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ZipFile


java.util.zip

Class ZipFile

  • Direct Known Subclasses:
    JarFile


    public class ZipFile
    extends Object
    This class provides random read access to a ZIP-archive file.

    While ZipInputStream provides stream based read access to a ZIP-archive, this class implements more efficient (file based) access and makes use of the central directory within a ZIP-archive.

    Use ZipOutputStream if you want to create an archive.

    A temporary ZIP file can be marked for automatic deletion upon closing it.

    See Also:
    ZipEntry, ZipOutputStream
    • Constructor Detail

      • ZipFile

        public ZipFile(File file,
               int mode)
                throws IOException
        Opens a file as ZIP-archive. "mode" must be OPEN_READ or OPEN_DELETE . The latter sets the "delete on exit" flag through a file.
        Parameters:
        file - the ZIP file to read.
        mode - the mode of the file open operation.
        Throws:
        IOException - if an IOException occurs.
      • ZipFile

        public ZipFile(String name)
                throws IOException
        Opens a ZIP archived file.
        Parameters:
        name - the name of the ZIP file.
        Throws:
        IOException - if an IOException occurs.
    • Method Detail

      • finalize

        protected void finalize()
                         throws IOException
        Description copied from class: Object
        Invoked when the garbage collector has detected that this instance is no longer reachable. The default implementation does nothing, but this method can be overridden to free resources.

        Note that objects that override finalize are significantly more expensive than objects that don't. Finalizers may be run a long time after the object is no longer reachable, depending on memory pressure, so it's a bad idea to rely on them for cleanup. Note also that finalizers are run on a single VM-wide finalizer thread, so doing blocking work in a finalizer is a bad idea. A finalizer is usually only necessary for a class that has a native peer and needs to call a native method to destroy that peer. Even then, it's better to provide an explicit close method (and implement Closeable), and insist that callers manually dispose of instances. This works well for something like files, but less well for something like a BigInteger where typical calling code would have to deal with lots of temporaries. Unfortunately, code that creates lots of temporaries is the worst kind of code from the point of view of the single finalizer thread.

        If you must use finalizers, consider at least providing your own ReferenceQueue and having your own thread process that queue.

        Unlike constructors, finalizers are not automatically chained. You are responsible for calling super.finalize() yourself.

        Uncaught exceptions thrown by finalizers are ignored and do not terminate the finalizer thread. See Effective Java Item 7, "Avoid finalizers" for more.

        Overrides:
        finalize in class Object
        Throws:
        IOException
      • close

        public void close()
                   throws IOException
        Closes this ZIP file. This method is idempotent.
        Throws:
        IOException - if an IOException occurs.
      • entries

        public Enumeration<? extends ZipEntry> entries()
        Returns an enumeration of the entries. The entries are listed in the order in which they appear in the ZIP archive.
        Returns:
        the enumeration of the entries.
        Throws:
        IllegalStateException - if this ZIP file has been closed.
      • getEntry

        public ZipEntry getEntry(String entryName)
        Gets the ZIP entry with the specified name from this ZipFile.
        Parameters:
        entryName - the name of the entry in the ZIP file.
        Returns:
        a ZipEntry or null if the entry name does not exist in the ZIP file.
        Throws:
        IllegalStateException - if this ZIP file has been closed.
      • getInputStream

        public InputStream getInputStream(ZipEntry entry)
                                   throws IOException
        Returns an input stream on the data of the specified ZipEntry.
        Parameters:
        entry - the ZipEntry.
        Returns:
        an input stream of the data contained in the ZipEntry.
        Throws:
        IOException - if an IOException occurs.
        IllegalStateException - if this ZIP file has been closed.
      • getName

        public String getName()
        Gets the file name of this ZipFile.
        Returns:
        the file name of this ZipFile.
      • size

        public int size()
        Returns the number of ZipEntries in this ZipFile.
        Returns:
        the number of entries in this file.
        Throws:
        IllegalStateException - if this ZIP file has been closed.


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