如何将NSData读取到用Java编写的客户端中

Question

I create an iOS server using GCDAsyncSocket and Client is created using Java language. When I sent data in form of NSDAta it can be read by SocketTester(application for testing client connection) but it cannot be completely read at java end .

static void   recorderServerClient() throws  IOException{
    int port =9892;
        clientSocket = new Socket("localhost", port);
        System.out.print("Connected to localhost"+port);

        while (true){
        InputStream inputStream = clientSocket.getInputStream();
        try {
            Thread.sleep(3000);
            }
         catch (InterruptedException e) {
            e.printStackTrace();
        }/*fetch data with help of output stream and write it with help of PrintWriter */
      PrintWriter printWriterObj = new PrintWriter(clientSocket.getOutputStream()); 
          printWriterObj.println();
            printWriterObj.flush();
           /*created an array for now static and assign some memory */              byte[] buffer = new byte[1000000];
            int read;
            while((read = inputStream.read(buffer)) != -1) {
                String output = new String(buffer, 0, read);
               System.out.print(output);
                System.out.flush();
            }
        }
        */

}

I want to get data length sent through ios server.and create buffer accordingly.Can any one help me out?

Answer 1

import java.io.*;
import java.net.Socket;

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

        Socket socket = new Socket("localhost", 2100);
        System.out.println("Connected");

        DataInputStream ins = new DataInputStream(socket.getInputStream());
        DataOutputStream  out = new DataOutputStream(socket.getOutputStream());
        System.out.println("opened OutputStreams");

        System.out.println(readResponse(ins));
        Thread.sleep(100);
        out.write("ss 1\n".getBytes());//send command
        out.flush();
        System.out.println("sent command");
        Thread.sleep(3000);//important to wait for the server to response
        System.out.println(readResponse(ins));
        socket.close();
        System.out.println("Connection to the server closed");
    }

    private static String readResponse(InputStream in) throws IOException {
        byte[] buf = new byte[1024];//1k
        StringBuilder sb = new StringBuilder();
        while (in.available() > 0) {//server is waiting for client once it sent all data
            int pos  = in.read(buf);
            String s = new String(buf, 0, pos);
            sb.append(s);
            //System.out.println("reading data..." + pos + " s>>>" + s.getBytes() + "available?" +  ins.available());
            //System.out.print(pos + " ? " + (char) pos);
        }
        return sb.toString();
    }
}

Answer 2

I solved this using

public static byte[] readChunkedData(final InputStream stream, final int size) throws IOException {
        byte[] buffer = new byte[size];
        DataInputStream din = new DataInputStream(stream);
        din.readFully(buffer);
        return buffer;
    }