如何从jar文件@autowire类的实现？

Question

我有一个简单的类，并希望使用@Autowired从numberHandler对象触发该方法。但是该对象为空。有任何想法吗？

@Component 
public class Startup implements UncaughtExceptionHandler { 

@Autowired 
private MyHandler myHandler; 

public static void main(String[] args) { 

    startup = new Startup(); 
    startup(args); 

} 

public static void startup(String[] args) { 

    startup = new Startup(); 

} 
private void start() { 
    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); 
    myHandler.run(); //NULL 
} 

的applicationContext.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:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:util="http://www.springframework.org/schema/util" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd 
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd"> 

<context:annotation-config /> 
<context:component-scan base-package="com.my.lookup"/> 

和实现类：

package com.my.lookup; 

@Component 
public class MyHandler implements Runnable { 

private static Logger LOGGER = LoggerFactory.getLogger(MyHandler.class); 

@Override 
public void run() { 

    // do something 
} 

我一定要明确在主类的ClassPathXmlApplicationContext定义applicationContext.xml中（）或者Spring有办法在我的classpat中自动识别它H？

Answer 1

问题是你正在实例化不是由Spring管理的Startup类。您需要从ApplicationContext获得由Spring管理的Startup实例。改变你的主要方法如下应该工作...

public static void main(String[] args) { 
    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); 
    startup = context.getBean(Startup.class); 
    startup.start(); 
} 

private void start() { 
    myHandler.run(); 
}