利用com.maxmind.db根据ip地址获取地理位置信息

傷城~ 2022-06-08 14:16 377阅读 0赞

# 利用com.maxmind.db根据ip地址获取地理位置信息 #

## 1 添加Maven依赖 ##

<dependency>
        <groupId>com.maxmind.db</groupId>
        <artifactId>maxmind-db</artifactId>
        <version>1.0.0</version>
    </dependency>

## 2 用法 ##

### 2.1 简单示例 ###

File database = new File("/path/to/database/GeoIP2-City.mmdb");
    Reader reader = new Reader(database);
    
    InetAddress address = InetAddress.getByName("24.24.24.24");
    
    JsonNode response = reader.get(address);
    
    System.out.println(response);
    
    reader.close();

## 案例(获取国家和省份信息工具类) ##

import com.fasterxml.jackson.databind.JsonNode;
    import com.maxmind.db.Reader;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.InetAddress;
    import java.util.HashMap;
    import java.util.Map;
    
    public class GeoLiteUtil { 
        private static Reader reader = null;
    
        private static Map<String, String> cache = new HashMap<String, String>();
    
        static {
            try {
                ClassLoader loader = Thread.currentThread().getContextClassLoader();
                InputStream in = loader.getResource("GeoLite2-City.mmdb").openStream();
                reader = new Reader(in);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
    
        /** * 获取条目 * * @param ip * @return */
        public static String getEntry(String ip) {
            String entry = cache.get(ip);
            try {
                if (entry == null) {
                    JsonNode node = reader.get(InetAddress.getByName(ip));
                    if (node == null){
                        return "未知国家,未知省份";
                    }
                    String country = node.get("country").get("names").get("zh-CN").textValue();
                    String province = node.get("subdivisions").get(0).get("names").get("zh-CN").textValue();
                    entry = country + "," + province;
                    cache.put(ip, entry);
                }
    
            } catch (IOException e) {
                System.out.println(ip + " = null");
            }
            return entry;
        }
    
        public static String getCountry(String ip) {
            String entry = getEntry(ip);
            if (entry != null) {
                return entry.split(",")[0];
            }
            return null;
        }
    
        public static String getProvince(String ip) {
            String entry = getEntry(ip);
            if (entry != null) {
                return entry.split(",")[1];
            }
            return null;
        }
    }