1、首先需要配置多个数据源

    #多数据源配置
spring.datasource.db1.url=jdbc:mysql://localhost:3306/hibernate?useSSL=false
spring.datasource.db1.username=root
spring.datasource.db1.password=root
spring.datasource.db1.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.db2.url=jdbc:mysql://localhost:3306/spring?useSSL=false
spring.datasource.db2.username=root
spring.datasource.db2.password=root
spring.datasource.db2.driver-class-name=com.mysql.jdbc.Driver

hema.duoduo.db.url=jdbc:mysql://***:3306/wdk_scm_ism?useSSL=false&autoReconnect=true&useUnicode=true&createDatabaseIfNotExist=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
hema.duoduo.db.username=****
hema.duoduo.db.password=****
hema.duoduo.db.initial-size=1
hema.duoduo.db.max-active=2
hema.duoduo.db.max-wait=60000



hema.duoduo.db.data-sources.schedulingDataSource.url=jdbc:mysql://****.com:3306/wdk_log_review?useSSL=false&autoReconnect=true&useUnicode=true&createDatabaseIfNotExist=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
hema.duoduo.db.data-sources.schedulingDataSource.username=****
hema.duoduo.db.data-sources.schedulingDataSource.password=****

2、创建两个数据源

        必须要有一个是默认的

        必须要有一个是默认的

        必须要有一个是默认的

package com.wdk.scm.ism.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.Resource;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.wdk.scm.ism.itemstandard.dal.mapper", sqlSessionFactoryRef = "defaultSqlSessionFactory")
public class DefaultDbConfig {
    @Primary
    @Bean(name = "defaultSqlSessionFactory")
    public SqlSessionFactory schedulingSqlSessionFactory(
            @Qualifier("defaultDataSource") DataSource defaultDataSource,
            @Value("classpath:/com/wdk/scm/ism/itemstandard/dal/mapper/mybatis-config.xml") Resource mybatisConfigLocation)
            throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setConfigLocation(mybatisConfigLocation);
        sqlSessionFactoryBean.setDataSource(defaultDataSource);

        return sqlSessionFactoryBean.getObject();
    }
    @Primary
    @Bean(name = "defaultSqlSessionTemplate")
    public SqlSessionTemplate schedulingSqlSessionTemplate(@Qualifier("defaultSqlSessionFactory") SqlSessionFactory defaultSqlSessionFactory) {
        return new SqlSessionTemplate(defaultSqlSessionFactory);
    }

package com.wdk.scm.ism.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;

import javax.sql.DataSource;

/**
 * 中商操作记录-数据库配置
 */
@Configuration
@MapperScan(basePackages = "com.wdk.scm.ism.logreview.mapper", sqlSessionFactoryRef = "schedulingSqlSessionFactory")
public class DbConfig implements ApplicationContextAware {
    private ApplicationContext ctx;

    @Bean(name = "schedulingSqlSessionFactory")
    //("schedulingDataSource")
    public SqlSessionFactory logSqlSessionFactory(@Qualifier("schedulingDataSource") DataSource schedulingDataSource/*, @Value("classpath:/xml/mybatis-config.xml")Resource mybatisConfigLocation*/) throws Exception{
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setMapperLocations(new Resource[]{ctx.getResource("classpath:/xml/LogReviewIMapper.xml")});
        //sqlSessionFactoryBean.setConfigLocation(mybatisConfigLocation);
        sqlSessionFactoryBean.setDataSource(schedulingDataSource);
        return sqlSessionFactoryBean.getObject();
    }

    @Bean(name = "schedulingSqlSessionTemplate")
    public SqlSessionTemplate schedulingSqlSessionTemplate(@Qualifier("schedulingSqlSessionFactory") SqlSessionFactory schedulingSqlSessionFactory) {
        return new SqlSessionTemplate(schedulingSqlSessionFactory);
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.ctx = applicationContext;
    }
}