nginx后的tomcat获取真实用户ip

目前大部分获取ip的方式：beat.getRequest().getRemoteAddr()
但是，如果通过nginx反向代理的话，就获取不到真实ip，是获取的nginx的ip

需要：添加    proxy_set_header  X-Real-IP  $remote_addr;

   server {
        listen       80;
        server_name  price.kuche.com;
        location / {
            root   html;
          proxy_set_header  X-Real-IP  $remote_addr;
            proxy_pass http:backServers;
         }
   }

添加一个表头声明

然后这样取

    public static String getRemoteAddrIp(HttpServletRequest request) {
        String ipFromNginx = getHeader(request, "X-Real-IP");
        System.out.println("ipFromNginx:" + ipFromNginx);
        System.out.println("getRemoteAddr:" + request.getRemoteAddr());
        return StringUtil.isEmpty(ipFromNginx) ? request.getRemoteAddr() : ipFromNginx;
    }

    private static String getHeader(HttpServletRequest request, String headName) {
        String value = request.getHeader(headName);
        return !StringUtils.isBlank(value) && !"unknown".equalsIgnoreCase(value) ? value : "";
    }