java - 这是用 Java 下载文件的最佳方式吗？

Question

public void download(String url, String destination) {
        BufferedOutputStream localBufferedOutputStream = null;
        URLConnection localURLConnection = null;
        InputStream localInputStream = null;
        try {
            URL localURL = new URL(url);

            localBufferedOutputStream = new BufferedOutputStream(new FileOutputStream(destination));
            localURLConnection = localURL.openConnection();
            localInputStream = localURLConnection.getInputStream();

            byte[] arrayOfByte = new byte[1024];
            int i;
            while ((i = localInputStream.read(arrayOfByte)) != -1) {
                localBufferedOutputStream.write(arrayOfByte, 0, i);
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            try {
                if (localInputStream != null) {
                    localInputStream.close();
                }
                if (localBufferedOutputStream != null) {
                    localBufferedOutputStream.close();
                }
            } catch (IOException localIOException3) {
                System.out.println(localIOException3);
            }
        }
    }

我正在调试我的应用程序，它似乎有点慢。我想知道这是不是我的互联网。这是用java下载文件的正确方法吗？文件大小为 26mb。

Answer 1

您应该始终关注 Apache 等库。他们为您完成了所有艰苦的工作: http://commons.apache.org/io/api-release/org/apache/commons/io/FileUtils.html

我用

static String   readFileToString(File file)
          Reads the contents of a file into a String using the default encoding for the VM.

很多。

如果您知道自己有一个 URL(因此流式传输)，请查看: http://commons.apache.org/io/api-1.4/org/apache/commons/io/IOUtils.html