在java中下载多个文件

import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class MultiFileDownloader {
    public static void main(String[] args) {
        List<String> fileUrls = new ArrayList<>();
        fileUrls.add("https://example.com/file1.txt");
        fileUrls.add("https://example.com/file2.txt");
        fileUrls.add("https://example.com/file3.txt");

        List<Thread> downloadThreads = new ArrayList<>();

        for (String url : fileUrls) {
            Thread thread = new Thread(() -> {
                try {
                    downloadFile(url);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
            thread.start();
            downloadThreads.add(thread);
        }

        // 等待所有下载线程完成
        for (Thread thread : downloadThreads) {
            try {
                thread.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        System.out.println("所有文件下载完成");
    }

    private static void downloadFile(String fileUrl) throws IOException {
        URL url = new URL(fileUrl);
        String fileName = fileUrl.substring(fileUrl.lastIndexOf("/") + 1);
        try (BufferedInputStream in = new BufferedInputStream(url.openStream());
             FileOutputStream fileOutputStream = new FileOutputStream(fileName)) {
            byte[] dataBuffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = in.read(dataBuffer, 0, 1024)) != -1) {
                fileOutputStream.write(dataBuffer, 0, bytesRead);
            }
        }
        System.out.println("文件下载完成: " + fileName);
    }
}