How to detect a remote side socket close? [duplicate]

The isConnected method won't help, it will return true even if the remote side has closed the socket. Try this:

public class MyServer {    public static final int PORT = 12345;    public static void main(String[] args) throws IOException, InterruptedException {        ServerSocket ss = ServerSocketFactory.getDefault().createServerSocket(PORT);        Socket s = ss.accept();        Thread.sleep(5000);        ss.close();        s.close();    }}public class MyClient {    public static void main(String[] args) throws IOException, InterruptedException {        Socket s = SocketFactory.getDefault().createSocket("localhost", MyServer.PORT);        System.out.println(" connected: " + s.isConnected());        Thread.sleep(10000);        System.out.println(" connected: " + s.isConnected());    }}

Start the server, start the client. You'll see that it prints "connected: true" twice, even though the socket is closed the second time.

The only way to really find out is by reading (you'll get -1 as return value) or writing (an IOException (broken pipe) will be thrown) on the associated Input/OutputStreams.

Since the answers deviate I decided to test this and post the result - including the test example.

The server here just writes data to a client and does not expect any input.

The server:

ServerSocket serverSocket = new ServerSocket(4444);Socket clientSocket = serverSocket.accept();PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);while (true) {  out.println("output");  if (out.checkError()) System.out.println("ERROR writing data to socket !!!");  System.out.println(clientSocket.isConnected());  System.out.println(clientSocket.getInputStream().read());        // thread sleep ...  // break condition , close sockets and the like ...}

• clientSocket.isConnected() returns always true once the client connects (and even after the disconnect) weird !!
• getInputStream().read()
  • makes the thread wait for input as long as the client is connected and therefore makes your program not do anything - except if you get some input
  • returns -1 if the client disconnected
• out.checkError() is true as soon as the client is disconnected so I recommend this

You can also check for socket output stream error while writing to client socket.

out.println(output);if(out.checkError()){    throw new Exception("Error transmitting data.");}