July 2002
Intermediate to advanced
608 pages
15h 46m
English
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Running a Servlet with Jython
Credit: Brian Zhou
Problem
You need to code a servlet using Jython.
Solution
Java (and Jython) is most often deployed server-side, and thus servlets are a typical way of deploying your code. Jython makes them easy to use:
import java, javax, sys
class hello(javax.servlet.http.HttpServlet):
def doGet(self, request, response):
response.setContentType("text/html")
out = response.getOutputStream( )
print >>out, """<html>
<head><title>Hello World</title></head>
<body>Hello World from Jython Servlet at %s!
</body>
</html>
""" % (java.util.Date( ),)
out.close( )
returnDiscussion
This is no worse than a typical JSP! (See http://jywiki.sourceforge.net/index.php?JythonServlet
for setup instructions.) Compare this recipe to the equivalent Java
code; with Python, you’re finished coding in the
same time it takes to set up the framework in Java. Note that most of
your setup work will be strictly related to Tomcat or whatever
servlet container you use; the Jython-specific work is limited to
copying jython.jar to the
WEB-INF/lib subdirectory of your chosen servlet
context and editing WEB-INF/web.xml to add
<servlet> and
<servlet-mapping> tags so that
org.python.util.PyServlet serves the
*.py <url-pattern>.
The key to this recipe (like most other Jython uses) is that your Jython scripts and modules can import and use Java packages and classes as if the latter were Python code or extensions. In other words, all of the Java libraries that you could use with Java code are ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.