个回答

• suyanggg

  2016-04-12 13:28:05

  已采纳

  package com.cuit.suyang;

  
  

  import java.io.File;

  import java.io.FileInputStream;

  import java.io.FileOutputStream;

  import java.io.IOException;

  import java.io.InputStreamReader;

  import java.io.OutputStreamWriter;

  
  

  public class Initial_ {

  public static void main(String[] args) throws IOException {

  InputStreamReader in = new InputStreamReader(new FileInputStream(new File("dir\\a.txt")));

  int c;

  StringBuilder string = new StringBuilder();

  while((c = in.read()) != -1)

  string.append((char)c);

  System.out.println(string);

  String _string = new String(string.toString()); //将StringBuilder 转换为 Stirng

  _string = _string.replaceAll("336", "330");  //替换相应的字符

  OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(new File("dir\\a.txt")));

  out.write(_string); //写入原文件

  out.flush();

  out.close();

  }

  }

  
  

  0