title: Way to get information from url and save it
body: <p>I'm going to create a membership function.
  I want to get a level value through this url<code>http:/user/signup?level=1</code>. This level value will be automatically saved when signing up for membership, and we will try to fill out the rest of the information, such as e-mail and ID, by ourselves.
  I've even completed the membership code that I fill out myself. Should I make a separate function to get a level and save it?</p>
  <pre><code>@Controller
  @RequestMapping(&quot;/user&quot;)
  public class UserController {
  
      @Autowired
      private UserService userService;
      
      @GetMapping(&quot;/signup&quot;)
      public String createForm(Model model){
          model.addAttribute(&quot;UserSignupDto&quot;, new UserSignupDto());
          return &quot;user/Signup&quot;;
      }
  </code></pre>