spring mvc中的@PathVariable

@Controller  
    public class TestController {  
         @RequestMapping(value="/user/{userId}/roles/{roleId}",method = RequestMethod.GET)  
         public String getLogin(@PathVariable("userId") String userId,  
             @PathVariable("roleId") String roleId){  
             System.out.println("User Id : " + userId);  
             System.out.println("Role Id : " + roleId);  
             return "hello";  
         }  
         @RequestMapping(value="/product/{productId}",method = RequestMethod.GET)  
         public String getProduct(@PathVariable("productId") String productId){  
               System.out.println("Product Id : " + productId);  
               return "hello";  
         }  
         @RequestMapping(value="/javabeat/{regexp1:[a-z-]+}",  
               method = RequestMethod.GET)  
         public String getRegExp(@PathVariable("regexp1") String regexp1){  
               System.out.println("URI Part 1 : " + regexp1);  
               return "hello";  
         }  
    }