import java.io.*; import java.net.*; /* *發送端 */ class picsend {   public static void main(String[] args) throws Exception   {     if(args.length!=1)     {       System.out.println("請選擇一張.jpg圖片");       return;     }     File file = new File(args[0]);     if (!(file.exists() && file.isFile()))     {       System.out.println("圖片有問題(不是文件或不存在)");       return;     }     if(!file.getName().endsWith(".jpg"))     {       System.out.println("圖片格式不對，請重新選擇圖片");       return;     }     if(file.length()>1024*1024*10)     {       System.out.println("圖片過大，無法上傳");       return;     }      Socket s = new Socket("192.168.33.1",10006);//建立服務     FileInputStream fis = new FileInputStream("d://美女.jpg");//讀取圖片     OutputStream out = s.getOutputStream();//讀到的寫入     byte [] b = new byte[1024];     int len = 0;     while((len = fis.read(b))!= -1)     {       out.write(b,0,len);     }     s.shutdownOutput();//標記結束     InputStream in = s.getInputStream();//讀服務端返回數據     byte [] bin = new byte[1024];     int num = in.read(bin);     System.out.println(new String(bin,0,num));     fis.close();     s.close();   } } class picThread implements Runnable  {   private Socket s;   picThread(Socket s)   {     this.s = s;   }   public void run()   {     int count = 1;     String ip = s.getInetAddress().getHostAddress();//得到ip     try     {       System.out.println(ip+".............connect");       InputStream in = s.getInputStream();//讀到流中數據       File file = new File(ip+"("+(count)+")"+".jpg");       while(file.exists())//判斷文件是否存在         file = new File(ip+"("+(count++)+")"+".jpg");        FileOutputStream fos = new FileOutputStream(file);//寫入       byte [] b = new byte[1024];       int len = 0;       while((len = in.read(b))!=-1)       {         fos.write(b,0,len);       }       OutputStream out = s.getOutputStream();//寫入服務端傳過來數據       out.write("上傳成功！".getBytes());       fos.close();       s.close();     }     catch (Exception e)     {       throw new RuntimeException("上傳失敗");     }          } } /* *服務端 */ class picrece  {   public static void main(String[] args) throws Exception   {     ServerSocket ss = new ServerSocket(10006);     while(true)     {       Socket s = ss.accept();//接收       new Thread(new picThread(s)).start();     }   } }