December 2002
Intermediate to advanced
588 pages
25h 57m
English
Content preview from Apache: The Definitive Guide, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Writing a Servlet
Now that we have JServ running, let’s add a little servlet to it, just to show how its done. Of course, there’s already a simple servlet in the JServ package, the Hello servlet mentioned earlier; the source is in the example directory, so take a look. We wanted to do something just a little more interesting, so here’s another servlet called Simple, which shows the parameters passed to it. As always, Java requires plenty of code to make this happen, but there you are:
import java.io.PrintWriter; import java.io.IOException; import java.util.Enumeration; import java.util.Hashtable; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpUtils; public class Simple extends HttpServlet { public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { PrintWriter out; String qstring=request.getQueryString(); Hashtable query; if(qstring == null) qstring=""; try { query=HttpUtils.parseQueryString(qstring); } catch(IllegalArgumentException e) { query=new Hashtable(); String tmp[]=new String[1]; tmp[0]=qstring; query.put("bad query",tmp); } response.setContentType("text/html"); out=response.getWriter(); out.println("<HTML><HEAD><TITLE>Simple Servlet</TITLE></HEAD>"); out.println("<BODY>"); out.println("<H1>Simple Servlet</H1>"); for(Enumeration e=query.keys() ; e.hasMoreElements() ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.
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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.