用Nginx反向代理后，原先的HttpServletRequest获取到的ip地址变成了反向代理服务器的地址。
要获取客户端的真实ip，修改nginx.conf文件，在location配置中加入如下代码：
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
重新加载nginx配置文件
nginx -s reload
修改Java代码
// 客户端ip地址
//String ip = request.getRemoteAddr();
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.getHeader("HTTP_CLIENT_IP");
}
if (ip ==null || ip.length() ==0 ||"unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("HTTP_X_FORWARDED_FOR");
}
if (ip ==null || ip.length() ==0 ||"unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
