阅读zip文件中的zip文件

Question

我有zip文件在zip文件的文件夹里面,请建议我如何使用zip输入流阅读它.

例如:

abc.zip
    |
      documents/bcd.zip

如何在zip文件中读取zip文件？

Answer 1

如果你想以递归方式查看zip文件中的zip文件,

    public void lookupSomethingInZip(InputStream fileInputStream) throws IOException {
        ZipInputStream zipInputStream = new ZipInputStream(fileInputStream);
        String entryName = "";
        ZipEntry entry = zipInputStream.getNextEntry();
        while (entry!=null) {
            entryName = entry.getName();
            if (entryName.endsWith("zip")) {
                //recur if the entry is a zip file
                lookupSomethingInZip(zipInputStream);
            }
            //do other operation with the entries..

            entry=zipInputStream.getNextEntry();
        }
    }

使用从文件派生的文件输入流调用方法 -

File file = new File(name);
lookupSomethingInZip(new FileInputStream(file));

Answer 2

以下代码段列出了另一个ZIP文件中ZIP文件的条目.根据您的需求进行调整.在引擎盖下ZipFile使用ZipInputStreams.

所述代码段使用Apache的百科全书IO,具体IOUtils.copy.

public static void readInnerZipFile(File zipFile, String innerZipFileEntryName) {
    ZipFile outerZipFile = null;
    File tempFile = null;
    FileOutputStream tempOut = null;
    ZipFile innerZipFile = null;
    try {
        outerZipFile = new ZipFile(zipFile);
        tempFile = File.createTempFile("tempFile", "zip");
        tempOut = new FileOutputStream(tempFile);
        IOUtils.copy( //
                outerZipFile.getInputStream(new ZipEntry(innerZipFileEntryName)), //
                tempOut);
        innerZipFile = new ZipFile(tempFile);
        Enumeration<? extends ZipEntry> entries = innerZipFile.entries();
        while (entries.hasMoreElements()) {
            ZipEntry entry = entries.nextElement();
            System.out.println(entry);
            // InputStream entryIn = innerZipFile.getInputStream(entry);
        }

    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        // Make sure to clean up your I/O streams
        try {
            if (outerZipFile != null)
                outerZipFile.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        IOUtils.closeQuietly(tempOut);
        if (tempFile != null && !tempFile.delete()) {
            System.out.println("Could not delete " + tempFile);
        }
        try {
            if (innerZipFile != null)
                innerZipFile.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public static void main(String[] args) {
    readInnerZipFile(new File("abc.zip"), "documents/bcd.zip");
}