Applet to JSP Communication

The simplest way is to use the showDocument method of your Applet's AppletContext to pass the input to the JSP in a GET request:String req = "some.jsp?var1=val1&var2=val2&var3=val3";

getAppletContext().showDocument(req, targetWindow);

How complex is the data you're needing to send?

cafal at 2007-6-29 1:31:41 >

You can do it all in one page; do the request.getParameter() call in your JSP and see if you have a key value (say, "search"); if so, retrieve the rest of your data and then perform the search. Write the code to set the applet parameters based on whether or not the search was performed.

The getAppletContext().showDocument(URL) method does take place in the Applet, and I'm afraid I represented it to you incorrectly:String s = "some.jsp?var1=val1&var2=val2&var3=val3";

URL url = new URL(s);

getAppletContext().showDocument(url);

//or getAppletContext().showDocument(url, windowNameAsString);

cafal at 2007-6-29 1:31:41 >

That can be a little more complicated; your JSP will be sending info to the Applet by setting <PARAM/> tags in the body of the page, and you have to put all of your array data in one or more of these tags.

I'm not sure just how long the VALUE attribute of the tag is allowed to be, but it's relatively long. Place all of your data for your array into a single String with some delimiter (a comma in this example):<PARAM NAME="SomeVal" VALUE="one,two,three,four,five"/>

Then, in your applet, pull out the parameter and create your array with a StringTokenizer:String s = "";

String[] vals;

public void init(){

s = getParameter("SomeVal");

StringTokenizer st = new StringTokenizer(s, ",");

vals = new String[st.countTokens()];

int count=0;

while(st.hasMoreTokens()){

vals[count] = st.nextToken();

count ++;

}

}

That will pull your array into your Applet. This will not work for complex data, but should handle Strings and all primitive types (you can convert the Strings to whatever type you need using the appropriate wrapper-class methods.) If you're just building a drop-down, this should work fine.

cafal at 2007-6-29 1:31:41 >