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);
}

}