import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class test {
	 public static void main(String[] args) {  
	        String packageName = "com.loygra.lsm.service.impl.gumi.task";  
	  
	        List<String> classNames = getClassName(packageName);  
	        for (String className : classNames) {  
	            System.out.println(className);  
	        }  
	    }  
	  
	    public static List<String> getClassName(String packageName) {  
	        String filePath = ClassLoader.getSystemResource("").getPath() + packageName.replace(".", "\\");  
	        List<String> fileNames = getClassName(filePath, null);  
	        return fileNames;  
	    }  
	  
	    private static List<String> getClassName(String filePath, List<String> className) {  
	        List<String> myClassName = new ArrayList<String>();  
	        File file = new File(filePath);  
	        File[] childFiles = file.listFiles();  
	        for (File childFile : childFiles) {  
	            if (childFile.isDirectory()) {  
	                myClassName.addAll(getClassName(childFile.getPath(), myClassName));  
	            } else {  
	                String childFilePath = childFile.getPath();
	                int startPos = childFilePath.indexOf("\\classes") + 9;
	                if(startPos==8) {
	                	startPos= childFilePath.indexOf("\\bin") + 5;
	                }
	                childFilePath = childFilePath.substring(startPos, childFilePath.lastIndexOf("."));  
	                childFilePath = childFilePath.replace("\\", ".");  
	                myClassName.add(childFilePath);  
	            }  
	        }  
	  
	        return myClassName;  
	    }  
}