Package org.apache.wicket.protocol.http

Class WicketServlet

  • All Implemented Interfaces:
    Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig
    Direct Known Subclasses:
    ReloadingWicketServlet
    public class WicketServlet
extends javax.servlet.http.HttpServlet
    Please use WicketFilter if you require advanced chaining of resources.

    Servlet class for all wicket applications. The specific application class to instantiate should be specified to the application server via an init-params argument named "applicationClassName" in the servlet declaration, which is typically in a web.xml file. The servlet declaration may vary from one application server to another, but should look something like this: 

     <servlet>
   <servlet-name>MyApplication</servlet-name>
   <servlet-class>org.apache.wicket.protocol.http.WicketServlet</servlet-class>
   <init-param>
     <param-name>applicationClassName</param-name>
     <param-value>com.whoever.MyApplication</param-value>
   </init-param>
   <load-on-startup>1</load-on-startup>
 </servlet>
    Note that the applicationClassName parameter you specify must be the fully qualified name of a class that extends WebApplication. If your class cannot be found, does not extend WebApplication or cannot be instantiated, a runtime exception of type WicketRuntimeException will be thrown.

    As an alternative, you can configure an application factory instead. This looks like: 

     <init-param>
   <param-name>applicationFactoryClassName</param-name>
   <param-value>teachscape.platform.web.wicket.SpringApplicationFactory</param-value>
 </init-param>
    and it has to satisfy interface IWebApplicationFactory.

    The servlet can also be configured to skip certain paths, this is especially useful when the servlet is mapped to /* mapping: 

     <init-param>
   <param-name>ignorePaths</param-name>
   <param-value>/images/products/,/documents/pdf/</param-value>
 </init-param>

    When GET/POST requests are made via HTTP, a WebRequestCycle object is created from the request, response and session objects (after wrapping them in the appropriate wicket wrappers). The RequestCycle's render() method is then called to produce a response to the HTTP request.

    If you want to use servlet specific configuration, e.g. using init parameters from the ServletConfigobject, you should override the init() method of GenericServlet. For example: 

     public void init() throws ServletException
 {
     ServletConfig config = getServletConfig();
     String webXMLParameter = config.getInitParameter("myWebXMLParameter");
     ...

    In order to support frameworks like Spring, the class is non-final and the variable webApplication is protected instead of private. Thus subclasses may provide their own means of providing the application object.

    Author:
    Jonathan Locke, Timur Mehrvarz, Juergen Donnerstag, Igor Vaynberg (ivaynberg), Al Maw
    See Also:
    RequestCycle, Serialized Form

    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected WicketFilter wicketFilter
      The WicketFilter where all the handling is done

    • Constructor Summary

      Constructors 
      Constructor Description
      WicketServlet()  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void destroy()
      Servlet cleanup.
      void doGet​(javax.servlet.http.HttpServletRequest servletRequest, javax.servlet.http.HttpServletResponse servletResponse)
      Handles servlet page requests.
      void doPost​(javax.servlet.http.HttpServletRequest servletRequest, javax.servlet.http.HttpServletResponse servletResponse)
      Calls doGet with arguments.
      void init()
      Servlet initialization
      protected WicketFilter newWicketFilter()  

      • Methods inherited from class javax.servlet.http.HttpServlet

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

      • Methods inherited from class javax.servlet.GenericServlet

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

    • Method Detail

      • doGet

        public final void doGet​(javax.servlet.http.HttpServletRequest servletRequest,
                        javax.servlet.http.HttpServletResponse servletResponse)
                 throws javax.servlet.ServletException,
                        IOException
        Handles servlet page requests.
        Overrides:
        doGet in class javax.servlet.http.HttpServlet
        Parameters:
        servletRequest - Servlet request object
        servletResponse - Servlet response object
        Throws:
        javax.servlet.ServletException - Thrown if something goes wrong during request handling
        IOException

      • doPost

        public final void doPost​(javax.servlet.http.HttpServletRequest servletRequest,
                         javax.servlet.http.HttpServletResponse servletResponse)
                  throws javax.servlet.ServletException,
                         IOException
        Calls doGet with arguments.
        Overrides:
        doPost in class javax.servlet.http.HttpServlet
        Parameters:
        servletRequest - Servlet request object
        servletResponse - Servlet response object
        Throws:
        javax.servlet.ServletException - Thrown if something goes wrong during request handling
        IOException
        See Also:
        doGet(HttpServletRequest, HttpServletResponse)

      • init

        public void init()
          throws javax.servlet.ServletException
        Servlet initialization
        Overrides:
        init in class javax.servlet.GenericServlet
        Throws:
        javax.servlet.ServletException

      • destroy

        public void destroy()
        Servlet cleanup.
        Specified by:
        destroy in interface javax.servlet.Servlet
        Overrides:
        destroy in class javax.servlet.GenericServlet