java获取访问的IP

	//X-Forwarded-For：Squid 服务代理
    String ipAddresses = request.getHeader("X-Forwarded-For");

    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        //Proxy-Client-IP：apache 服务代理
        ipAddresses = request.getHeader("Proxy-Client-IP");
    }

    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        //WL-Proxy-Client-IP：weblogic 服务代理
        ipAddresses = request.getHeader("WL-Proxy-Client-IP");
    }

    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        //HTTP_CLIENT_IP：有些代理服务器
        ipAddresses = request.getHeader("HTTP_CLIENT_IP");
    }

    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        //X-Real-IP：nginx服务代理
        ipAddresses = request.getHeader("X-Real-IP");
    }

    //有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
    if (ipAddresses != null && ipAddresses.length() != 0) {
        ip = ipAddresses.split(",")[0];
    }

    //还是不能获取到，最后再通过request.getRemoteAddr();获取
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        ip = request.getRemoteAddr();
    }

    // ip配置
    if (ip.equals("127.0.0.1") || ip.endsWith("0:0:0:0:0:0:1")) {
        // 根据网卡取本机配置的IP
        return "127.0.0.1";
    }