spring mvc中的@PathVariable是用来获得请求url中的动态参数的，十分方便，复习下： 

               @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";               }          }
@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";
     }
}