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Using Regular Expressions to Evaluate Path Variables in a Spring MVC controller

Sometime you may want to process the URI in the request and assign values to several path variables instead of a single one. This can easily be achieved with regular expressions on the URI itself within the @RequestMapping.

 

The syntax is {varName:regex} for the parsed URI path variable. For example suppose we want to provide an HTTP GET over this URI: /jars/log4j-1.2.16.jar, but we want to allow any jar name, version and extension with the format name-version.extension and we also want to get each of these path variables in a separate argument in our controller handler method. We can do it this way:

 

 

@Controller
public final class MyController {
     @RequestMethod("/jars/{artifact:[a-z-]+}-{version:\d\.\d\.\d}.{extension:\.[a-z]}")
     public void handle(@PathVariable String artifact, @PathVariable String version, @PathVariable String extension) {
          ...
     }
}

 Simple and useful.

 

Post author: Amir Kibbar

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