applet jsp communication

[Nidhi Nagre]

hi all
i am very new in java so please spend your few movement for this topic.
i want to run a jsp page from within an applet and evantually want to send data to jsp.

please help me with approppiate code that you have used using HttpPost and HttpGet method both.
the data is an array of string object or may be a properties object,

the url of the jsp is
Registrationform.jsp

[Ulf Dittmer]

Hello "helpNidhi OnJava"-

Welcome to JavaRanch.

On your way in you may have missed that we have a policy on screen names here at JavaRanch. Basically, it must consist of a first name, a space, and a last name, and not be obviously fictitious. Since yours does not conform with it, please take a moment to change it, which you can do right here.

As to your question, assuming that "run a JSP page" means accessing it programmatically, check out the java.net.URL examples at exampledepot.com, particularly #135 and #136. Those show POST and GET in action, respectively. For GET, the URL can contain parameters.

[Nidhi Nagre]

thanks Mr Ulf and sorry for using a fictitous name that has been updated now.

now i am going in your way.

[sudhir nim]

Here is the code which you can use to communication between applet and servlet/JSP

following code can be used at applet side :

 
 
/*
*URL to servlet
*/
 
URL serverURL = new URL(servletPath);
 
URLConnection connection = serverURL.openConnection();
/*
* Connection will be used for both input and output
*/
connection.setDoInput(true);
connection.setDoOutput(true);
 
/*
* Disable caching
*/
connection.setUseCaches(false);
 
/*
*connection will be used for transfaring serialized java objects.
*/
connection.setRequestProperty("Content-Type", "application/octet-stream");
 
ObjectOutputStream outputStream = new ObjectOutputStream(connection.getOutputStream());
 
outputStream.writeObject(request);
outputStream.flush();
outputStream.close();
 
ObjectInputStream inputStream = new ObjectInputStream(connection.getInputStream());
 
response = (Map)inputStream.readObject();
inputStream.close();
 
 
Here response is the response Map returned from servlet.
 
following code can be used in your servlet to send serializable objects to applet.
 
write this code in doXXX method of servlet.
 
ObjectOutputStream out = new ObjectOutputStream(response.getOutputStream());
Map responseMap = new HashMap();
/*
put watever objects you wants to return to applet.
This objects must be serializable.
 
responseMap.put("a", "a");
 
*/
out.writeObject(responseMap);
out.flush();
out.close();
response.setStatus(HttpServletResponse.SC_NO_CONTENT);
 

[ November 05, 2007: Message edited by: sudhir nim ]

[Nidhi Nagre]

thanks Mr sudhir

i think i have been using almost the same code for that..but i haven't written any code inside the target jsp(to which i want to cummunicate) so for.
is it compulsory to write the code bothside(applet and jsp),in fact i will do it latter.

 
     try{ 
        URL appletURL = getCodeBase();
        String strHost = appletURL.getHost();
        String strPort = String.valueOf(appletURL.getPort());
        String strProtocol = appletURL.getProtocol();
        int portNumber = Integer.parseInt(strPort);
        String strwp ="/UASProject/Registrationform.jsp";        
        URL jspURL = new URL(strProtocol,strHost,portNumber,strwp);
        URLConnection jspCon = jspURL.openConnection();
        jspCon.setUseCaches(false);
        jspCon.setDoOutput(true);
        jspCon.setDoInput(true);
        
        OutputStream outstream= jspCon.getOutputStream();
        ObjectOutputStream oboutStream = new ObjectOutputStream(outstream);
        PrintWriter out = new PrintWriter(oboutStream,true);
       // String postData= "?xmlText=" + URLEncoder.encode(genXml(),"UTF-8");       
       // out.flush();
        String strLength = String.valueOf(oboutStream);
        jspCon.setRequestProperty("Content-Length",strLength);
        jspCon.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
        oboutStream.writeObject(std_details);    
        oboutStream.flush();
        oboutStream.close();
        URL tempURL = new URL(String.valueOf(jspURL));
        //System.out.println(String.valueOf(jspURL)+" "+String.valueOf(tempURL));
        getAppletContext().showDocument(tempURL,"_blank");     
        
 
     }catch(Exception e)  
       {System.out.println(e+" "+e.getCause());}
 

after working with this i got the follwing exception
java.lang.IllegalStateException: Already connected
i looked around this but couldn't able to solve.

guide me to make a successful connection