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NETWORKING USING APPLETS

Posted on 2000-02-25
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hello friends

my question is how do i do the socket connections between a client side & server side using applets??

actually this is used for chat coding.

can i get a code for that for ref.
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Question by:s_butala
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by:Ravindra76
ID: 2557464
From: Jod        Date: Wednesday, November 17 1999 - 10:37AM CST       

Some IRC (java) clients that are free - with source code:
http://indiglo.sut.ac.th/java/ChatServer
http://www.chrisknight.com/sirc/ 
http://www.javalobby.org/jfa/projects/IRCClient.html 
Working clients (no source):  
http://heaven.riednet.wh.tu-darmstadt.de/apirc/   
http://www.racersdirect.com/RDRN/javairc/IRC.HTM 
http://www.rdrop.com/~rubin/jirc/   
http://orion.millenia.org/JAVirc/irc.html   http://www.boomersdomain.com/cgi_bin/help/irc.htm
(working versions you could download and decompile or just use for testing...)      


http://members.tripod.com/~jcode/UtilitiesChat.html 

All these are chat code in java applets.

U will get good handle
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Expert Comment

by:vladi21
ID: 2557520
more Info:

look
java how-to IO part 1
http://tactika.com/realhome/javaht/java-f1.html

better use HTTP
Reads From A URL : example
http://www.mindspring.com/~david.dagon/applets/ReadsFromURL.html

HTTP Trace Applet
http://www.idssoftware.com/demos/trace.html

Firewall Access in Java Applets
http://www.idssoftware.com/fwapplet.html


Working with a Server-Side Application
http://java.sun.com/docs/books/tutorial/applet/practical/server.html

Using a Server to Work Around Security Restrictions
http://java.sun.com/docs/books/tutorial/applet/practical/workaround.html

Frequently Asked Questions - Java Security
http://java.sun.com/sfaq/ 
What Applets Can and Can't Do
http://java.sun.com/docs/books/tutorial/applet/overview/security.html 
Security Restrictions
http://java.sun.com/docs/books/tutorial/applet/practical/security.html 

Creating Signed, Persistent Java Applets
http://www.ddj.com/articles/1999/9902/9902h/9902h.htm 

CGI at server side

Netscape FAQ:
How do I access Servlets or CGI programs from Java?
Using the QUERY method (i.e. the calling parameters are encoded in the URL), it is quite easy:
         URLConnection connect ( new URL("http:\\me\mycgi.sh") ).getConnection();
         PrintStream ps = new PrintStream(connect.getOutputStream());
         connection.setdoOutput(true);    // defaults to false
         ps.print(myPostData);
         ps.close();             // very important to close before reading
         InputStream is = new PrintStream(connect.getInputStream());
         // read the results

Note: URLConnection() is an abstract class whose sub-class is usually supplied by the environment (browser).
Some browsers allow output without calling "doOutput(true)", which violates the Java spec and may be confusing
when code works one place and not another.

POST:
http://www.javaworld.com/javatips/jw-javatip34.html 
http://www.javaworld.com/javatips/jw-javatip41.html 
---
http://tactika.com/realhome/javaht/java-n1.html#n4
Talk to a CGI/Servlet

U can use servlet at server side

What are servlets?

  Servlets are server-side Java applications, as opposed to
  client-side applets or standalone applications. While
  servlets are compatible with many different types of servers,
  typically they are used in web servers, as a replacement for
  CGI scripts or Active-Server Pages (ASP).

  Java servlets offer many advantages over other forms of
  server-side processing. Apart from the obvious (they are
  written in the Java programming language, a big plus after
  all), servlet based applications are far easier to write
  than CGI scripts. There's no need to write code for parsing
  HTTP request parameters, as this code is provided by the
  javax.servlet.http package. You have access to the entire
  Java API, with no networking restrictions (making servlets
  far more attractive than applets). There are also performance
  increases over CGI scripts, as servlets persist over time,
  and do not create a new process for every connection.

http://www.as400.ibm.com/developer/java/documents/servlet1.html


Purple Servlet FAQ  http://www.purpletech.com/java/servlet-faq/
http://www.newatlanta.com/servlets/servlet-faq.html 
http://www.dmoz.org/Computers/Programming/Languages/Java/Runtime_Environments/Servlets/faq.html

The Servlet home page on the Javasoft website
http://java.sun.com/products/java-server/servlets/
http://www.coolservlets.com/

Servlet Essentials by Stefan Zeiger
http://www.novocode.com/doc/servlet-essentials/

Paul Flavin's Servlet Resources page
http://www.frontiernet.net/~imaging/servlets_intro.html
http://oop.rosweb.ru/cetus/oo_java_servlets.html
http://dmoz.org/Computers/Programming/Languages/Java/Runtime_Environments/Servlets/


Applet and Servlet Communication
http://www.j-nine.com/pubs/applet2servlet/Applet2Servlet.html
http://developer.java.sun.com/developer/qow/archive/53/index.html

How can my applet communicate with my servlet?
It's pretty straightforward. You can use the java.net.URLConnection and java.net.URL classes to open a standard HTTP connection to the web server. The server then passes this information to the servlet in the normal way. Basically, the applet pretends to be a web browser, and the servlet doesn't know the difference. (Of course, you can write a servlet that is only called from your applet, in which case it *does* know the difference...)

For more detail, you can see the Sun Web Server FAQ Questions C8 and C9. Also, Chad Darby has an article with source code on the subject. And Netscape DevEdge Online has a similar article - Applet-to-Servlet Communication for Enterprise Applications skip to the "Communication Tactics" section to get to the good part.

Applet-to-Servlet Communication for Enterprise Applications
http://developer.netscape.com/viewsource/fields_servlet/fields_servlet.html


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Author Comment

by:s_butala
ID: 2557522
dear ravindra

the sites which u have mentioned does'not contain the chat code.
can u cut paste for me?
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by:Ravindra76
ID: 2557557
ravindra76 changed the proposed answer to a comment
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Author Comment

by:s_butala
ID: 2557604
dear ravidra
where are the comments??
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