经过NGINX反向代理，后端服务器获取不了真实IP

原因：通过了Apache，Squid，nginx等反向代理软件就不能获取到客户端的真实IP地址了。经过代理以后，由于在客户端和服务之间增加了中间层，因此服务器无法直接拿到客户端的IP(拿到的是中间层的ip)，服务器端应用也无法直接通过转发请求的地址返回给客户端。但是在转发请求的HTTP头信息中，增加了x-forwarded-for信息。用以跟踪原有的客户端IP地址和原来客户端请求的服务器地址。

解决：在NGINX反向代理服务器上进行修改

在nginx配置文件中

每一个location上加上以下

proxy_set_header Host $http_host;
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;

重启nginx即可

springboot获取ip

/**
 * 获取登录用户的IP地址
 *
 * @param request
 * @return
 */

public static String getIp(HttpServletRequest request) {
    if (request == null)
        return "";
    String ip = request.getHeader("X-Requested-For");
    if (Strings.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("X-Forwarded-For");
    }
    if (Strings.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("Proxy-Client-IP");
    }
    if (Strings.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if (Strings.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_CLIENT_IP");
    }
    if (Strings.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_X_FORWARDED_FOR");
    }
    if (Strings.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddr();
    }

    if("0:0:0:0:0:0:0:1".equals(ip)){
        return "127.0.0.1";
    }
    return ip;
}

public static boolean isLocalHost(String ip){
    return "127.0.0.1".equals(ip) || "localhost".equals(ip);
}
/**
 * 解析ip地址
 *
 * @param ipAddress
 * @return
 */
public static String getIpSource(String ipAddress) {
    try {
        URL url = new URL("http://opendata.baidu.com/api.php?query=" + ipAddress + "&co=&resource_id=6006&oe=utf8");
        BufferedReader reader = new BufferedReader(new InputStreamReader(url.openConnection().getInputStream(), "utf-8"));
        String line = null;
        StringBuffer result = new StringBuffer();
        while ((line = reader.readLine()) != null) {
            result.append(line);
        }
        reader.close();
        Map map = JSON.parseObject(result.toString(), Map.class);
        List<Map<String, String>> data = (List) map.get("data");
        return data.get(0).get("location");
    } catch (Exception e) {
        return "";
    }
}