HAL与春天Hateoas和Mvc（没有引导）

Question

我使用春天mvc和仇恨建立一个宁静的api。以前，我用仇恨的方式使用了spring boot，服务器按照我的预期提供了响应。现在，我没有使用spring引导，服务器不能正确呈现响应。从我的研究中，我发现一些人在谈论涉及消息转换器配置的解决方案。因此，除了注释@EnableHypermediaSupport，还需要在没有弹簧启动的情况下设置媒体类型HAL？

ApiConfiguration.java：

@Configuration 
@ComponentScan 
@EnableWebMvc 
@EnableHypermediaSupport(type = { HypermediaType.HAL }) 
public class ApiConfiguration { 
} 

ApiInitializer.java：

public class ApiInitializer extends AbstractAnnotationConfigDispatcherServletInitializer { 

    @Override 
    protected Class<?>[] getRootConfigClasses() { 
     return null; 
    } 

    @Override 
    protected Class<?>[] getServletConfigClasses() { 
     return new Class[] { ApiConfiguration.class }; 
    } 

    @Override 
    protected String[] getServletMappings() { 
     return new String[] { "/" }; 
    } 

}

的pom.xml：

... 
<dependencyManagement> 
    <dependencies> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-framework-bom</artifactId> 
      <version>4.2.0.RELEASE</version> 
      <type>pom</type> 
      <scope>import</scope> 
     </dependency> 
    </dependencies> 
</dependencyManagement> 

<dependencies> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-context</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-web</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-webmvc</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-core</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-test</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework.hateoas</groupId> 
     <artifactId>spring-hateoas</artifactId> 
     <version>0.19.0.RELEASE</version> 
    </dependency> 
    ... 

AdaptationRestController.java：

@RestController 
@ExposesResourceFor(Adaptation.class) 
@RequestMapping(value = "/adaptations") 
public class AdaptationRestController { 

    ... 
    @RequestMapping(value = "/{id}", method = RequestMethod.GET, produces = "application/vnd.xpto-adaptation+json") 
    public ResponseEntity<AdaptationResource> getAdaptation(@PathVariable("id") String adaptationId) { 
     Adaptation adaptation = adaptationGateway.getAdaptation(adaptationId); 
     AdaptationResource adaptationResource = adaptationResourceAssembler.toResource(adaptation); 

     return new ResponseEntity<AdaptationResource>(adaptationResource, HttpStatus.OK); 
    } 
} 

AdaptationResource.java：

public class AdaptationResource extends Resource<Adaptation> { 

    public AdaptationResource(Adaptation adaptation) { 
     super(adaptation); 
    } 

} 

我能得到什么：

"links": [ 
    { 
     "rel": "self", 
     "href": "http://xpto.com" 
    } 
], 
... 

什么应该是：

"_links": { 
    "self": {"href": "http://xpto.com"} 
}, 
... 

Answer 1

如果你使用Spring数据JPA数据访问，您可以通过添加来声明性地启用其Web支持。这将为Controller方法注册一堆ArgumentResolvers。简单地说，你可以添加PagedResourcesAssembler参数的方法和使用其toResource方法转换Page版实体资源，如：

@RequestMapping(method = GET) 
    public ResponseEntity getAll(PagedResourcesAssembler ass) { 
     Page<User> users = userRepository.findAll(new PageRequest(0, 10)); 
     PagedResources pagedResources = ass.toResource(users, assembler); 

     return ok(pagedResources); 
    } 

与此JSON输出：

{"_embedded":{...},"_links":{"self":{"href":"http://localhost:8080/users"}},"page":{...}} 

Answer 2

的选择是让你的模型扩展org.springframework.hateoas.ResourceSupport

public class MyModelClass extends ResourceSupport 

然后

@RequestMapping(value="/myresource", method=RequestMethod.GET) 
public ResponseEntity<Iterable<MyModelClass>> getAll() { 
Iterable<MyModelClass> all= repository.findAll(); 
for(MyModelClass p : all) { 
p.add(linkTo(methodOn(MyController.class).getAll()).slash(p.getId()).withSelfRel()); 
} 
return new ResponseEntity<>(all, HttpStatus.OK); 
} 

Answer 3

基本上我使用EntityLinks来建立链接，没有从任何框架相关类扩展我的Pojo。

@RestController 
@ExposesResourceFor(ProjectServiceResponse.class) 
public class ProjectController { 
    @Autowired 
    private org.springframework.hateoas.EntityLinks entityLinks; 

    public HttpEntity<Resource<ProjectServiceResponse>> get(...){ 
    Resource resource = new Resource<ProjectServiceResponse>(response); 
    resource.add(entityLinks.linkToCollectionResource(ProjectServiceResponse.class).withSelfRel()); 
    return new ResponseEntity<Resource<ProjectServiceResponse>>(resource, HttpStatus.OK); 
    } 
} 

响应：

"_links": { 
"self": { 
    "href": "http://localhost:8080/project" 
} 

在我上面的代码ProjectServiceResponse.class是POJO。

你可以参考完整的项目github