Server Client comunication
I have to send Document type attribute from server to client. I'm using code from sockets tutorial and it seems like they can only communicate with String type attributes. So the question is, how can I send Document type attribute (XML DOM) ?
When I'm sending something from client to server it works, but it doesn't work in other direction. This is part of the code from client side:
Socket soc = new Socket(InetAddress.getLocalHost(), 8020);
InputStream in = new ObjectInputStream( soc.getInputStream() );
String sa = (String) in.readObject();
It says that method readObject is undefined for the type InputStream
What should I do to make it work?
Similar Messages
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\\SERVER\Clients\Setup\setup.exe with Windows Vista Error
I added the first Vista client to an SBS 2003, SP1 domain. Until now, all clients were WinXP, SP2. Office 2003 is installed on the XP clients, and the Vista client, which may not be pertinent to this problem.
As is normal, "\\SERVER\Clients\Setup\setup.exe /s SERVER" is executed when a user logs on to any domain client. On the Vista client, I always get the dialog -- regardless of the account privilege -- asking for permission to run Setup.exe. It is annoying. Occasionally, the Program Compatiblity Assistant will appear and advise there's a known compatiblity issue with Setup.exe. It points to KB article 926505 for resolution. The title of the KB is, "Windows Small Business Server 2003: Windows Vista and Outlook 2007 compatibility update."
When I run the SBS2003SP1-KB926505-X86-ENU.EXE fix, I get the error: "This update cannot be installed. Either it is already installed as part of an existing service pack, or it requires a more recent service pack. For more information, see the systems requirements on the download page."
I installed Windows Server 2003 SP2 and run the KB926505 fix, but I get the same error "This update cannot be installed. Either it is already installed as part of an existing service pack" After a reboot of te SBS server the same problem on the Vista client, I always get the dialog -- regardless of the account privilege -- asking for permission to run Setup.exe. It is annoying. Occasionally, the Program Compatiblity Assistant will appear and advise there's a known compatiblity issue with Setup.exe. It points to KB article 926505 for resolution.
The problem is Windows Vista Business, because all windows XP clients have no problem at all.PNP,
You do not say whether if you accept the permission dialog whether the setup continues or not, but the short answer to the question revolves around UAC.
Remember that EVERY user (except the actual Administrator account) has only Standard user rights regardless of group. When a task that requires Admin rights is executed, one of three things will happen: 1) If you are THE Administrator, then your task will continue. 2) If you have Admin rights, you will be prompted that a process is trying to use elevated rights and ask for permission, or 3) If you are a Standard user, you will either be denied flatly or prompted to supply credentials. Which of these happen depend on GPO settings, but the default is to prompt.
In any event, I believe that this is what you are running into, and is one of the big feature improvements in Vista. Yes, it can be a bit annoying (Try deleting an "All Users" icon from the Start Menu!) but is there to place one more barrier between virus and malware writers and your OS.
If it's TOO annoying to bear, you can turn off UAC by going into your profile and disabling it. (It requires Admin rights, of course. ) It is not recommended as you do a very effective job or nutering the Vista Security Model by doing so.
If it, of course, your choice. we IT Admins have a lot more issues with this than the standard user, but for me, I gladly take the tradeoff because I worry a lot less about those few I HAVE to give Admin rights to.
Good luck! -
regarding mountain lion server: clients experience intermittent service connections. the server system log has the following error- Client handshake failed (6):113: Server not accepting client connections. any suggestions would be greatly appreciated - thank you
Hi Jason
I was getting the same behavior after Apple support had me delete some plist files to get Airplay going. I was also getting the following error:
the error occurred while processing a command of type 'writesettings' in the plug-in 'server vpn'
I went into ~/Library/Preferences/ and /Library/Preferences/ and deleted every plist contating the word server. I had to re-set up my server (meaning walk through some intial steps) but all of my settings were still there after that and everything started working again.
Just a thought, obviously try at your own risk but it worked for me.
Kellen -
O.S. / Hard Drive Size for NIO Server/Client's load testing...
Hi All
I am currently load testing a NIO Server/Client's to see what would be the maximum number of connections that could reached, using the following PC: P4, 3GHz, 1GB RAM, Windows XP, SP2, 110 GB Hard Drive.
However, I would like to test the Server/Client performance on different OS's:
Which would be the best possible option from the following:
1. Partition my current drive, (using e.g. Partition Magic), to e.g.
- Win XP: 90 GB
- Win Server 2000: 10 GB
- Linux: 5 GB
- Shared/Data: 5 GB
2. Install a separate Hard drive with the different hard drives
3. Use a disk caddie, to swap in/out test hard drives.
4. Any thing else?
- Would the Operating System's hard drive size affect the Server/Client's performance, e.g. affecting the number of connections, number of File Handles, the virtual memory, etc.?
Many Thanks,
MattYou can use a partition on the same HDD or use a second HDD, disk caddie well if its a direct IDE or SCSI. If its usb no it will be too slow, may be if you have a fire-wire but I still don't recommend it.
Be careful if you don't have any experience installing Linux you may do multiple partitions on you disk without knowing, because Linux ext partitions are not visible to windows.
Recommended disk size for fedora is 10 GB. This is the amount of data that will be created on you HDD when you do a full installation. -
Java Server/Client Applicaton - problem with sending data back
Hello!
I'm trying to write a small server/client chat application in Java. It's server with availability to accept connections from many clients and it's app just for fun... However, I've come up against a huge problem: everything what clients send, arrives to server (I'm sure about that because it is displayed on the Server Application screen) and then server should send it back to all clients but it doesn't work. I have no faintest idea what causes this problem. Maybe you can help me?
Here is my server app code:
import java.net.*;
import java.util.*;
import java.io.*;
* @author Robin
public class Server {
ServerSocket serw = null;
Socket socket = null;
String line = null;
Vector<ClientThread> Watki = new Vector();
ClientThread watek = null;
public Server(int port) {
try {
serw = new ServerSocket(port);
line = "";
while(true) {
System.out.println("Running. Waiting for client to connect...");
socket = serw.accept();
System.out.println("Connected with:\n" + socket.getInetAddress() + "\n");
watek = new ClientThread(socket);
Watki.addElement(watek);
Watki.firstElement().Send("doszlo?");
}catch (IOException e) {
System.out.println("BLAD: " + e);
public void sendToAll(String s) {
for(int i = 0; i < Watki.size(); i++) {
Watki.elementAt(i).Send(s);
public class ClientThread extends Thread {
Socket socket;
DataInputStream in = null;
DataOutputStream out = null;
String line = null;
public ClientThread(Socket s) {
try {
this.socket = s;
in = new DataInputStream(s.getInputStream());
out = new DataOutputStream(s.getOutputStream());
start();
}catch (IOException e) {
System.out.println("BLAD: " + e);
public void Send(String s) {
try {
out.writeUTF(s);
}catch (IOException e) {
System.out.println("BLAD: " + e);
public void run() {
try {
line = "";
while (true) {
line = in.readUTF();
System.out.println(line);
sendToAll(line);
}catch (IOException e) {
System.out.println("BLAD: " + e);
public static void main(String[] args) {
Server serwer = new Server(5000);
}And here is client app code:
import java.net.*;
import java.util.*;
import java.io.*;
* @author Robin
public class Client implements Runnable {
Socket socket = null;
BufferedReader keyIn = new BufferedReader(new InputStreamReader(System.in));
DataInputStream in = null;
DataOutputStream out = null;
String line = null;
public Client(String host, int port) {
try {
System.out.println("Connecting to " + host + ":" + port);
socket = new Socket(host, port);
System.out.println("Connected\nTALK:");
out = new DataOutputStream(socket.getOutputStream());
in = new DataInputStream(socket.getInputStream());
line = "";
while(!line.toLowerCase().equals(".bye")) {
line = keyIn.readLine();
Send(line);
}catch (UnknownHostException e) {
System.out.println("BLAD: " + e);
}catch (IOException e) {
System.out.println("BLAD: " + e);
public void Send(String s) {
try {
out.writeUTF(s);
}catch (IOException e) {
System.out.println("BLAD: " + e);
public void run() {
String loaded = "";
try {
while(true) {
loaded = in.readUTF();
System.out.println(loaded);
}catch (IOException e) {
System.out.println("BLAD: " + e);
public static void main(String[] args) {
Client client = new Client("localhost", 5000);
}By the way, this app is mainly written in English language (text that appears on the screen) however in functions I used Polish language (for example: BLAD - it means ERROR in English). Sorry for that :)Yeap, I will change those exceptions later, thanks for advice.
You asked what's going on with it: both applications start with no errors, but when I write something in client side it should be sent to the server and then forwarded to all connected clients but it stops somewhere. However, I added a one line to the server code
line = in.readUTF();
System.out.println(line);
sendToAll(line); and after it reads message from client (no matter which one) it shows that message on the server side screen, then it should send this message to all clients but it doesn't work in this moment. What's confusing: no errors occurs, so it's rather a mistake in my code, but where?
Edited by: Robin3D on Sep 30, 2009 9:07 AM -
JMS Internal Error at Server Client Adapter!JMS Service is not started
Hi
Can any one tell me how to trouble shoot for following errors:
Failed to Create Connection! Reason: Response from the server could not be reached.
JMS Internal Error at Server Client Adapter!JMS Service is not started
The following hosts could not be reached 143:223:221:10:50310
We are trying to send the request from SONICMQ JMS to R/3 and trying to post the response to Sonic Queue. but we are facing some problems for JMS adapter .
but in JMS sender and receiver adapter i gave different IP and port for listen the SONIC queue. why it is showing in different IP here? this message got from logviewer.
regards
Rambarki...Rambarki,
What is the error displayed on the Adapter Monitoring pages?
Generally the correct error descriptions for connectivity issues are found on adapter monitoring UI than any other.
Other possible reasons could be :
<i>JMS Service is not started
The following hosts could not be reached 143:223:221:10:50310</i> This might be issue with your network settings i.e. XI server is unable to reach the specified IP on specified port.
Regards,
Amol -
Non-blocking Server/Client is blocking...?!
First, a simple question:
Why in most example code using Selectors, when iterating over the Set returned by Selector.selectedKeys() does the currently selected SelectionKey get removed from the Iterator? I see it all the time, but since the SelectionKey is still bound to the underlying Selector it seems to not really do anything.
Now to my main problem:
I been working with 1.4 for a week now trying to implement a simple test server/client, whereby the server constantly sends out the current time to any subscribing clients, who in turn display the time to stdout. Pretty straight forward, huh?
Well, everything seems to go fine...once. The Server accepts the client connection, sends out a the current time, the client (only one for now) receives it, displays to the screen, but then both server and client block on the Selector.select() method.
If I shut down the client, the server then continues through the select() method, finding one SelectionKey, tries to write to it and throws an IOException (since the client is no more). I'm catching that exception and then removing the channel from the Selector, so that the server may continue to service requests.
When starting a second client while the first is still running causes the following sequence of events:
Server: starts up
ClientA: connects to server
Server: broadcasts the time
ClientA: displays time
// nothing else happens until...
ClientB: connects to server
Server: broadcasts the time
ClientA: displays time
ClientB: displays time
//everything blocks again...
ClientA: disconnects from server
Server: broadcasts the time
ClientB: displays time
As you can see it seems everything blocks until a client does something (connect/disconnect).
I will post code if anyone asks, but I don't want to spam the board if no one is willing to help me.
-JustinYou got it!
// ********** SERVER **********
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.channels.CancelledKeyException;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Set;
public class TestServer
private static final int DEFAULT_PORT = 9999;
public static void main(String[] args)
TestServer s = new TestServer();
}//end of main(String[])
public TestServer()
this(DEFAULT_PORT);
}// end of TestServer()
public TestServer(int port)
InetSocketAddress addr = new InetSocketAddress(port);
try
Selector acceptSelector = Selector.open();
Selector broadcastSelector = Selector.open();
ConnectionList connections = new ConnectionList(broadcastSelector);
Acceptor a = new Acceptor(acceptSelector, addr, connections);
Broadcaster b = new Broadcaster(broadcastSelector, connections);
a.start();
b.start();
}// end of try
catch (Exception ex)
ex.printStackTrace();
}// end of catch
}// end of TestServer(int)
private static String status(Selector s)
StringBuffer sb = new StringBuffer(100);
sb.append("Selector: ");
Set keys = s.keys();
sb.append("\n\tNum Keys: ");
sb.append(keys.size());
Iterator iter = keys.iterator();
int i = 0;
while (iter.hasNext())
try
sb.append("\n\t[");
sb.append(i++);
sb.append("]:");
SelectionKey key = (SelectionKey)iter.next();
sb.append(" acceptable=");
sb.append(key.isAcceptable());
sb.append(" connectable=");
sb.append(key.isConnectable());
sb.append(" readable=");
sb.append(key.isReadable());
sb.append(" writable=");
sb.append(key.isWritable());
}// end of try
catch (CancelledKeyException cke)
sb.append("*** CANCELLED KEY");
}// end of catch
}// end of while
return sb.toString();
}// end of status(Selector)
class Broadcaster extends Thread
private final String TF = Broadcaster.class.getName();
private int BUFFER_SIZE = 2048;
private Selector selector_;
private ConnectionList connections_;
private ByteBuffer buffer_;
public Broadcaster(Selector selector, ConnectionList connections)
super("Broadcaster");
selector_ = selector;
connections_ = connections;
buffer_ = ByteBuffer.allocateDirect(BUFFER_SIZE);
public void run()
while (true)
try
registerNewChannels();
System.out.println("BroadcasterThread: Before select() "+status(selector_));
System.out.println("BroadcasterThread: Selecting...");
int keysReady = selector_.select();
System.out.println("BroadcasterThread: After select() "+status(selector_));
System.out.println("BroadcasterThread: "+keysReady+" ready Key(s)");
if (keysReady > 0)
transmit();
}// end of if
}// end of try
catch (Exception ex)
ex.printStackTrace();
return;
}// end of catch
}// end of while
protected void registerNewChannels()
throws Exception
SocketChannel channel = null;
while (null != (channel = connections_.removeFirst()))
channel.configureBlocking(false);
channel.register(selector_, SelectionKey.OP_WRITE);
System.out.println("BroadcasterThread: Registered connection from " + channel.socket().getInetAddress());
}// end of while
}// end of registerNewChannels()
public void transmit()
throws Exception
Set readyKeys = selector_.selectedKeys();
System.out.println("BroadcasterThread: Selected Keys: "+readyKeys.size());
SelectionKey tempKey = null;
SocketChannel tempChannel = null;
fillBuffer();
for (Iterator i = readyKeys.iterator(); i.hasNext(); )
tempKey = (SelectionKey)i.next();
tempChannel = (SocketChannel)tempKey.channel();
if (tempKey.isWritable())
System.out.println("BroadcasterThread: Key selected is Writable");
try
tempChannel.write(buffer_);
System.out.println("BroadcasterThread: Sent message to "+tempChannel.socket().getInetAddress());
}// end of try
catch (IOException ioe)
System.err.println("BroadcasterThread: Lost Connection");
tempChannel.close();
}// end of catch
}// end of if
else
System.out.println("BroadcasterThread: Key selected is not Writable");
}// end of else
}// end of for
buffer_.clear();
}// end of transmit()
private void fillBuffer()
buffer_.clear();
/* Place Date in Buffer */
long time = System.currentTimeMillis();
Date d = new Date(time);
System.out.println("BroadcasterThread: Broadcasting "+d);
String date = d.toString()+"\n";
byte[] datebuff = date.getBytes();
buffer_.put(datebuff);
/* Prepare for read operations */
buffer_.flip();
}// end of fillBuffer()
}//end of inner class Broadcaster
class Acceptor extends Thread
private Selector selector_;
private ConnectionList connList_;
private final String TF = Acceptor.class.getName();
public Acceptor(Selector selector, InetSocketAddress address, ConnectionList connList)
super("Acceptor");
selector_ = selector;
connList_ = connList;
try
ServerSocketChannel ssc = ServerSocketChannel.open();
ssc.configureBlocking(false);
ssc.socket().bind(address);
System.out.println("AcceptorThread: Bound to " + address);
ssc.register(selector_, SelectionKey.OP_ACCEPT);
}// end of try
catch (Exception ex)
ex.printStackTrace();
}// end of catch
public void run()
while (true)
try
System.out.println("AcceptorThread: Selecting...");
int keysReady = selector_.select();// block till a channel is ready
System.out.println("AcceptorThread: "+keysReady+" Keys Ready");
if (keysReady > 0)
acceptPendingConnections();
}// end of if
catch (Exception ex)
ex.printStackTrace();
protected void acceptPendingConnections()
throws Exception
Set readyKeys = selector_.selectedKeys();
System.out.println("AcceptorThread: Selected "+readyKeys.size()+" Keys");
for (Iterator i = readyKeys.iterator(); i.hasNext(); )
SelectionKey key = (SelectionKey)i.next();
i.remove();
ServerSocketChannel readyChannel = (ServerSocketChannel)key.channel();
SocketChannel incomingChannel = readyChannel.accept();
System.out.println("AcceptorThread: Connection from " + incomingChannel.socket().getInetAddress());
connList_.add(incomingChannel);
}// end of for
}// end of acceptPendingConnections()
}// end of inner class Acceptor
class ConnectionList
private LinkedList list_;
private Selector selectorToNotify_;
public ConnectionList(Selector toNotify)
list_ = new LinkedList();
selectorToNotify_ = toNotify;
}// end of ConnectionList(Selector)
public synchronized void add(SocketChannel newlyConnectedChannel)
list_.add(newlyConnectedChannel);
selectorToNotify_.wakeup();
}// end of add(SocketChannel)
public synchronized SocketChannel removeFirst()
SocketChannel first = null;
if (list_.size() > 0)
first = (SocketChannel)list_.removeFirst();
}//end of if
return first;
}// end of removeFirst()
}// end of inner class ConnectionList
}// end of class TestServer
// ********** CLIENT **********
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.CancelledKeyException;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.nio.channels.WritableByteChannel;
import java.util.Iterator;
import java.util.Set;
public class TestClient
public static final String TF = TestClient.class.getName();
private static final String DEFAULT_SERVER_IP = "127.0.0.1";
private static final int DEFAULT_SERVER_PORT = 9999;
private InetSocketAddress serverAddr_;
private Selector connectSelector_;
private Selector readSelector_;
private WritableByteChannel outputChannel_;
private ByteBuffer receiveBuffer_;
private SocketChannel serverChannel_;
public static void main(String[] args)
TestClient c = new TestClient();
}// end of main(String[])
public TestClient()
this(DEFAULT_SERVER_IP, DEFAULT_SERVER_PORT);
}// end of TestClient()
public TestClient(String ip, int port)
try
serverAddr_ = new InetSocketAddress(ip, port);
connectSelector_ = Selector.open();
readSelector_ = Selector.open();
outputChannel_ = Channels.newChannel(System.out);
receiveBuffer_ = ByteBuffer.allocateDirect(512);
connect();
run();
}// end of try
catch (Exception ex)
ex.printStackTrace();
}// end of catch
}// end of TestClient(String, int)
private void connect()
throws Exception
serverChannel_ = SocketChannel.open();
serverChannel_.configureBlocking(false);
serverChannel_.connect(serverAddr_);
serverChannel_.register(connectSelector_, SelectionKey.OP_CONNECT);
int numKeys = 0;
while (numKeys <= 0)
System.out.println("connect(): Selecting...");
numKeys = connectSelector_.select();
System.out.println("connect(): "+numKeys+" ready Key(s)");
Set readyKeys = connectSelector_.selectedKeys();
System.out.println("connect(): Selected Keys: "+readyKeys.size());
if (numKeys > 0)
SelectionKey tempKey = null;
SocketChannel tempChannel = null;
Iterator i = readyKeys.iterator();
while (i.hasNext())
tempKey = (SelectionKey)i.next();
i.remove();
tempChannel = (SocketChannel)tempKey.channel();
if (tempKey.isConnectable())
System.out.println("connect(): Key selected is Connectable");
if (tempChannel.isConnectionPending())
System.out.println("connect(): Connection Pending");
tempChannel.finishConnect();
System.out.println("connect(): Connection Completed");
}// end of if
}// end of if
else
System.out.println("connect(): Key selected is not Connectable");
}// end of else
}// end of while
}// end of if
}// end of while
}// end of connect()
private void run()
throws Exception
serverChannel_.register(readSelector_, SelectionKey.OP_READ);
while (true)
System.out.println("run(): Before select() "+status(readSelector_));
System.out.println("run(): Selecting...");
int numKeys = readSelector_.select();
System.out.println("run(): After select() "+status(readSelector_));
System.out.println("run(): "+numKeys+" Ready Key(s)");
if (numKeys > 0)
processKeys();
}// end of if
}// end of while
}// end of run()
private void processKeys()
throws Exception
Set readyKeys = readSelector_.selectedKeys();
System.out.println("processKeys(): Selected Keys: "+readyKeys.size());
SelectionKey tempKey = null;
SocketChannel tempChannel = null;
for (Iterator i = readyKeys.iterator(); i.hasNext(); )
tempKey = (SelectionKey)i.next();
tempChannel = (SocketChannel)tempKey.channel();
if (tempKey.isReadable())
System.out.println("processKeys(): Key selected is Readable");
try
tempChannel.read(receiveBuffer_);
receiveBuffer_.flip();
outputChannel_.write(receiveBuffer_);
receiveBuffer_.clear();
}// end of try
catch (IOException ioe)
System.out.println("processKeys(): Lost Connection");
tempKey.cancel();
}// end of catch
}// end of if
else
System.out.println("processKeys(): Key selected is not Readable");
}// end of else
}// end of for
}// end of processKeys()
private static String status(Selector s)
StringBuffer sb = new StringBuffer(100);
sb.append("Selector: ");
Set keys = s.keys();
sb.append("\n\tNum Keys: ");
sb.append(keys.size());
Iterator iter = keys.iterator();
int i = 0;
while (iter.hasNext())
try
sb.append("\n\t[");
sb.append(i++);
sb.append("]:");
SelectionKey key = (SelectionKey)iter.next();
sb.append(" acceptable=");
sb.append(key.isAcceptable());
sb.append(" connectable=");
sb.append(key.isConnectable());
sb.append(" readable=");
sb.append(key.isReadable());
sb.append(" writable=");
sb.append(key.isWritable());
}// end of try
catch (CancelledKeyException cke)
sb.append("*** CANCELLED KEY");
}// end of catch
}// end of while
return sb.toString();
}// end of status(Selector)
}// end of class TestClient -
After installing Final cut server client on OSX 10.6.8 error: Apple QuickTime or the QuickTime Java component is not installed.
I know this error on windows machines but cannot get a solution for OSX.I have fixed this by installing the latest combo update
-
Uncaught exception raised in Server Client-side plugin
When I try to connect to my XServe from the Server Admin on my desktop computer. I get the following error:
Uncaught exception raised in Server Client-side plugin
Sorry but the feature you tried to access cannot be used. Exception is:
In updateConfigurationViewFromDescription: NSInvalidArgumentException * -[NSCFNumber count]: unrecognized selector sent to instance 0x18819ee0 .
There is a second error with similar wording.
If I say ok to the warnings I can make changes but they do not save.
I can access the Server Admin on the XServe
Anyone know of a solution so that I can login and edit the settings for my XServe from a remote computer?I'm getting this too, server is XServe running 10.6.6, remote Server Admin is on a 10.5.8 PPC iMac. No errors with same remote against a PowerMac server running 10.5.8. No errors with 10.6.6 remote against either server.
Unlike the OP, however, the changes I've tried "take." The pop-ups are annoying though.
Another issue with the 10.5 Server Admin/10.6 Server, if it isn't a thread hijack, disk volumes do not show up in the File Sharing pane, Share Points appear OK. -
Python Server/Client Application Development
Hey All!
I am writing a basic proof of concept server/client application for a project I am working on.
My goal is this:
1) End user launches client.
2) Client connects to server.
3) User selects one or more files to send to server.
4) Server saves a copy of each file.
5) Server terminates connection.
5) Server processes each file.
6) Upon completion of the processing server sets a "processing completed flag."
7) Client periodically checks with server for "processing completed flag."
8) Client securely reconnects
9) Client downloads processed files.
I have no background in programming servers/clients so this will be a learning experience for me and the workflow described above may change as I learn more about how this all works. Currently my hope is to first implement a system that will stay connected while the files are processed and once I have a better understanding as to how that works I can add more complexity to the system.
I will be writing this in Python 3.3 and the server will be hosted on a server which will (for now) be running Arch.
This thread will act as a sort of development journal but feel free to comment or post suggestions. I will for sure have questions as I go along too!brettski wrote:Turns out the best way (so far as I can tell) is to go integer -> string -> byte and then byte -> string -> integer..
Do you mean regular, non-byte strings? That cannot possibly be the best way to do it. It would be like using Russian as an intermediary language for translating Spanish to French.
Maybe the following will set you on the right path:
http://stackoverflow.com/questions/6187 … -in-python
http://stackoverflow.com/questions/4445 … int-python
Looking further, this is probably the right way to do it:
some_int = 57
bytes = struct.pack('i', bytes)
sock.send(bytes)
See http://docs.python.org/3/library/struct.html for details.
As for threaded servers, you may find some useful examples here. -
Leopard Software Update Server + Client
Hello,
Now I have to use Mac OS X Tiger Server Software Update Server and OSX Tiger Client.
After installing OS X Tiger Server software update, I turned on the server and on apdaty do I download and have been prepared. OS X Tiger has found his client software update server, and everything worked.
Now I have OS X Leopard and Leopard Server Client.
Purely installed server and client purely installed. The server is running the server software update is downloaded updates. Leopard Client still download updates from the Internet and not from the local network and I do not know where the error. Why in the older version of all work without interference with the terminal and not now? Can someone please help me set the software update server to the client computers may not have anything set up and found this site automatically.
Thank you
I apologize for my incorrect EnglishThe Tiger systems must have some form of customization. SWU is not an auto-discover service. If you have one of the Tiger systems still available, enter both of these commands and report the results:
defaults read /Library/Preferences/com.apple.SoftwareUpdate
defaults read /Users/<adminusername>/Library/Preferences/com.apple.SoftwareUpdate
Does either of the results return the custom CatalogURL value? If not, then look in NetInfo Manager and look at your MCX values. There may have been a managed preference set for all systems. However, if Tiger systems are not bound that this is not possible unless an niutil command was run to insert the value.
Also, keep in mind that if your Leopard systems are not bound to OD, and you have Apple Remote Desktop, you can use a Send Unix command and hit all of your systems in a matter of seconds. It is really rather trivial.
Also, were your Tiger machines imaged from a DMG or a NetInstall Server? It is possible that the SWU custom address was set in the master image. This is why it appears to "just work." -
Hi All,
I'm just starting to work on this new server/client app and very new to UDP. Right now, I'm trying to read up on it. I'm wondering if anyone can point me to some good reading material. Quick question though, if a server (c-based) sends several messages, one right after another, can a client (java-based) handles these messages? I don't have any code to post just yet, still in the designing part. Thanks!Go for, JSP and Servlet ( Sun Microsystems )
or Professional Java Server Programming wrox -
i'm just starting to learn about server/client applications and i'm a little confused about actually implementing them.
my client will be an applet which can be accessed over the internet. i want the applet to be able to read/write to the server.
now my question is, how can i start up the server program?
i would want it to initialize and run, only when the user has gone to the website that uses the applet.look at using a Servlet, running under Tomcat (download the Java Web Services Developer pack from java.sun.com
here's what the servlet looks like:
mport javax.servlet.*;
import java.util.*;
import java.net.*;
public class ServletTest extends GenericServlet
/** servlet is initialising */
public void init()
System.out.println("ServletTest initializing");
/** servlet wascalled bt client */
public void service(ServletRequest request,ServletResponse response)
try
byte[] data=new byte[100];
ServletInputStream inputStream=request.getInputStream();
int read=inputStream.read(data);
String string=URLDecoder.decode(new String(data,0,read),"UTF-8");
System.out.println("read "+read+" bytes: "+string);
inputStream.close();
ServletOutputStream outputStream=response.getOutputStream();
Date date=new Date();
outputStream.write(date.toString().getBytes());
outputStream.close();
catch(Exception ex)
ex.printStackTrace();
/** servlet is being destroyed */
public void destroy()
System.out.println("ServletTest terminating");
here's what the client looks like:
mport javax.servlet.*;
import java.util.*;
import java.net.*;
public class ServletTest extends GenericServlet
/** servlet is initialising */
public void init()
System.out.println("ServletTest initializing");
/** servlet wascalled bt client */
public void service(ServletRequest request,ServletResponse response)
try
byte[] data=new byte[100];
ServletInputStream inputStream=request.getInputStream();
int read=inputStream.read(data);
String string=URLDecoder.decode(new String(data,0,read),"UTF-8");
System.out.println("read "+read+" bytes: "+string);
inputStream.close();
ServletOutputStream outputStream=response.getOutputStream();
Date date=new Date();
outputStream.write(date.toString().getBytes());
outputStream.close();
catch(Exception ex)
ex.printStackTrace();
/** servlet is being destroyed */
public void destroy()
System.out.println("ServletTest terminating"); -
Hi hussein/helios
What does forms metrics server & client do? Is it for load balancing? How does it load balance?
I have not touch this subject before.
Thanks a lot,
MsKHi,
Please see these docs.
Is It Necessary To Run Forms Metrics Client/Server If Not Load Balancing? [ID 797521.1]
How To De-activate Temporarily The Forms Metrics Server & Clients ? [ID 416349.1]
Thanks,
Hussein -
How to check Integration Server Client and ABAP stack Client?
How to check Integration Server Client and ABAP stack Client? How to check,,pls tell in detailed steps???
Points would be awarded.
Arnabhi,
Must be the server has different clients,one declared as application server ie abap stack client and the other declared as Integration server ie XI. U might be trying to open idx5 in application server client, in which idx5 exists but you cant open the screen even, that can be achieved through we02.
000 is the default client when XI server is installed .We can create separate clients on the system through sccl tcode.
As told we can find the client on sap logon screen.
Logon to sxmb_adm and check whether the client is declared as an application system(r/3) or Integration server(xi).Try idx5 in xi not r/3
Edited by: NagaDurga Nannapaneni on Aug 28, 2008 11:36 AM
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