Answer 1

从3.1版开始，制作位置的最佳方法是使用UriComponentBuilder参数并将其设置为返回的ResponseEntity。 UriComponentBuilder知道上下文并使用相对路径进行操作：

@RequestMapping(method = RequestMethod.POST)
public ResponseEntity<?> createCustomer(UriComponentsBuilder b) {

    UriComponents uriComponents = 
        b.path("/customers/{id}").buildAndExpand(id);

    HttpHeaders headers = new HttpHeaders();
    headers.setLocation(uriComponents.toUri());
    return new ResponseEntity<Void>(headers, HttpStatus.CREATED);
}

从4.1版开始，你可以缩短它

@RequestMapping(method = RequestMethod.POST)
public ResponseEntity<?> createCustomer(UriComponentsBuilder b) {

    UriComponents uriComponents = 
        b.path("/customers/{id}").buildAndExpand(id);

    return ResponseEntity.created(uriComponents.toUri()).build();
}

感谢Dieter Hubau指出这一点。

Answer 2

以下示例来自spring教程：

.event::after {
  background-image: url(https://images2.alphacoders.com/819/819763.jpg);
  background-size: cover;
  background-position: center;
}

.island::after {
  background-image: url(https://s-media-cache-ak0.pinimg.com/originals/3b/91/6b/3b916b8b33b7aa08bf8fb920be2aa536.jpg);
  background-size: cover;
  background-position: center;
}

.scorched::after {
  background-image: url(https://images4.alphacoders.com/819/819770.jpg);
  background-size: cover;
  background-position: center;
}

.card {
  overflow: hidden;
}

.serv {
  position: relative;
  z-index: 1;
}

.serv::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: -1;
  transition: transform 0.7s;
}

.serv:hover::after {
  transform: scale(1.1);
}

请注意以下内容将为您计算上下文路径（URI），以避免代码重复并使您的应用程序更具可移植性：

<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container">
  <div class="card-deck row">

    <div class="col-3">
      <!--event serv-->
      <div class="card">
        <div class="card bg-inverse">
          <div class="card-block card-inverse event serv">
            <h5>Special event</h5>
            <p class="lead">PVP / PVE</p>
            <a href="#" class="btn btn-sm btn-secondary">Infos</a>
            <a href="#" class="btn btn-sm btn-primary">Mods</a>
          </div>
        </div>
      </div>
    </div>
    <!--/event serv-->

    <div class="col-6">
      <!--island serv-->
      <div class="card">
        <div class="card bg-inverse">

          <div class="card-block card-inverse island serv">
            <h5>The island</h5>
            <p class="lead">PVE x 3</p>
            <a href="#" class="btn btn-sm btn-secondary">Infos</a>
            <a href="#" class="btn btn-sm btn-primary">Mods</a>
          </div>
        </div>
      </div>
    </div>
    <!--/island serv-->

    <div class="col-3">
      <!--scorched serv-->
      <div class="card">
        <div class="card bg-inverse">
          <div class="card-block card-inverse scorched serv">
            <h5>Scorched earth</h5>
            <p class="lead">PVE x 3</p>
            <a href="#" class="btn btn-sm btn-secondary">Infos</a>
            <a href="#" class="btn btn-sm btn-primary">Mods</a>
          </div>
        </div>
      </div>
    </div>
    <!--/scorched serv-->
  </div>
</div>

Answer 3

根据：http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.30

应使用绝对URI：

Location       = "Location" ":" absoluteURI  

URI 应该正确转义：

http://www.ietf.org/rfc/rfc2396.txt

Answer 4

这是一个老问题，但如果你想让Spring真正为你构建URI，那么你就可以做到这一点。

@RestController
@RequestMapping("/api/v1")
class JobsController {

  @PostMapping("/jobs")
  fun createJob(@RequestParam("use-gpu") useGPU: Boolean?): ResponseEntity<Unit> {

    val headers = HttpHeaders()

    val jobId = "TBD id"

    headers.location =
            MvcUriComponentsBuilder
                    .fromMethodName(JobsController::class.java, "getJob", jobId)
                    .buildAndExpand(jobId)
                    .toUri()

    return ResponseEntity(headers, HttpStatus.CREATED)
  }

  @GetMapping("/job/{jobId}")
  fun getJob(@PathVariable jobId: String) = mapOf("id" to jobId)
}

在这个例子中（用Kotlin编写但类似于java），基URI是/api/v1（在类的顶部定义）。使用MvcUriComponentsBuilder.fromMethodName调用让Spring找出正确的完整URI。 （{}}中添加了MvcUriComponentsBuilder。

Answer 5

您的方法看起来很好，但为了保持清洁，您可以将代码置于自定义HandlerInterceptor内，该代码仅在存在HTTP 201时触发。

有关详细信息，请参阅here。