Sending and receiving byte[] using socket

Question

I have Socket socket=new Socket(ipAddress, port); in my code. I need to send byte[] and receive byte[] over that socket. How to do that, what wrappers to use (I always send byte[] and receive byte[] )?

Answer 1

Take a look at the tutorial on Reading from and Writing to a Socket .

To write a byte array to a socket you would:

byte[] message = ...;
Socket socket=new Socket(ipAddress, port);
OutputStream socketOutputStream = socket.getOutputStream();
socketOutputStream.write(message);

Similarly, to read, you would use socket.getInputStream .

Answer 2

You don't need wrappers. Just call getInputStream() and getOutputStream() on the socket object. The returned objects have read(byte[]) and write(byte[]) methods. Be careful to take the return value of read(byte[]) into account (it returns the number of bytes actually read).

Answer 3

On the server side, create a new ServerSocket and call accept() on the socket object to accept incoming connections. (You may wish to handle the newly connected session in a new thread to avoid blocking the main thread.)

On the client side, create a new Socket and call connect() with the server's address and port to initiate the connection.

Answer 4

Use this

public static byte[] sendandrecive(byte[] message)
{
    byte[] real = null;

    try
    {
        Socket s=new Socket("192.9.200.4",2775);
        DataInputStream dis=new DataInputStream(s.getInputStream());  
        DataOutputStream dout=new DataOutputStream(s.getOutputStream());  

        dout.write(message, 0, message.length);
        dout.flush();  

        //dout.close();  

        byte[] data = new byte[1000];
        int count = dis.read(data);
        real =new byte[count+1];
        for(int i=1;i<=count;i++)
        real[i]=data[i];

        s.close();
        System.out.println("ok");

        }

    catch(Exception e)
    {
        System.out.println(e);
    }
    return real;  
}