ZipFile (Java Platform SE 8 )
Keywords: java.util.zip.ZipFile class
Date: 2015-11-18

compact1, compact2, compact3
java.util.zip

## Class ZipFile

- java.lang.Object
- - java.util.zip.ZipFile

- All Implemented Interfaces:
    Closeable, AutoCloseable
  Direct Known Subclasses:
    JarFile

      public class ZipFile
      extends Object
      implements Closeable

  This class is used to read entries from a zip file.

  Unless otherwise noted, passing a `null` argument to a constructor or method in this class will cause a `NullPointerException` to be thrown.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `CENATT`
    `static int` | `CENATX`
    `static int` | `CENCOM`
    `static int` | `CENCRC`
    `static int` | `CENDSK`
    `static int` | `CENEXT`
    `static int` | `CENFLG`
    `static int` | `CENHDR`
    `static int` | `CENHOW`
    `static int` | `CENLEN`
    `static int` | `CENNAM`
    `static int` | `CENOFF`
    `static long` | `CENSIG`
    `static int` | `CENSIZ`
    `static int` | `CENTIM`
    `static int` | `CENVEM`
    `static int` | `CENVER`
    `static int` | `ENDCOM`
    `static int` | `ENDHDR`
    `static int` | `ENDOFF`
    `static long` | `ENDSIG`
    `static int` | `ENDSIZ`
    `static int` | `ENDSUB`
    `static int` | `ENDTOT`
    `static int` | `EXTCRC`
    `static int` | `EXTHDR`
    `static int` | `EXTLEN`
    `static long` | `EXTSIG`
    `static int` | `EXTSIZ`
    `static int` | `LOCCRC`
    `static int` | `LOCEXT`
    `static int` | `LOCFLG`
    `static int` | `LOCHDR`
    `static int` | `LOCHOW`
    `static int` | `LOCLEN`
    `static int` | `LOCNAM`
    `static long` | `LOCSIG`
    `static int` | `LOCSIZ`
    `static int` | `LOCTIM`
    `static int` | `LOCVER`
    `static int` | `OPEN_DELETE` Mode flag to open a zip file and mark it for deletion.
    `static int` | `OPEN_READ` Mode flag to open a zip file for reading.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `ZipFile(File file)` Opens a ZIP file for reading given the specified File object.
    `ZipFile(File file, Charset charset)` Opens a ZIP file for reading given the specified File object.
    `ZipFile(File file, int mode)` Opens a new `ZipFile` to read from the specified `File` object in the specified mode.
    `ZipFile(File file, int mode, Charset charset)` Opens a new `ZipFile` to read from the specified `File` object in the specified mode.
    `ZipFile(String name)` Opens a zip file for reading.
    `ZipFile(String name, Charset charset)` Opens a zip file for reading.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()` Closes the ZIP file.
    `Enumeration<? extends ZipEntry>` | `entries()` Returns an enumeration of the ZIP file entries.
    `protected void` | `finalize()` Ensures that the system resources held by this ZipFile object are released when there are no more references to it.
    `String` | `getComment()` Returns the zip file comment, or null if none.
    `ZipEntry` | `getEntry(String name)` Returns the zip file entry for the specified name, or null if not found.
    `InputStream` | `getInputStream(ZipEntry entry)` Returns an input stream for reading the contents of the specified zip file entry.
    `String` | `getName()` Returns the path name of the ZIP file.
    `int` | `size()` Returns the number of entries in the ZIP file.
    `Stream<? extends ZipEntry>` | `stream()` Return an ordered `Stream` over the ZIP file entries.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### OPEN_READ

          public static final int OPEN_READ

      Mode flag to open a zip file for reading.
      See Also:
        Constant Field Values

    - #### OPEN_DELETE

          public static final int OPEN_DELETE

      Mode flag to open a zip file and mark it for deletion. The file will be deleted some time between the moment that it is opened and the moment that it is closed, but its contents will remain accessible via the `ZipFile` object until either the close method is invoked or the virtual machine exits.
      See Also:
        Constant Field Values

    - #### LOCSIG

          public static final long LOCSIG

      See Also:
        Constant Field Values

    - #### EXTSIG

          public static final long EXTSIG

      See Also:
        Constant Field Values

    - #### CENSIG

          public static final long CENSIG

      See Also:
        Constant Field Values

    - #### ENDSIG

          public static final long ENDSIG

      See Also:
        Constant Field Values

    - #### LOCHDR

          public static final int LOCHDR

      See Also:
        Constant Field Values

    - #### EXTHDR

          public static final int EXTHDR

      See Also:
        Constant Field Values

    - #### CENHDR

          public static final int CENHDR

      See Also:
        Constant Field Values

    - #### ENDHDR

          public static final int ENDHDR

      See Also:
        Constant Field Values

    - #### LOCVER

          public static final int LOCVER

      See Also:
        Constant Field Values

    - #### LOCFLG

          public static final int LOCFLG

      See Also:
        Constant Field Values

    - #### LOCHOW

          public static final int LOCHOW

      See Also:
        Constant Field Values

    - #### LOCTIM

          public static final int LOCTIM

      See Also:
        Constant Field Values

    - #### LOCCRC

          public static final int LOCCRC

      See Also:
        Constant Field Values

    - #### LOCSIZ

          public static final int LOCSIZ

      See Also:
        Constant Field Values

    - #### LOCLEN

          public static final int LOCLEN

      See Also:
        Constant Field Values

    - #### LOCNAM

          public static final int LOCNAM

      See Also:
        Constant Field Values

    - #### LOCEXT

          public static final int LOCEXT

      See Also:
        Constant Field Values

    - #### EXTCRC

          public static final int EXTCRC

      See Also:
        Constant Field Values

    - #### EXTSIZ

          public static final int EXTSIZ

      See Also:
        Constant Field Values

    - #### EXTLEN

          public static final int EXTLEN

      See Also:
        Constant Field Values

    - #### CENVEM

          public static final int CENVEM

      See Also:
        Constant Field Values

    - #### CENVER

          public static final int CENVER

      See Also:
        Constant Field Values

    - #### CENFLG

          public static final int CENFLG

      See Also:
        Constant Field Values

    - #### CENHOW

          public static final int CENHOW

      See Also:
        Constant Field Values

    - #### CENTIM

          public static final int CENTIM

      See Also:
        Constant Field Values

    - #### CENCRC

          public static final int CENCRC

      See Also:
        Constant Field Values

    - #### CENSIZ

          public static final int CENSIZ

      See Also:
        Constant Field Values

    - #### CENLEN

          public static final int CENLEN

      See Also:
        Constant Field Values

    - #### CENNAM

          public static final int CENNAM

      See Also:
        Constant Field Values

    - #### CENEXT

          public static final int CENEXT

      See Also:
        Constant Field Values

    - #### CENCOM

          public static final int CENCOM

      See Also:
        Constant Field Values

    - #### CENDSK

          public static final int CENDSK

      See Also:
        Constant Field Values

    - #### CENATT

          public static final int CENATT

      See Also:
        Constant Field Values

    - #### CENATX

          public static final int CENATX

      See Also:
        Constant Field Values

    - #### CENOFF

          public static final int CENOFF

      See Also:
        Constant Field Values

    - #### ENDSUB

          public static final int ENDSUB

      See Also:
        Constant Field Values

    - #### ENDTOT

          public static final int ENDTOT

      See Also:
        Constant Field Values

    - #### ENDSIZ

          public static final int ENDSIZ

      See Also:
        Constant Field Values

    - #### ENDOFF

          public static final int ENDOFF

      See Also:
        Constant Field Values

    - #### ENDCOM

          public static final int ENDCOM

      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### ZipFile

          public ZipFile(String name)
                  throws IOException

      Opens a zip file for reading.

      First, if there is a security manager, its `checkRead` method is called with the `name` argument as its argument to ensure the read is allowed.

      The UTF-8 `charset` is used to decode the entry names and comments.

      Parameters:
        `name` - the name of the zip file
      Throws:
        `ZipException` - if a ZIP format error has occurred
        `IOException` - if an I/O error has occurred
        `SecurityException` - if a security manager exists and its `checkRead` method doesn't allow read access to the file.
      See Also:
        `SecurityManager.checkRead(java.lang.String)`

    - #### ZipFile

          public ZipFile(File file,
                         int mode)
                  throws IOException

      Opens a new `ZipFile` to read from the specified `File` object in the specified mode. The mode argument must be either `OPEN_READ` or `OPEN_READ | OPEN_DELETE`.

      First, if there is a security manager, its `checkRead` method is called with the `name` argument as its argument to ensure the read is allowed.

      The UTF-8 `charset` is used to decode the entry names and comments

      Parameters:
        `file` - the ZIP file to be opened for reading
        `mode` - the mode in which the file is to be opened
      Throws:
        `ZipException` - if a ZIP format error has occurred
        `IOException` - if an I/O error has occurred
        `SecurityException` - if a security manager exists and its `checkRead` method doesn't allow read access to the file, or its `checkDelete` method doesn't allow deleting the file when the `OPEN_DELETE` flag is set.
        `IllegalArgumentException` - if the `mode` argument is invalid
      Since:
        1.3
      See Also:
        `SecurityManager.checkRead(java.lang.String)`

    - #### ZipFile

          public ZipFile(File file)
                  throws ZipException,
                         IOException

      Opens a ZIP file for reading given the specified File object.

      The UTF-8 `charset` is used to decode the entry names and comments.

      Parameters:
        `file` - the ZIP file to be opened for reading
      Throws:
        `ZipException` - if a ZIP format error has occurred
        `IOException` - if an I/O error has occurred

    - #### ZipFile

          public ZipFile(File file,
                         int mode,
                         Charset charset)
                  throws IOException

      Opens a new `ZipFile` to read from the specified `File` object in the specified mode. The mode argument must be either `OPEN_READ` or `OPEN_READ | OPEN_DELETE`.

      First, if there is a security manager, its `checkRead` method is called with the `name` argument as its argument to ensure the read is allowed.

      Parameters:
        `file` - the ZIP file to be opened for reading
        `mode` - the mode in which the file is to be opened
        `charset` - the charset to be used to decode the ZIP entry name and comment that are not encoded by using UTF-8 encoding (indicated by entry's general purpose flag).
      Throws:
        `ZipException` - if a ZIP format error has occurred
        `IOException` - if an I/O error has occurred
        `SecurityException` - if a security manager exists and its `checkRead` method doesn't allow read access to the file,or its `checkDelete` method doesn't allow deleting the file when the `OPEN_DELETE` flag is set
        `IllegalArgumentException` - if the `mode` argument is invalid
      Since:
        1.7
      See Also:
        `SecurityManager.checkRead(java.lang.String)`

    - #### ZipFile

          public ZipFile(String name,
                         Charset charset)
                  throws IOException

      Opens a zip file for reading.

      First, if there is a security manager, its `checkRead` method is called with the `name` argument as its argument to ensure the read is allowed.

      Parameters:
        `name` - the name of the zip file
        `charset` - the charset to be used to decode the ZIP entry name and comment that are not encoded by using UTF-8 encoding (indicated by entry's general purpose flag).
      Throws:
        `ZipException` - if a ZIP format error has occurred
        `IOException` - if an I/O error has occurred
        `SecurityException` - if a security manager exists and its `checkRead` method doesn't allow read access to the file
      Since:
        1.7
      See Also:
        `SecurityManager.checkRead(java.lang.String)`

    - #### ZipFile

          public ZipFile(File file,
                         Charset charset)
                  throws IOException

      Opens a ZIP file for reading given the specified File object.
      Parameters:
        `file` - the ZIP file to be opened for reading
        `charset` - The charset to be used to decode the ZIP entry name and comment (ignored if the language encoding bit of the ZIP entry's general purpose bit flag is set).
      Throws:
        `ZipException` - if a ZIP format error has occurred
        `IOException` - if an I/O error has occurred
      Since:
        1.7

  - ### Method Detail

    - #### getComment

          public String getComment()

      Returns the zip file comment, or null if none.
      Returns:
        the comment string for the zip file, or null if none
      Throws:
        `IllegalStateException` - if the zip file has been closed Since 1.7

    - #### getEntry

          public ZipEntry getEntry(String name)

      Returns the zip file entry for the specified name, or null if not found.
      Parameters:
        `name` - the name of the entry
      Returns:
        the zip file entry, or null if not found
      Throws:
        `IllegalStateException` - if the zip file has been closed

    - #### getInputStream

          public InputStream getInputStream(ZipEntry entry)
                                     throws IOException

      Returns an input stream for reading the contents of the specified zip file entry.

      Closing this ZIP file will, in turn, close all input streams that have been returned by invocations of this method.

      Parameters:
        `entry` - the zip file entry
      Returns:
        the input stream for reading the contents of the specified zip file entry.
      Throws:
        `ZipException` - if a ZIP format error has occurred
        `IOException` - if an I/O error has occurred
        `IllegalStateException` - if the zip file has been closed

    - #### getName

          public String getName()

      Returns the path name of the ZIP file.
      Returns:
        the path name of the ZIP file

    - #### entries

          public Enumeration<? extends ZipEntry> entries()

      Returns an enumeration of the ZIP file entries.
      Returns:
        an enumeration of the ZIP file entries
      Throws:
        `IllegalStateException` - if the zip file has been closed

    - #### stream

          public Stream<? extends ZipEntry> stream()

      Return an ordered `Stream` over the ZIP file entries. Entries appear in the `Stream` in the order they appear in the central directory of the ZIP file.
      Returns:
        an ordered `Stream` of entries in this ZIP file
      Throws:
        `IllegalStateException` - if the zip file has been closed
      Since:
        1.8

    - #### size

          public int size()

      Returns the number of entries in the ZIP file.
      Returns:
        the number of entries in the ZIP file
      Throws:
        `IllegalStateException` - if the zip file has been closed

    - #### close

          public void close()
                     throws IOException

      Closes the ZIP file.

      Closing this ZIP file will close all of the input streams previously returned by invocations of the `getInputStream` method.

      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Throws:
        `IOException` - if an I/O error has occurred

    - #### finalize

          protected void finalize()
                           throws IOException

      Ensures that the system resources held by this ZipFile object are released when there are no more references to it.

      Since the time when GC would invoke this method is undetermined, it is strongly recommended that applications invoke the `close` method as soon they have finished accessing this `ZipFile`. This will prevent holding up system resources for an undetermined length of time.

      Overrides:
        `finalize` in class `Object`
      Throws:
        `IOException` - if an I/O error has occurred
      See Also:
        `close()`

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