Example of ApplicationContextAware in Spring--转

原文地址：http://www.concretepage.com/spring/example_applicationcontextaware_spring

In spring we can get ApplicationContext anywhere in our code with the help of ApplicationContextAware. ApplicationContextAware is the interface and there is only one method setApplicationContext() in it. When a class implements ApplicationContextAware, that class needs to override the setApplicationContext() method. ApplicationContextAware is used for bean lookup purpose and for those objects which needs to access file resources. Find the example below.

Implement ApplicationContextAware Interface

ApplicationContextAwareTest.java

package com.concretepage;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
public class ApplicationContextAwareTest implements ApplicationContextAware  {
	ApplicationContext context;
	public ApplicationContext getContext() {
		return context;
	}
	@Override
	public void setApplicationContext(ApplicationContext context)
			throws BeansException {
		this.context=context;
	}
}

 

Configure Bean

app-conf.xml

<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-3.0.xsd ">
  
    <bean id="testA" class="com.concretepage.A"/>
    <bean id="appcontext" class="com.concretepage.ApplicationContextAwareTest"/>
</beans>

A.java

package com.concretepage;
public class A {
	public void doTask(){
		System.out.println("Do some task.");
	}
}

Run Demo

SpringTest.java

package com.concretepage;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SpringTest {
	public static void main(String[] args) {
		AbstractApplicationContext  context = new ClassPathXmlApplicationContext("app-conf.xml");
		ApplicationContextAwareTest appcontext= (ApplicationContextAwareTest)context.getBean("appcontext");
		ApplicationContext appCon =appcontext.getContext();
		A a= (A)appCon.getBean("testA");
		a.doTask();
		context.registerShutdownHook();
	}
}

Find the output.

Do some task.