java工具类之实现java获取文件行数

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 *
 * @author Administrator
 *
 */
public class JavaCode {
 private static final String PROJECT_DIR = "C:\\test";
 private static int totle = 0;  //总行数    
 private static int source  = 0;  //代码行数   
 private static int blank  = 0;  //空白行数    
 private static int comments = 0; //注释行数

 /**
  * 读取文件夹内java文件
  * @param dir
  */
 private static void listNext(File dir) {
  File[] files = dir.listFiles();
  for (int i = 0; i < files.length; i++) {
   //判断是否是文件夹，如果是文件夹继续向下检索
   if (files[i].isDirectory()) {
    listNext(files[i]);
   } else {
    try {
     if (files[i].getName().endsWith(".java")) {
      System.out.println(files[i].getAbsolutePath());
      javaLine(files[i]);
     }
    }catch (Exception e) {
     e.printStackTrace();
    }
   }
  }
 }

 /**
  * 读取java文件总行数，代码行数，空白行数，注释行数
  * @param f
  * @throws IOException
  * @throws FileNotFoundException
  */
 private static void javaLine(File f) throws FileNotFoundException, IOException{
  String strLine = "";
  String str = fromFile(f);
  if (str.length() > 0) {
   while (str.indexOf('\n') != -1) {
    totle++;
    //System.out.println(totle);
    strLine = str.substring(0, str.indexOf('\n')).trim();
    //str = str.substring(str.indexOf('\n') + 1, str.length());
    if (strLine.length() == 0 ) {
     blank++;
    }else if (strLine.charAt(0) == '*' || strLine.charAt(0) == '/') {
     comments++;
    }else{
     source++;
     String regEx = "^*//";
     if(regEx(strLine,regEx)){
      comments++;
     }
    }
    str = str.substring(str.indexOf('\n') + 1, str.length());
   }
  } 
 }

 /**
  * 将java文件以字符数组形式读取
  * @param f
  * @return
  * @throws FileNotFoundException
  * @throws IOException
  */
 private static String  fromFile(File f) throws FileNotFoundException,IOException {
  FileInputStream fis = new FileInputStream(f);
  byte[] b = new byte[(int) f.length()];
  fis.read(b);
  fis.close();
  return new String(b);
 }

 /**
  * 正则匹配
  * @param str 输入字符串
  * @param regEx 正则匹配字符串
  * @return
  */
 private static boolean regEx(String str,String regEx){
  Pattern p=Pattern.compile(regEx);
  Matcher m=p.matcher(str);
  boolean result=m.find();
  return result;
 }
 public static void main(String[] args) throws FileNotFoundException, IOException {
  //File root = new File(PROJECT_DIR);
  File directory = new File("");//参数为空
  //获取项目路径
  String projectFile = directory.getCanonicalPath() ;
  System.out.println(projectFile+"===============");
  listNext(new File(projectFile));
  System.out.println(totle+1);
  System.out.println(source);
  System.out.println(blank);
  System.out.println(comments);
 }
}