TDownload.java

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class TDownload {
    public static void main(String[] args) throws InterruptedException {
        Runnable task = () -> {
            try {
                File file = File.createTempFile("bili", "html");
                downloadFileFromURL("https://www.bilibili.com/", file);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        };
        long start = System.currentTimeMillis();
        try (ExecutorService executorService = Executors.newVirtualThreadPerTaskExecutor()) {
            for (int i = 0; i < 1000; i++) {
                executorService.submit(task);
            }
        }
        long end = System.currentTimeMillis();
        System.out.println(end - start);
    }

    private static void downloadFileFromURL(String urlString, File destination) throws IOException {
        URL website = new URL(urlString);
        ReadableByteChannel rbc = Channels.newChannel(website.openStream());
        FileOutputStream fos = new FileOutputStream(destination);
        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
        fos.close();
        rbc.close();
    }
}

virtual thread对文件io没有用的