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public class ClassUtils {

//给一个接口，返回这个接口的所有实现类public static List
   
     getAllClassByInterface(Class c){    List
    
      returnClassList = new ArrayList
     
      (); //返回结果    //如果不是一个接口，则不做处理    if(c.isInterface()){        String packageName = c.getPackage().getName(); //获得当前的包名        try {            List
      
        allClass = getClasses(packageName); //获得当前包下以            及子包下的所有类            //判断是否是同一个接口            for(int i=0;i
       
         getClasses(String packageName)        throws ClassNotFoundException, IOException {    ClassLoader classLoader = Thread.currentThread()            .getContextClassLoader();    String path = packageName.replace('.', '/');    Enumeration
        
          resources = classLoader.getResources(path); List
         
           dirs = new ArrayList
          
           (); while (resources.hasMoreElements()) { URL resource = resources.nextElement(); dirs.add(new File(resource.getFile())); } ArrayList
           
             classes = new ArrayList
            
             (); for (File directory : dirs) { classes.addAll(findClasses(directory, packageName)); } return classes;}private static List
             
               findClasses(File directory, String packageName) throws ClassNotFoundException { List
              
                classes = new ArrayList
               
                (); if (!directory.exists()) { return classes; } File[] files = directory.listFiles(); for (File file : files) { if (file.isDirectory()) { assert !file.getName().contains("."); classes.addAll(findClasses(file, packageName + "." + file.getName())); } else if (file.getName().endsWith(".class")) { classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6))); } } return classes;}
               
              
             
            
           
          
         
        
       
      
     
    
   

}

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