解压缩 ePub 文件不起作用

Question

我正在开发一个应用程序来将 .epub 文件解压缩到 Android 中的 SDCARD 中。 我已经阅读了Can't Unzip EPub File TOPIC。 它适用于 .zip 文件，但不适用于 .epub 文件。 有人能告诉我问题出在哪里吗？ 这是异常日志：

03-21 13:35:44.281: W/System.err(1255): java.io.FileNotFoundException: /mnt/sdcard/unzipped11/META-INF/container.xml: open failed: ENOENT (No such file or directory)

我正在使用此代码：

private void decom() throws IOException {
    ZipFile zipFile = new ZipFile(Environment.getExternalStorageDirectory()+"/dir.zip");
    String path = Environment.getExternalStorageDirectory() + "/unzipped10/";

    Enumeration<?> files = zipFile.entries();
    _dirChecker("");
    while (files.hasMoreElements()) {
        ZipEntry entry = (ZipEntry) files.nextElement();
        Log.v("ZipEntry", ""+entry);
        Log.v("isDirectory", ""+entry.isDirectory());

        if (entry.isDirectory()) {
            File file = new File(path + entry.getName());
            file.mkdir();
            System.out.println("Create dir " + entry.getName());
        } else {
            File f = new File(path + entry.getName());
            FileOutputStream fos = new FileOutputStream(f);
            InputStream is = zipFile.getInputStream(entry);
            byte[] buffer = new byte[1024];
            int bytesRead = 0;
            while ((bytesRead = is.read(buffer)) != -1) {
                fos.write(buffer, 0, bytesRead);
            }
            fos.close();
            System.out.println("Create File " + entry.getName());
        }
    }
}

Answer 1

根据您对我的评论的回复，听起来在尝试写入存档中文件的条目之前未创建文件的父目录。

听起来您可能需要更改处理 zip 文件中文件条目的代码以创建父目录（如果它们尚不存在）。您可能还需要更改创建目录的代码，以在创建目录之前检查目录是否已存在。

试试这样的：

    while (files.hasMoreElements()) {
        ZipEntry entry = (ZipEntry) files.nextElement();
        Log.d(TAG, "ZipEntry: "+entry);
        Log.d(TAG, "isDirectory: " + entry.isDirectory());

        if (entry.isDirectory()) {
            File file = new File(path + entry.getName());
            file.mkdir();
            Log.d(TAG, "Create dir " + entry.getName());
        } else {
            File f = new File(path + entry.getName());
            f.getParentFile().mkdirs();
            FileOutputStream fos = new FileOutputStream(f);
            InputStream is = zipFile.getInputStream(entry);
            byte[] buffer = new byte[1024];
            int bytesRead = 0;
            while ((bytesRead = is.read(buffer)) != -1) {
                fos.write(buffer, 0, bytesRead);
            }
            fos.close();
            Log.d(TAG, "Create File " + entry.getName());
        }
    }
    Log.d(TAG, "Done extracting epub file");

对我来说，这会使用测试 epub 产生以下输出（来自 Google 的 epub 示例的 moby dick：https://code.google.com/p/epub-samples/downloads/list）

ZipEntry: mimetype
isDirectory: false
Create File mimetype
ZipEntry: META-INF/
isDirectory: true
Create dir META-INF/
ZipEntry: META-INF/container.xml
isDirectory: false
Create File META-INF/container.xml
ZipEntry: OPS/
isDirectory: true
Create dir OPS/
ZipEntry: OPS/chapter_001.xhtml
isDirectory: false
Create File OPS/chapter_001.xhtml
ZipEntry: OPS/chapter_002.xhtml
isDirectory: false
Create File OPS/chapter_002.xhtml
ZipEntry: OPS/chapter_003.xhtml
isDirectory: false
...
Create File OPS/toc-short.xhtml
ZipEntry: OPS/toc.xhtml
isDirectory: false
Create File OPS/toc.xhtml
Done extracting epub file