The @PathVariable in spring mvc is used to obtain the dynamic parameters in request url, 10 points is convenient, please review:

 @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";
   }
}