有条件地设置HTTP状态而不直接操作HttpServletResponse [英] Conditionally setting the HTTP status without directly manipulating the HttpServletResponse

问题描述

如何在Spring MVC请求处理程序中方便地有条件地设置HTTP状态代码？

How can I conveniently conditionally set the HTTP status code in an Spring MVC request handler?

我有一个响应POST请求的请求处理程序，用于创建新资源。如果请求有效，我希望它重定向到新资源的URI，返回201（已创建）HTTP状态代码。如果请求无效，我希望它能让用户有机会更正提交表单中的错误，并且不应该提供201的状态代码。

I have a request handler that responds to POST requests, for creation of a new resource. If the request is valid I want it to redirect to the URI of the new resource, returning a 201 (Created) HTTP status code. If the request is invalid I want it to give the user a chance to correct the error in the submitted form, and should not give a status code of 201.

 @RequestMapping(value = { "/myURI/" }, method = RequestMethod.POST)
 public String processNewThingForm(
    @ModelAttribute(value = "name") final String name,
    final BindingResult bindingResult) {

  myValidator.validate(name, bindingResult);

  if (!bindingResult.hasErrors()) {
     getService().createThing(name);
     return "redirect:" + name;
  } else {
     return "newThingView";
  }

}

但是这并没有为重定向案例提供正确的响应状态。

But that does not give the correct response status for the redirection case.

我不能简单地添加 @ResponseStatus ，因为有两种可能的状态。我希望有一种更简洁的方式，而不是手动操作 HttpServletResponse 。我想指出要使用的视图名称，因此我无法让请求处理程序返回 ResponseEntity 状态设置正确的对象。

I can't simply add a @ResponseStatus, because there are two possible statuses. I'm hoping there is a neater way than manually manipulating the HttpServletResponse. And I want to indicate the view name to use, so I can not have the request handler return a ResponseEntity object with the status set appropriately.

推荐答案

如果您需要201响应代码，您可以返回 ResponseEntity 使用 HttpStatus.CREATED 时创建资源，否则创建视图名称。如果是这样，则无法使用重定向（http代码301）。请参阅 RedirectView 。

In case you want a 201 response code, you can return a ResponseEntity with HttpStatus.CREATED when the resource is created and the view name otherwise. If so, you cannot use a redirect (http code 301). See RedirectView.

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