判断是否为ajax请求
if (request.getHeader("x-requested-with") != null
&& request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) {
out.print("该请求是 AJAX 异步HTTP请求。");
}else{
out.print("该请求是传统的 同步HTTP请求。");
}
if (request.getHeader("x-requested-with") != null
&& request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) {
out.print("该请求是 AJAX 异步HTTP请求。");
}else{
out.print("该请求是传统的 同步HTTP请求。");
}