server {

    listen       ;

    server_name  www.wenki.info;    #要访问的域名

    charset utf8;

    location / {

        proxy_pass       http://server;

        proxy_set_header Host      $host;

        proxy_set_header X-Real-IP $remote_addr;

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    }

}

nginx -s reload

public static String realIP(HttpServletRequest request) {

    String xff = request.getHeader("x-forwarded-for");

    if (xff != null) {

        int index = xff.indexOf(',');

        if (index != -1) {

            xff = xff.substring(0, index);

        }

        return xff.trim();

    }

    return request.getRemoteAddr();

}