java spring獲取請求ip地址

灑家的需求是 想根據客戶端的請求獲取ip地址，然後對ip請求加次數限制，客戶端請求首先負載均衡（F5）轉發到網關（Zuul），網關接收到請求後，從註冊中心（Eureka）獲取可用服務，在服務端獲取請求的ip。

直接上方法：

public static String getIpAddress(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.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

因爲此時請求經過了幾層的轉發，所以我們不能直接用request.getRemoteAddr()來獲取。