读取硬盘下多少行Java代码

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

/**
* des：
* author: zbl
* date: 2014年12月17日
**/
public class MathTest {

static int line = 0;
public static void main(String[] args) {
// TODO Auto-generated method stub
String rootUrl = "F:\\wp\\";
Recurisive(rootUrl);
System.out.println(line);
}

private static void Recurisive(String rootUrl) {
// TODO Auto-generated method stub
File file = new File(rootUrl);

File files[] = file.listFiles();
try {
for (int i = 0; i < files.length; i++) {
if(files[i].isDirectory()==true){
Recurisive(rootUrl+files[i].getName()+"\\");
}else{
if(files[i].getName().endsWith(".java")){
File f = new File(rootUrl+files[i].getName());
FileReader fr = new FileReader(f);
BufferedReader br = new BufferedReader(fr);
String str = null;
while((str = br.readLine())!=null){
line++;
System.out.println(line+":"+str);
}
br.close();
}
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}