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Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

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Matching Clean URLs with Tomcat/Spring

From: "andrew cooke" <andrew@...>

Date: Sat, 11 Feb 2006 16:50:37 -0300 (CLST)

Martini in the Spring forums has done a huge amount of work trying to
clear up some confusion I (and at least one other person) had about
matching "any" URL - the root of the problem being that finally you render
the page with a jsp page, which itself is dispatched by Tomcat (and so
matches the "any" servlet, looping or crashig).

The thread starts at
http://forum.springframework.org/showthread.php?t=21840 but the answer is
at the end of this comment (page 2) -
http://forum.springframework.org/showpost.php?p=50421&postcount=20

  Anyways, I tried copy/pasting this configuration over to my own web.xml.
  But that didn't work too well, as it seems "/*" has higher precedence
  than "*.jsp". So I took a new look at the Servlet spec, only to find out
  that the "default pattern" is "/", not "/*". I changed DispatcherServlet's
  mapping from /* to just /, and then it worked. Out of curiousity, I then
  removed the explicit *.jsp mapping (to Jasper's JspServlet) to see if that
  would work as well. And it did.

Andrew

Rewriting Filter

From: "andrew cooke" <andrew@...>

Date: Sat, 11 Feb 2006 22:31:58 -0300 (CLST)

In the same thred, Dave Hewitt posted a link to this rewriter -
http://tuckey.org/urlrewrite/

Now that I finally understand what's happening, that does indeed look like
the best solution.

Final Tomcat/Spring/UrlRewriter Configuration

From: "andrew cooke" <andrew@...>

Date: Sun, 12 Feb 2006 10:41:00 -0300 (CLST)

OK, this seems to be the best way to get clean URLs with Tomcat and Spring:


urlrewrite.xml

<urlrewrite>
  <rule>
    <note>any url without a final file name goes to index</note>
    <from>^([^?]*)/(\?.*)?$</from>
    <to last="false">$1/index$2</to>
  </rule>
  <rule>
    <note>any url without a final file extension goes to .dynamic</note>
    <from>^([^?]*)/([^?/\.]+)(\?.*)?$</from>
    <to last="false">$1/$2.dynamic$3</to>
  </rule>
</urlrewrite>


web.xml (simplified)

<web-app 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/web-app_2_4.xsd"
  version="2.4">

  <filter>
    <filter-name>UrlRewriteFilter</filter-name>
    <filter-class>
       org.tuckey.web.filters.urlrewrite.UrlRewriteFilter
    </filter-class>
    <init-param>
      <param-name>logLevel</param-name>
      <param-value>DEBUG</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>UrlRewriteFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <servlet>
    <servlet-class>
      org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <url-pattern>*.dynamic</url-pattern>
  </servlet-mapping>

</web-app>


Code used to generate value of current form (for referencing in JSP):

public class InitialUrlInterceptor extends HandlerInterceptorAdapter {

  private String dropPostfix = ".dynamic";

  public void setDropPostfix(String dropPostfix) {
    this.dropPostfix = dropPostfix;
  }

  @Override
  public boolean preHandle(HttpServletRequest req,
                           HttpServletResponse res,
                           Object handler) {
    String path = SessionUtils.getRelativePath(req);
    if (path.endsWith(dropPostfix))
      path = path.substring(0, path.length() - dropPostfix.length());
    req.setAttribute("requestUrl", path);
    return true;
  }

}

tomcat default servlet patten matching -- thank you!

From: andrew cooke <andrew@...>

Date: Thu, 28 Jan 2010 00:48:29 -0300

[Sorry for the delay in approving this]

Date: Mon, 16 Nov 2009 22:25:40 -0500
From: chris marx <chrismarx@...>

  [...] ", as it seems "/*" has higher precedence
  than "*.jsp". So I took a new look at the Servlet spec, only to find out
  that the "default pattern" is "/", not "/*"."

brilliant thanks so much for posting this saved me so much time!!!!!!

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