ajax的请求和普通的http请求，在header里面多了个参数X-Requested-With
所以可以根据这个来区分。
X-Requested-With请求头用于在服务器端判断request来自Ajax请求还是传统请求。
两种请求在请求的Header不同，Ajax 异步请求比传统的同步请求多了一个头参数
1 传统同步请求参数
accept text/html,application/xhtml+xml,application/xml;q=0.9,**
accept-language zh-cn
referer xxx
x-requested-with XMLHttpRequest
content-type application/x-www-form-urlencoded,text/javascript
accept-encoding gzip, deflate
user-agent Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; QQDownload 598
host 192.168.101.72:8080
content-length 233
connection Keep-Alive
cache-control no-cache
cookie CSS=undefined; JSESSIONID=1B9AC25036290F7FB6823CCE1A24E541
可看到Ajax请求多了个x-requested-with，可以获取request.getHeader("X-Requested-With")
bool isAjax = null;
String header = request.getHeader("X-Requested-With");
if(null != header && header.equals("XMLHttpRequest"))
{
isAjax = true;
}
可以看到header为null则为传统同步请求。若为XMLHttpRequest则为Ajax请求。
refurl:http://woshixy.blog.51cto.com/5637578/976695
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