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POSocket: could not connect to server or specific port
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  1. POSocket: could not connect to server or specific port
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    copied!<p>I am trying to connect server by port and Host Name.<br> I find one program but when i am trying to run it will show following Exception </p> <pre><code>java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:69) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391) at java.net.Socket.connect(Socket.java:579) at java.net.Socket.connect(Socket.java:528) at java.net.Socket.&lt;init&gt;(Socket.java:425) at java.net.Socket.&lt;init&gt;(Socket.java:208) at sample.Echoclient2.main(Echoclient2.java:31) Couldn't get I/O for the connection to: 127.0.0.1 Java Result: 1 </code></pre> <p>Here is my code which i use. </p> <pre><code>public class Echoclient2 { public static void main(String[] args) throws IOException { String serverHostname = new String ("127.0.0.1"); if (args.length &gt; 0) serverHostname = args[0]; System.out.println ("Attemping to connect to host " + serverHostname + " on port 10008."); Socket echoSocket = null; PrintWriter out = null; BufferedReader in = null; try { echoSocket = new Socket(serverHostname, 10008); System.out.println("server name"+Inet4Address.getByName(serverHostname)); out = new PrintWriter(echoSocket.getOutputStream(), true); in = new BufferedReader(new InputStreamReader( echoSocket.getInputStream())); System.out.println("Connection accepted " + echoSocket.getInetAddress() + ":" + echoSocket.getPort()); } catch (UnknownHostException e) { e.printStackTrace(); System.err.println("Don't know about host: " + serverHostname); System.exit(1); } catch (IOException e) { e.printStackTrace(); System.err.println("Couldn't get I/O for " + "the connection to: " + serverHostname); System.exit(1); } BufferedReader stdIn = new BufferedReader( new InputStreamReader(System.in)); String userInput; System.out.println ("Type Message (\"Bye.\" to quit)"); while ((userInput = stdIn.readLine()) != null) { out.println(userInput); // end loop if (userInput.equals("Bye.")) break; System.out.println("echo: " + in.readLine()); } out.close(); in.close(); stdIn.close(); echoSocket.close(); } </code></pre> <p>} </p> <p><strong>What i need:</strong><br> 1. I need to send some message to server and want response from server. Suppose i send "I am user of stackoverflow" then server should give any response like return same String or convert in uppercase or something else. </p> <p><strong>Some Questions:</strong><br> 1. I write client Java File but whether i need to write server java file.<br> 2. Can we send request by using ip and port.<br> 3. Can we use host name.<br> 4. Any echo server name? i need to send message to this server want to know response.<br> 5. I try both server,java and client.java then i got result? is this solution for me. </p>
 

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