330 Java Tips.pdf - FTP Server

Servlets & Servers
Q: I'm looking for a Java HTTP server framework that can be used and modified
for a project I'm going to be working on.
My boss asked me what the equivalent in Java was that IIS was in the Windows
world or Apache was in the UNIX. I've looked at Jigsaw, but am wondering if anyone
out there knows of other resources...open source would be great. Thanks in advance
for any input.
Answer: There are other pure Java web servers, like the Apache PicoServer,
Jetty (http://www.jetty.org ???). Perhaps you could take one of those to write a http
block for the Apache Server Framework avalon (http://java.apache.org/framework )
Another tip is to search sourceforge for web servers.
http://www.sourceforge.net
--
Glen Shelly
Q: I am currently running Microsoft's IIS server. I have the Java Virtual machine
installed on this system. What else will I need to run my servlet. Do need the Apache
web server instead? Will IIS support Java servlet?
Answer: You will need a Servlet Engine to run your servlets.
You can use either Allaire's JRun (http://www.jrun.com) or Tomcat
(http://jakarta.apache.org).
Both of them work with IIS.
--
Madhusudhanan Challur
Q: How can I avoid browser caching?
In an applet, I call the function showDocument to send a GET message to one of my
servlets, which sends me back a PDF file dynamically generated by this servlet.
My problem is : the browser (in this case IE) always sends me back a PDF file with
the same content.
Answer 1: There are a few possibilities to avoid this problem.
A simple workaround is to add a random number URL variable with the request, such
as "ranx" with a value of the milliseconds since midnight. This will make the request
unique and, hence, avoid browser caching.
by Duane Morse
Answer 2: There are two other response setHeader attributes you can set:
response.setHeader("pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0 )
Just in case.
Doug Schwartz
Answer 3: // for Answer 1 and 2 please go to yesterday's tip.
When you generate the PDF file, make sure you set the header to tell the browser
that the file will expire at a certain time. The browser should not cache the response
past the given time. The Java code looks something like
this:
import java.text.SimpleDateFormat;
file:///F|/350_t/350_tips/servlets_servers.htm (6 of 8) [2002-02-27 21:19:05]