java - 解压缩文件将文件转换为字节

Question

我有应用程序从 url 下载 .zip 文件并将每个文件从 .zip 文件转换为字节数组。目前我能够下载文件读取 .zip 文件并将整个 .zip 文件转换为字节，但在将 .zip 中的每个文件转换为字节数组时遇到了麻烦。任何帮助将不胜感激。我在下面附上了我的代码:

try {
    URL url = new URL(Url);
    //create the new connection
    HttpURLConnection urlConnection = (HttpURLConnection)                                url.openConnection();

    //set up some things on the connection
    urlConnection.setRequestMethod("GET");
    urlConnection.setDoOutput(true); 
    //and connect!
    urlConnection.connect();
    //set the path where we want to save the file
    //in this case, going to save it on the root directory of the
    //sd card.
    InputStream inputStream = urlConnection.getInputStream();
    dis = new DataInputStream(new BufferedInputStream(inputStream));
    System.out.println("INput connection done>>>>>");

    zis = new ZipInputStream(new BufferedInputStream(dis));

    String targetFolder="/sdcard/";

    System.out.println("zip available is"+zis.available());

    int extracted = 0;

    while ((entry = zis.getNextEntry()) != null) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int count;

        while ((count = zis.read(buffer)) != -1) {
            baos.write(buffer, 0, count);
        }

        String filename = entry.getName();
        System.out.println("File name is>>"+filename);

        byte[] bytes = baos.toByteArray();
        System.out.println("Bytes is >>>>"+bytes.toString());
        // do something with 'filename' and 'bytes'...
        zis.closeEntry();

        extracted ++;
    }

    zis.close();

} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

Answer 1

您的行 while ((count = zis.read(buffer)) != -1) 循环读取整个 zip 文件。你想要做的是 count = zis.read(buffer, 0, entry.getSize())。这将在一个命令中将每个 zip 文件条目的内容转储到您的缓冲区中。

并且您需要使该字节数组更大。

或者，您可以保留您的小缓冲区，但只需确保对于主循环的每次迭代，您只读取 entry.getSize() 个字节，否则您将最终读取整个文件。