spring mvc中的@PathVariable获得请求url中的动态参数

 @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";    } }