Scientists Have Discovered a New Activity in Brain Our Cells
Posted by Venkatt Guhesan on March 27, 2017
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![](<p>Sometimes we need to forward to a servlet or resource that’s outside of Wicket such as a servlet. Here’s how:</p>
<p>1. Modify your web.xml to define your servlet as well as your Wicket application “ignorePaths” init-param:</p>
<p>[sourcecode language="xml"]<br />
<?xml version="1.0" encoding="UTF-8"?><br />
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"><br />
<web-app><br />
<display-name>Wicket Example</display-name><br />
<filter><br />
<filter-name>MyApplication</filter-name><br />
<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class><br />
<init-param><br />
<param-name>applicationClassName</param-name><br />
<param-value>com.gu.MyApplication</param-value><br />
</init-param><br />
<init-param><br />
<param-name>wicket.configuration</param-name><br />
<param-value>deployment</param-value><br />
</init-param><br />
<init-param><br />
<param-name>ignorePaths</param-name><br />
<param-value>images/,s/</param-value><br />
</init-param><br />
</filter><br />
<filter-mapping><br />
<filter-name>MyApplication</filter-name><br />
<url-pattern>/*</url-pattern><br />
</filter-mapping><br />
<servlet><br />
<servlet-name>SomeServlet</servlet-name><br />
<servlet-class>com.gu.SomeServlet</servlet-class><br />
</servlet><br />
<servlet-mapping><br />
<servlet-name>SomeServlet</servlet-name><br />
<url-pattern>/s/koolkat.do</url-pattern><br />
</servlet-mapping><br />
</web-app><br />
[/sourcecode]</p>
<p>The first observation is that Wicket is running as a Filter and not a Servlet. Second, the init-param – “ignorePaths” says that anything in the “/images” and “/s/*” will be ignored by Wicket Filter and passed along downstream.</p>
<p>2. Next in your Wicket Form, within your onSubmit method override you can do the following:</p>
<p>[sourcecode language="Java"]<br />
class TestForm extends Form(id){<br />
@override<br />
public TestForm(String id, SomeFormModel ghfm)<br />
{<br />
//Code removed<br />
}<br />
@override<br />
public onSubmit()<br />
{<br />
String url = "/s/koolkat.do"; //some url within the same web-context<br />
getRequestCycle().setRequestTarget(new RedirectRequestTarget(url));<br />
}<br />
}<br />
[/sourcecode]</p>
<p>Notice that the url field <strong>does not</strong> contain the “ContextPath”. Wicket takes care of that in the background. On the other hand, suppose you wanted to redirect to a URL ourside of your web context or to an external site then you would set the variable like this.</p>
<p>[sourcecode language="Java"]<br />
String url = "https://mythinkpond.wordpress.com/2009/11/13/forwarding-to-a-url-from-wicket/"; //or<br />
url = "http://myserver:port/othercontext/someurl";<br />
[/sourcecode]</p>
<p>On some rare occasions, you might want to get the servlet Request Dispatcher to forward a request. For that it gets a little tricky.</p>
<p>1. In your class you want to grab the “HttpServletResponse”. I’ve been unsuccessful in getting it in the class.<br />
[sourcecode language="Java"]<br />
class xyz extends WebPage{<br />
public xyz()<br />
{<br />
HttpServletResponse response = getWebRequestCycle().getWebResponse().getHttpServletResponse();<br />
//additional code<br />
xyxForm thisForm = new xyzForm(thisModel, response);<br />
}<br />
}</p>
<p>class xyzForm extends Form{<br />
HttpServletResponse response;</p>
<p> public xyzForm(xyzModel model, HttpServletResponse thisResponse)<br />
{<br />
response = thisResponse;<br />
}</p>
<p> public onSubmit() {<br />
HttpServletRequest request = getWebRequest().getHttpServletRequest();<br />
//additional code here<br />
getWebRequest().getHttpServletRequest().getRequestDispatcher(url).forward(request, response);<br />
}<br />
}<br />
[/sourcecode]</p>
<blockquote><p>Please note that the above code is pseudo-code and not actual code because I was writing it in Scala and not Java. But for the audience, I’m trying to express it in Java so that it can have the greatest impact.</p></blockquote>
<p>That’s it! Happy Coding!</p>
<blockquote><p>If you find this article useful, consider signing up for my RSS feed or Email Newsletter. See links on the right side.</p></blockquote>
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