SpringJava如何使用控制器

我对Spring框架一无所知。我的任务是在spring上制作电话簿应用程序。我需要注册和授权，还有我的电话簿。我有两个控制器，第一个用户控制器控制授权和注册

@Controller
public class UserController {
@Autowired
private UserService userService;
@Autowired
private SecurityService securityService;
@Autowired
private UserValidator userValidator;

@RequestMapping(value = "/registration", method = RequestMethod.GET)
public String registration(Model model) {
    model.addAttribute("userForm", new User());
    return "registration";
}

@RequestMapping(value = "/registration", method = RequestMethod.POST)
public String registration(@ModelAttribute("userForm")
                                       User userForm, BindingResult bindingResult, Model model) {
    userValidator.validate(userForm, bindingResult);

    if (bindingResult.hasErrors()) {
        return "registration";
    }

    userService.save(userForm);

    securityService.autoLogin(userForm.getUsername(), userForm.getConfirmPassword());

    return "redirect:/welcome";
}

@RequestMapping(value = "/login", method = RequestMethod.GET)
public String login(Model model, String error, String logout) {
    if(error!=null) {
        model.addAttribute("error", "Username or password is incorrect.");
    }

    if (logout!=null) {
        model.addAttribute("message", "logged out successfully");
    }

    return "login";
}

@RequestMapping(value = {"/", "/welcome"}, method = RequestMethod.GET)
public  String welcome(Model model) {
    return "welcome";
}

@RequestMapping(value = "/admin", method = RequestMethod.GET)
public String admin(Model model) {
    return "admin";
}
}

和ContactController，用于控制我的功能（添加、删除、编辑和显示联系人）

}

当我尝试验证或注册时。新用户我有这样的错误：

org.springframework.web.util.NestedServletException:请求处理失败；嵌套异常为java.lang.IllegalStateException:为HTTP路径“”映射的不明确处理程序方法：{public java.lang.String kz.adilka.springsecurity.app.controller.UserController.admin（org.springframework.ui.Model），public java.lang.String kz.adilka.springsecurity.app.controller.ContactController.listContactsForAdmin（org.springframework.ui.Model）}

---

它说我的映射管理页面有问题。但对我来说似乎没问题，或者可能我错过了smth

原因是你没有为你的控制器设置控制器值，并且它们有相同的

请求映射

方法

@Controller // do not have identifier here
public class UserController {
      @Autowired
      private UserService userService;
      @Autowired
      private SecurityService securityService;
      @Autowired
      private UserValidator userValidator;


     @RequestMapping(value = "/admin", method = RequestMethod.GET)
     public String admin(Model model) {
       return "admin";
     }
}


@Controller // do not have identifier here
public class ContactController {

  private ContactService contactService;

  @RequestMapping(value = {"admin", "welcome"}, 
          method = RequestMethod.GET)
  public String listContactsForAdmin(Model model) {
    model.addAttribute("contact", new Contact());
    model.addAttribute("listContacts", 
    this.contactService.listContacts());
    return "admin";
  }

}

一种可能的解决方案是为每个控制器方法设置

RequestMapping

：

   @Controller(value = "user")
   public class UserController {
   @Autowired
   private UserService userService;
   @Autowired
   private SecurityService securityService;
   @Autowired
   private UserValidator userValidator;


   @RequestMapping(value = "/admin", method = RequestMethod.GET)
   public String admin(Model model) {
      return "admin";
   }
}


@Controller(value = "contact")
public class ContactController {

private ContactService contactService;

@RequestMapping(value = {"admin", "welcome"}, method = RequestMethod.GET)
public String listContactsForAdmin(Model model) {
    model.addAttribute("contact", new Contact());
    model.addAttribute("listContacts", this.contactService.listContacts());
    return "admin";
}

}

---

您得到的消息非常清楚引发异常的原因。您有两个方法映射在同一路径上，Spring无法确定请求应该从

DispatcherServlet

转发到其中的哪一个。这两个方法都有资格处理它。@Adil为什么要接受然后取消它？@lucumt sry misclick

   @Controller(value = "user")
   public class UserController {
   @Autowired
   private UserService userService;
   @Autowired
   private SecurityService securityService;
   @Autowired
   private UserValidator userValidator;


   @RequestMapping(value = "/admin", method = RequestMethod.GET)
   public String admin(Model model) {
      return "admin";
   }
}


@Controller(value = "contact")
public class ContactController {

private ContactService contactService;

@RequestMapping(value = {"admin", "welcome"}, method = RequestMethod.GET)
public String listContactsForAdmin(Model model) {
    model.addAttribute("contact", new Contact());
    model.addAttribute("listContacts", this.contactService.listContacts());
    return "admin";
}

}