nginx做反向负载均衡后端服务器获取真实客户端IP

Nginx代理站点配置

nginx会在把请求转向后台real-server前把http报头中的ip地址进行替换；这样操作完成后，real-server也需要做一些操作；

upstream serverName {        server  127.0.0.1:8080  weight=1;        }server {    listen       80;    server_name  www.domain.com w-search.domain.com.cn w-member.domain.com.cn;    location / {        proxy_redirect off;        proxy_set_header Host $host;        proxy_set_header X-Real-IP $remote_addr;        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;        proxy_set_header X-Forwarded-Proto  $scheme;        proxy_connect_timeout 5;        proxy_send_timeout 30;        proxy_read_timeout 10;        proxy_pass http://serverName;    }    #FESCO官网 静态站点配置    location /webfile/ {        alias   /data/www/web.domain.com/domain/web/site_1/;        index  index.html;    }}

服务端JAVA代码

public class ClientIPUtils { /**  * 在很多应用下都可能有需要将用户的真实IP记录下来，这时就要获得用户的真实IP地址，在JSP里，获取客户端的IP地  * 址的方法是：request.getRemoteAddr()，这种方法在大部分情况下都是有效的。但是在通过了Apache,nginx等  * 反向代理软件就不能获取到客户端的真实IP地址了。  * 但是在转发请求的HTTP头信息中，增加了X－FORWARDED－FOR信息。用以跟踪原有的客户端IP地址和原来客户端请求的服务器地址。  * @param request  * @return  */public static String getClientIp(HttpServletRequest request) {           String ip = request.getHeader("x-forwarded-for");　　　  //String ip = request.getHeader("X-real-ip");            logger.debug("x-forwarded-for = {}", ip);           if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {               ip = request.getHeader("Proxy-Client-IP");                logger.debug("Proxy-Client-IP = {}", ip);            }           if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {               ip = request.getHeader("WL-Proxy-Client-IP");               logger.debug("WL-Proxy-Client-IP = {}", ip);           }           if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {               ip = request.getRemoteAddr();               logger.debug("RemoteAddr-IP = {}", ip);            }           if(StringUtils.isNotBlank(ip)) {               ip = ip.split(",")[0];           }           return ip;       }}