Java 字节流读写文件

import java.io.*;
class Test{
    public static void main(String args[]){
        FileInputStream fis = null;
        FileOutputStream fos = null;
        byte[] buffer = new byte[100];
        int temp = 0;
        try{
            fis = new FileInputStream("D:/wenhao/src/from.txt");
            fos = new FileOutputStream("D:/wenhao/src/to.txt");
            while(true){
                temp = fis.read(buffer,0,buffer.length);
                if(temp == -1){
                    break;
                }
                fos.write(buffer,0,temp);
            }        
        }
        catch(Exception e){
            System.out.println(e);
        }
        finally{
            try{
                fis.close();
                fos.close();
            }
            catch(Exception e2){
                System.out.println(e2);
            }
        }

    }
}