Java获取IP及归属地

快来打我* 2024-03-31 15:13 39阅读 0赞

最近我们发现各大社交平台都出现了一个新的功能：IP属地。

比如某乎：

## ![734f4cfce6eb4040aaeece6e483cb765.png][] ##

这个IP属地是怎么做到的呢？今天我来教教你，保证你看完直呼Easy~

## 技术栈 ##

1.Java网络编程

2.Servlet

## 具体实现 ##

## 1.获取IP地址及其归属地工具类 ##

package com.mmg.controller;
    
    import javax.servlet.http.HttpServletRequest;
    import java.io.BufferedReader;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.net.HttpURLConnection;
    import java.net.URL;
    
    /**
     * 获取IP地址工具类
     */
    public class Iputil {
    
        /**
         * 1.通过request对象获取IP
         * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
         * 果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
         */
        public static String getIpAddr(HttpServletRequest request) {
            String ip = null;
            try {
                ip = request.getHeader("x-forwarded-for");
                if (ip == null || "unknown".equalsIgnoreCase(ip)) {
                    ip = request.getHeader("Proxy-Client-IP");
                }
                if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                    ip = request.getHeader("WL-Proxy-Client-IP");
                }
                if (ip == null || "unknown".equalsIgnoreCase(ip)) {
                    ip = request.getHeader("HTTP_CLIENT_IP");
                }
                if (ip == null || "unknown".equalsIgnoreCase(ip)) {
                    ip = request.getHeader("HTTP_X_FORWARDED_FOR");
                }
                if (ip == null || "unknown".equalsIgnoreCase(ip)) {
                    ip = request.getRemoteAddr();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            //使用代理，则获取第一个IP地址
            if (ip == null) {
                if (ip.indexOf(",") > 0) {
                    ip = ip.substring(0, ip.indexOf(","));
                }
            }
            return ip;
        }
    
        /**
         * 2.通过调用接口的方式获取IP
         */
        public static String getIp() {
            try {
                URL realUrl = new URL("http://whois.pconline.com.cn/ipJson.jsp");
                HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
                conn.setRequestMethod("GET");
                conn.setUseCaches(false);
                conn.setReadTimeout(6000);
                conn.setConnectTimeout(6000);
                conn.setInstanceFollowRedirects(false);
                int code = conn.getResponseCode();
                StringBuilder sb = new StringBuilder();
                String ip = "";
                if (code == 200) {
                    InputStream in = conn.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
                    String line;
                    while ((line = reader.readLine()) != null) {
                        sb.append(line);
                    }
                    ip = sb.substring(sb.indexOf("ip") + 5, sb.indexOf("pro") - 3);
                }
                return ip;
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }
    
        /**
         * 3.通过调用接口根据ip获取归属地
         */
        public static String getAddress(String ip) {
            try {
                URL realUrl = new URL("http://whois.pconline.com.cn/ipJson.jsp?ip=" + ip + "&json=true");
                HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
                conn.setRequestMethod("GET");
                conn.setUseCaches(false);
                conn.setReadTimeout(6000);
                conn.setConnectTimeout(6000);
                conn.setInstanceFollowRedirects(false);
                int code = conn.getResponseCode();
                StringBuilder sb = new StringBuilder();
                String ipaddr = "";
                if (code == 200) {
                    InputStream in = conn.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
                    String line;
                    while ((line = reader.readLine()) != null) {
                        sb.append(line);
                    }
                    ipaddr = ip + "=" + sb.substring(sb.indexOf("addr") + 7, sb.indexOf("regionNames") - 3);
                }
                return ipaddr;
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }
    }

## 2.测试类 ##

package com.mmg.controller;
    
    /**
     * 测试类
     */
    public class Test {
        public static void main(String[] args) {
            System.out.println(Iputil.getIpAddr());
            System.out.println(Iputil.getAddress(Iputil.getIp()));
        }
    }

通过运行这个方法，可以看到，控制台打印了IP和城市信息，也就是我们想要的`IP属地信息`啦！

![c27f1b11559746079be46e3ae2716e88.png][]

在你的项目里，你可以在登录的时候记录当前登录用户的IP和登录地点，也可以在用户发表文章和评论的时候显示出他的IP属地，非常实用哦~

## 感谢您的观看，如果对你有帮助的话，麻烦点个收藏把！ ##

[734f4cfce6eb4040aaeece6e483cb765.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/6d3eb9320a77443cb9ffd0e42f48e196.png
[c27f1b11559746079be46e3ae2716e88.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/377847f28bc84d5291db7e477937d168.png