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java.util.zip
Provides classes for reading and writing the standard ZIP and GZIP file
formats. Also includes classes for compressing and decompressing data using
the DEFLATE compression algorithm, which is used by the ZIP and GZIP file
formats. Additionally, there are utility classes for computing the CRC-32,
CRC-32C and Adler-32 checksums of arbitrary input streams.
Package Specification
Interfaces
| Checksum |
An interface representing a data checksum.
|
Classes
| Adler32 |
A class that can be used to compute the Adler-32 checksum of a data
stream.
|
| CheckedInputStream |
An input stream that also maintains a checksum of the data being read.
|
| CheckedOutputStream |
An output stream that also maintains a checksum of the data being
written.
|
| CRC32 |
A class that can be used to compute the CRC-32 of a data stream.
|
| CRC32C |
A class that can be used to compute the CRC-32C of a data stream.
|
| Deflater |
This class provides support for general purpose compression using the
popular ZLIB compression library.
|
| DeflaterInputStream |
Implements an input stream filter for compressing data in the "deflate"
compression format.
|
| DeflaterOutputStream |
This class implements an output stream filter for compressing data in
the "deflate" compression format.
|
| GZIPInputStream |
This class implements a stream filter for reading compressed data in
the GZIP file format.
|
| GZIPOutputStream |
This class implements a stream filter for writing compressed data in
the GZIP file format.
|
| Inflater |
This class provides support for general purpose decompression using the
popular ZLIB compression library.
|
| InflaterInputStream |
This class implements a stream filter for uncompressing data in the
"deflate" compression format.
|
| InflaterOutputStream |
Implements an output stream filter for uncompressing data stored in the
"deflate" compression format.
|
| ZipEntry |
This class is used to represent a ZIP file entry.
|
| ZipFile |
This class is used to read entries from a zip file.
|
| ZipInputStream |
This class implements an input stream filter for reading files in the
ZIP file format.
|
| ZipOutputStream |
This class implements an output stream filter for writing files in the
ZIP file format.
|
Exceptions
Errors
| ZipError |
Signals that an unrecoverable error has occurred.
|
Interfaces
Classes
Exceptions
Errors
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10 UTC."],[],[],null,["# java.util.zip\n\nAdded in [API level 1](/guide/topics/manifest/uses-sdk-element#ApiLevels) \n\njava.util.zip\n=============\n\nProvides classes for reading and writing the standard ZIP and GZIP file formats. Also includes classes for compressing and decompressing data using the DEFLATE compression algorithm, which is used by the ZIP and GZIP file formats. Additionally, there are utility classes for computing the CRC-32, CRC-32C and Adler-32 checksums of arbitrary input streams.\n\nPackage Specification\n---------------------\n\n- [Info-ZIP Application Note 970311](http://www.info-zip.org/doc/appnote-19970311-iz.zip) - a detailed description of the Info-ZIP format upon which the `java.util.zip` classes are based.\n- An implementation may optionally support the\n ZIP64(tm) format extensions defined by the [PKWARE ZIP File Format Specification](http://www.pkware.com/documents/casestudies/APPNOTE.TXT). The ZIP64(tm) format extensions are used to overcome the size limitations of the original ZIP format.\n- APPENDIX D of [PKWARE ZIP File Format Specification](http://www.pkware.com/documents/casestudies/APPNOTE.TXT) - Language Encoding Flag to encode ZIP entry filename and comment fields using UTF-8.\n- [ZLIB Compressed Data Format Specification version 3.3](http://www.ietf.org/rfc/rfc1950.txt) [(pdf)](http://www.ietf.org/rfc/rfc1950.txt.pdf) (RFC 1950)\n- [DEFLATE Compressed Data Format Specification version 1.3](http://www.ietf.org/rfc/rfc1951.txt) [(pdf)](http://www.ietf.org/rfc/rfc1951.txt.pdf) (RFC 1951)\n- [GZIP file format specification version 4.3](http://www.ietf.org/rfc/rfc1952.txt) [(pdf)](http://www.ietf.org/rfc/rfc1952.txt.pdf) (RFC 1952)\n- CRC-32 checksum is described in RFC 1952 (above)\n- CRC-32C checksum is described in [Internet Small\n Computer Systems Interface (iSCSI)](http://www.ietf.org/rfc/rfc3720.txt) [(pdf)](http://www.ietf.org/rfc/rfc3720.txt.pdf) (RFC 3720)\n- Adler-32 checksum is described in RFC 1950 (above)\n\nInterfaces\n----------\n\n|-----------------------------------------------|--------------------------------------------|\n| [Checksum](/reference/java/util/zip/Checksum) | An interface representing a data checksum. |\n\nClasses\n-------\n\n|-----------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------|\n| [Adler32](/reference/java/util/zip/Adler32) | A class that can be used to compute the Adler-32 checksum of a data stream. |\n| [CheckedInputStream](/reference/java/util/zip/CheckedInputStream) | An input stream that also maintains a checksum of the data being read. |\n| [CheckedOutputStream](/reference/java/util/zip/CheckedOutputStream) | An output stream that also maintains a checksum of the data being written. |\n| [CRC32](/reference/java/util/zip/CRC32) | A class that can be used to compute the CRC-32 of a data stream. |\n| [CRC32C](/reference/java/util/zip/CRC32C) | A class that can be used to compute the CRC-32C of a data stream. |\n| [Deflater](/reference/java/util/zip/Deflater) | This class provides support for general purpose compression using the popular ZLIB compression library. |\n| [DeflaterInputStream](/reference/java/util/zip/DeflaterInputStream) | Implements an input stream filter for compressing data in the \"deflate\" compression format. |\n| [DeflaterOutputStream](/reference/java/util/zip/DeflaterOutputStream) | This class implements an output stream filter for compressing data in the \"deflate\" compression format. |\n| [GZIPInputStream](/reference/java/util/zip/GZIPInputStream) | This class implements a stream filter for reading compressed data in the GZIP file format. |\n| [GZIPOutputStream](/reference/java/util/zip/GZIPOutputStream) | This class implements a stream filter for writing compressed data in the GZIP file format. |\n| [Inflater](/reference/java/util/zip/Inflater) | This class provides support for general purpose decompression using the popular ZLIB compression library. |\n| [InflaterInputStream](/reference/java/util/zip/InflaterInputStream) | This class implements a stream filter for uncompressing data in the \"deflate\" compression format. |\n| [InflaterOutputStream](/reference/java/util/zip/InflaterOutputStream) | Implements an output stream filter for uncompressing data stored in the \"deflate\" compression format. |\n| [ZipEntry](/reference/java/util/zip/ZipEntry) | This class is used to represent a ZIP file entry. |\n| [ZipFile](/reference/java/util/zip/ZipFile) | This class is used to read entries from a zip file. |\n| [ZipInputStream](/reference/java/util/zip/ZipInputStream) | This class implements an input stream filter for reading files in the ZIP file format. |\n| [ZipOutputStream](/reference/java/util/zip/ZipOutputStream) | This class implements an output stream filter for writing files in the ZIP file format. |\n\nExceptions\n----------\n\n|---------------------------------------------------------------------|---------------------------------------------------------|\n| [DataFormatException](/reference/java/util/zip/DataFormatException) | Signals that a data format error has occurred. |\n| [ZipException](/reference/java/util/zip/ZipException) | Signals that a Zip exception of some sort has occurred. |\n\nErrors\n------\n\n|-----------------------------------------------|---------------------------------------------------|\n| [ZipError](/reference/java/util/zip/ZipError) | Signals that an unrecoverable error has occurred. |\n\n-\n\n Interfaces\n ----------\n\n - [Checksum](/reference/java/util/zip/Checksum)\n-\n\n Classes\n -------\n\n - [Adler32](/reference/java/util/zip/Adler32)\n - [CheckedInputStream](/reference/java/util/zip/CheckedInputStream)\n - [CheckedOutputStream](/reference/java/util/zip/CheckedOutputStream)\n - [CRC32](/reference/java/util/zip/CRC32)\n - [CRC32C](/reference/java/util/zip/CRC32C)\n - [Deflater](/reference/java/util/zip/Deflater)\n - [DeflaterInputStream](/reference/java/util/zip/DeflaterInputStream)\n - [DeflaterOutputStream](/reference/java/util/zip/DeflaterOutputStream)\n - [GZIPInputStream](/reference/java/util/zip/GZIPInputStream)\n - [GZIPOutputStream](/reference/java/util/zip/GZIPOutputStream)\n - [Inflater](/reference/java/util/zip/Inflater)\n - [InflaterInputStream](/reference/java/util/zip/InflaterInputStream)\n - [InflaterOutputStream](/reference/java/util/zip/InflaterOutputStream)\n - [ZipEntry](/reference/java/util/zip/ZipEntry)\n - [ZipFile](/reference/java/util/zip/ZipFile)\n - [ZipInputStream](/reference/java/util/zip/ZipInputStream)\n - [ZipOutputStream](/reference/java/util/zip/ZipOutputStream)\n-\n\n Exceptions\n ----------\n\n - [DataFormatException](/reference/java/util/zip/DataFormatException)\n - [ZipException](/reference/java/util/zip/ZipException)\n-\n\n Errors\n ------\n\n - [ZipError](/reference/java/util/zip/ZipError)"]]
