Package org.apache.tools.zip

Class ZipFile

java.lang.Object
org.apache.tools.zip.ZipFile
All Implemented Interfaces:
Closeable, AutoCloseable
public class ZipFile extends Object implements Closeable
Replacement for java.util.ZipFile.

This class adds support for file name encodings other than UTF-8 (which is required to work on ZIP files created by native zip tools and is able to skip a preamble like the one found in self extracting archives. Furthermore it returns instances of org.apache.tools.zip.ZipEntry instead of java.util.zip.ZipEntry.

It doesn't extend java.util.zip.ZipFile as it would have to reimplement all methods anyway. Like java.util.ZipFile, it uses RandomAccessFile under the covers and supports compressed and uncompressed entries. As of Apache Ant 1.9.0 it also transparently supports Zip64 extensions and thus individual entries and archives larger than 4 GB or with more than 65536 entries.

The method signatures mimic the ones of java.util.zip.ZipFile, with a couple of exceptions:

  • There is no getName method.
  • entries has been renamed to getEntries.
  • getEntries and getEntry return org.apache.tools.zip.ZipEntry instances.
  • close is allowed to throw IOException.

  • Constructor Details

    • ZipFile

      public ZipFile(File f) throws IOException
      Opens the given file for reading, assuming the platform's native encoding for file names.
      Parameters:
      f - the archive.
      Throws:
      IOException - if an error occurs while reading the file.

    • ZipFile

      public ZipFile(String name) throws IOException
      Opens the given file for reading, assuming the platform's native encoding for file names.
      Parameters:
      name - name of the archive.
      Throws:
      IOException - if an error occurs while reading the file.

    • ZipFile

      public ZipFile(String name, String encoding) throws IOException
      Opens the given file for reading, assuming the specified encoding for file names, scanning unicode extra fields.
      Parameters:
      name - name of the archive.
      encoding - the encoding to use for file names, use null for the platform's default encoding
      Throws:
      IOException - if an error occurs while reading the file.

    • ZipFile

      public ZipFile(File f, String encoding) throws IOException
      Opens the given file for reading, assuming the specified encoding for file names and scanning for unicode extra fields.
      Parameters:
      f - the archive.
      encoding - the encoding to use for file names, use null for the platform's default encoding
      Throws:
      IOException - if an error occurs while reading the file.

    • ZipFile

      public ZipFile(File f, String encoding, boolean useUnicodeExtraFields) throws IOException
      Opens the given file for reading, assuming the specified encoding for file names.
      Parameters:
      f - the archive.
      encoding - the encoding to use for file names, use null for the platform's default encoding
      useUnicodeExtraFields - whether to use InfoZIP Unicode Extra Fields (if present) to set the file names.
      Throws:
      IOException - if an error occurs while reading the file.

  • Method Details

    • getEncoding

      public String getEncoding()
      The encoding to use for filenames and the file comment.
      Returns:
      null if using the platform's default character encoding.

    • close

      public void close() throws IOException
      Closes the archive.
      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in interface Closeable
      Throws:
      IOException - if an error occurs closing the archive.

    • closeQuietly

      public static void closeQuietly(ZipFile zipfile)
      close a zipfile quietly; throw no io fault, do nothing on a null parameter
      Parameters:
      zipfile - file to close, can be null

    • getEntries

      public Enumeration<ZipEntry> getEntries()
      Returns all entries.

      Entries will be returned in the same order they appear within the archive's central directory.

      Returns:
      all entries as ZipEntry instances

    • getEntriesInPhysicalOrder

      public Enumeration<ZipEntry> getEntriesInPhysicalOrder()
      Returns all entries in physical order.

      Entries will be returned in the same order their contents appear within the archive.

      Returns:
      all entries as ZipEntry instances
      Since:
      Ant 1.9.0

    • getEntry

      public ZipEntry getEntry(String name)
      Returns a named entry - or null if no entry by that name exists.

      If multiple entries with the same name exist the first entry in the archive's central directory by that name is returned.

      Parameters:
      name - name of the entry.
      Returns:
      the ZipEntry corresponding to the given name - or null if not present.

    • getEntries

      public Iterable<ZipEntry> getEntries(String name)
      Returns all named entries in the same order they appear within the archive's central directory.
      Parameters:
      name - name of the entry.
      Returns:
      the Iterable<ZipEntry> corresponding to the given name
      Since:
      1.9.2

    • getEntriesInPhysicalOrder

      public Iterable<ZipEntry> getEntriesInPhysicalOrder(String name)
      Returns all named entries in the same order their contents appear within the archive.
      Parameters:
      name - name of the entry.
      Returns:
      the Iterable<ZipEntry> corresponding to the given name
      Since:
      1.9.2

    • canReadEntryData

      public boolean canReadEntryData(ZipEntry ze)
      Whether this class is able to read the given entry.

      May return false if it is set up to use encryption or a compression method that hasn't been implemented yet.

      Parameters:
      ze - ZipEntry
      Returns:
      boolean

    • getInputStream

      public InputStream getInputStream(ZipEntry ze) throws IOException, ZipException
      Returns an InputStream for reading the contents of the given entry.
      Parameters:
      ze - the entry to get the stream for.
      Returns:
      a stream to read the entry from.
      Throws:
      IOException - if unable to create an input stream from the zipentry
      ZipException - if the zipentry uses an unsupported feature

    • getName

      public String getName()

    • finalize

      protected void finalize() throws Throwable
      Ensures that the close method of this zipfile is called when there are no more references to it.
      Overrides:
      finalize in class Object
      Throws:
      Throwable
      See Also: