Spring  ApplicationContextAware 接口的作用及使用方式

package org.example.cheney;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
public class DemoBean implements ApplicationContextAware {
    private HelloBean helloBean;
    public void print(String name) {
        // DemoBean 类中的处理逻辑
        System.out.println("[DemoBean]  Hi: " + name);
        // HelloBean 类中的处理逻辑
        helloBean.say(name);
    }
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        // 通过 ApplicationContext 来获取 HelloBean 的引用
        this.helloBean = applicationContext.getBean(HelloBean.class);
    }
}

package org.example.cheney;
public class HelloBean {
    public void say(String message) {
        System.out.println("[HelloBean] Hello: " + message);
    }
}

<?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">
       <bean id="helloBean" class="org.example.cheney.HelloBean"/>
       <bean id="demoBean" class="org.example.cheney.DemoBean"/>
</beans>

package org.example.cheney;
import org.springframework.context.support.AbstractXmlApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App {
    public static void main(String[] args) {
        String location = "applicationContext.xml";
        try (AbstractXmlApplicationContext context = new ClassPathXmlApplicationContext(location)) {
            // 从容器中获取 DemoBean
            DemoBean demoBean = context.getBean(DemoBean.class);
            // 调用 DemoBean 类中的 print 方法
            demoBean.print("cheney");
        }
    }
}