Spring Boot 找不到 URL答案

【问题标题】：Spring Boot won't find URLSpring Boot 找不到 URL
【发布时间】：2017-10-11 02:46:16
【问题描述】：

我正在尝试在 Integrating Angular 2 with Spring Boot, JWT and CORS, Part 1 上运行教程。我有一个在我的 STS（Spring Tool Suite）环境中编译的项目，但它不会与网站推荐的 http://localhost:8080/heroes 链接对话。

我试图不改变作者写的任何东西，但我做了这些方式：

对于 data.sql，我预先添加了一个 CREATE TABLE 语句。这使得 H2 数据库填充成功。
我把RepositoryConfig.java和HeroRepository.java放到了英雄包里。该网站似乎推荐了 com.examples 包。

当我执行 STS“Run As”、“Spring Boot App”命令时，我会从 Spring Boot 输出中获得这些映射：

2017-05-11 17:11:21.132  INFO 9784 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6ce139a4: startup date [Thu May 11 17:11:16 CDT 2017]; root of context hierarchy
2017-05-11 17:11:21.235  INFO 9784 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-05-11 17:11:21.236  INFO 9784 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-05-11 17:11:21.279  INFO 9784 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-05-11 17:11:21.280  INFO 9784 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-05-11 17:11:21.312  INFO 9784 --- [           main] .m.m.a.ExceptionHandlerExceptionResolver : Detected @ExceptionHandler methods in repositoryRestExceptionHandler
2017-05-11 17:11:21.423  INFO 9784 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-05-11 17:11:21.644  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerAdapter   : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6ce139a4: startup date [Thu May 11 17:11:16 CDT 2017]; root of context hierarchy
2017-05-11 17:11:21.655  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[PUT],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<? extends org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryEntityController.putItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.PersistentEntityResource,java.io.Serializable,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,org.springframework.data.rest.webmvc.support.ETag,java.lang.String) throws org.springframework.web.HttpRequestMethodNotSupportedException
2017-05-11 17:11:21.655  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.Resource<?>> org.springframework.data.rest.webmvc.RepositoryEntityController.getItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,org.springframework.http.HttpHeaders) throws org.springframework.web.HttpRequestMethodNotSupportedException
2017-05-11 17:11:21.656  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.optionsForItemResource(org.springframework.data.rest.webmvc.RootResourceInformation)
2017-05-11 17:11:21.656  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[PATCH],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryEntityController.patchItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.PersistentEntityResource,java.io.Serializable,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,org.springframework.data.rest.webmvc.support.ETag,java.lang.String) throws org.springframework.web.HttpRequestMethodNotSupportedException,org.springframework.data.rest.webmvc.ResourceNotFoundException
2017-05-11 17:11:21.656  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[DELETE],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.deleteItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,org.springframework.data.rest.webmvc.support.ETag) throws org.springframework.data.rest.webmvc.ResourceNotFoundException,org.springframework.web.HttpRequestMethodNotSupportedException
2017-05-11 17:11:21.657  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.hateoas.Resources<?> org.springframework.data.rest.webmvc.RepositoryEntityController.getCollectionResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.support.DefaultedPageable,org.springframework.data.domain.Sort,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws org.springframework.data.rest.webmvc.ResourceNotFoundException,org.springframework.web.HttpRequestMethodNotSupportedException
2017-05-11 17:11:21.657  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[GET],produces=[application/x-spring-data-compact+json || text/uri-list]}" onto public org.springframework.hateoas.Resources<?> org.springframework.data.rest.webmvc.RepositoryEntityController.getCollectionResourceCompact(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.support.DefaultedPageable,org.springframework.data.domain.Sort,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws org.springframework.data.rest.webmvc.ResourceNotFoundException,org.springframework.web.HttpRequestMethodNotSupportedException
2017-05-11 17:11:21.657  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[POST],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryEntityController.postCollectionResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.PersistentEntityResource,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,java.lang.String) throws org.springframework.web.HttpRequestMethodNotSupportedException
2017-05-11 17:11:21.657  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.headForItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws org.springframework.web.HttpRequestMethodNotSupportedException
2017-05-11 17:11:21.658  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.optionsForCollectionResource(org.springframework.data.rest.webmvc.RootResourceInformation)
2017-05-11 17:11:21.658  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.headCollectionResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.support.DefaultedPageable) throws org.springframework.web.HttpRequestMethodNotSupportedException
2017-05-11 17:11:21.662  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.followPropertyReference(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws java.lang.Exception
2017-05-11 17:11:21.663  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}/{propertyId}],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.followPropertyReference(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String,java.lang.String,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws java.lang.Exception
2017-05-11 17:11:21.663  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}],methods=[DELETE],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<? extends org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.deletePropertyReference(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String) throws java.lang.Exception
2017-05-11 17:11:21.663  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}],methods=[PATCH || PUT || POST],consumes=[application/json || application/x-spring-data-compact+json || text/uri-list],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<? extends org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.createPropertyReference(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.http.HttpMethod,org.springframework.hateoas.Resources<java.lang.Object>,java.io.Serializable,java.lang.String) throws java.lang.Exception
2017-05-11 17:11:21.664  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}],methods=[GET],produces=[application/x-spring-data-compact+json || text/uri-list]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.followPropertyReferenceCompact(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws java.lang.Exception
2017-05-11 17:11:21.664  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}/{propertyId}],methods=[DELETE],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.deletePropertyReferenceId(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String,java.lang.String) throws java.lang.Exception
2017-05-11 17:11:21.666  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search/{search}],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<java.lang.Object> org.springframework.data.rest.webmvc.RepositorySearchController.optionsForSearch(org.springframework.data.rest.webmvc.RootResourceInformation,java.lang.String)
2017-05-11 17:11:21.666  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search/{search}],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<java.lang.Object> org.springframework.data.rest.webmvc.RepositorySearchController.headForSearch(org.springframework.data.rest.webmvc.RootResourceInformation,java.lang.String)
2017-05-11 17:11:21.667  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.data.rest.webmvc.RepositorySearchesResource org.springframework.data.rest.webmvc.RepositorySearchController.listSearches(org.springframework.data.rest.webmvc.RootResourceInformation)
2017-05-11 17:11:21.669  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search/{search}],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositorySearchController.executeSearch(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.util.MultiValueMap<java.lang.String, java.lang.Object>,java.lang.String,org.springframework.data.rest.webmvc.support.DefaultedPageable,org.springframework.data.domain.Sort,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,org.springframework.http.HttpHeaders)
2017-05-11 17:11:21.670  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.RepositorySearchController.headForSearches(org.springframework.data.rest.webmvc.RootResourceInformation)
2017-05-11 17:11:21.672  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search/{search}],methods=[GET],produces=[application/x-spring-data-compact+json]}" onto public org.springframework.hateoas.ResourceSupport org.springframework.data.rest.webmvc.RepositorySearchController.executeSearchCompact(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.http.HttpHeaders,org.springframework.util.MultiValueMap<java.lang.String, java.lang.Object>,java.lang.String,java.lang.String,org.springframework.data.rest.webmvc.support.DefaultedPageable,org.springframework.data.domain.Sort,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler)
2017-05-11 17:11:21.672  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.RepositorySearchController.optionsForSearches(org.springframework.data.rest.webmvc.RootResourceInformation)
2017-05-11 17:11:21.673  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/ || ],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.http.HttpEntity<org.springframework.data.rest.webmvc.RepositoryLinksResource> org.springframework.data.rest.webmvc.RepositoryController.listRepositories()
2017-05-11 17:11:21.673  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/ || ],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryController.headForRepositories()
2017-05-11 17:11:21.674  INFO 9784 --- [           main] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/ || ],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.RepositoryController.optionsForRepositories()
2017-05-11 17:11:21.676  INFO 9784 --- [           main] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile/{repository}],methods=[GET],produces=[application/alps+json || */*]}" onto org.springframework.http.HttpEntity<org.springframework.data.rest.webmvc.RootResourceInformation> org.springframework.data.rest.webmvc.alps.AlpsController.descriptor(org.springframework.data.rest.webmvc.RootResourceInformation)
2017-05-11 17:11:21.676  INFO 9784 --- [           main] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile/{repository}],methods=[OPTIONS],produces=[application/alps+json]}" onto org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.alps.AlpsController.alpsOptions()
2017-05-11 17:11:21.679  INFO 9784 --- [           main] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile],methods=[OPTIONS]}" onto public org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.ProfileController.profileOptions()
2017-05-11 17:11:21.680  INFO 9784 --- [           main] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile],methods=[GET]}" onto org.springframework.http.HttpEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.ProfileController.listAllFormsOfMetadata()
2017-05-11 17:11:21.681  INFO 9784 --- [           main] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile/{repository}],methods=[GET],produces=[application/schema+json]}" onto public org.springframework.http.HttpEntity<org.springframework.data.rest.webmvc.json.JsonSchema> org.springframework.data.rest.webmvc.RepositorySchemaController.schema(org.springframework.data.rest.webmvc.RootResourceInformation)
2017-05-11 17:11:21.943  INFO 9784 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-05-11 17:11:22.058  INFO 9784 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)

如果我选择http://localhost:8080 或http://localhost:8080/profile，我会得到一个看起来像 HATEOAS 响应的东西。但是尝试http://localhost:8080/heroes 会返回 404 响应。

到目前为止，程序只有四个 Java 文件：Hero、HeroRepository、RepositoryConfig 和 BackEndApplication。这里是 HeroRepository 的开始：

@RepositoryRestResource(collectionResourceRel = "heroes", path = "heroes")
public interface HeroRepository extends CrudRepository<Hero, Long> {

我正在尝试制作的教程网站似乎缺少重要的一点。我错过了什么？

谢谢，杰罗姆。

【问题讨论】：

当您从浏览器访问localhost:8080 时，它应该在响应中为您提供localhost:8080/heroes。你看到了吗？
请看下面我的回答。我找到了一个 stackoverflow 答案，它告诉我问题以及如何解决。

标签： java spring-boot

【解决方案1】：

我四处寻找帮助，并在 StackOverflow 上找到了它：Spring Boot: Cannot access REST controller on localhost (404)

教程代码的问题在于，@SpringBootApplication 的类是一个“较低”的包——至少是不同的——而不是承载 REST 类的代码。在教程中，这意味着 heros.backend.BackEndApplication 不会让程序找到 heros.HeroRepository。

我将课程设置为 heros.BackEndApplication 并取得了成功：

{
  "_links" : {
    "self" : {
      "href" : "http://localhost:8080/profile"
    },
    "heroes" : {
      "href" : "http://localhost:8080/profile/heroes"
    }
  }
}

感谢收听，pvpkiran，感谢您的回复。

杰罗姆。

【讨论】：