Spring Aware标记接口使用案例解析

Aware接口是一个标记接口

XXXAare在Spring中表示对XXX可以感知，通俗点解释就是：如果在某个类里面想要使用Spring的一些东西，就可以通过实现XXXAware接口告诉Spring,Spring看到后就会送过来，而接受的方式是通过实现接口唯一的方法setXXX.比如ApplicationContextAware

ApplicationContextAware使用

编写SpringAware实现ApplicationContext接口

package com.rookie.bigdata.aware;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;



public class SpringAware implements ApplicationContextAware {

  private ApplicationContext applicationContext;
  
  //Spring容器会将ApplicationContext对象传入过来
  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    System.out.println("传入的IOC容器applicationContext = [" + applicationContext + "]");
    this.applicationContext = applicationContext;
  }
  
  public ApplicationContext getApplicationContext() {
    return applicationContext;
  }


}

User实体类

package com.rookie.bigdata.domain;

public class User {
  private String username;
  private String address;

  public String getUsername() {
    return username;
  }
  
  public void setUsername(String username) {
    this.username = username;
  }
  
  public String getAddress() {
    return address;
  }
  
  public void setAddress(String address) {
    this.address = address;
  }

}

spring-aware.xml

测试类

	 @Test
  public void test1(){
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("/aware/spring-aware.xml");

//    User user = (User) applicationContext.getBean("user");
//    System.out.println(user);

    SpringAware springAware = (SpringAware) applicationContext.getBean("springAware");
    ApplicationContext applicationContext1 = springAware.getApplicationContext();
    User user = (User) applicationContext1.getBean("user");
    System.out.println(user);
  }

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