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ZipInputStream


java.util.zip

Class ZipInputStream

  • All Implemented Interfaces:
    Closeable, AutoCloseable
    Direct Known Subclasses:
    JarInputStream

    public class ZipInputStream
extends InflaterInputStream
    This class provides an implementation of FilterInputStream that decompresses data from an InputStream containing a ZIP archive.

    A ZIP archive is a collection of (possibly) compressed files. When reading from a ZipInputStream, you retrieve the entry's metadata with getNextEntry before you can read the userdata.

    Although InflaterInputStream can only read compressed ZIP archive entries, this class can read non-compressed entries as well.

    Use ZipFile if you can access the archive as a file directly, especially if you want random access to entries, rather than needing to iterate over all entries.

    Example

    Using ZipInputStream is a little more complicated than GZIPInputStream because ZIP archives are containers that can contain multiple files. This code pulls all the files out of a ZIP archive, similar to the unzip(1) utility. 

     InputStream is = ...
 ZipInputStream zis = new ZipInputStream(new BufferedInputStream(is));
 try {
     ZipEntry ze;
     while ((ze = 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 = ze.getName();
         byte[] bytes = baos.toByteArray();
         // do something with 'filename' and 'bytes'...
     }
 } finally {
     zis.close();
 }
    See Also:
    ZipEntry, ZipFile


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