java jar的动态加载和释放

    package com.zeus;  
      
    import sun.misc.ClassLoaderUtil;  
      
    import java.io.File;  
    import java.lang.reflect.Constructor;  
    import java.lang.reflect.Method;  
    import java.net.MalformedURLException;  
    import java.net.URL;  
    import java.net.URLClassLoader;  
      
    /** 
     * java jar的动态加载和释放 
     */  
    public class TestMain {  
      
      
        public static void main(String[] args) throws MalformedURLException, Exception {  
      
            System.out.println(new File(".").getAbsolutePath());  
            URLClassLoader urlClassLoader=new URLClassLoader(new URL[]{new URL("file:C:\\Users\\Administrator\\IdeaProjects\\test\\data.jar")});  
           Class classStudentServiceImpl=  urlClassLoader.loadClass("StudentServiceImpl");  
           Method method= classStudentServiceImpl.getMethod("getName",new Class[]{});  
            Constructor localConstructor = classStudentServiceImpl.getConstructor(new Class[] {});  
            Object instance = localConstructor.newInstance(new Object[] {});  
           Object ret= method.invoke(instance);  
            System.out.println(ret);  
      
            ClassLoaderUtil.releaseLoader(urlClassLoader);  
            while(true)  
            {  
                Thread.sleep(1000);  
                System.out.println("run");  
            }  
      
      
        }  
    }