1.文件结构：

2.pom：

<project xmlns="http://maven.apache.org/POM/4.0.0"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.itmayido</groupId>
   <artifactId>SpringBoot-data</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>1.5.10.RELEASE</version>
   </parent>
   <repositories>
       <repository>
           <id>alimaven</id>
           <name>aliyun maven</name>
           <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
       </repository>
   </repositories>
   <dependencies>
       <dependency>
           <groupId>commons-dbcp</groupId>
           <artifactId>commons-dbcp</artifactId>
           <version>1.4</version>
       </dependency>
       <dependency>
           <groupId>com.microsoft.sqlserver</groupId>
           <artifactId>sqljdbc4</artifactId>
           <version>4.0</version>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-jdbc</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-test</artifactId>
           <scope>test</scope>
       </dependency>
       <dependency>
           <groupId>org.mybatis.spring.boot</groupId>
           <artifactId>mybatis-spring-boot-starter</artifactId>
           <version>1.1.1</version>
       </dependency>
       
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-web</artifactId>
       </dependency>
       
       <dependency>
           <groupId>mysql</groupId>
           <artifactId>mysql-connector-java</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-configuration-processor</artifactId>
           <optional>true</optional>
       </dependency>
   </dependencies>
</project>

3.application.properties:

server.port是设置端口

4.DataSource1Config.java：

package com.itmayidu.datasource;

import javax.sql.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;

@Configuration//注册到springboot容器，相当于原来xml文件里的<beans>

//下面要进行扫包，目的是标清楚为谁添加的数据源，这样对应的包里函数执行数据库操作的时候，就知道要执行的数据库账号

//密码，表，以及事务处理之类的。
@MapperScan(basePackages= {"com.itmayidu.test01"},sqlSessionFactoryRef="test1SqlSessionFactory")
public class DataSource1Config {
   @Bean(name="test1DataSource")//注入到这个容器
   @ConfigurationProperties(prefix="spring.datasource.test1")//表示取application.properties配置文件中的前缀
   @Primary#primary是设置优先，因为有多个数据源，在没有明确指定用哪个的情况下，会用带有primary的，这个注解必须有一个数据源要添加
   public DataSource testDataSource() {
       return DataSourceBuilder.create().build();
   }

@Bean(name="test1SqlSessionFactory")
@Primary

//@Qualifier("xxx")的含义是告诉他使用哪个DataSource
   public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource) throws Exception {
       SqlSessionFactoryBean bean=new SqlSessionFactoryBean();
       bean.setDataSource(dataSource);
       return bean.getObject();
   }
   @Bean(name="test1TransactionManager")//配置事务
   @Primary
   public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
       return new DataSourceTransactionManager(dataSource);
   }
   @Bean(name="test1SqlSessionTemplate")
   @Primary
   public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
       return new SqlSessionTemplate(sqlSessionFactory);
   }
}