类

主库配置类：

package com.example.demo.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
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 javax.sql.DataSource;
import java.sql.SQLException;



@Configuration
@MapperScan(basePackages  = MasterDbConfig.PACKAGE , sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MasterDbConfig {
    private Logger logger = LoggerFactory.getLogger(MasterDbConfig.class);
    // 配置数据源文件位置
    static final String PACKAGE = "com.example.demo.ds1mapper.**";
    private static final String MAPPER_LOCATION = "classpath*:ds1mapper



@Configuration
@MapperScan(basePackages  = ClusterDbConfig.PACKAGE , sqlSessionFactoryRef = "clusterSqlSessionFactory")
public class ClusterDbConfig {
    private Logger logger = LoggerFactory.getLogger(ClusterDbConfig.class);
    // 精确到 cluster 目录，以便跟其他数据源隔离
    static final String PACKAGE = "com.example.demo.ds2mapper.**";
    private static final String MAPPER_LOCATION = "classpath*:ds2mapper/*.xml";
    private static final String DOMAIN_PACKAGE = "com.example.demo.ds2entity.**";

    @Value("${spring.datasource.url2}")
    private String dbUrl;

    @Value("${spring.datasource.username2}")
    private String username;

    @Value("${spring.datasource.password2}")
    private String password;

    @Value("${spring.datasource.driverClassName2}")
    private String driverClassName;



    @Bean(name="clusterDataSource")   //声明其为Bean实例
    public DataSource clusterDataSource() {
        DruidDataSource datasource = new DruidDataSource();

        datasource.setUrl(this.dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);
        return datasource;
    }

    @Bean(name = "clusterTransactionManager")
    public DataSourceTransactionManager clusterTransactionManager() {
        return new DataSourceTransactionManager(clusterDataSource());
    }

    @Bean(name = "clusterSqlSessionFactory")
    public SqlSessionFactory clusterSqlSessionFactory(@Qualifier("clusterDataSource") DataSource culsterDataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(culsterDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(ClusterDbConfig.MAPPER_LOCATION));
        sessionFactory.setTypeAliasesPackage(DOMAIN_PACKAGE);
        //mybatis 数据库字段与实体类属性驼峰映射配置
        sessionFactory.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);
        return sessionFactory.getObject();
    }
}

 使用时想要调用哪个数据源的数据，@Autowired 哪个mapper即可