工具集-Java获取客户端的 IP

废话不多说，直接上代码，这里主要是写一下主要方法：

public static String getIP(HttpServletRequest request) {

        String ip = request.getHeader("X-Real-IP");

        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("x-forwarded-for");
        } else {
            return ip;
        }

        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        } else {
            // 当有多级反向代理时，x-forwarded-for值为多个时取第一个ip地址
            if (ip.indexOf(IP_SEPARATOR) != -1) {
                ip = ip.substring(0, ip.indexOf(IP_SEPARATOR));
            }
            return ip;
        }

        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        } else {
            return ip;
        }

        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        } else {
            return ip;
        }

        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = "";
        }
        return ip;
    }