获取请求的ip地址

如果使用了nginx代理后台，则需要在nginx代理中将用户ip添加在请求头中

location /api {
  proxy_set_header Host $http_host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header REMOTE-HOST $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_pass http://localhost:8080/;
}

后台代码如下：

package top.ygang.huijifindresource.utils;

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;
import org.springframework.web.client.RestTemplate;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Map;

/**
 * @Description: IP工具类
 * @Author: yanggang
 * @Date: 
 */
public class IpUtil {

    /**
     * 获取请求IP
     * @param request
     * @return
     */
    public static String getIpByRequest(HttpServletRequest request) {
        if (request == null) {
            return "unknown";
        }
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                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");
            }
            // X-Real-IP 需要在Nginx proxy中配置
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("X-Real-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 = "";
        }
        return ipAddress;
    }

    /**
     * 获取ip的真实地址
     * @param ip
     * @return
     */
    public static String getAddressByIp(String ip){
        String url = "http://whois.pconline.com.cn/ipJson.jsp?ip=" + ip + "&json=true";
        RestTemplate restTemplate = new RestTemplate();
        try {
            String resp = restTemplate.getForObject(url,String.class);
            JSONObject jsonObject = JSON.parseObject(resp);
            return jsonObject.getString("addr");
        }catch (Exception e){
            e.printStackTrace();
            return "xx_xx";
        }
    }
}