java 如何判断一个请求是Ajax还是Normal？
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How to determine whether a request is Ajax or Normal?
提问by Amol Ghotankar
I want to handle errors differently for AJAX requests vs normal requests.
我想以不同的方式处理 AJAX 请求和普通请求的错误。
How do I identify whether a request is AJAX or not in Struts2 actions ?
如何在 Struts2 操作中识别请求是否为 AJAX？
回答by Andrea Ligios
You should check if the Request Header X-Requested-Withis present and equals to XMLHttpRequest.
您应该检查请求标头X-Requested-With是否存在并且等于XMLHttpRequest。
Note that not all the AJAX requests have this header, for example Struts2 Dojorequests don't send it; if you instead are generating AJAX calls with Struts2-jQuery(or with any other new AJAX framework), it is there.
请注意，并非所有 AJAX 请求都有此标头，例如Struts2 Dojo请求不会发送它；如果您使用Struts2-jQuery（或任何其他新的 AJAX 框架）生成 AJAX 调用，它就在那里。
You can check if it's present by using Firebug's Net module... for example, when you vote on Stack Overflow ;)
您可以使用Firebug's Net module...检查它是否存在，例如，当您对 Stack Overflow 进行投票时；)
To check it from within a Struts2 Action, you need to implement the ServletRequestAwareinterface, then get the Requestand check if that particular header is there like this:
要从 a 中检查它Struts2 Action，您需要实现该ServletRequestAware接口，然后获取Request并检查该特定标头是否存在，如下所示：
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;
}
}
Note that you can obtain the request via ActionContext too, without implementing the ServletRequestAware interface, but it is not the recommended way:
请注意，您也可以通过 ActionContext 获取请求，而无需实现 ServletRequestAware 接口，但这不是推荐的方式：
HttpServletRequest request = ServletActionContext.getRequest();
回答by user497087
The other alternative, which I use is to add the parameter ajax=true to all Ajax url strings and test in my action with an isAjax() method.
我使用的另一种替代方法是将参数 ajax=true 添加到所有 Ajax url 字符串，并使用 isAjax() 方法在我的操作中进行测试。
