（圖片等）文件流的字節byte傳播

 package io_for_pic;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

public class FileIo {

//讀取C:/001.jpg圖片轉換爲字節byte[]數組

public byte[] inp() throws Exception{

File f = new File("C:/001.jpg");

InputStream is = new FileInputStream(f);

byte[] bt = new byte[(int)f.length()];

is.read(bt);

is.close();

System.out.println(bt);

return bt;

}

        //根據字節byte[]數組轉換爲圖片002.jpg保存在C盤下 

public void op(byte[] bt) throws Exception{

OutputStream os = new FileOutputStream(new File("c:/002.jpg"));

os.write(bt);

os.flush();

os.close();

}

public static void main(String[] args) throws Exception{

FileIo ips = new FileIo();

ips.op(ips.inp());

}

}