对于有代理的nginx需要配置一下代理的header：

location / {
          proxy_pass http://127.0.0.1:8080;
        proxy_set_header    Host               $host:$server_port;
        proxy_set_header    Remote_Addr        $remote_addr;
        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_set_header    X-Nginx-Proxy      true;

}

然后在java代码中通过请求HttpServletRequest 来读取ip：

public static String getClientIpAddress(HttpServletRequest request) {// 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址String headerName = "x-forwarded-for";String ip = request.getHeader(headerName);if (null != ip && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {// 多次反向代理后会有多个IP值，第一个IP才是真实IP,它们按照英文逗号','分割if (ip.indexOf(",") != -1) {ip = ip.split(",")[0];}}if (checkIp(ip)) {headerName = "Proxy-Client-IP";ip = request.getHeader(headerName);}if (checkIp(ip)) {headerName = "WL-Proxy-Client-IP";ip = request.getHeader(headerName);}if (checkIp(ip)) {headerName = "HTTP_CLIENT_IP";ip = request.getHeader(headerName);}if (checkIp(ip)) {headerName = "HTTP_X_FORWARDED_FOR";ip = request.getHeader(headerName);}if (checkIp(ip)) {headerName = "X-Real-IP";ip = request.getHeader(headerName);}if (checkIp(ip)) {headerName = "remote addr";ip = request.getRemoteAddr();// 127.0.0.1 ipv4, 0:0:0:0:0:0:0:1 ipv6if ("127.0.0.1".equals(ip) || "0:0:0:0:0:0:0:1".equals(ip)) {//根据网卡取本机配置的IPInetAddress inet = null;try {inet = InetAddress.getLocalHost();} catch (UnknownHostException e) {e.printStackTrace();}ip = inet.getHostAddress();}}return ip;
}
private static boolean checkIp(String ip) {if (null == ip || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {return true;}return false;
}