URL Routing in Java

Question

Coming from other web frameworks, I'm used to being able to map parts of a URL to method parameters. I know that web.xml provides a way to map an entire URL to a Servlet but is there a way to get more features out of this, such as mapping pieces of the URL to method parameters?

Answer 1

Using Spring (MVC) is overkill for this. If you don't need dependency injection, you'll be happy with redirect filter .

Answer 2

Actually, most MVC frameworks support RESTful actions (ie allow to map URLs on methods of actions): Spring MVC, Stripes , Struts 2 with the REST plugin .

If you're not using any of them, you could achieve this with URL rewriting. The UrlRewriteFilter is pretty famous and allows to implements such things. From the documentation about Method Invocation :

The standard servlet mapping that is done via web.xml is rather limiting. Only .xxx or /xxxx/ , no abilty to have any sort of smart matching. Using UrlRewriteFilter any rule when matched can be set to run method(s) on a class.

Invoke a servlet directly

 <rule> <from>^/products/purchase$</from> <run class="com.blah.web.MyServlet" method="doGet" /> </rule> 

This will invoke doGet(HttpServletRequest request, HttpServletResponse response) when the "from" is matched on a request. (remeber this method needs to be public!)

Use it to delegate cleanly to your methods

 <rule> <from>^/pref-editor/addresses$</from> <run class="com.blah.web.PrefsServlet" method="runAddresses" /> </rule> <rule> <from>^/pref-editor/phone-nums$</from> <run class="com.blah.web.PrefsServlet" method="runPhoneNums" /> </rule> 

Answer 3

我写了一个名为jurlmap的库，其中包括你要求的东西。

Answer 4

You can do such things with Spring web MVC. Their controller API can map parts of the URL to specific calls on the back end.