所以我浏览了一些关于使用 spring hateoas(带 spring-boot)的文档和示例。因此,通过以下示例,我创建了 2 个 Controller 。
这是第一个片段:
@RestController
@RequestMapping(value = "/users", produces = MediaType.APPLICATION_JSON_VALUE)
public class UserController {
@Autowired
private UserService userService;
@RequestMapping(method = RequestMethod.GET)
public HttpEntity<Resources<Resource<UserResponse>>> findAll() {
List<UserResponse> userList = userService.finaAll();
List<Resource<UserResponse>> resources = Lists.newArrayList();
for (UserResponse user : userList) {
Resource<UserResponse> userResource = new Resource<UserResponse>(user);
resources.add(userResource);
userResource.add(linkTo(methodOn(UserController.class).findAll()).withSelfRel());
userResource.add(linkTo(methodOn(UserController.class).findById(user.getId())).withRel("viewUser"));
}
return new ResponseEntity(new Resources(resources), HttpStatus.OK);
}
}
这是 UserResponse DTO:
public class UserResponse {
private Long id;
private String firstName;
private String lastName;
private String socialNumber;
@JsonDeserialize(using = LocalDateDeserializer.class)
@JsonSerialize(using = LocalDateSerializer.class)
@DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
private LocalDate dateOfBirth;
}
为简洁起见,删除了 getter 和 setter,唯一值得一提的是 ID 属性的 getter/setter 上有 @JsonIgnore 和 @JsonProperty。
现在我得到的响应如下:
{
"_embedded" : {
"userResponses" : [ {
"firstName" : "Brand",
"lastName" : "White",
"socialNumber" : "342asd3423",
"dateOfBirth" : "1987-04-04",
"_links" : {
"self" : {
"href" : "http://localhost:8080/users"
},
"viewUser" : {
"href" : "http://localhost:8080/users/10"
}
}
}, {
"firstName" : "Snow",
"lastName" : "Green",
"socialNumber" : "3423cxvx423",
"dateOfBirth" : "1987-01-12",
"_links" : {
"self" : {
"href" : "http://localhost:8080/users"
},
"viewUser" : {
"href" : "http://localhost:8080/users/11"
}
}
} ]
}
}
问题一:根据http://docs.spring.io/spring-hateoas/docs/current/reference/html/格式应该是这样的:
links : [ { rel : "self", href : "http://myhost/people" } ] } in my example it looks like like "rel" is an attribute.
我有第二个 Controller ,基本上是复制粘贴的:
@RestController
@RequestMapping(value = "/users/{userId}/details", produces = MediaType.APPLICATION_JSON_VALUE)
public class DetailsController {
//... services ...
@RequestMapping(method = RequestMethod.GET)
public HttpEntity<Resources<Resource<DetailsResponse>>> findAllUserDetails(@PathVariable("userId") Long userId) {
Iterable<UserDetails> details = userDetails.findAll();
List<Resource<DetailsResponse>> hyperList = Lists.newArrayList();
for (UserDetails detail : details) {
Resource<DetailsResponse> hyperRes = new Resource<DetailsResponse>(new DetailsResponse(details));
hyperRes.add(linkTo(DetailsController.class, userId).withSelfRel());
hyperRes.add(linkTo(DetailsController.class, userId).slash("/" + detail.getId()).withRel("viewDetail"));
hyperRes.add(linkTo(DetailsController.class, userId).slash("/" + detail.getId()).withRel("updateDetail"));
hyperList.add(hyperRes);
}
return new ResponseEntity(hyperList, HttpStatus.OK);
}
}
这个单一的方法产生这样的响应:
{
"lifespanDays": 60,
"status": "deceased",
"dateBorn": [
2015,
4,
5
],
"dateDied": [
2015,
6,
4
],
"links": [
{
"rel": "self",
"href": "http://localhost:8080/users/10/details"
},
{
"rel": "viewDetail",
"href": "http://localhost:8080/users/10/details/30"
},
{
"rel": "updateDetail",
"href": "http://localhost:8080/users/10/details/30"
}
]
}
第二个 Controller 的 DTO:
public class UserDetailResponse {
private Long lifespanDays;
private String status;
@JsonDeserialize(using = LocalDateDeserializer.class)
@JsonSerialize(using = LocalDateSerializer.class)
@DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
private LocalDate dateBorn;
@JsonDeserialize(using = LocalDateDeserializer.class)
@JsonSerialize(using = LocalDateSerializer.class)
@DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
private LocalDate dateDied;
}
我不明白哪种格式适合 JSON?而且我也不明白为什么它们会有所不同,尽管在类型上指定的 produces MediaType 都是 application/json 。此外,UserDetail 响应中的日期格式也已更改....
两个 Controller 都在同一个包下,都有相同的注释。这是开箱即用的 Spring-Boot,带有一堆 stater 依赖项:
compile('org.springframework.boot:spring-boot-starter-web:1.2.2.RELEASE')
compile('org.springframework.hateoas:spring-hateoas:0.17.0.RELEASE')
compile('org.springframework.boot:spring-boot-starter-data-rest:1.2.2.RELEASE') { transitive = true; }
compile('com.google.code.gson:gson:2.3.1');
compile('org.springframework.boot:spring-boot-starter-data-jpa:1.2.2.RELEASE') { transitive = true; };
compile('com.google.guava:guava:18.0')
compile('commons-beanutils:commons-beanutils:1.9.2')
runtime('org.hsqldb:hsqldb:2.3.2');
最佳答案
问题一:
Spring Boot 中默认的响应格式是 HAL ,这就是你得到的。链接的序列化确实与您预期的不同。 Spring HATEOAS 为负责此操作的 Jackson
注册了一个模块。顺便说一句:文档没有明确说明链接的呈现。
问题二:
由 OP 在评论中回答。
FWIW:两个响应都是正确的 JSON。
关于json - Spring Boot - RESTful Controller 、hateoas 和 JSON,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29459625/