java - 如何在spring mvc中设置响应头

Question

我有一种方法，我想在其中设置响应标头缓存控制和编译指示：-

public String addUser(@Valid User user, BindingResult bindingResult)
{
    if(bindingResult.hasErrors())
    {
        bindingResult.getFieldError();
        return"edit";
    }
    return "redirect:/welcome/profile/"+user.getName();
}

在这种方法中，我想设置缓存控制和编译指示，就像我们在简单的 servlet 代码中使用 HttpservletResponse 调用 setHeader 方法一样：-

response.setHeader("Cache-Control","no-cache,no-store,must-revalidate");
    response.setHeader("Pragma","no-cache");
    response.setDateHeader("Expires", 0);

我搜索了 spring 文档，找不到任何直接的方法，但我发现了这个：-

@RequestMapping("/something")
public ResponseEntity<String> handle(HttpEntity<byte[]> requestEntity) throws UnsupportedEncodingException 
{
    String requestHeader = requestEntity.getHeaders().getFirst("MyRequestHeader"));
    byte[] requestBody = requestEntity.getBody();
    HttpHeaders responseHeaders = new HttpHeaders();
    responseHeaders.set("MyResponseHeader", "MyValue");
    return new ResponseEntity<String>("Hello World", responseHeaders, HttpStatus.CREATED);
}

但我不知道如何使用它

Answer 1

如果要为控制器的每个响应设置标头，可以使用@ModelAttribute注释。

@ModelAttribute
public void setVaryResponseHeader(HttpServletResponse response) {
    response.setHeader("Vary", "Accept");
}    

Answer 2

  public String addUser(@Valid User user, BindingResult bindingResult,HttpServletRequest request,HttpServletResponse response)
  {
       if(bindingResult.hasErrors())
       {
            bindingResult.getFieldError();
            return"edit";
      }
      response.setHeader("Cache-Control","no-cache,no-store,must-revalidate");
      response.setHeader("Pragma","no-cache");
      response.setDateHeader("Expires", 0);
      return "redirect:/welcome/profile/"+user.getName();
  }

Answer 3

自 Spring v. 4.1 以来：

@RequestMapping("/something")
public ResponseEntity<MyClass> handle()
{
return ResponseEntity.status(HttpStatus.CREATED)
              .header("header", "value")
              .body(new MyClass());
}

Answer 4

您可以手动设置标题，如下所示。

进口：

import org.springframework.http.HttpHeaders;

代码：

public ResponseEntity<Map<String, Object>> doSomething() {
   ...
HttpHeaders respHeaders = new HttpHeaders();
respHeaders.add("Pragma", "no-cache");
respHeaders.add("Cache-Control","no-cache,no-store,must-revalidate");
return new ResponseEntity<Map<String, Object>>(respHeaders, HttpStatus.OK);
}