Question

我正在尝试通过servlet获取客户端public ip地址，如下所示：

        String ip = request.getHeader("X-Forwarded-For");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        System.out.println("1. ip: "+ip);
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        System.out.println("2. ip: "+ip);
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        System.out.println("3. ip: "+ip);
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        System.out.println("4. ip: "+ip);
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        System.out.println("4. ip: "+ip);

但是这只能返回localhost IP，如下面的输出所示：

1. ip: null
2. ip: null
3. ip: null
4. ip: null
4. ip: 127.0.0.1

任何帮助？

Answer 1

它取决于代理服务器/负载均衡器及其配置。在大多数情况下，可以通过

获得IP

request.getHeader("x-forwarded-for")

或

request.getHeader("x-real-ip")

如果您的服务器之前有代理服务器，请确保代理服务器将标头传递给您的服务器，例如：在nginx的情况下，它应该看起来像

server {
  server_name  domain.com;
  ...
  location /path-to-server {
    ...
    proxy_pass  localhost:8080;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    ...
  }

Answer 2

我喜欢这个，你可以尝试一下

public String getIpAddr(HttpServletRequest request) {      
   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.getRemoteAddr();      
   }      
   return ip;      
}

Servlet - 获取客户端公共IP

2 个答案: