Detailed explanation of @Profile annotation

@Profile: Spring provides us with the function of dynamically activating and switching a series of components according to the current environment;

Development environment develop, test environment test, production environment master

Data source: (/dev) (/test) (/master)

@Profile: Specify the environment in which the component can be registered In the container, without specifying, this component can be registered in any environment

1) A bean with an environment identifier can only be registered in the container when the environment is activated. The default is the default environment

2) Written in the configuration class, only in the specified environment can all configurations in the entire configuration class take effect

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();
	}
}

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