ansaurus

Question

Answer 1

+1 A:

First of all, your web-inf directory must be in upper-case (WEB-INF).

Basic web.xml looks like this:

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app 
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 
    "http://java.sun.com/dtd/web-app_2_3.dtd"&gt;

<web-app>
    <servlet>
      <!-- 
        This is arbitrary name for your servlet,
        used in servlet-mapping below
       -->
      <servlet-name>HelloWorld</servlet-name>

      <!-- Name of your servlet class -->
      <servlet-class>HelloWorldServlet</servlet-class>
    </servlet>

    <servlet-mapping>
      <servlet-name>HelloWorld</servlet-name>

      <!--
         Here you say location (under context) where your servlet
         can receive requests.
       -->
      <url-pattern>/hello-world</url-pattern>
    </servlet-mapping>
</web-app>

Your web.xml must be saved in <your-app>/WEB-INF/web.xml path.

Now whenever browser will access http://localhost/HelloWorld/hello-world on your server, your servlet we be called, because it is mapped to /hello-world, and because your application is deployed in HelloWorld directory (thus mapped to /HelloWorld context).

Peter Štibraný 2009-07-11 18:28:56

Hi. I did everything as you said, now I'm getting a different error. When I pasted my code to this page I forog the first line : "package HelloWorldServlet;"Does it make things different? If not I'll post the erros I'm getting. Thanks

2009-07-12 13:44:54

@Charles - Adding a package changes the fully qualified class name of the servlet to HelloWorldServlet.HelloWorldServlet which needs to be in the file WEB-INF/classes/HelloWorldServlet/HelloWorldServlet.class

McDowell 2009-07-12 13:54:04

It worked, thank you!!

2009-07-12 14:07:53

Imagine that the servlet described uses a method that belongs to a class (writeLog) included in the HelloWorldServlet package. Shold I put the writeLog.class in the same folder than HelloWorldServlet.class? Do I need to modify anything else? Thanks

2009-07-14 18:46:23

Yes. Put it into same folder. You don't need to modify anything else.

Peter Štibraný 2009-07-14 19:16:35

Is it possible to have several classes which extends HttpServlet in the same package? I tried that but I think I'm getting an error when I introduce that in web.xml.I don't know if I can do that in the same package (how should I modify web.xml then?) or if I define this class in a new package (web.xml is still a problem for me). Thanks

2009-07-15 20:54:25

Yes, it is possible. If you add more servlets (classes that extend HttpServlet), you need to also add `servlet` and `servlet-mapping` elements into web.xml for each new servlet. Btw, it would be better to ask new questions not via comments, but by creating new question directly. Only *I* am notified that new comment was added to my answer, but new *real questions* are prominently displayed on main page ... you would get answer faster ;-)

Peter Štibraný 2009-07-16 04:49:30

It doesn't matter that new servlets are in same package. What matters is full name of class -- you always need to write that name into `servlet/servlet-class` element. Full name of class includes package name, so if your `Servlet1` and `Servlet2` are in package `myservlets`, you will need to add new `servlet` element twice, first time with `<servlet-class>myservlets.Servlet1</servlet-class>`, and once with `<servlet-class>myservlets.Servlet2</servlet-class>`

Peter Štibraný 2009-07-16 04:52:47

Answer 2

+1 A:

First you map the Servlet class to a name. Then you map the name to a url-pattern. The url pattern can be a single path or it can be a "globbing" pattern like /path/* or just /*

Something like:

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="TestApp" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"&gt;
    <display-name>Test App</display-name>
    <servlet>
        <servlet-name>HelloWorld</servlet-name>
        <servlet-class>HelloWorldServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>HelloWorld</servlet-name>
        <url-pattern>/hello</url-pattern>
    </servlet-mapping>
</web-app>

geofflane 2009-07-11 18:29:26

ansaurus

tags:

views:

answers:

Tomcat configuration for servlets

related questions