Keeping a server program on

Hello,
First of all, I'm not sure this is related to Java at all, so don't be angry if it indeed does not.
Anyway, I have a simple server program (written in Java) that I'm trying to run on a Linux system, which I connect from home using SSH.
The problem is that after I close the session (connection) to the Linux server, my program also terminates, while I want it to be operating all the time, not only when I'm connected to the server!
This does not happen with other programs I have run in the past which were not written by me (such as MySQL database server).
Does anyone have any idea why this is happening and how to solve it?
Thanks very much.

Well given only that, I would argue that your program will never end. However, there's a number of ways to break out of that loop. I'm going to go ahead and make the assumption that either an Exception is being thrown, something inside the loop is returning or breaking out of the loop, or System.exit() is called, or something...

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Problem in server program

Hi
My client prog runs in an infinite loop where it captures the screen and creates an image object.
After that it sends the image object to the server prog.
Server program receives it and displays it using Jframe , that is it uses a panel and a button named paste.
So I have used an infinite loop in the server side as well.
Problem is as long as client is running the interface that i used for pasting , pops up but I cant see the paste button
Its only when I close the client side the paste button becomes visible and its also working.
but I need to paste it even when the client side is running.
Any idea where am I going wrong?
The relevant codes are as follows----
SERVER:
public class Test
     public Test() {
     try {
     ServerSocket ser=new ServerSocket(4444);
     ImageIcon img=new ImageIcon();
     String s1="1";
     for(;;){
        Socket clisoc=ser.accept();
        DataOutputStream os1 = new DataOutputStream(clisoc.getOutputStream());
        os1.writeUTF(s1);
       ObjectInputStream oin = new ObjectInputStream(clisoc.getInputStream());
        img=(ImageIcon)oin.readObject();
        Image i =img.getImage();
       Test1 e = new Test1(i);
        System.out.println(i);
     os1.close();
     oin.close();
     clisoc.close();
     }catch(Exception e){}
}Test1 class is used for creating the image from the image object.
CLIENT---
public final class Test2 implements ClipboardOwner{
    public static void main (String[] aArguments ){
     try{
          String s1;
          for(;;){
    Socket clisoc= new Socket("localhost",4444);
    TextTransfer textTransfer = new TextTransfer();
    DataInputStream dis=new DataInputStream(clisoc.getInputStream());
    s1=dis.readUTF();
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    robot.keyRelease(KeyEvent.VK_PRINTSCREEN);
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    ImageIcon ic = new ImageIcon(g);
    System.out.println(ic);
    ObjectOutputStream oos = new ObjectOutputStream(clisoc.getOutputStream());
    Thread.sleep(9000);
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    dis.close();
    oos.close();
    clisoc.close();
   else
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    }catch(Exception e){System.out.println(e);}
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Thanks in advance.

Thanks for replying.
I got rid of the problem by introducing a similar if-else block in the server side as well.
Now I also dont have any Thread.sleep() in either client or server program.
The interface that I used to paste the image pops up alright but the paste button takes almost 3 minutes to appear.
Is it normal in windows 98 (P4)?Mind you , the button is working fine.
would you specify why should I "get rid of other close statements" except oos.close()?
I solved my previous problem by keeping them as it is.

Multiple Clients in Client/Server Program

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Firstly, I can communicate one to one with the server and the client as the client socket is stored in a variable. However, to make it possible to allow multiple connections I've used a thread for each new connection but I'm not sure how I can broadcast messages to every connection. Would it be safe enough to store each client socket in a list and then communicate that way? Not sure what will happen when the client disconnects though it seems to be an issue.
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clientSocket = serverSocket.accept();'clientSocket' should be a local variable here.
else {
serverSocket.close();
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return clientSocket;This return statement is meaningless. You may as well return null. SwingWorker doesn't care. Don't just return something because you've got it lying around. In this case you shouldn't have it lying around.
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JCo server programming, properties and connection settings

Greetings, SAP professionals.
The reason I come to this forum is that I'm hoping to gain some insights into the use of the SAP Java Connector (JCo). I am a developer who was tasked with making a new component for a systems integration application. As is typical of integration software, our app can link together various different systems using a variety of protocols, as well as providing the means to apply business logic on messages passed from one location to another. We already have a connector acting as an SAP client which was implemented using JCo. Now, we were asked to develop a new component: a server capable of accepting RFCs from a remote SAP system acting as client. The server is to be created using the JCo classes, so basically an extension of JCo.Server, with some logic for creating function templates from configuration files.
However, while I'm understanding the structure of the Java API, it's not entirely clear to me just what the classes do. I've found the JavaDoc for JCo to be mostly descriptive of the interface of classes and methods, but not really explaining what these achieve, or how. So I'm hoping to be set straight, as I fear I'm kind of misunderstanding the functionality of JCo... Being mainly an integrations developer, I unfortunately often have to settle for gaining a superficial knowledge of a variety of systems to quickly interface with them, so I don't have any prior knowledge of SAP but still need to be able to implement something with JCo without too much delay.
The most important question I have is this: when a JCO.Server implementation is started, does it act as a fully standalone component capable of receiving calls, or does it merely act as a sort of listener for some main SAP system? I'm not talking about a reliability on the two .dll files (or .so for Linux) that are required for the use of JCo, I just wish to know if the JCo package is entirely self-sufficient for server functionality or if it is intended to be linked to some SAP system.
A second problem I have is that the parameters passed to various constructors aren't clear to me... I'm not familiar with SAP terminology, nor have I worked with any client apps that make use of an SAP system.
The meaning of client strings, gwhost, gwservice, ashost, system IDs and program IDs mostly elude me, especially when it comes to knowing what client parameters must match what server parameters.
In order to familiarize myself with the classes, I've tried playing around with them a bit trying to create a small test app that first starts a JCO.Server instance, then tries to make a remote function call to it with a JCO.Client (within the same class, for simplicity and debugging purposes). I was wondering if this actually makes sense... Would a JCo client be capable of connecting to a JCo server, all running purely in Java, or is that nonsense?
To eliminate some common troubleshooting options, I'll quicly describe the steps I've taken:
Both librfc32.dll and sapjcorfc.dll were placed in the Windows system32 folder. Maybe only librfd32 needs to be placed there, but I copied both anyway to make sure.
The directory containing the jar file and both dll files is included in my environment path variable.
I've added a line to the C:\Windows\system32\drivers\etc\services file as follows:
sapgw00 3300/tcp #SAP System Gateway Port
I've opened port 3300 in my Windows firewall. In fact, I also tested with the firewall completely turned off.
However, I do not manage to get my test class to work. I've tried ports 3300, 3200 and 3600. I've tried various permutations of the client and server properties. I've tried removing the line from the services file, which would prompt the client to state upon connecting that the service "sapgw00" is unknown. When I add it back in, the error changes to "partner not reached", so it is definitely picking something up.
The server itself starts just fine, but connecting through a client doesn't work. My class source code is posted below. Maybe what I'm trying to do doesn't make any sense, but at the moment it's my best guess.
I realize this is a pretty long post and the class, while not exactly big, also implies a bit of reading of its own. But if anyone could give me any answers that are new to me, I'd be hugely grateful. Right now I'm kind of stuck, and just setting up the service and letting our customer test on it is a somewhat slow approach that can't match developing and testing on one and the same host.
Preliminary thanks to everyone who took the effort to read this.
//Start of code
import java.util.Properties;
import com.sap.mw.jco.IFunctionTemplate;
import com.sap.mw.jco.IMetaData;
import com.sap.mw.jco.IRepository;
import com.sap.mw.jco.JCO;
public class Test {
 public static void main(String[] args) {
 Test test = new Test();
 ServerThread serverThread = test.new ServerThread();
 serverThread.start();
 while(!serverThread.isReady) {
 try {
 Thread.sleep(5000);
 } catch(final InterruptedException i) {
 System.out.println("Rudely awakened");
 try {
// JCO.Function func = getSampleFunction(test, "STAY");
// serverThread.server.handleRequest(func);
// System.out.println(func.getExportParameterList().toXML());
// func = getSampleFunction(test, "STOP");
// serverThread.server.handleRequest(func);
// System.out.println(func.getExportParameterList().toXML());
 final Properties clientProps = getClientProps();
 JCO.Client client = JCO.createClient(clientProps);
 client.connect();
 IRepository rep = JCO.createRepository("1", client);
 IFunctionTemplate templ = rep.getFunctionTemplate("TEST_FUNC");
 JCO.Function function = templ.getFunction();
 function.getImportParameterList().setValue("STAY", "FIELD1");
 client.execute(function);
 JCO.Function function2 = templ.getFunction();
 function2.getImportParameterList().setValue("STOP", "FIELD1");
 client.execute(function2);
 } catch(final Exception e) {
 e.printStackTrace(System.out);
 serverThread.requestStop();
 while(serverThread.isAlive) {
 try {
 Thread.sleep(5000);
 } catch(final InterruptedException i) {
 System.out.println("Rudely awakened");
 } finally {
 private static Properties getClientProps() {
 final Properties props = new Properties();
 props.setProperty("jco.client.client", "100");
 props.setProperty("jco.client.user", "");
 props.setProperty("jco.client.passwd", "");
 props.setProperty("jco.client.lang", "");
 props.setProperty("jco.client.sysnr", "00");
 props.setProperty("jco.client.ashost", "/H/localhost/S/sapgw00");
 props.setProperty("jco.client.gwhost", "localhost");
 props.setProperty("jco.client.gwserv", "sapgw00");
 return props;
 public class ServerThread extends Thread {
 public void run() {
 isAlive = true;
 IRepository repos = new TestRepository("testrep");
 repos.addFunctionInterfaceToCache(getFunctionInterface());
 server = new TestServer(repos);
 server.start();
 System.out.println("Server successfully started");
 isReady = true;
 while(!stop) {
 try {
 Thread.sleep(1000);
 } catch(final InterruptedException i) {
 System.out.println("Wouldn't let me sleep...");
 stop = server.stopRequested;
 server.stop();
 isAlive = false;
 System.out.println("Server successfully stopped");
 public void requestStop() {
 server.requestStop();
 public TestServer server;
 public boolean isReady = false;
 public boolean isAlive = false;
 public class TestServer extends JCO.Server {
 public TestServer(IRepository rep) {
 super("localhost", "sapgw00", "PROGID", rep);
 public void handleRequest(JCO.Function fct) {
 try {
 JCO.ParameterList importParams = fct.getImportParameterList();
 final String importXML = importParams.toXML();
 System.out.println("XML representation of import parameters: ");
 System.out.println(importXML);
 final String input = importParams.getString("FIELD1");
 System.out.println("FIELD1 value: " + input);
 JCO.ParameterList exportParams = fct.getExportParameterList();
 if(input.equals("STOP")) {
 exportParams.getField("FIELD2").setValue("OK");
 stopRequested = true;
 catch(JCO.AbapException ex) {
 throw ex;
 catch(Throwable t) {
 throw new JCO.AbapException("SYSTEM_FAILURE", t.getMessage());
 public boolean checkAuthorization(String functionName, int authorMode, String partner, byte[] key) {
 System.out.println(functionName + " " + partner);
 return true;
 public void requestStop() {
 stopRequested = true;
 public boolean stopRequested = false;
 public class TestRepository extends JCO.BasicRepository implements IRepository {
 public TestRepository(String name) {
 super(name);
 public static IMetaData getFunctionInterface() {
 JCO.MetaData metaData = new JCO.MetaData("TEST_FUNC");
 metaData.addInfo("FIELD1", IMetaData.TYPE_STRING, 4);
 metaData.setFlags(0, IMetaData.IMPORT_PARAMETER);
 metaData.addInfo("FIELDX", IMetaData.TYPE_STRING, 8);
 metaData.setFlags(1, IMetaData.IMPORT_PARAMETER & IMetaData.OPTIONAL_PARAMETER);
 metaData.addInfo("FIELD2", IMetaData.TYPE_STRING, 2);
 metaData.setFlags(2, IMetaData.EXPORT_PARAMETER);
 return metaData;
 public static JCO.Function getSampleFunction(Test test, String s) {
 TestRepository testRep = test.new TestRepository("testrepository");
 testRep.addFunctionInterfaceToCache(getFunctionInterface());
 JCO.Function func = testRep.getFunctionTemplate("TEST_FUNC").getFunction();
 func.getImportParameterList().setValue(s, "FIELD1");
 return func;
 private static boolean stop = false;

If I understood you correctly, you want to provide a "service" that can be called from SAP. To provide this service you've chosen to implement an (external) RFC server program via JCo. One common method for RFC server programs is to register in SAP on the gateway - you do this by supplying the three parameters
<ol>
<li>jco.server.gwhost - SAP gateway host on which the server should be registered (so this would be the server name or IP address of the SAP gateway; localhost is only correct, if your RFC server program runs on the same server as the SAP gateway)</li>
<li>jco.server.gwserv - Gateway service, i.e. the port on which a registration can be done</li>
<li>jco.server.progid - Program ID under which your RFC server program can be reached (free, made-up case sensitive name, that should represent the service your RFC server is providing)</li>
</ol>
So essentially you're creating a listener, that is registered in SAP and waits for any invocations. Within SAP they will define a RFC destination, which basically represents a TCP/IP connection pointing to the SAP gateway where you registered with the given program ID. If you want more details, check the SAP help pages for <a target="_blank" href="http://help.sap.com/saphelp_nw04/helpdata/en/22/04262b488911d189490000e829fbbd/content.htm">RFC destinations</a> (you're looking for destination type T, see explanations <a target="_blank" href="http://help.sap.com/saphelp_nw04/helpdata/en/22/042652488911d189490000e829fbbd/content.htm">here</a>).
Usually gateway host and service (port) are given to you by the SAP basis folks and you tell them which program ID you're using. They will then enter those parameters in an RFC destination of type T in SAP. So no need for any of the client parameters you've mentioned. Although, I'd like to repeat, it's usually handy to also have SAP logon parameters maintained on your RFC server program, so that you can utilize the repository data from SAP (might be irrelevant in your case).
Hope this clarifies it a bit...

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I think you are trying to run both server and client
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It is impossible, your server is blocking the port to
send packets, so you must run client on another
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import java.net.*;
import java.util.*;
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 String [] tokens = clientStr.split(" ");
 //Obtains HTTP version
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}Cheers,
Chris

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When adding a yahoo email account I keep getting "Server Unavailable" notification. This started after I updated my software. I deleted my accounts and tried to re-add them but continue to get this notification??

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How to create desktop application for simple server program using netbeans?

Hi,can anyone help me on this one??
I'm am very new to java,and I already trying different example program to create desktop applications
for simple server program but it's not working.
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import java.io.*;
import java.net.*;
public class Server {
* @param args the command line arguments
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try{
ServerSocket serverSocket = new ServerSocket(4488);
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System.out.println(socket.getInetAddress() + "connected");
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
BufferedReader in = new BufferedReader( new InputStreamReader(socket.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null){
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out.close();
in.close();
socket.close();
serverSocket.close();
}catch(IOException e){
e.printStackTrace();
// TODO code application logic here
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and this is the Main Processing :
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import java.awt.event.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import java.text.*;
import java.util.*;
import java.net.*;
import java.io.*;
public class MainProcessing {
private static final long serialVersionUID = 1L;
static private boolean isApplet_ = true;
static private InetAddress argIp_ = null;
static private int argPort_ = 0;
public TCPIP TCPIP_ = null;
private InetAddress ip_ = null;
private int port_ = 10001;
static private boolean conectFlag = false;
private BufferedWriter bw;
FileOutputStream fos;
OutputStreamWriter osw;
public int[] current = new int[400];
public int[] volt = new int[400];
public int[] revolution = new int[400];
public void init() {
public void start() {
if (isApplet_) {
try {
ip_ = InetAddress.getByName(getCodeBase().getHost());
} catch (UnknownHostException e) {
} else {
ip_ = argIp_;
if (argPort_ != 0) {
port_ = argPort_;
// IPアドレスが不明なら何もしない
if (ip_ != null) {
// コネクションが成立していないなら、接続
if (TCPIP_ == null) {
TCPIP_ = new TCPIP(ip_, port_);
if (TCPIP_.getSocket_() == null) {
System.out.println("ミス１");
// エラーメッセージを表示
return;
if (TCPIP_ == null) {
System.out.println("ミス２");
return;
System.out.println("成功");
conectFlag = true;
try {
TCPIP_.sendF();
} catch (IOException ex) {
Logger.getLogger(MainProcessing.class.getName()).log(Level.SEVERE, null, ex);
System.out.println("" + conectFlag);
return;
public void receive() {
try {
// Calendar cal1 = Calendar.getInstance(); //(1)オブジェクトの生成
// int year = cal1.get(Calendar.YEAR); //(2)現在の年を取得
// int month = cal1.get(Calendar.MONTH) + 1; //(3)現在の月を取得
// int day = cal1.get(Calendar.DATE); //(4)現在の日を取得
// int hour = cal1.get(Calendar.HOUR_OF_DAY); //(5)現在の時を取得
// int min = cal1.get(Calendar.MINUTE); //(6)現在の分を取得
// int sec = cal1.get(Calendar.SECOND); //(7)現在の秒を取得
byte[] rev = TCPIP_.receive();
// System.out.println("受信");
if (rev != null) {
byte[] Change = new byte[1];
int j = 0;
for (int i = 0; i < 1200; i++) {
Change[0] = rev;
current[j] = decimalChange(Change);
i++;
Change[0] = rev[i];
volt[j] = decimalChange(Change);
i++;
Change[0] = rev[i];
revolution[j] = decimalChange(Change);
} catch (NullPointerException e) {
public int decimalChange(byte[] byteData) {
int bit0, bit1, bit2, bit3, bit4, bit5, bit6, bit7;
int bit = 0;
for (int i = 0; i < 8; i++) {
int a = (byteData[0] >> i) & 1;
System.out.print(a);
System.out.println();
return 1;
public void destroy() {
// 切断
if (TCPIP_ != null) {
TCPIP_.disconnect();
if (TCPIP_.getSocket_() != null) {
try {
System.out.println("\ndisconnect:" + TCPIP_.getSocket_().getInetAddress().getHostAddress() + " " + TCPIP_.getSocket_().getPort());
} catch (Exception e) {
TCPIP_ = null;
public boolean conect(int IP) {
conectFlag = false;
String address = "192.168.1." + IP;
System.out.println(address);
try {
argIp_ = InetAddress.getByName(address);
} catch (UnknownHostException e) {
// xp.init();
isApplet_ = false;
start();
return (conectFlag);
public void send(String command, int value, int sendData[][], int i) {
int j = 0;
Integer value_ = new Integer(value);
byte values = value_.byteValue();
Integer progNum = new Integer(i);
byte progNums = progNum.byteValue();
try {
TCPIP_.send(command, values, progNums);
for (j = 1; j <= i; j++) {
Integer time = new Integer(sendData[j][0]);
byte times = time.byteValue();
Integer power = new Integer(sendData[j][1]);
byte powers = power.byteValue();
TCPIP_.send(times, powers);
TCPIP_.flush();
} catch (IOException ex) {
Logger.getLogger(MainProcessing.class.getName()).log(Level.SEVERE, null, ex);
public void file(String name) {
ublic void fileclose(String name, String command, int value, int sendData[][], int i) {
try {
fos = new FileOutputStream("" + name + ".csv");
osw = new OutputStreamWriter(fos, "MS932");
bw = new BufferedWriter(osw);
String msg = "" + command + "," + value + "";
bw.write(msg);
bw.newLine();
for (int j = 1; j <= i; j++) {
msg = "" + j + "," + sendData[i][0] + "," + sendData[i][1];
bw.write(msg);
bw.newLine();
bw.close();
} catch (IOException ex) {
Logger.getLogger(MainProcessing.class.getName()).log(Level.SEVERE, null, ex);

Multi-threaded server programming

Hello, I meet a problem and don't know how to solve it: I have created a multi-threaded server program which receives multiple users from their own PCs. The server program receives users'commands and echo it back to all users who are currently connecting to my server. I store every clientSocket connecting to my server into a vector. My question is: how the server broadcasts a user command to other users? And how the server knows to which user he will echo the command to since the hostName and port number are the same to every user currently connecting to my server? Thanks a lot.

You should look at extending the Socket class to encorporate user details. Either use what peter suggested or make the user pass a username (or something) when they connect.
When you want to broadcast to all users just enumerate through your vector and send each one the command. If you mean the user performs a task on their application and you want to produce the same results in all the other users apps then its down to you to code it. When user1 clicks on a button the app must send a command (eg. a string) to the server which sends the same string to all other users. When the user receives this string it performs some task.
Is that what you mean?
Ted.

Problem in server program: HELP!!!!

I just tried to introduce methods in my server program (TCPServer.java). the methods are
run_server() : for creating server socket object
[b[accept() [/b]: for Listening to a connection, made to the socket and accepting it.
getstreams() : initializing the streams
b]recieve_n_process() : receiving client input and processing it
send_response(): sending response back to client.
But now I am getting runtime exception
C:\Program Files\j2sdk_nb\j2sdk1.4.2\bin\abc>javac TCPServer.java
C:\Program Files\j2sdk_nb\j2sdk1.4.2\bin\abc>java TCPServer
Exception in thread "main" java.lang.NullPointerException
at TCPServer.accept(TCPServer.java:19)
at TCPServer.main(TCPServer.java:58)
C:\Program Files\j2sdk_nb\j2sdk1.4.2\bin\abc>
I know I might have made some silly mistake somewhere, please help me to detect it.
here is my code TCPServer.java
import java.io.*;
import java.net.*;
class TCPServer {
     private ServerSocket welcomeSocket;
     private Socket connectionSocket;
     private ObjectInputStream Client_input;
     private ObjectOutputStream Client_output;
     private     String clientSentence;
     private String capitalizedSentence;
     private void run_server() throws Exception
      ServerSocket welcomeSocket = new ServerSocket(80);
     private void accept() throws Exception
     {connectionSocket = welcomeSocket.accept(); }
     private void getstreams() throws IOException
     Client_output = new ObjectOutputStream(connectionSocket.getOutputStream());
     Client_output.flush();
         Client_input = new ObjectInputStream(connectionSocket.getInputStream());
     private void recieve_n_process() throws Exception
     clientSentence = (String ) Client_input.readObject();
     capitalizedSentence = clientSentence.toUpperCase() + '\n';
     private void send_response() throws IOException
     Client_output.writeObject(capitalizedSentence);
public static void main(String argv[]) throws Exception
     TCPServer server = new TCPServer();
     try{
     server.run_server();
      while(true) {
          server.accept();
          server.getstreams() ;
          server.recieve_n_process();
          server.send_response();
     } catch(EOFException eofException) {}
       catch (IOException ioException) {}
    }It was working fine before I introduced these methods. Earlier it was like this
import java.io.*;
import java.net.*;
class TCPServer {
public static void main(String argv[]) throws Exception
      String clientSentence;
      String capitalizedSentence;
      ServerSocket welcomeSocket = new ServerSocket(80);
      while(true) {
                   Socket connectionSocket = welcomeSocket.accept();
           ObjectInputStream inFromClient = new ObjectInputStream(connectionSocket.getInputStream());
           ObjectOutputStream outToClient =
             new ObjectOutputStream(connectionSocket.getOutputStream());
           clientSentence = (String ) inFromClient.readObject();
           capitalizedSentence = clientSentence.toUpperCase() + '\n';
           outToClient.writeObject(capitalizedSentence);

hello every one,
i got it where is the problem. I had declared the object of ServerSocket class locally in run_server(). It had to be declared globally though.
private void run_server() throws Exception
     ServerSocket welcomeSocket = new ServerSocket(80);
this one works out
private void run_server() throws Exception
     welcomeSocket = new ServerSocket(80);
     }

File transfer, read write through sockets in client server programming java

Hello All, need help again.
I am trying to create a Client server program, where, the Client first sends a file to Server, on accepting the file, the server generates another file(probably xml), send it to the client as a response, the client read the response xml, parse it and display some data. now I am successful sending the file to the server, but could not figure out how the server can create and send a xml file and send it to the client as response, please help. below are my codes for client and server
Client side
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
public class XMLSocketC
 public static void main(String[] args) throws IOException
 //Establish a connection to socket
 Socket toServer = null;
 String host = "127.0.0.1";
 int port = 4444;
 try
 toServer = new Socket(host, port);
 } catch (UnknownHostException e) {
 System.err.println("Don't know about host: localhost.");
 System.exit(1);
 } catch (IOException e) {
 System.err.println("Couldn't get I/O for the connection to host.");
 System.exit(1);
 //Send file over Socket
 //===========================================================
 BufferedInputStream fileIn = null;
 BufferedOutputStream out = null;
 // File to be send over the socket.
 File file = new File("c:/xampp/htdocs/thesis/sensorList.php");
 // Checking for the file to be sent.
 if (!file.exists())
 System.out.println("File doesn't exist");
 System.exit(0);
 try
 // InputStream to read the file
 fileIn = new BufferedInputStream(new FileInputStream(file));
 }catch(IOException eee)
 System.out.println("Problem, kunne ikke lage fil");
 try
 InetAddress adressen = InetAddress.getByName(host);
 try
 System.out.println("Establishing Socket Connection");
 // Opening Socket
 Socket s = new Socket(adressen, port);
 System.out.println("Socket is clear and available.....");
 // OutputStream to socket
 out = new BufferedOutputStream(s.getOutputStream());
 byte[] buffer = new byte[1024];
 int numRead;
 //Checking if bytes available to read to the buffer.
 while( (numRead = fileIn.read(buffer)) >= 0)
 // Writes bytes to Output Stream from 0 to total number of bytes
 out.write(buffer, 0, numRead);
 // Flush - send file
 out.flush();
 // close OutputStream
 out.close();
 // close InputStrean
 fileIn.close();
 }catch (IOException e)
 }catch(UnknownHostException e)
 System.err.println(e);
 //===========================================================
 //Retrieve data from Socket.
 //BufferedReader in = new BufferedReader(new InputStreamReader(toServer.getInputStream()));
 DataInputStream in = new DataInputStream(new BufferedInputStream(toServer.getInputStream()));
 //String fromServer;
 //Read from the server and prints.
 //Receive text from server
 FileWriter fr = null;
 String frn = "xxx_response.xml";
 try {
 fr = new FileWriter(frn);
 } catch (IOException e1) {
 // TODO Auto-generated catch block
 e1.printStackTrace();
 try{
 String line = in.readUTF(); //.readLine();
 System.out.println("Text received :" + line);
 fr.write(line);
 } catch (IOException e){
 System.out.println("Read failed");
 System.exit(1);
 in.close();
 toServer.close();
public class XMLSocketS
 public static void main(String[] args) throws IOException
 //Establish a connection to socket
 ServerSocket serverSocket = null;
 try {
 serverSocket = new ServerSocket(4444);
 } catch (IOException e) {
 System.err.println("Could not listen on port: 4444.");
 System.exit(1);
 Socket clientLink = null;
 while (true)
 try
 clientLink = serverSocket.accept();
 System.out.println("Server accepts");
 BufferedInputStream inn = new BufferedInputStream(clientLink.getInputStream());
 BufferedOutputStream ut = new BufferedOutputStream(new FileOutputStream(new File("c:/xampp/htdocs/received_from_client.txt")));
 byte[] buff = new byte[1024];
 int readMe;
 while( (readMe = inn.read(buff)) >= 0)
 { //reads from input stream, writes the file to disk
 ut.write(buff, 0, readMe);
 // close the link to client
 clientLink.close();
 // close InputStream
 inn.close();
 // flush
 ut.flush();
 // close OutputStream
 ut.close();
 //Sending response to client
 //============================================================
 //============================================================
 System.out.println("File received");
 }catch(IOException ex)
 {System.out.println("Exception.");}
 finally
 try
 if (clientLink != null) clientLink.close();
 }catch(IOException e) {}
 clientLink.close();
 //serverSocket.close();
}

SERVER
import java.net.*;
import java.io.*;
public class XMLSocketS
 public static void main(String[] args) throws IOException
 //Establish a connection to socket
 ServerSocket serverSocket = null;
 try {
 serverSocket = new ServerSocket(4545);
 } catch (IOException e) {
 System.err.println("Could not listen on port: 4444.");
 System.exit(1);
 Socket clientLink = null;
 try
 clientLink = serverSocket.accept();
 System.out.println("Server accepts the client request.....");
 BufferedInputStream inn = new BufferedInputStream(clientLink.getInputStream());
 BufferedOutputStream ut = new BufferedOutputStream(new FileOutputStream(new File("c:/xampp/htdocs/received_from_client.txt")));
 byte[] buff = new byte[1024];
 int readMe;
 while( (readMe = inn.read(buff)) >= 0)
 { //reads from input stream, writes the file to disk
 ut.write(buff, 0, readMe);
 ut.flush();
 //Sending response to client
 //============================================================
 BufferedInputStream ftoC = null;
 BufferedOutputStream outtoC = null;
 // File to be send over the socket.
 File file = new File("c:/xampp/htdocs/thesis/user_registration_response.xml");
 try
 // InputStream to read the file
 ftoC = new BufferedInputStream(new FileInputStream(file));
 }catch(IOException eee)
 {System.out.println("Problem reading file");}
 // OutputStream to socket
 outtoC = new BufferedOutputStream(clientLink.getOutputStream());
 byte[] buffer = new byte[1024];
 int noRead;
 //Checking if bytes available to read to the buffer.
 while( (noRead = ftoC.read(buffer)) >= 0)
 // Writes bytes to Output Stream from 0 to total number of bytes
 outtoC.write(buffer, 0, noRead);
 outtoC.flush();
 //============================================================
 System.out.println("File received");
 }catch(IOException ex)
 {System.out.println("Exception.");}
 finally
 try
 if (clientLink != null) clientLink.close();
 }catch(IOException e) {}
 clientLink.close();
 //serverSocket.close();
 }CLIENT SIDE
import java.io.*;
import java.net.*;
public class XMLSocketC
 @SuppressWarnings("deprecation")
 public static void main(String[] args)
 // Server: "localhost" here. And port to connect is 4545.
 String host = "127.0.0.1";
 int port = 4545;
 BufferedInputStream fileIn = null;
 BufferedOutputStream out = null;
 // File to be send over the socket.
 File file = new File("c:/xampp/htdocs/thesis/sensorList.xml");
 try
 // InputStream to read the file
 fileIn = new BufferedInputStream(new FileInputStream(file));
 }catch(IOException eee)
 {System.out.println("Problem");}
 try
 System.out.println("Establishing Socket Connection");
 // Opening Socket
 Socket clientSocket = new Socket(host, port);
 System.out.println("Socket is clear and available.....");
 // OutputStream to socket
 out = new BufferedOutputStream(clientSocket.getOutputStream());
 byte[] buffer = new byte[1024];
 int numRead;
 //Checking if bytes available to read to the buffer.
 while( (numRead = fileIn.read(buffer)) >= 0)
 // Writes bytes to Output Stream from 0 to total number of bytes
 out.write(buffer, 0, numRead);
 // Flush - send file
 out.flush();
 //=======================================
 DataInputStream in = new DataInputStream(new BufferedInputStream(clientSocket.getInputStream()));
 BufferedWriter outf = new BufferedWriter(new FileWriter("c:/xampp/htdocs/received_from_server.txt",true));
 String str;
 while(!(str = in.readLine()).equals("EOF")) {
 System.out.println("client : Read line -> <" + str + ">");
 outf.write(str);//Write out a string to the file
 outf.newLine();//write a new line to the file (for better format)
 outf.flush();
 //=======================================
 // close OutputStream
 out.close();
 // close InputStrean
 fileIn.close();
 // close Socket
 clientSocket.close();
 }catch (IOException e)
 {System.out.println("Exception.");}
 Could you please point where am I doing the stupid mistake, client to server is working properly, but the opposite direction is not.
Thanks

Keeping a server program on

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