Spring @Profile注解详解

@Profile注解详解

@Profile:Spring为我们提供的可以根据当前环境，动态的激活和切换一系列组件的功能；

开发环境develop、测试环境test、生产环境master

数据源：(/dev) (/test) (/master)

@Profile:指定组件在哪个环境的情况下才能被注册到容器中，不指定，任何环境下都能注册这个组件

1) 加了环境标识的bean，只有这个环境被激活的时候才能注册到容器中。默认是default环境
2) 写在配置类上，只有是指定的环境的时候，整个配置类里面的所有配置才能开始生效  

package com.spring.config;

import java.beans.PropertyVetoException;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.EmbeddedValueResolverAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
import org.springframework.context.annotation.PropertySource;
import org.springframework.util.StringValueResolver;

import com.mchange.v2.c3p0.ComboPooledDataSource;

/**
* Profile:
* Spring为我们提供的可以根据当前环境，动态的激活和切换一系列组件的功能；
*
* 开发环境develop、测试环境test、生产环境master
* 数据源：(/dev) (/test) (/master)
*
* @Profile:指定组件在哪个环境的情况下才能被注册到容器中，不指定，任何环境下都能注册这个组件
*
* 1) 加了环境标识的bean，只有这个环境被激活的时候才能注册到容器中。默认是default环境
* 2) 写在配置类上，只有是指定的环境的时候，整个配置类里面的所有配置才能开始生效
*
*/
@PropertySource("classpath:/dbconfig.properties")
@Configuration
public class MainConfigOfProfile implements EmbeddedValueResolverAware{

@Value("${db.user}")
private String user;

private String driverClass;

@Profile("default")
@Bean("test")
public DataSource testDataSource(@Value("${db.password}")String password) throws PropertyVetoException {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setUser(user);
dataSource.setPassword(password);
dataSource.setDriverClass(driverClass);
return dataSource;
}

@Profile("dev")
@Bean("dev")
public DataSource devDataSource(@Value("${db.password}")String password) throws PropertyVetoException {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setUser(user);
dataSource.setPassword(password);
dataSource.setDriverClass(driverClass);
return dataSource;
}

@Profile("master")
@Bean("master")
public DataSource masterDataSource(@Value("${db.password}")String password) throws PropertyVetoException {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setUser(user);
dataSource.setPassword(password);
dataSource.setDriverClass(driverClass);
return dataSource;
}

public void setEmbeddedValueResolver(StringValueResolver resolver) {
String driverClass = resolver.resolveStringValue("${db.driverClass}");
this.driverClass = driverClass;
}

}

package com.spring.test;

import java.util.Arrays;

import javax.sql.DataSource;

import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.spring.config.MainConfigOfProfile;

public class IOCTestProfile {
//1. 使用命令行动态参数：在虚拟机参数位置加载 -Dspring.profiles.active=test
//2. 使用代码的方式激活某种环境；
@Test
public void test01() {
AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfigOfProfile.class);
//1. 创建一个applicationContext
//2. 设置需要激活的环境
applicationContext.getEnvironment().setActiveProfiles("dev","master");
//3. 注册主配置类
applicationContext.register(MainConfigOfProfile.class);
//4. 启动刷新容器
applicationContext.refresh();

String[] beanNamesForType = applicationContext.getBeanNamesForType(DataSource.class);
System.out.println(Arrays.toString(beanNamesForType));

applicationContext.close();
}

@Test
public void test02() {
AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfigOfProfile.class);

String[] beanNamesForType = applicationContext.getBeanNamesForType(DataSource.class);
System.out.println(Arrays.toString(beanNamesForType));

applicationContext.close();
}
}

来源：https://blog.csdn.net/ysl19910806/article/details/91646554