计算一个项目工程中所有包下面的代码行数

import java.io.File;

import jodd.io.FileUtil;
public class Test {
 public static void main(String[] args) throws Exception {
  File root = new File("E:/MyEclipse 9/");
  showAllFiles(root);
  System.out.println(n);
 }
 static int n;
 final static void showAllFiles(File dir) throws Exception{
  File[] fs = dir.listFiles();
  for(int i=0; i<fs.length; i++){
   System.out.println(fs[i].getAbsolutePath());
   if(fs[i].getAbsolutePath().endsWith(".java")){
	   String[] str = FileUtil.readLines(fs[i].getAbsolutePath()); 
	   for(String s:str){
	    	if(s.length()>0){
				n++;
				//System.out.println(s);
	    	 }
	     }
   }
   if(fs[i].isDirectory()){
    try{
     showAllFiles(fs[i]);
    }catch(Exception e){}
   }
  }
 }
}