spring Environment

spring获取Environment

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.16.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.16.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.3.16.RELEASE</version>
    </dependency>

package com.test.spring;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;

public class MyTest {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(MyConfig.class);
        Demo demo = context.getBean(Demo.class);
        Environment environment = demo.getEnvironment();
        String java_home = environment.getProperty("JAVA_HOME");
        System.out.println(java_home);
    }
}
@Configuration
class MyConfig {
    @Bean
    public Demo demo() {
        return new Demo();
    }
}
class Demo {
    @Autowired
    private Environment environment;

    public void setEnvironment(Environment environment) {
        this.environment = environment;
    }

    public Environment getEnvironment() {
        return environment;
    }
}