兩種請求在請求的Header不同，Ajax 異步請求比傳統的同步請求多了一個頭參數
1 傳統同步請求參數
accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
accept-charset gb2312,utf-8;q=0.7,*;q=0.7
accept-encoding gzip,deflate
accept-language zh-cn,zh;q=0.5
cache-control max-age=0
connection keep-alive
cookie JSESSIONID=1A3BED3F593EA9747C9FDA16D309AF6B
host 192.168.101.72:8080
keep-alive 300
referer XXX
user-agent Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.0.15) Gecko/2009101601 Firefox/3.0.15 (.NET CLR 3.5.30729)
2 Ajax 異步請求方式
accept */*
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; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET
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請求多了個x-requested-with，可以獲取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爲null則爲傳統同步請求。若爲XMLHttpRequest則爲Ajax請求。
原帖地址:http://www.cnblogs.com/tony-jingzhou/archive/2012/07/30/2615612.html
