根据IP查询用户地理位置

一、从request请求中获取用户ip地址

package com.ssy.utils;

import javax.servlet.http.HttpServletRequest;

public class IPUtil {

    public static String getIPAddress(HttpServletRequest request) {
        String ip = null;


        //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();
        }
        return ip;
    }

}

二、调用淘宝api解析IP地址

package com.ssy.utils;

import java.io.UnsupportedEncodingException;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class AddressUtil {
    public static String getAddresses(String content, String encodingString)
            throws UnsupportedEncodingException {
        // 这里调用淘宝API
        String urlStr = "http://ip.taobao.com/service/getIpInfo.php";
        // 从http://whois.pconline.com.cn取得IP所在的省市区信息
        String returnStr = getResult(urlStr, content, encodingString);
        if (returnStr != null) {
            // 处理返回的省市区信息
            returnStr = decodeUnicode(returnStr);
            String[] temp = returnStr.split(",");
            if (temp.length < 3) {
                return "0";//无效IP，局域网测试
            }
            return returnStr;
        }
        return null;
    }

    private static String getResult(String urlStr, String content, String encoding) {
        URL url = null;
        HttpURLConnection connection = null;
        try {
            url = new URL(urlStr);
            connection = (HttpURLConnection) url.openConnection();// 新建连接实例
            connection.setConnectTimeout(8000);// 设置连接超时时间，单位毫秒
            connection.setReadTimeout(8000);// 设置读取数据超时时间，单位毫秒
            connection.setDoOutput(true);// 是否打开输出流 true|false
            connection.setDoInput(true);// 是否打开输入流true|false
            connection.setRequestMethod("POST");// 提交方法POST|GET
            connection.setUseCaches(false);// 是否缓存true|false
            connection.connect();// 打开连接端口
            DataOutputStream out = new DataOutputStream(connection
                    .getOutputStream());// 打开输出流往对端服务器写数据
            out.writeBytes(content);// 写数据,也就是提交你的表单 name=xxx&pwd=xxx
            out.flush();// 刷新
            out.close();// 关闭输出流
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    connection.getInputStream(), encoding));// 往对端写完数据对端服务器返回数据
            // ,以BufferedReader流来读取
            StringBuilder buffer = new StringBuilder();
            String line = "";
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }
            reader.close();
            return buffer.toString();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.disconnect();// 关闭连接
            }
        }
        return null;
    }

    /**
     * unicode 转换成 中文
     */
    public static String decodeUnicode(String theString) {
        char aChar;
        int len = theString.length();
        StringBuilder outBuffer = new StringBuilder(len);
        for (int x = 0; x < len; ) {
            aChar = theString.charAt(x++);
            if (aChar == '\') {
                aChar = theString.charAt(x++);
                if (aChar == 'u') {
                    int value = 0;
                    for (int i = 0; i < 4; i++) {
                        aChar = theString.charAt(x++);
                        switch (aChar) {
                            case '0':
                            case '1':
                            case '2':
                            case '3':
                            case '4':
                            case '5':
                            case '6':
                            case '7':
                            case '8':
                            case '9':
                                value = (value << 4) + aChar - '0';
                                break;
                            case 'a':
                            case 'b':
                            case 'c':
                            case 'd':
                            case 'e':
                            case 'f':
                                value = (value << 4) + 10 + aChar - 'a';
                                break;
                            case 'A':
                            case 'B':
                            case 'C':
                            case 'D':
                            case 'E':
                            case 'F':
                                value = (value << 4) + 10 + aChar - 'A';
                                break;
                            default:
                                throw new IllegalArgumentException(
                                        "Malformed      encoding.");
                        }
                    }
                    outBuffer.append((char) value);
                } else {
                    if (aChar == 't') {
                        aChar = '	';
                    } else if (aChar == 'r') {
                        aChar = '
';
                    } else if (aChar == 'n') {
                        aChar = '
';
                    } else if (aChar == 'f') {
                        aChar = 'f';
                    }
                    outBuffer.append(aChar);
                }
            } else {
                outBuffer.append(aChar);
            }
        }
        return outBuffer.toString();
    }
}

三、使用geoLite2-city数据库文件解析IP地址

将GeoLite2-City.mmdb导入resources下，获取InputStream。

链接：https://pan.baidu.com/s/1CFNm7Z6agWKAHlNZOSD0OA
提取码：r6dd

package com.ssy.utils;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.util.Arrays;
import java.util.concurrent.locks.ReentrantLock;

import com.maxmind.geoip2.DatabaseReader;
import com.maxmind.geoip2.model.CityResponse;
import com.maxmind.geoip2.record.City;
import com.maxmind.geoip2.record.Country;
import com.maxmind.geoip2.record.Subdivision;

public class AddressUtil {

    private static DatabaseReader reader;
    private static ReentrantLock lock = new ReentrantLock();

    static {
        load();
    }

    public static String findOne(String ip) {
        String[] ipAddrs = find(ip);
        if (ipAddrs != null && ipAddrs.length > 0) {
            StringBuilder addrBuilder = new StringBuilder();
            for (String addr : ipAddrs) {
                addrBuilder.append(addr);
            }
            return addrBuilder.toString();
        }
        return null;
    }

    public static String[] find(String ip) {
        try {
            String addr[] = new String[3];
            InetAddress ipAddress = InetAddress.getByName(ip);
            // 获取查询结果
            CityResponse response = reader.city(ipAddress);
            // 获取国家名称
            Country country = response.getCountry();
            addr[0] = country.getNames().get("zh-CN");
            // 获取省分名称
            Subdivision subdivision = response.getMostSpecificSubdivision();
            addr[1] = subdivision.getNames().get("zh-CN") == null? "":subdivision.getNames().get("zh-CN");
            // 获取城市名称
            City city = response.getCity();
            addr[2] = city.getNames().get("zh-CN")== null? "":city.getNames().get("zh-CN");
            return addr;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void load() {
        lock.lock();
        // 创建 GeoLite2 数据库
        InputStream database = AddressUtil.class.getResourceAsStream("/GeoLite2-City.mmdb");
        // 读取数据库内容
        try {
            reader = new DatabaseReader.Builder(database).build();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
            try {
                if (null != database) {
                    database.close();
                }
            } catch (IOException e) {
            }
        }
    }

}