如何在Spring MVC中基于控制器和操作方法创建URL？

Question

I am using Spring MVC 3.0

I have a guestbook.jsp page where I want to create a link that points to GuestBookController's login method.

This is a simple task that most web frameworks handle this (eg grails does it with g:link tag) but I couldn't find any documentation on this in the official SpringMVC docs.

So I am scratching my head - Is this functionality in some tag library? Does the framework expose it? Do I have to extend the framework to get this to work?

Note, I am not taking about hardcoding the url (which is an obvious but weak solution) but rather generating it based on controller and action name.

UPDATE : Spring MVC doesn't provide this functionality. There is a JIRA ticket though. You can vote here https://jira.springsource.org/browse/SPR-5779

Answer 1

The short answer is no, you can't do this with Spring MVC currently.

It's a shame because you can do this in other frameworks including Grails (which uses Spring MVC under the hood).

See the discussion here which includes a link to a Spring feature request to add this (vote for it!)

Answer 2

Spring MVC uses the standard JSTL tags in JSPs so:

<c:url value="/guestBook.html" var="guestBookLink" />
<a href="${guestBookLink}">Guest Book</a>

In your controller:

@RequestMapping(value = "/guestBook")
public String handleGuestBook() { ... }

Answer 3

For a long time I have thought about implementing something like this using CGLib proxies but was too lazy. It appears Spring HATEOS library will allow you to do it the proxy way I wnated to and variety of other ways.

Answer 4

Annotate your login method with @RequestMapping, like so:

@Controller
public class GuestBookController {
  ...
  @RequestMapping(value="/mycontextroot/login", method = RequestMethod.GET)
  public String login() {
    ...
  }
  ...
}

Then, in your JSP, create a link something like this:

<c:url var="loginlink" value="/mycontextroot/login.html">
</c:url>
<a href="${loginlink}">Login</a>

This assumes that your dispatcher servlet is looking for *.html URLs.