参考这程序吧
/*
* c7:IODemo4.java 1.0 05/02/10
* author:Leo
* This program is protected by copyright laws.
* Reader from and write to files.
* 字符流和字节流类似,但效率更高.有可能的情况下,尽量使用reader和writer
* 一般只要把Reader替换为InputStream,用Writer 替换OutputStream,当然还要用Char替换Byte.
* 用reader和writer可以一次读一行,而且没有类型转换的麻烦 .
*/

package myprojects.readerwriter;

import java.io.*;

class IODemo4
{
public static void main(String args[])
{
System.out.println(“Starting reader...“);
String s = new String();
String s2=new String();
try
{
BufferedReader in = new BufferedReader(new FileReader(“d:\\classtry\\My.class“));
PrintWriter out = new PrintWriter(new FileWriter(“d:\\classtry\\destnation.xls“));
//BufferedReader in2 = new BufferedReader(new FileReader(“d:\\javatry\\classtry\\destnation.xls“));



//把下面的字符串写入到文件的第一行.


//out.println(“the following is from source“);
//下面的循环语句读入一行内容的同时进行写入.
while((s=in.readLine()) != null)
{
System.out.println(s);
//char ss[]=s.toCharArray();
out.println(s+“\t“);
}
//in2.close();
in.close();
out.close();//关闭文件.

}
catch(Exception e)
{
e.printStackTrace();
}
}
}