2014.5.5
获取客户端真实ip地址出现问题，解答如下：
When you have NAT (Network Address Translation) device before
your servlet
container request.getRemoteAddr() returns the
address of NAT , since it initiate a new connection.
To solve your problem you should configure you NAT to send in a
header the IP of the original client. Then, to take the header from
the request. In case you configure in NAT X-Forwarded-For header use
this
code: request.getHeader("X-Forwarded-For")
You function is correct, you can use it when you configure NAT.
原文：http://www.cnblogs.com/elearn007/p/3709819.html