java工具类之实现java获取文件行数

工具类代码，取得当前项目中所有java文件总行数，代码行数，注释行数，空白行数

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);
 }
}