文件之间的拷贝

package org.file.test;

import java.io.*;

class FileInOut
{
    public static void main(String args[]) throws Exception
    {
        System.out.println("从键盘输入文件内容，以回车结束：");
        char c;
        StringBuffer buf=new StringBuffer();
        try
        {
            while((c=(char)System.in.read())!=' ')
            buf.append(c);
        }
        catch(java.io.IOException e)
        {
            e.printStackTrace();
        }
        
        byte b[]=buf.toString().trim().getBytes();
        FileOutputStream f1=new FileOutputStream("file1.txt");
        f1.write(b);
        f1.close();
        
        FileInputStream f2=new FileInputStream("file1.txt");
        FileOutputStream f3=new FileOutputStream("file2.txt");
        int c2;
        while((c2=f2.read())!=-1)
        {
            f3.write(c2);
        }
        f2.close();
        f3.close();
    }
}