javawebparts.servlet
Class RedirectReturnerServlet

java.lang.Object
  |
  +--javax.servlet.GenericServlet
        |
        +--javax.servlet.http.HttpServlet
              |
              +--javawebparts.servlet.RedirectReturnerServlet

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class RedirectReturnerServlet

extends javax.servlet.http.HttpServlet

This servlet returns a URL as defined in an XML file. It builds a collection of URIs from the config file. Each invocation of the servlet returns one of the items, either randomly (with no repeats) until all items have been shown) or in forward or reverse order. The URIs in the config file can be a complete URL (i.e., beginning with http://, https://, ftp://, etc.) or can be context-relative (i.e., beginning with a /).

Example configuration in web.xml:

<servlet>
<servlet-name>RedirectReturnerServlet</servlet-name>
<servlet-class>javawebparts.servlet. RedirectReturnerServlet</servlet-class>
<init-param>
<param-name>order</param-name>
<param-value>random</param-value>
</init-param>
<init-param>
<param-name>itemsFile</param-name>
<param-value> /WEB-INF/redirect_returner_items.xml</param-value>
</init-param>
</servlet>

<servlet-mapping>
<servlet-name>RedirectReturnerServlet</servlet-name>
<url-pattern>/redirectReturner</url-pattern>
</servlet-mapping>

Example items configuration file:

<RedirectReturnerServletItems>
<item>http://www.google.com/intl/en/images/logo.gif </item>
<item>/img/header1.gif</item>
<item>/img/mouse.gif</item>
<item>http://javawebparts.sourceforge.net/logo.jpg </item>
</RedirectReturnerServletItems>

Author:

Frank W. Zammetti.

See Also:

Serialized Form

Field Summary

private Items	items Bean that holds all our items from the file, and generally does all the work of this servlet.
private static org.apache.commons.logging.Log	log Log instance.

Fields inherited from class javax.servlet.http.HttpServlet

Fields inherited from class javax.servlet.GenericServlet

Constructor Summary

RedirectReturnerServlet()

Method Summary

void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) doGet.
void	doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) doPost.
void	init(javax.servlet.ServletConfig config) init.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

log

private static org.apache.commons.logging.Log log

Log instance.

items

private Items items

Bean that holds all our items from the file, and generally does all the work of this servlet.

Constructor Detail

RedirectReturnerServlet

public RedirectReturnerServlet()

Method Detail

init

public void init(javax.servlet.ServletConfig config)
          throws javax.servlet.ServletException

init.

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class javax.servlet.GenericServlet

Parameters:

config - ServletConfig.

Throws:

javax.servlet.ServletException - ServletException.

doGet

public void doGet(javax.servlet.http.HttpServletRequest request,
                  javax.servlet.http.HttpServletResponse response)
           throws javax.servlet.ServletException,
                  java.io.IOException

doGet. Calls doPost() to do real work.

Overrides:

doGet in class javax.servlet.http.HttpServlet

Parameters:

request - HTTPServletRequest.

response - HTTPServletResponse.

Throws:

javax.servlet.ServletException - ServletException.

java.io.IOException - IOException.

doPost

public void doPost(javax.servlet.http.HttpServletRequest request,
                   javax.servlet.http.HttpServletResponse response)
            throws javax.servlet.ServletException,
                   java.io.IOException

doPost.

Overrides:

doPost in class javax.servlet.http.HttpServlet

Parameters:

request - HTTPServletRequest

response - HTTPServletResponse

Throws:

javax.servlet.ServletException - ServletException

java.io.IOException - IOException