发送多张图片进行区分

当发送多张图片的时候，接收端很容易将几个数据流混在了一起，导致接收的无法分开。常见的方法是先传文件大小，再传文件。或者自定义结束符，当接收到结束符后客户端自动区分开各个文件。

我用的第一个。代码如下：

server端:

for(int i=0;i<2;i++)

{

 

  try {

  

File file = new File(str[i]);

FileInputStream input = new FileInputStream(file);

//首先发送文件长度

System.out.println(file.length());

writer.println((int) file.length());

writer.flush();

byte[] buffer=new byte[1];

try {

int num= input.read(buffer);

OutputStream output = ClientSocket.getOutputStream();

OutputStream sendStream = new DataOutputStream(new BufferedOutputStream(output));

         while(num!=-1)

{

sendStream.write(buffer, 0,num);

sendStream.flush();

num=input.read(buffer);

}

//                 sendStream.write('\r');

          sendStream.write('\n');

         

          sendStream.flush();

       input.close();

 } catch (IOException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

client端:

while(true)

 {

i++;

if(i==3)

{

break;

}

 

 try {

   byte[] buffer = new byte[1];

        File file= new File(i+".jpg");

        file.createNewFile();

        

        InputStream input = socket.getInputStream();

   InputStream mess=new DataInputStream(new BufferedInputStream(input));

   

   int size=Integer.parseInt(reader.readLine());

System.out.println("即将接收的图片大小为： "+size);

 

   

RandomAccessFile recv = new RandomAccessFile(file,"rw");

   int num = mess.read(buffer);

int RecvSize=0;

while(num!=-1&&(RecvSize

   {  

RecvSize+=num;

recv.write(buffer,0,num);

    recv.skipBytes(num);

    num=mess.read(buffer);

//     System.out.print("收到数据量: "+RecvSize);

   }  

System.out.print("i am out");

System.out.println("共收到: "+RecvSize);

recv.close();

} catch (IOException e){

// TODO Auto-generated catch block

e.printStackTrace();

}

}

 } catch (IOException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

     }

}