找了很久才找到的使用用内存流读写文件的代码，一起分享一下吧：

import java.io.*;
public class Text {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
   try{
     
      File read = new File("e:\\1.txt");
      File write = new File("e:\\2.txt");
     
      BufferedReader br = new BufferedReader(
            new FileReader(read));
      BufferedWriter bw = new BufferedWriter(
            new FileWriter(write));
      String temp = null;
      temp = br.readLine();
      while(temp != null){
       //写文件
       bw.write(temp + "\r\n"); //只适用Windows系统
       //继续读文件
       temp = br.readLine();
      }
     
      bw.close();
      br.close();
     
     }catch(FileNotFoundException e){ //文件未找到
      System.out.println (e);
     }catch(IOException e){
      System.out.println (e);
     }

 }