解决java获取访问用户的ip都是127.0.0.1

Posted 2021-09-13 阿昌喜欢吃黄桃

通过java代码去获取用户的访问ip，发现不管怎么获取都是127.0.0.1的ip

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Java代码

/**
 * 阿昌
 */
public class IpAddressUtil {
    /**
     * 获取Ip地址
     * @param request
     * @return
     */
    public static String getIpAddress(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0
                    || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0
                    || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0
                    || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (ipAddress.equals("127.0.0.1")) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress = "";
        }
        // ipAddress = this.getRequest().getRemoteAddr();

        return ipAddress;
    }
}

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突然想到项目是通过nginx做转发，如果nginx转发请求后未携带请求头，那就都是本地的127.0.0.1

#添加如下配置，让nginx转发时，携带请求头信息
proxy_set_header x-forwarded-for  $remote_addr;

加入以上代码后，重新加载nginx配置文件，重新登录应该就可以了。

./sbin/nginx -s reoload #重启nginx

再次查看解决问题！！！

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