Java获取真实的IP地址

proxy_set_header X-Real-IP          $remote_addr;
proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;
proxy_set_header Host $host:$server_port;
 proxy_set_header X-Forwarded-Proto "https";
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;

public class NetworkUtil {

    private static final String[] HEADERS_TO_TRY = { 
        "X-Forwarded-For",
        "Proxy-Client-IP", 
        "WL-Proxy-Client-IP",
        "HTTP_X_FORWARDED_FOR",
        "HTTP_X_FORWARDED",
        "HTTP_X_CLUSTER_CLIENT_IP",
        "HTTP_CLIENT_IP",
        "HTTP_FORWARDED_FOR",
        "HTTP_FORWARDED",
        "HTTP_VIA",
        "REMOTE_ADDR" 
    };


    public static String getRemoteHost(HttpServletRequest request) {
        for (String header : HEADERS_TO_TRY) {
            String ip = request.getHeader(header);
            if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
                return ip;
            }
        }
        return request.getRemoteAddr();
    }

}