Tomcat

 
 
Tomcat is a servlet container and is the reference implementation for the Java Servlet en JaveServer Pages (JSP) technologies. It does not contain an EJB container!

Here below an overview of Tomcat version vs. Servlet/JSP specification.

Tomcat version Servlet/JSP Spec
5.5.4 2.4/2.0
4.1.31 2.3/1.2
3.3.2 2.2/1.1

The latest Tomact version can be downloaded from: http://jakarta.apache.org/tomcat

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Quick guides






Access Servlets.



Information
There are two methods to access servlets.

Operating system used
Windows XP Home Edition Version 5.1 SP 2

Software prerequisites
Tomcat 4.1.31.


Procedure
  1. First create a simple servlet HelloWorldServlet.java and deploy the HelloWorldServlet.class file in:

    ..\Tomcat 4.1\webapps\<myapp>\WEB-INF\classes\com\mobilefish\main\servlets

    Note: In this example <myapp> is the web application context name.

    package com.mobilefish.main.servlets;

    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.ServletException;

    import java.io.IOException;
    import java.io.PrintWriter;

    public class HelloWorldServlet extends HttpServlet {

       public void doGet(HttpServletRequest request, HttpServletResponse response)
          throws IOException, ServletException{
          PrintWriter out = response.getWriter();
          out.println("<html>");
          out.println("<body>");
          out.println("<h1>Hello World</h1>");
          out.println("</body>");
          out.println("</html>");
       }
    }


  2. Method 1: Edit file ..\Tomcat 4.1\webapps\<myapp>\WEB-INF\web.xml

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

    <!DOCTYPE web-app
      PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
      "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

    <web-app>
       <display-name>Demo</display-name>

       <servlet>
          <servlet-name>HelloWorldServlet</servlet-name>
          <servlet-class>com.mobilefish.main.servlets.HelloWorldServlet</servlet-class>
       </servlet>

       <servlet-mapping>
          <servlet-name>HelloWorldServlet</servlet-name>
          <url-pattern>/hello</url-pattern>
       </servlet-mapping>

    </web-app>


    Restart Tomcat and access the servlet using url:

    http://localhost:8080/<myapp>/hello



  3. Method 2: Edit file ..\Tomcat 4.1\webapps\<myapp>\WEB-INF\web.xml

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

    <!DOCTYPE web-app
      PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
      "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

    <web-app>
       <display-name>Demo</display-name>

       <servlet>
          <servlet-name>HelloWorldServlet</servlet-name>
          <servlet-class>com.mobilefish.main.servlets.HelloWorldServlet</servlet-class>
       </servlet>

    </web-app>


    .. and edit file ..\Tomcat 4.1\conf\web.xml

    <servlet>
       <servlet-name>invoker</servlet-name>
          <servlet-class>
             org.apache.catalina.servlets.InvokerServlet
          </servlet-class>
          <init-param>
             <param-name>debug</param-name>
             <param-value>0</param-value>
          </init-param>
          <load-on-startup>2</load-on-startup>
    </servlet>
    :
    :
    <servlet-mapping>
       <servlet-name>invoker</servlet-name>
       <url-pattern>/servlet/*</url-pattern>
    </servlet-mapping>


    Restart Tomcat and access the servlet using url:

    http://localhost:8080/<myapp>/servlet/HelloWorldServlet