官网地址：https://github.com/lionsoul2014/ip2region/blob/master/ReadMe.md
介绍：具体看github上的readme文档
使用说明：
在github上下载ip2region_v4.xdb，并放在项目的src/main/resources下。下载地址：ip2region/data/ip2region_v4.xdb at master · lionsoul2014/ip2region
引入依赖：
<dependency><groupId>org.lionsoul</groupId><artifactId>ip2region</artifactId><version>2.6.5</version></dependency>测试数据：text.txt
106.39.41.166,10/Nov/2016:00:01:02 +0800,10,54 ,video,8701
113.140.11.123,10/Nov/2016:00:01:02 +0800,10,54 ,video,5915
125.122.216.102,10/Nov/2016:00:01:02 +0800,10,54 ,video,9819
116.231.219.242,10/Nov/2016:00:01:02 +0800,10,54 ,video,6335
61.136.143.62,10/Nov/2016:00:01:02 +0800,10,54 ,video,7629
39.186.247.142,10/Nov/2016:00:01:02 +0800,10,2957 ,video,3237具体代码：
IpRegionProcessor
import org.lionsoul.ip2region.xdb.Searcher;import java.io.*;
import java.util.ArrayList;
import java.util.List;public class IpRegionProcessor {public static void main(String[] args) {// 数据库文件路径String dbPath = "src/main/resources/ip2region_v4.xdb";// 输入文件路径String inputFilePath = "d:\\IdeaProjects\\da12.15\\test.txt";// 输出文件路径String outputFilePath = "d:\\IdeaProjects\\da12.15\\output.txt";Searcher searcher = null;try {// 1. 加载整个xdb文件到内存byte[] cBuff = Searcher.loadContentFromFile(dbPath);// 2. 创建基于内存的查询对象searcher = Searcher.newWithBuffer(cBuff);// 3. 读取输入文件内容List<String> lines = readFile(inputFilePath);// 4. 处理每一行List<String> processedLines = processLines(lines, searcher);// 5. 写入输出文件writeFile(outputFilePath, processedLines);System.out.println("文件处理完成，结果已保存到: " + outputFilePath);} catch (Exception e) {System.err.println("处理文件时发生错误: " + e.getMessage());e.printStackTrace();} finally {// 6. 关闭资源if (searcher != null) {try {searcher.close();} catch (IOException e) {System.err.println("关闭Searcher时发生错误: " + e.getMessage());e.printStackTrace();}}}}/*** 读取文件内容*/private static List<String> readFile(String filePath) throws IOException {List<String> lines = new ArrayList<>();try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {String line;while ((line = reader.readLine()) != null) {lines.add(line);}}return lines;}/*** 写入文件内容*/private static void writeFile(String filePath, List<String> lines) throws IOException {try (BufferedWriter writer = new BufferedWriter(new FileWriter(filePath))) {for (String line : lines) {writer.write(line);writer.newLine();}}}/*** 处理每一行，将IP地址转换为城市（ip）格式*/private static List<String> processLines(List<String> lines, Searcher searcher) throws Exception {List<String> processedLines = new ArrayList<>();for (String line : lines) {if (line.isEmpty()) {processedLines.add(line);continue;}// 提取第一个逗号前的IP地址int commaIndex = line.indexOf(',');if (commaIndex == -1) {processedLines.add(line);continue;}String ip = line.substring(0, commaIndex).trim();String restOfLine = line.substring(commaIndex);// 查询IP对应的区域信息String region = searcher.search(ip);String city = extractCity(region);// 构建新的行：城市（ip） + 剩余内容String newLine = city + "(" + ip + ")" + restOfLine;processedLines.add(newLine);}return processedLines;}/*** 从region信息中提取城市名* region格式：国家|省份|城市|ISP*/private static String extractCity(String region) {if (region == null || region.isEmpty()) {return "未知城市";}String[] parts = region.split("\\|");if (parts.length >= 3) {// 第三部分是城市return parts[2];} else if (parts.length == 2) {// 如果没有城市信息，返回省份return parts[1];} else {// 否则返回国家return parts[0];}}
}运行结果：output.txt
北京市(106.39.41.166),10/Nov/2016:00:01:02 +0800,10,54 ,video,8701
西安市(113.140.11.123),10/Nov/2016:00:01:02 +0800,10,54 ,video,5915
杭州市(125.122.216.102),10/Nov/2016:00:01:02 +0800,10,54 ,video,9819
上海市(116.231.219.242),10/Nov/2016:00:01:02 +0800,10,54 ,video,6335
宜昌市(61.136.143.62),10/Nov/2016:00:01:02 +0800,10,54 ,video,7629
杭州市(39.186.247.142),10/Nov/2016:00:01:02 +0800,10,2957 ,video,3237