CODEWITHSUNDEEP
javaandroid
user1719863
user1719863

Reputation: 797

How to zip a single string with ZipOutputStream and save as a readable string

I tried to compress a string with DeflaterOutputStream and converted the output with base64 to save the result in another string

public static String compress(String str) throws IOException {
    byte[] data = str.getBytes("UTF-8");
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    java.util.zip.Deflater compresser = new java.util.zip.Deflater(java.util.zip.Deflater.BEST_COMPRESSION, true);
    DeflaterOutputStream deflaterOutputStream = new DeflaterOutputStream(stream, cozmpresser);
    deflaterOutputStream.write(data);
    deflaterOutputStream.close();
    byte[] output = stream.toByteArray();
    return Base64Coder.encodeLines(output);
}

Now i wish to try ZipOutputStream. i tried

public static String compress(String str) throws IOException {
    byte[] data = str.getBytes("UTF-8");
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    ZipOutputStream deflaterOutputStream = new ZipOutputStream(stream);
    deflaterOutputStream.setMethod(ZipOutputStream.DEFLATED);
    deflaterOutputStream.setLevel(8);
    deflaterOutputStream.write(data);
    deflaterOutputStream.close();
    byte[] output = stream.toByteArray();
    return Base64Coder.encodeLines(output);
}

But dont work. ZipOutputStream seems orientated to a structure of folders and files how can I do?

Upvotes: 2

Views: 5578

Answers (1)

Brian Clapper
Brian Clapper

Reputation: 26210

ZipOutputStream is intended to produce a Zip file, which, as you noticed, is generally used as a container for files and folders (a "compressed folder" or "compressed directory tree", in other words).

If you merely want to compress a string and then convert it to some printable form, ZipOutputStream isn't really the right choice. GZIPOutputStream is more appropriate to that purpose, in my opinion.

Since you marked this question with an android tag, note the comment here: http://developer.android.com/reference/java/util/zip/GZIPOutputStream.html

Using GZIPOutputStream is a little easier than ZipOutputStream because GZIP is only for compression, and is not a container for multiple files.

Upvotes: 2

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