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POPHP tcp connection to Java server hangs on socket_read()
 

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  1. POPHP tcp connection to Java server hangs on socket_read()
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    <p>I'm trying to create a PHP client to connect to a simple java server, send some data, and receive a response back. The java server responds fine when interacting with a simple client coded in Java, but once a request is sent from a PHP client it hangs indefinitely when socket_read() is called. If this line is commented out the data arrives just fine, but when its not it doesnt seem as though the Java server receives the data at all. This is very similar to this previously asked question: <a href="https://stackoverflow.com/questions/9714694/simple-java-tcp-server-and-php-client-problems">Simple Java TCP Server and PHP Client Problems</a> but as far as I can tell my code is nearly identical in operation to the solution given. </p> <p>The java server is multithreaded, that is for other parts of the program and I dont beleive that is causing the issue. The php script has a UI hooked into it for testing. Anyone know whats going on?</p> <p>Java Server:</p> <pre><code> import java.io.*; import java.net.*; import java.lang.*; class TCPRelayServer { String clientSentence; String responseString; ServerSocket socket; Socket connection; public void TCPRelayServer() throws Exception{ System.out.println("Created Relay"); } public void run() throws Exception{ clientSentence = ""; responseString = ""; // Open socket to all localhost connections on port socket = new ServerSocket(9090, 100, InetAddress.getByName(null)); socket.setSoTimeout(5000); while(true) { try{ System.out.println("**Relay Server** Relay Server Waiting"); // Setup buffers and connection connection = socket.accept(); InputStreamReader inputStream = new InputStreamReader(connection.getInputStream()); BufferedReader input = new BufferedReader(inputStream); DataOutputStream response = new DataOutputStream(connection.getOutputStream()); // Get server input clientSentence = input.readLine(); System.out.println("**Relay Server** Received: " + clientSentence); // Perform logic responseString = clientSentence.toUpperCase() + "\n"; // send response response.writeBytes("IT WORKED!\n"); response.flush(); response.close(); } catch(Exception e){ continue; } } } } class Relay implements Runnable { Thread runner; public Relay() { } public Relay(String threadName) { runner = new Thread(this, threadName); // (1) Create a new thread. System.out.println(runner.getName()); runner.start(); // (2) Start the thread. } public void run(){ //Display info about this particular thread System.out.println("Thread Started: " + Thread.currentThread()); TCPRelayServer relay = new TCPRelayServer(); try{ relay.run(); } catch(Exception e){ System.out.println("Relay Server Failed to Run"); return; } } } public class Triplestore { public static void main(String[] args) { Relay RELAY = new Relay("Relay"); //Server SERVER = new Server("Server"); //Client CLIENT = new Client("Client"); //Display info about the main thread System.out.println("Main Thread: " + Thread.currentThread()); while(true){ } } } </code></pre> <p>PHP Client:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;style type="text/css"&gt; input, textarea, label, div, a, form { display:inline; float:left; clear:left; } #messageLabel{ clear:left; margin-top:20px; } form{ width:600px; } textarea, input{ font-size:14px; margin-left:30px; } input{ padding:3px; } textarea{ width:500px; height:300px; padding:10px; } input[type=submit]{ float:right; margin-right: 70px; margin-top: 10px; } #results{ font-family: monospace; clear: none; padding: 20px; background-color: black; color: white; margin-top: 30px; height: 299px; width: 500px; border: 3px solid #CCC; overflow:auto; } #results .success{color:#3ba13d;} #results .error{color:#c2291a;} &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;form action="/test/tcp/tcp.php" method="post"&gt; &lt;label for="port"&gt;Port Number: &lt;/label&gt; &lt;input type="text" name="port" id="port" value="9090"&gt;&lt;br&gt; &lt;label for="message" id="messageLabel"&gt;Message: &lt;/label&gt; &lt;textarea placeholder="Type Message Here" id="message" name="message"&gt;&lt;/textarea&gt;&lt;br&gt; &lt;input type="submit"&gt; &lt;/form&gt; &lt;div id="results"&gt; &lt;?php if(isset($_POST['port']) &amp;&amp; isset($_POST['message'])){ // Get port by service name or by port number $port = $_POST['port']; //getservbyname('www', 'tcp'); // Get the IP address for the target hostname or by ip. $address = '127.0.0.1'; //gethostbyname('localhost'); // Get user message $message = $_POST['message']; $output = ''; $next = ''; // Create a TCP/IP socket. echo "Creating TCP/IP socket..."; $socket = @socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp')); //SOL_TCP if ($socket === false) { echo "&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;span class='error'&gt;&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp; FAILED Reason: socket_create() - " . socket_strerror(socket_last_error()) . "&lt;br&gt;&lt;/span&gt;"; } else { echo "&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;span class='success'&gt;OK&lt;/span&gt;&lt;br&gt;"; } // Connect to address on port echo "Connecting to '$address' on port '$service_port'..."; $connect = @socket_connect($socket, $address, $port); if ($connect === false) { echo "&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;span class='error'&gt;FAILED &lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;Reason: socket_connect() - " . socket_strerror(socket_last_error($socket)) . "&lt;br&gt;&lt;/span&gt;"; } else { echo "&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;span class='success'&gt;OK&lt;/span&gt;&lt;br&gt;"; } // Send Message echo "Sending message..."; $sent = @socket_sendto($socket, $message, strlen($message), MSG_EOF, $address, $port); if ($sent === false) { echo "&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;span class='error'&gt;FAILED&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;Reason: socket_write() - " . socket_strerror(socket_last_error($socket)) . "&lt;br&gt;&lt;/span&gt;"; } else { echo "&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;span class='success'&gt;OK&lt;/span&gt;&lt;br&gt;"; } // Read Response echo "Reading response...&lt;br&gt;"; //$line = socket_read($socket, 1024, PHP_NORMAL_READ); //$output .= $line; while($next = socket_read($socket, 4096, PHP_NORMAL_READ)){ $output .= $str; if($next == "" || strpos($output,"\n") !== false) break; } echo 'Output: ' . $output; if ($output === false) { echo "&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;span class='error'&gt;FAILED &lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;Reason: socket_read() - " . socket_strerror(socket_last_error($socket)) . "&lt;br&gt;&lt;/span&gt;"; } else { echo "&amp;nbsp;&amp;nbsp;&amp;nbsp;" . $output . "&lt;br&gt;"; } // Close Socket echo "Closing socket..."; socket_close($socket); echo "&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;span class='success'&gt;OK&lt;/span&gt;&lt;br&gt;"; } else{ echo "Please enter a port number and message.&lt;br&gt;"; } ?&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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