Question

我查看了以下帖子

但我一直无法弄清楚如何解决我的问题。我正在创建一个Spring Boot Web应用程序，我在其中尝试将以下端点/quiz/score/{quizId}和/quiz/questions/{quizId}端点映射到两个单独的方法。

我的功能如下

  @RequestMapping(name="/quiz/questions/{quizId}", method=RequestMethod.GET)
  public ResponseEntity<QuizQuestion> questions(@PathVariable String quizId) {
    QuizQuestion question = this.quizService.fetchQuestion(quizId);
    if (question == null) {
      return new ResponseEntity<QuizQuestion>(HttpStatus.NOT_FOUND);
    }
    return new ResponseEntity<QuizQuestion>(question, HttpStatus.OK);
  }

和

@RequestMapping(name="/quiz/score/{id}", method=RequestMethod.GET)
  public Score getScore(@PathVariable("id") String quizId) {
    return this.quizService.getScore(quizId);
  }

我收到以下错误

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map '/myapplication' method 
public com.project.myapplication.Score com.project.myapplication.QuizController.getScore(java.lang.String)
to {[],methods=[GET]}: There is already '/myapplication' bean method
public org.springframework.http.ResponseEntity<com.project.myapplication.QuizQuestion> com.project.myapplication.QuizController.questions(java.lang.String) mapped.
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]

. . . . . . .  .. . 

Caused by: java.lang.IllegalStateException: Ambiguous mapping. Cannot map '/myapplication' method 
public com.project.myapplication.Score com.project.myapplication.QuizController.getScore(java.lang.String)
to {[],methods=[GET]}: There is already '/myapplication' bean method
public org.springframework.http.ResponseEntity<com.project.myapplication.QuizQuestion> com.project.myapplication.QuizController.questions(java.lang.String) mapped.
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.assertUniqueMethodMapping(AbstractHandlerMethodMapping.java:576) ~[spring-webmvc-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at

我知道两种方法具有相同的签名，但它们有两个唯一的端点。我该如何解决这个问题？

Answer 1

您的问题是您已经指定了这样的端点：

@RequestMapping(name="/quiz/score/{id}", method=RequestMethod.GET)
public Score getScore(@PathVariable("id") String quizId) {
    return this.quizService.getScore(quizId);
}

但他们应该是这样的：

@RequestMapping(value="/quiz/score/{id}", method=RequestMethod.GET)
public Score getScore(@PathVariable("id") String quizId) {
    return this.quizService.getScore(quizId);
}

请注意值，而不是名称。

有关进一步说明，您可以查看RequestMapping javadoc，其中说明了不同的参数。 name参数只是为您的映射命名。 value参数是关键参数。

Answer 2

使用值代替名称，也可以使用方法“特定注释”

@GetMApping("/name")
@PostMApping("/name")
@PutMApping("/name")
@DeleteMApping("/name")

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