如何判断一个请求是阿贾克斯还是正常的吗？ [英] How to determine whether a request is Ajax or Normal?

问题描述

我要以不同方式处理错误的AJAX请求与正常的请求。

I want to handle errors differently for AJAX requests vs normal requests.

我如何确定一个请求是否为AJAX或者不Struts2的行动？

How do I identify whether a request is AJAX or not in Struts2 actions ?

推荐答案

您应该检查是否请求头 X-要求 - 以是present和等于 XMLHtt prequest 。

You should check if the Request Header X-Requested-With is present and equals to XMLHttpRequest.

请注意，并非所有的AJAX请求有这个头，例如 Struts2的道场请求不发送;如果与 Struts2的-的jQuery （或任何其他新的AJAX框架），而不是你正在生成AJAX调用，它的存在。

Note that not all the AJAX requests have this header, for example Struts2 Dojo requests doesn't send it; if you instead are generating AJAX calls with Struts2-jQuery (or with any other new AJAX framework), it is there.

您可以检查是否是present使用 Firebug的网络模块 ...例如，当你投对堆栈溢出;）

You can check if it's present by using Firebug's Net module... for example, when you vote on Stack Overflow ;)

从内部检查一个 Struts2的行动，你需要实现 ServletRequestAware 界面，再拿到要求，并检查特定的头有没有这样的：

To check it from within a Struts2 Action, you need to implement the ServletRequestAware interface, then get the Request and check if that particular header is there like this:

public class MyAction extends ActionSupport implements ServletRequestAware {
   private HttpServletRequest request;

   public void setRequest(HttpServletRequest request) {
      this.request = request;
   }

   public HttpServletRequest getRequest() {
      return this.request;
   }

   public String execute() throws Exception{
      boolean ajax = "XMLHttpRequest".equals(
                      getRequest().getHeader("X-Requested-With"));
      if (ajax)
         log.debug("This is an AJAX request");
      else 
         log.debug("This is an ordinary request");

      return SUCCESS;
   }  
}

请注意，您可以通过获得的ActionContext中也要求，没有实现ServletRequestAware接口，但它是不推荐的方式：

Note that you can obtain the request via ActionContext too, without implementing the ServletRequestAware interface, but it is not the recommended way:

HttpServletRequest request = ServletActionContext.getRequest();

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