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POPython server only receives one character from Java client?
 

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  1. POPython server only receives one character from Java client?
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    <p>I'm trying to implement a simple Python server to communicate with some simple Java client code, but I'm getting some strange behavior. I'm running Mac OSX 10.7.2.</p> <p>Client code:</p> <pre><code>import java.io.*; import java.net.*; public class JavaClient { public static void main(String argv[]) throws Exception { String sentence; String modifiedSentence; BufferedReader inFromUser = new BufferedReader( new InputStreamReader(System.in)); Socket clientSocket = new Socket("localhost", 9999); DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream()); BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); sentence = inFromUser.readLine() + '\n'; outToServer.writeBytes(sentence); modifiedSentence = inFromServer.readLine(); System.out.println("FROM SERVER: " + modifiedSentence); clientSocket.close(); } } </code></pre> <p>Server code:</p> <pre class="lang-py prettyprint-override"><code>import SocketServer class PythonServer(SocketServer.BaseRequestHandler): def handle(self): # self.request is the TCP socket connected to the client self.data = self.request.recv(1024).strip() print "{} wrote:".format(self.client_address[0]) print self.data # just send back the same data, but upper-cased self.request.sendall(self.data.upper()) if __name__ == "__main__": HOST, PORT = "localhost", 9999 # Create the server, binding to localhost on port 9999 server = SocketServer.TCPServer((HOST, PORT), MyTCPHandler) # Activate the server; this will keep running until you # interrupt the program with Ctrl-C server.serve_forever() </code></pre> <p>Strangely, the first time I instantiate the server and send a request from the Java client, everything behaves as expected:</p> <p>Java console:</p> <pre><code>test FROM SERVER: TEST </code></pre> <p>Command line:</p> <pre><code>127.0.0.1 wrote: test </code></pre> <p>But subsequent requests result in:</p> <p>Java console:</p> <pre><code>test FROM SERVER: T </code></pre> <p>Command line:</p> <pre><code>127.0.0.1 wrote: t </code></pre> <p>So it looks like my server is only receiving the first character of my message, despite the fact that my client believes that it's sending the whole message.</p> <p>To further complicate things, I created a Java server and Python client and the Java client / server combo and Python client / server combo don't have this problem, but the Python client / Java server does.</p> <p>Any ideas?</p>
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    1. COTry to `flush` your `outToServer` after writing the data that needs to go out to the server
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    3. CO@GETah I added a line to flush the buffer after writing to it, but this didn't change the behavior. Any other ideas?
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