ok first of all ... sample code
Sending info from applet to servlet :
// make call to servlet server
URL url = null;
try {
url = new
URL("http://www.my.com/servlets/ImageSoftware.ImageProcessing"); // point
towards the servlet u want to talk to
}
catch (MalformedURLException e) { System.out.println(e.getMessage()); }
Properties props = new Properties();
// set arguments for servlet to receive in doGet
props.put("Area", "2");
props.put("ID", "59849");
Object obj = null;
try {
InputStream in = sendGetMessage(props, url);
// open connection to servlet
ObjectInputStream result = new ObjectInputStream(in);
// accept the serialized object returned from the servlet
obj = result.readObject();
}
catch (IOException i) { System.out.println(i.getMessage()); }
catch (ClassNotFoundException c) { System.out.println(c.getMessage()); }
d = (Designer)obj;
// type cast to what object type should be
// this is the sendGetMessage Func used above
public InputStream sendGetMessage(Properties args, URL u) throws
IOException {
String argString = ""; // default
URL servlet = u;
if (args != null) {
argString = "?" + toEncodedString(args);
}
URL url = new URL(servlet.toExternalForm() + argString);
// Turn off caching
URLConnection con = url.openConnection();
con.setUseCaches(false);
return con.getInputStream();
}
Sending info from servlet to applet
Just use this function to send a serialized object to the servlets doPost
(Implement Serializable package in ure object)
public void sendPostMessage(Serializable obj) throws IOException {
URL url = null;
try {
url = new
URL("http://www.my.com/servlets/ImageSoftware.ImageProcessing");
}
catch (MalformedURLException e) { System.out.println(e.getMessage()); }
URLConnection con = url.openConnection();
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
con.setRequestProperty("Content-Type",
"java-internal/" + obj.getClass().getName());
ObjectOutputStream out = new ObjectOutputStream(con.getOutputStream());
out.writeObject(obj);
out.flush();
out.close();
con.getInputStream();
}
.... and the servlet accepts the object like this :
public void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
ObjectInputStream in = new ObjectInputStream(request.getInputStream());
// accept the image wrapper object
ImageWrapper imWrap = null;
(ImageWrapper is just the name of my class)
try { imWrap = ((ImageWrapper) (in.readObject())); }
catch (ClassNotFoundException e) { Utils.trace(e.getMessage()); }
}
if u have any questions please .. do not hesitate to ask.
on ure second point ... i need to know a few things .. like :
is it a stand alone app
is it run inside a browser
is it run outside a browser
what exactly do u want to do with it ??
Paul
-----Original Message-----
From: Julie liu <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Friday, September 24, 1999 5:58 PM
Subject: Re: Applet-Servlet Communication
>No, I didn't. If you can give me some code example, I appreciate.
>BTW, do you know how to keep the applet at the top all the time (I mean the
>applet is standlone and can't be hidden)?
>
>Julie.
>
>>have u tried passing serialized objects between the applet and servlet and
>>vice versa ?
>>If not .. i'm currently working on a project that does so ... i can give u
>>some code examples.
>>-----Original Message-----
>>From: Julie liu <[EMAIL PROTECTED]>
>>To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>>Date: Friday, September 24, 1999 4:26 PM
>>Subject: Re: Applet-Servlet Communication
>>
>>
>> >Can S.B Help me?
>> >
>> >I would like to let the servelet and applet communicate with each other,
>> >actually I would like to use servelet to control the life time of
applet,
>>is
>> >that possible? and how can I keep the applet at the top all the time?
>> >
>> >Julie
>
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