<?xml version="1.0" encoding="UTF-8"?>
<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>top.zekk</groupId>
	<artifactId>two-datasource</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>two-datasource</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.8.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<!--<dependency>-->
			<!--<groupId>org.springframework.boot</groupId>-->
			<!--<artifactId>spring-boot-starter-data-jpa</artifactId>-->
		<!--</dependency>-->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

package top.zekk.twodatasource.config;


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.core.JdbcTemplate;

import javax.sql.DataSource;


@Configuration
public class DataSourceConfig {

    @Bean(name = "primaryDataSource")

//    @Qualifier("primaryDataSource")//原博主這裏加上@Qualify 沒有必要 刪了也沒有影響
    @ConfigurationProperties("spring.datasource.primary")
    public DataSource primaryDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean(name = "secondaryDataSource")

//    @Qualifier("secondaryDataSource") //原博主這裏加上@Qualify 沒有必要 刪了也沒有影響
    @ConfigurationProperties("spring.datasource.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();
    }


    /**
     * @param dataSource
     * @return
     * @Bean明確地指示了一種方法，什麽方法呢——產生一個bean的方法， 並且交給Spring容器管理；從這我們就明白了為啥@Bean是放在方法的註釋上了，
     * 因為它很明確地告訴被註釋的方法，你給我產生一個Bean，然後交給Spring容器，
     * 實現依賴註入
     */
    @Bean(name = "primaryJdbcTemplate")
    public JdbcTemplate primaryTemplate(@Qualifier("primaryDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    @Bean(name = "secondaryJdbcTemplate")
    public JdbcTemplate secondaryTemplate(@Qualifier("secondaryDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }


}

測試 通過測試主鍵判斷數據源是否配置成功

package top.zekk.twodatasource;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class TwoDatasourceApplicationTests {

	@Autowired
	/*@Qualify 多個同類型bean?存在時  Spring不知道應該綁定哪個實現類
	指定綁定的類名@Bean(name="**")
	*/
	@Qualifier("primaryJdbcTemplate")
	protected JdbcTemplate jdbcTemplate1;

	@Autowired
	//@Qualify 多個同類型bean?存在時 指定綁定的類名@Bean(name="**")
	@Qualifier("secondaryJdbcTemplate")
	protected JdbcTemplate jdbcTemplate2;

	@Before //首先執行清空數據庫操作
	public void setUp(){
		jdbcTemplate1.update("DELETE FROM USER ");
		jdbcTemplate2.update("DELETE FROM USER ");
	}

	@Test
	public void test(){
		jdbcTemplate1.update
				("INSERT INTO USER (id,name,age) VALUES (?,?,?)",1,"aaa",20);
		jdbcTemplate2.update
				("INSERT INTO USER (id,name,age) VALUES (?,?,?)",1,"bbb",30);
		jdbcTemplate2.update
				("INSERT INTO USER (id,name,age) VALUES (?,?,?)",2,"bbb",31);

		Assert.assertEquals("1",jdbcTemplate1.queryForObject("select count(1) from user",String.class));

		Assert.assertEquals("2",jdbcTemplate2.queryForObject("select count(1) from user",String.class));
	}

}

　　數據庫

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

JdbcTemplate 配置多數據源(完全照抄,完整)