这里只是简单的去实现一个项目中可能会引入多个数据源的情况，这里只是简单的去实现多个数据源的情况

我这里使用的是druid的数据源，需要引入依赖

        <dependency>
            <groupId>com.github.drtrang</groupId>
            <artifactId>druid-spring-boot2-starter</artifactId>
            <version>1.1.10</version>
        </dependency>

配置文件:jdbc.properties

#这里面两个数据库连接随便写的，只是为了实现多个数据源

#数据库1
dev.driverClassName=111111111
dev.url=111111111
dev.username=111111111
dev.password=111111111

#数据库2
uat.driverClassName=222222222
uat.url=222222222
uat.username=222222222
uat.password=222222222

接下来就是两个配置数据源，基于@Bean注解放入ioc容器中，需要注意的是：设置的第一个数据源的bean的name属性值必须为dataSource，否则就会报错

第一个配置数据源的代码：JdbcConfiguration01.java

package com.shenlong.demo.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.shenlong.demo.pojo.TestDemo;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

import javax.sql.DataSource;

@Configuration
@PropertySource("classpath:jdbc.properties")
public class JdbcConfiguration01 {

    @Value("${dev.driverClassName}")
    private String driverClassName;

    @Value("${dev.url}")
    private String url;

    @Value("${dev.username}")
    private String username;

    @Value("${dev.password}")
    private String password;

    @Bean(name = "dataSource")//注意这里必须有个为dataSource
    public DataSource getDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setDriverClassName(driverClassName);
        druidDataSource.setUrl(url);
        druidDataSource.setUsername(username);
        druidDataSource.setPassword(password);
        return druidDataSource;
    }

    @Override
    public String toString() {
        return "JdbcConfiguration01{" +
                "driverClassName='" + driverClassName + '\'' +
                ", url='" + url + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

第二个配置数据源的代码：JdbcConfiguration02.java

package com.shenlong.demo.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

import javax.sql.DataSource;

@Configuration
@PropertySource("classpath:jdbc.properties")
public class JdbcConfiguration02 {

    @Value("${uat.driverClassName}")
    private String driverClassName;

    @Value("${uat.url}")
    private String url;

    @Value("${uat.username}")
    private String username;

    @Value("${uat.password}")
    private String password;

    @Bean(name = "uatDataSource")//这里的bean可以随便写了
    public DataSource getDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setDriverClassName(driverClassName);
        druidDataSource.setUrl(url);
        druidDataSource.setUsername(username);
        druidDataSource.setPassword(password);
        return druidDataSource;
    }

    @Override
    public String toString() {
        return "JdbcConfiguration02{" +
                "driverClassName='" + driverClassName + '\'' +
                ", url='" + url + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

上面配置的两个数据源，需要注意的是，如果需要引入这两个数据源，需要对应的去获取IOC各自的bean name属性值，即：

JdbcConfiguration01.java里面是@Bean(name = "dataSource")，引入的时候，名称同样要用到dataSource。即：

@Autowired
private DataSource dataSource;

JdbcConfiguration02.java里面是@Bean(name = "uatDataSource")，引入的时候，名称同样要用到uatDataSource。

@Autowired
private DataSource uatDataSource;

可以使用测试类debug查看对应的数据源的值

测试类代码如下：

package com.shenlong.demo;

import com.shenlong.demo.config.JdbcConfiguration01;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.sql.DataSource;

@RunWith(SpringRunner.class)
@SpringBootTest
class SpringbootDemoApplicationTests {

    @Autowired
    private JdbcConfiguration01 jdbcConfiguration;

    @Autowired
    private DataSource dataSource;

    @Autowired
    private DataSource uatDataSource;

    @Test
    public void test(){

        System.out.println(dataSource);
        System.out.println(uatDataSource);
        System.out.println(jdbcConfiguration);

    }


}

,下面是各自的数据源获取的值：