java - Android - 文件下载问题 - 文件不完整

Question

我检查了很多代码 fragment ，尝试过使用和不使用缓冲区，但我无法将整个文件下载到 SD 卡。我当前使用的代码是:

    try {
        url = new URL("http://mywebsite.com/directory/");
    } catch (MalformedURLException e1) { }

    String filename = "someKindOfFile.jpg"; // this won't be .jpg in future

    File folder = new File(PATH); // TODO: add checking if folder exist
    if (folder.mkdir()) Log.i("MKDIR", "Folder created");
    else Log.i("MKDIR", "Folder not created");
    File file = new File(folder, filename);

    try {
        conn = url.openConnection();
        is = conn.getInputStream();

        BufferedInputStream bis = new BufferedInputStream(is);
        ByteArrayBuffer baf = new ByteArrayBuffer(50);
        int current = 0;
        while ((current = bis.read()) != -1) {
                baf.append((byte) current);
        }
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(baf.toByteArray());
        fos.close();
        is.close();
    } catch (IOException e) { }

此代码在 SD 卡上创建目录，但仅下载 77 字节的文件。可能是什么问题？

Answer 1

这里的错误是他正在编写转换为 byte 数据类型的 count 变量，而不是从输入流读取的字节(这些字节应该存储在临时 byte[]缓冲区通过bis.read(buffer))正确的代码块应该是:

BufferedInputStream bis = new BufferedInputStream(is);
FileOutputStream fos = new FileOutputStream(file);
int current = 0;
byte[] buffer = new byte[1024];
while ((current = bis.read(buffer)) != -1) {
    fos.write(buffer, 0, current);
}
fos.close();
is.close();