Entry

How to send data from servlet to javascript variables

Mar 28th, 2008 18:01
ha mo, Joseph Ess, HARI K, www.javasoft.com, Java Servlet Programming (Hunter and Crawford 1998)

Javascript can access public methods on embedded applets, so my script 
invokes a method on an applet which uses the java.net.URL class to 
contact the servlet (see the Java API for details on URL and 
URLConnection, exception handling code has been ommitted here):  	

 url = new URL(<servlet URL>);
 conn = url.openConnection();    
 DataOutputStream out = new DataOutputStream(conn.getOutputStream());
 out.writeBytes(args);
 out.flush();
 out.close();

Now, the applet reads in the reply from the servlet and returns the 
reply text to the Javascript caller for processing. 

 InputStream is = conn.getInputStream();
 DataInputStream in = new DataInputStream(new BufferedInputStream(is));
 String str = in.readLine();
 in.close();
 return str;

One caveat:  when the returned String pops back up in your Javascript 
code, it will be a Java, not a Javascript string.  To parse using 
Javascript, you will need to create a Javascript string:

str = new String(anApplet.getAppletInfo())



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