download file from network to local use thread pool

FileDownload.java

package message;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;

public class ImgD {
    private static final String SAVE_PATH = "D:/Files/Downloads/";
    private static final ExecutorService THREAD_POOL = Executors.newFixedThreadPool(10);

    public static void main(String[] args) throws Exception {
        File file = new File("D:/Files/123.txt");
        readUrlsFromFile(file).forEach(url -> THREAD_POOL.execute(new DownloadThread(url)));
    }

    private static List<String> readUrlsFromFile(File file) throws FileNotFoundException {
        BufferedReader reader = new BufferedReader(new FileReader(file));
        return reader.lines().collect(Collectors.toList());
    }

    static class DownloadThread implements Runnable {
        private String webUrl;

        DownloadThread(String webUrl) {
            this.webUrl = webUrl;
        }

        @Override
        public void run() {
            System.out.println("url: " + webUrl);
            byte[] bytes;
            File save;
            try {
                HttpURLConnection connection = (HttpURLConnection) new URL(webUrl).openConnection();
                connection.setConnectTimeout(1000 * 3);
                connection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
                InputStream stream = connection.getInputStream();
                bytes = readInputStream(stream);
                // 太小的不要
                if (bytes.length / 1024 > 10) {
                    // 文件保存位置
                    save = new File(SAVE_PATH + "/" + UUID.randomUUID().toString().replaceAll("-", "")
                            + webUrl.substring(webUrl.lastIndexOf(".")));
                    new FileOutputStream(save).write(bytes);
                    System.out.println(" > Done");
                } else {
                    System.out.println(" > Too Small " + bytes.length);
                }
            } catch (Exception e) {
                System.out.println(" > ERR");
            }
        }
    }

    private static byte[] readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) bos.write(buffer, 0, len);
        bos.close();
        return bos.toByteArray();
    }
}