如何使用Spring Aware标记接口

本文讲解"怎么使用Spring Aware标记接口"，用于解决相关问题。

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; /** * @author rookie * @version 1.0 * @date 2020/3/21 22:58 */ 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

<&#63;xml version="1.0" encoding="UTF-8"&#63;> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <bean id="user" class="com.rookie.bigdata.domain.User"> <property name="username" value="张三"></property> <property name="address" value="北京"></property> </bean> <bean id="springAware" class="com.rookie.bigdata.aware.SpringAware"></bean> </beans>

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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