import java.io.*;
import java.net.URL;
import java.nio.file.Paths;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ImageDownloader {
    public static void main(String[] args) {
        String imageUrl = "https://example.com/images/"; // 图片所在的网址
        String savePath = Paths.get(System.getProperty("user.home"), "images").toString(); // 图片保存的路径
        int start = 1; // 图片编号的起始值
        int end = 10; // 图片编号的结束值
        String extension = ".jpg"; // 图片的扩展名

        ExecutorService executor = Executors.newFixedThreadPool(5); // 创建一个固定大小的线程池

        for (int i = start; i <= end; i++) {
            int finalI = i;
            executor.submit(() -> {
                String imageUrlWithNumber = imageUrl + finalI + extension;
                String savePathWithNumber = Paths.get(savePath, finalI + extension).toString();
                downloadImage(imageUrlWithNumber, savePathWithNumber);
            });
        }

        executor.shutdown(); // 关闭线程池
    }

    public static void downloadImage(String imageUrl, String savePath) {
        try {
            URL url = new URL(imageUrl);
            InputStream is = url.openStream();
            OutputStream os = new FileOutputStream(savePath);

            byte[] buffer = new byte[4096];
            int length;

            while ((length = is.read(buffer)) != -1) {
                os.write(buffer, 0, length);
            }

            is.close();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}