多环境切换

java配置使用profile

@Profile设置在某个环境下，spring注入对应的bean

public class JavaConfig {@Bean@Profile("dev")DataSource devDs(){DataSource ds = new DataSource();ds.setUrl("dev");ds.setUsername("dev");return ds;}@Bean@Profile("prod")DataSource prodDs(){DataSource ds = new DataSource();ds.setUrl("prod");ds.setUsername("prod");return ds;}
}

启动环境的时候，不要先传递配置文件，，一旦传入了配置文件，，spring默认就会初始化容器，，但是还没有设置系统的环境，，

   public static void main(String[] args) {// 添加配置类会  初始化容器
//        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(JavaConfig.class);AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();// 设置环境ctx.getEnvironment().addActiveProfile("prod");// 设置配置类ctx.register(JavaConfig.class);// 初始化容器ctx.refresh();DataSource bean = ctx.getBean(DataSource.class);System.out.println("bean = " + bean);}

xml使用profile

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><beans profile="dev"><bean class="com.cj.Dog" id="dog"><property name="name" value="小黑"/></bean></beans><beans profile="prod"><bean class="com.cj.Dog" id="dog"><property name="name" value="小白"/></bean></beans></beans>

    @Testpublic void test(){ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext();ctx.getEnvironment().setActiveProfiles("dev");ctx.setConfigLocation("profile-beans.xml");ctx.refresh();Dog dog = ctx.getBean(Dog.class);System.out.println("dog = " + dog);}

@Profile实现

@Profile 本质上是一个条件注解

自定义一个Profile

package com.cj.profile02;import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.env.Profiles;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.util.MultiValueMap;import java.util.Arrays;
import java.util.List;/*** @author cc* @date 2024-06-19 20:08**/public class MyProfileCondition implements Condition {@Overridepublic boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {MultiValueMap<String, Object> allAttrs = metadata.getAllAnnotationAttributes(MyProfile.class.getName());if (allAttrs !=null){// 拿到value传的值,,,,   传的环境值是个数组List<Object> value = allAttrs.get("value");value.forEach(System.out::println);for (Object val : value) {// 判断是否是系统环境boolean b = context.getEnvironment().acceptsProfiles(Profiles.of(((String[]) val)));if (b){return true;}}}return false;}
}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@Conditional(MyProfileCondition.class)
public @interface MyProfile {String[] value();
}