有兩種方式：一種是分包的方式、一種是加註解的方式(@DataSource(ref=""))。

　　分包方式：項目結構圖如下：

分為com.itmayiedu.test01、com.itmayiedu.test02兩個包 裏面是dao和service層，數據操作。

com.itmayiedu.datasource 裏面放置數據源、數據庫事物有關。兩個配置相同。

兩個數據源，需要在其中一個添加@Primary註解，作為主數據源，不然數據庫找不到主的會報錯；在springboot 2.0的版本後可以不需要添加@Primary註解

package com.itmayiedu.datasource;

 
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
 
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.jdbc.datasource.DataSourceTransactionManager;

 
import javax.sql.DataSource;

//DataSource01
@Configuration // 註冊到springboot容器中
@MapperScan(basePackages = "com.itmayiedu.test01", sqlSessionFactoryRef = "test1SqlSessionFactory")
public class DataSource1Config {

    /**
     * 
     * @methodDesc: 功能描述:(配置test1數據庫)
     * @author: 余勝軍
     * @param: @return
     * @createTime:2017年9月17日 下午3:16:44
     * @returnType:@return DataSource
     * @copyright:上海每特教育科技有限公司
     * @QQ:644064779
     */
    @Bean(name = "test1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test1")
    @Primary
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    /**
     * 
     * @methodDesc: 功能描述:(test1 sql會話工廠)
     * @author: 余勝軍
     * @param: @param
     *             dataSource
     * @param: @return
     * @param: @throws
     *             Exception
     * @createTime:2017年9月17日 下午3:17:08
     * @returnType:@param dataSource
     * @returnType:@return
     * @returnType:@throws Exception SqlSessionFactory
     * @copyright:上海每特教育科技有限公司
     * @QQ:644064779
     */
    @Bean(name = "test1SqlSessionFactory")
    @Primary
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        // bean.setMapperLocations(
        // new
        // PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
        return bean.getObject();
    }

    /**
     * 
     * @methodDesc: 功能描述:(test1 事物管理)
     * @author: 余勝軍
     * @param: @param
     *             dataSource
     * @param: @return
     * @param: @throws
     *             Exception
     * @createTime:2017年9月17日 下午3:17:08
     * @returnType:@param dataSource
     * @returnType:@return
     * @returnType:@throws Exception SqlSessionFactory
     * @copyright:上海每特教育科技有限公司
     * @QQ:644064779
     */
    @Bean(name = "test1TransactionManager")
    @Primary
    public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "test1SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate testSqlSessionTemplate(
            @Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

　　application.properties：

###datasource1
spring.datasource.test1.driverClassName = com.mysql.jdbc.Driver
spring.datasource.test1.url = jdbc:mysql://localhost:3306/chapter3?useUnicode=true&characterEncoding=utf-8
spring.datasource.test1.username = root
spring.datasource.test1.password = zhaocheng
###datasource2
spring.datasource.test2.driverClassName = com.mysql.jdbc.Driver
spring.datasource.test2.url = jdbc:mysql://localhost:3306/chapter13?useUnicode=true&characterEncoding=utf-8
spring.datasource.test2.username = root
spring.datasource.test2.password = zhaocheng

　　TestController:

　　添加　　@Transactional(transactionManager = "test1TransactionManager")　　　添加並且區別事物。

package com.itmayiedu.controller;

import com.itmayiedu.test01.service.UserServiceTest01;
import com.itmayiedu.test02.service.UserServiceTest02;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@Slf4j
public class TestController {

    @Autowired
    private UserServiceTest01 userServiceTest01;
    @Autowired
    private UserServiceTest02 userServiceTest02;

    @RequestMapping("/testString")
    public String testString(){
        log.info("testString");
        return "springboot01 test";
    }

    @RequestMapping("/insert")
    @Transactional(transactionManager = "test1TransactionManager")
    public Integer insertRole(String role_name,String note){
        log.info("111111");
        Integer a = userServiceTest01.insertRole(role_name, note);
        int b = 100/Integer.valueOf(note);
       return a;
    }

    @RequestMapping("/update")
    @Transactional(transactionManager = "test2TransactionManager")
    public Integer updateRole(String role_name,String note){
        log.info("222222");
        Integer a = userServiceTest02.insertRole(role_name, note);
        int b = 100/Integer.valueOf(note);
        return a;
    }
}

　　啟動類application：

package com.itmayiedu;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan
@MapperScan("com.itmayiedu.*.mapper")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

這裏面是添加　　　　@MapperScan("com.itmayiedu.*.mapper")　　　　在啟動是掃包，或者也可以在 每個dao層添加@Mapper註解。

　　UserMapperTest01:

package com.itmayiedu.test01.mapper;

import com.itmayiedu.entity.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

@Repository
public interface UserMapperTest01 {
    @Select("SELECT * FROM T_ROLE WHERE ROLE_NAME = #{role_name}")
    User findByName(@Param("role_name") String role_name);
    @Insert("INSERT INTO T_ROLE(ROLE_NAME, NOTE) VALUES(#{role_name}, #{note})")
    int insert(@Param("role_name") String role_name, @Param("note") String note);
}

　　UserServiceTest01：

package com.itmayiedu.test01.service;

import com.itmayiedu.test01.mapper.UserMapperTest01;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceTest01 {

    @Autowired
    private UserMapperTest01 userMapperTest01;
    public Integer insertRole(String role_name,String note){
        return userMapperTest01.insert(role_name, note);
    }
}

springboot整合多數據源及事物