ApplicationContextAware 获得不到Bean

a327369238 2016-08-09 11:40:52

写了一个类实现ApplicationContextAware去获取bean，完全是照着例子写的啊，怎么还是报空指针错误！代码如下：
web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xmlns="http://java.sun.com/xml/ns/javaee"

         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">



  <display-name>spring-test</display-name>

  <!-- spring config begin -->

  <context-param>

    <param-name>contextConfigLocation</param-name>

    <param-value>

      classpath*:config/spring/local/appcontext-*.xml

    </param-value>

  </context-param>

  <!-- end -->

  

  <listener>

    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

  </listener>



  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>



</web-app>

appcontext-service.xml(config/spring/local下，idea的Resource下)

<?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:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

                            ">

    <bean id="springTest" class="com.fcc.spring.test.SpringTest" />



    <bean id="helloWorld" class="com.fcc.spring.test.HelloWorld">

        <property name="message" value="Hello World!" />

    </bean>

</beans>

HelloWorld.java

package com.fcc.spring.test;



import java.io.Serializable;



public class HelloWorld implements Serializable{

    private String message;



    public String getMessage() {

        return message;

    }



    public void setMessage(String message) {

        this.message = message;

    }

}

SpringTest.java

package com.fcc.spring.test;



import org.springframework.beans.BeansException;

import org.springframework.context.ApplicationContext;

import org.springframework.context.ApplicationContextAware;



import javax.annotation.Resource;



public class SpringTest implements ApplicationContextAware{



    private static ApplicationContext applicationContext;





    public static void main(String[] args){

        HelloWorld obj = (HelloWorld)getBean("helloWorld");

        System.out.println("obj = " + obj);

        System.out.println("The message value is " + obj.getMessage());

    }



    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {

        System.out.println("applicationContext before : " + applicationContext);

        SpringTest.applicationContext = applicationContext;

    }

    public static ApplicationContext getApplicationContext(){

        return applicationContext;

    }

    public static Object getBean(String name) throws BeansException{

        System.out.println("applicationContext = " + applicationContext);

        return applicationContext.getBean(name);

    }

}

运行SpringTest的main方法报错：
applicationContext = null
Exception in thread "main" java.lang.NullPointerException
at com.fcc.spring.test.SpringTest.getBean(SpringTest.java:32)
at com.fcc.spring.test.ApplicationContextAwareTest.main(ApplicationContextAwareTest.java:8)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

Process finished with exit code 1

不知道哪里错了，我理了下顺序，应该是这样的啊，但是就是不知道为什么，实现了ApplicationContextAware接口，但Spring初始化时候不回去初始化那个SpringTest的bean，连setApplicationContext()方法都没进，是哪里配置错了？

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