1：request.getRemoteAddr()
2：如果请求的客户端使用了nginx 等反向代理发送请求的时候：就不能获取到真是的ip地址了：如：将http://192.168.1.110:2046/ 的URL反向代理为http://www.xxx.com/ 的URL时，用request.getRemoteAddr() 方法获取的IP地址是：127.0.0.1 或 192.168.1.110 ，而并不是客户端的真实ＩＰ。
3：解决：
public String getRemoteHost(javax.servlet.http.HttpServletRequest request){
String ip = request.getHeader(
"x-forwarded-for"
);
if
(ip ==
null
|| ip.length() ==
0
||
"unknown"
.equalsIgnoreCase(ip)){
ip = request.getHeader(
"Proxy-Client-IP"
);
}
if
(ip ==
null
|| ip.length() ==
0
||
"unknown"
.equalsIgnoreCase(ip)){
ip = request.getHeader(
"WL-Proxy-Client-IP"
);
}
if
(ip ==
null
|| ip.length() ==
0
||
"unknown"
.equalsIgnoreCase(ip)){
ip = request.getRemoteAddr();
}
return
ip.equals(
"0:0:0:0:0:0:0:1"
)?
"127.0.0.1"
:ip;
}