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;/** * @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

<?xml version='1.0' encoding='UTF-8'?><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 class='com.rookie.bigdata.domain.User'> <property name='username' value='张三'></property> <property name='address' value='北京'></property> </bean> <bean 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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