验证请求是否为Ajax

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public void isAjax(ServletRequest request){
	HttpServletRequest httpRequest = (HttpServletRequest) request;
	boolean isAjaxReuest = false;
	if (httpRequest.getHeader("x-requested-with") != null 
            && "XMLHttpRequest".equalsIgnoreCase(httpRequest.getHeader("x-requested-with"))) {
		isAjaxReuest = true;
    }
}