一、建立Service接口（Service.java）：
package service;
public interface Service ...{
public void start(); public void shutdown();
}
二、建立接口的实例化应用（AppDemo.java）：
package application;import service.Service;public class AppDemo implements Service ...{
public void shutdown() ...{ System.out.println("关闭");
} public void start() ...{ System.out.println("启动"); }}
三、将AppDemo.java导出为Jar包，并将其放置在工程的application目录下。
四、新建Jar包加载类（JarLoader.java）：
package loader;import java.net.MalformedURLException;import java.net.URL;import java.net.URLClassLoader;public class JarLoader extends URLClassLoader ...{ private static JarLoader loader = null; private JarLoader()...{ super(new URL[0], JarLoader.class.getClassLoader()); } public static JarLoader getInstance()...{ if(loader==null) loader = new JarLoader(); return loader; } public void addURL(String url) throws MalformedURLException ...{ this.addURL(new URL(url)); }}
五、测试一下：
package test;
import java.net.MalformedURLException;
import service.Service;
import loader.JarLoader;
public class Test ...{
/** *//**
* @param args
*/
public static void main(String[] args) ...{
JarLoader loader = JarLoader.getInstance();
try ...{
loader.addURL("jar:file:///"+System.getProperty("user.dir")
+ "/application/app1.jar" + "!/");
Service serv = (Service)Class.forName("application.AppDemo", true, loader).newInstance();
serv.start();
serv.shutdown();
} catch (MalformedURLException e) ...{
e.printStackTrace();
} catch (InstantiationException e) ...{
e.printStackTrace();
} catch (IllegalAccessException e) ...{
e.printStackTrace();
} catch (ClassNotFoundException e) ...{
e.printStackTrace();
}
}
}
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