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From: liyaohua.bupt@gmail.com
Newsgroups: comp.lang.java.programmer
Subject: Socket problem: read & write to same socket
Date: Tue, 13 Mar 2012 09:01:44 -0700 (PDT)
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I want to establish connection to a server(written by myself in Go language=
), read from socket, and then write into socket.

The connection can be established, and it reads correctly. But after that a=
nd when I want to write to socket, it closes the connection. I used wiresha=
rk to listen to the packets. I saw my program sent a FIN to the server side=
. So the server receives nothing.=20

Note that the server side only sends one line into socket.

I later wrote a server in Java and a client in Go. They work fine in both r=
ead and write.

Thanks in advance!



import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;



public class DeserializerTester {

	/**
	 * @param args
	 * @throws IOException=20
	 */
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		Socket s =3D null;
		BufferedReader in =3D null;
		BufferedWriter out =3D null;
		//PrintWriter out =3D null;

		try {
			s =3D new Socket("127.0.0.1", 9999);
			in =3D new BufferedReader(new InputStreamReader(s.getInputStream()));
			//out =3D new PrintWriter(s.getOutputStream(), false);
			out =3D new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
		} catch (UnknownHostException e) {
			System.err.println("Unknown host");
			System.exit(0);
		} catch (IOException e) {
			System.err.println("IO error");
			System.exit(1);
		}

		String msg =3D "";

		msg =3D in.readLine();
		System.out.println(msg);

		out.write("\"hi, socket\"");
		s.close();
	}

}