How to develop discussion forums using java

Hi, can any one kindly explain how to develop disccussion forums using java.
the application is like same as this forum. one post and the replies are come after that. creating new threads.
any tutuorial is available for this. what is best dabase for this. and which application server is required.

if you want to use a forum for sum purpose download an opensource forum software and deploy it in a server that support the serverside technology that it uses.
If you dont want to go through the trouble of installing the the forum software (normally there is a quaita bit of configuration to do). Goole for Free Forum Hosting and you will get plenty of places that hosts forums for you. Since they do the installation you dont have to wory about that part.
If you really want to develop a forum software first install an existing open source forum or get an account in a free forum hoster and take good look at the forum software and the features that it provides.
In here you only see the front end of the forum. The back end is much more complicated. You have to define forums and forum groups, you have to define user groups, you have to define which users has access to which forums. who can start topics and who can reply to topics and whgo has read only access. And how to clollect and stor statistics like number of posts by each user. And the list goes on...
So first take a look at the features in both front and back end of an existing forum software and decide what you want in your software. Then you can design the database to support those features. And then start coding.
Technicaly you will need to know how to do servlets/JSP and JDBC in order to build a forum. Most important part is you have to do lots of planing.

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How to develop a discussion forum using Java?

I am actually developing a forum using Java. That would actually include registering process for a new user and if the user has an account, he can log in. The program should then generate a welcome message and a randomly-created password of 8 char (char+digits), this wil be printed on the screen. I am quite a newbie in this area.. Appreciate for ur help
Thanzz....

and what is more import than actual programming when making a software like a forum system is the database design.
so first you have to designe your database
decide which data that you have to store and decide what are the table that you will need and what columns that you want in the tables
thats where you should start

How to develop e-commerce using java

Can you please give me the source code for building e-commerce/web site using java?

no, he wants the sourcecode of something that will
let him build e-commerce sites.
Something like one of those "create an online shopin
5 minutes" packages you can buy from some stores.and he wants to use java. so the problem comes down
to:
java BuildMyECommerceSite <sitename>OH why didn't he say so ??
Does he want the included tv advertising campaign ? ;-)

How to read system evenlog using java program in windows

How to read system evenlog using java program in windows???
is there any java class available to do this ? or any one having sample code for this?
Your friend Zoe

Welcome to the Sun forums.
>
How to read system evenlog using java program in windows???>
JNI. (No.)
>
is there any java class available to do this ? or any one having sample code for this?>You will generally get better help around here if you read the documentation, try some sample code and come back with a specific question (hopefully with an SSCCE included).
>
Your friend Zoe>(raised eyebrow) Thank you for sharing that with us.
Note also that one '?' denotes a question, while 2 or more generally denotes a dweeb.

How to print PDF files using java print API

Hi,
I was goign throw lot of discusion and reading lot of forums related to print pdf files using java api. but nothing seems to be working for me. Can any one tell me how to print pdf files using java api.
Thanks in advance

Mike,
Can't seem to get hold of the example described in your reply below. If you could let us have the URL to get then it would be great.
My GUI application creates a pdf document which I need to print. I want to achieve this using the standard Java class PrinterJob (no 3rd party APIs I'm afraid, commercial restraints etc ..). I had a stab at it using the following code. When executed I get the pretty printer dialog then when I click ok to print, nothing happens!
boolean showPrintDialog=true;
PrinterJob printJob = PrinterJob.getPrinterJob ();
printJob.setJobName ("Contract.pdf");
try {
if (showPrintDialog) {
if (printJob.printDialog()) {
printJob.print();
else
printJob.print ();
} catch (Exception PrintException) {
PrintException.printStackTrace();
Thank you and a happy new year.
Cheers,
Chris

How to uncompress zip files using java program

hai,
please give some sample code to decompress the zip file.
how to uncompress zip files using java program
thanking you
arivarasu

http://developer.java.sun.com/developer/technicalArticles/Programming/PerfTuning/
Scroll down to 'Compression'

How to set proxy authentication using java properties at run time

Hi All,
How to set proxy authentication using java properties on the command line, or in Netbeans (Project => Properties
=> Run => Arguments). Below is a simple URL data extract program which works in absence of firewall:
import java.io.*;
import java.net.*;
public class DnldURLWithoutUsingProxy {
   public static void main (String[] args) {
      URL u;
      InputStream is = null;
      DataInputStream dis;
      String s;
      try {
          u = new URL("http://www.yahoo.com.au/index.html");
         is = u.openStream();         // throws an IOException
         dis = new DataInputStream(new BufferedInputStream(is));
         BufferedReader br = new BufferedReader(new InputStreamReader(dis));
      String strLine;
      //Read File Line By Line
      while ((strLine = br.readLine()) != null)      {
      // Print the content on the console
          System.out.println (strLine);
      //Close the input stream
      dis.close();
      } catch (MalformedURLException mue) {
         System.out.println("Ouch - a MalformedURLException happened.");
         mue.printStackTrace();
         System.exit(1);
      } catch (IOException ioe) {
         System.out.println("Oops- an IOException happened.");
         ioe.printStackTrace();
         System.exit(1);
      } finally {
         try {
            is.close();
         } catch (IOException ioe) {
}However, it generated the following message when run behind the firewall:
cd C:\Documents and Settings\abc\DnldURL\build\classes
java -cp . DnldURLWithoutUsingProxy
Oops- an IOException happened.
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at sun.net.NetworkClient.doConnect(NetworkClient.java:139)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:402)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:618)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:306)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:267)
at sun.net.www.http.HttpClient.New(HttpClient.java:339)
at sun.net.www.http.HttpClient.New(HttpClient.java:320)
at sun.net.www.http.HttpClient.New(HttpClient.java:315)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:510)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:487)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:615) at java.net.URL.openStream(URL.java:913) at DnldURLWithoutUsingProxy.main(DnldURLWithoutUsingProxy.java:17)
I have also tried the command without much luck either:
java -cp . -Dhttp.proxyHost=wwwproxy -Dhttp.proxyPort=80 DnldURLWithoutUsingProxy
Oops- an IOException happened.
java.io.IOException: Server returned HTTP response code: 407 for URL: http://www.yahoo.com.au/index.html
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1245) at java.net.URL.openStream(URL.java:1009) at DnldURLWithoutUsingProxy.main(DnldURLWithoutUsingProxy.java:17)
All outgoing traffic needs to use the proxy wwwproxy (alias to http://proxypac/proxy.pac) on port 80, where it will prompt for valid authentication before allowing to get through.
There is no problem pinging www.yahoo.com from this system.
I am running jdk1.6.0_03, Netbeans 6.0 on Windows XP platform.
I have tried Greg Sporar's Blog on setting the JVM option in Sun Java System Application Server (GlassFish) and
Java Control Panel - Use browser settings without success.
Thanks,
George

Hi All,
How to set proxy authentication using java properties on the command line, or in Netbeans (Project => Properties
=> Run => Arguments). Below is a simple URL data extract program which works in absence of firewall:
import java.io.*;
import java.net.*;
public class DnldURLWithoutUsingProxy {
   public static void main (String[] args) {
      URL u;
      InputStream is = null;
      DataInputStream dis;
      String s;
      try {
          u = new URL("http://www.yahoo.com.au/index.html");
         is = u.openStream();         // throws an IOException
         dis = new DataInputStream(new BufferedInputStream(is));
         BufferedReader br = new BufferedReader(new InputStreamReader(dis));
      String strLine;
      //Read File Line By Line
      while ((strLine = br.readLine()) != null)      {
      // Print the content on the console
          System.out.println (strLine);
      //Close the input stream
      dis.close();
      } catch (MalformedURLException mue) {
         System.out.println("Ouch - a MalformedURLException happened.");
         mue.printStackTrace();
         System.exit(1);
      } catch (IOException ioe) {
         System.out.println("Oops- an IOException happened.");
         ioe.printStackTrace();
         System.exit(1);
      } finally {
         try {
            is.close();
         } catch (IOException ioe) {
}However, it generated the following message when run behind the firewall:
cd C:\Documents and Settings\abc\DnldURL\build\classes
java -cp . DnldURLWithoutUsingProxy
Oops- an IOException happened.
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at sun.net.NetworkClient.doConnect(NetworkClient.java:139)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:402)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:618)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:306)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:267)
at sun.net.www.http.HttpClient.New(HttpClient.java:339)
at sun.net.www.http.HttpClient.New(HttpClient.java:320)
at sun.net.www.http.HttpClient.New(HttpClient.java:315)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:510)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:487)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:615) at java.net.URL.openStream(URL.java:913) at DnldURLWithoutUsingProxy.main(DnldURLWithoutUsingProxy.java:17)
I have also tried the command without much luck either:
java -cp . -Dhttp.proxyHost=wwwproxy -Dhttp.proxyPort=80 DnldURLWithoutUsingProxy
Oops- an IOException happened.
java.io.IOException: Server returned HTTP response code: 407 for URL: http://www.yahoo.com.au/index.html
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1245) at java.net.URL.openStream(URL.java:1009) at DnldURLWithoutUsingProxy.main(DnldURLWithoutUsingProxy.java:17)
All outgoing traffic needs to use the proxy wwwproxy (alias to http://proxypac/proxy.pac) on port 80, where it will prompt for valid authentication before allowing to get through.
There is no problem pinging www.yahoo.com from this system.
I am running jdk1.6.0_03, Netbeans 6.0 on Windows XP platform.
I have tried Greg Sporar's Blog on setting the JVM option in Sun Java System Application Server (GlassFish) and
Java Control Panel - Use browser settings without success.
Thanks,
George

How to send mail attachments using java mail

can any one help how to create mails attachments using java mail

you can do it like this:
Message msg = new MimeMessage(session);
String fileAttachment = "c:/test.txt";
Multipart mp = new MimeMultipart();
BodyPart bp = new MimeBodyPart();
FileDataSource fds = new FileDataSource(fileAttachment);
bp.setDataHandler(new DataHandler(fds));
bp.setFileName(fds.getName());
mp.addBodyPart(bp);
msg.setContent(mp);
...

How to develop web service using Intellij Idea 6.0

How to develop web services using Intellij Idea 6.x. A sample web service and service client is needed with full procedure. Thanx in advance.

Web service is technology not a tools that bundle with IDE.
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1- You should get some general info about SOAP, WSDL and Web sevice usage
2- Start to implmenet a simple Hello world web service and deploy it on application(web service) server
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for step 2,3 Apache Axis(2) could be a good solution for developement or you can use JAX-WS for sun

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Hi ,
I am new to ejb3.0 with eclipse. If any one familar that please guide me...
how to develop web application using ejb3.0 with eclipse.please help me... server jboss4.2.2. database mqsql5.0
Thanks,

jsf_VWP5.5.1 wrote:
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How to read system eventlog using java program in windows?

How to read system eventlog using java program in windows?
is there any java class available to do this ? or any one having sample code for this?
Your friend Zoe

Hi,
There is no java class for reading event log in windows, so we can do one thing we can use windows system 32 VBS script to read the system log .
The output of this command can be read using java program....
we can use java exec for executing this system32 vbs script.
use the below program and pass the command "eventquery"
plz refer cscript,wscript
import java.io.*;
public class CmdExec {
public static void main(String argv[]) {
try {
String line;
Process p = Runtime.getRuntime().exec("Command");
BufferedReader input =
new BufferedReader
(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
System.out.println(line);
input.close();
catch (Exception err) {
err.printStackTrace();
This sample program will list all the system log information....
Zoe

How to run .jar on linux & how to create .jar file using java?

hi, may i know how to run .jar on linux & how to create .jar file using java? Can u provide the steps on doing it.
thanks in advance.

Look at the manual page for jar:
# man jar
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How to open/read file using Java in Unix?

Hi Friends,
Can you please help me out how to open/read file using java in unix os? I have create one text file in "/home/test.txt" in unix environment. How to open the same file & read using java code?
- Hiren Modi

http://java.sun.com/docs/books/tutorial/essential/io/index.html

How to calculate call duration using java card API

Hi,
I am developing an application using Java card API. I want to calculate duration of otgoing calls in it. I am trying to start timer at the beginning of call in Call Control event. Can someone kindly check following code of Call control event? Here timerManagement function is sending proactive command for starting timer for 3 hours. Here I am asuming that maximum call will be of 3 hours. In callDisconnect event i can get current value of timer and use it to calculate duration of call. But this scenario is also not working.
Problem is that during code execution program stuck at send command (proHdlr.send();) of timmerManagement function. I am sending postAsBERTLV command before starting timer so may be reason is that it is not possible to send proactive command while phone is busy.
But I also cannot send postAsBERTLV after timerManagement function. Because it is mention in specification that "The EnvelopeResponseHandler content must be posted before the first invocation of a ProactiveHandler.send method or before the termination of the processToolkit, so that the GSM applet can offer these data to the ME (eg 9Fxx/9Exx/91xx). After the first invocation of the ProactiveHandler.send method the EnvelopeResponseHandler is no more available"
Take a look at following code
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                private void callControlService() {
                                /** @todo: Replace following sample code with your implementation */
                                ProactiveHandler proHdlr = ProactiveHandler.getTheHandler();
                                EnvelopeHandler envHdlr = EnvelopeHandler.getTheHandler();
                                ProactiveResponseHandler rspHdlr = ProactiveResponseHandler
                                                                .getTheHandler();
                                EnvelopeResponseHandler envRspHdlr = EnvelopeResponseHandler
                                                                .getTheHandler();
                                durationCount = 0;
                                 // allow call with no modifications
                                envRspHdlr.postAsBERTLV((byte)0x9F, (byte)0x00);
                                // start clock using timer
                                timerManagement(proHdlr, rspHdlr, (byte) 0x0, timer_id, tempBuffer);
                                return;
                }Please help me in this regard
Thanks
Yasir

I am also unable to start timer in call connected event. I cannot send any proactive command while phone is busy. I am using Gemalto development Suite and there simulators (Simulation 2G chain).
Is it limitation of simulator that you cannot send any proactive command while phone is busy?
Is there any other work around for getting call duration?

How to show error message using java.awt?

How to show error message using java.awt?
Which is the class corresponding to the JOptionPane?
Or I need to use Frame ?

No, JOptionPane is swing!
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How to develop discussion forums using java

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