java读取txt文本,字符串截取

package com.test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class TextConvertor {

public static String convertingStr(String lineStr) {
  String retVal = "";
  return retVal;
}

public static String readPath = "C:\\Documents and Settings\\Administrator\\桌面http://www.cnblogs.com/coconut_zhang/admin/file://1.txt/";
public static String writePath = "C:\\Documents and Settings\\Administrator\\桌面http://www.cnblogs.com/coconut_zhang/admin/file://1-bak.txt/";

/**
  * @param args
  * @throws IOException
  */
public static void main(String[] args) throws IOException {
  File file = new File(readPath);
  if (!file.exists()) {
   System.out.println("File not exist!");
   System.exit(0);
  }
  BufferedReader br = new BufferedReader(new FileReader(readPath));
  BufferedWriter bw = new BufferedWriter(new FileWriter(writePath));
  String temp = "";
  while ((temp = br.readLine()) != null) {
   System.out.println(temp);
   int i = 0;
   for (i = 0; i < temp.length(); i++) {
    String subTemp = temp.substring(i, i + 1);
    if (subTemp.matches("[^\\x00-\\xff]")) {
     System.out.println(subTemp + ": true");
     break;
    } else
     System.out.println(subTemp + ": false");
   }
   if(i == temp.length())
    temp = temp.substring(0, i - 1) + "\t" + temp.substring(i);
   else
    temp += "\t ";
   bw.write(temp);
   bw.newLine();
  }
  bw.flush();
  br.close();
  bw.close();
}
}