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zip files support for JDK application: split, zip64, encryption, streaming

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oleg-cherednik/zip4jvm

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zip4jvm - a java library for working with zip files

Features

  • Add regular files or directories to new or existed zip archive;
  • Extract regular files or directories from zip archive;
  • Encryption algorithms support:
  • Compression support:
  • Individual settings for each zip entry (i.e. some of files can be encrypted, and some - not);
  • Streaming support for adding and extracting;
  • Read/Write password protected Zip files and streams;
  • ZIP64 format support;
  • Multi-volume zip archive support:
    • PKWare, i.e.filename.zip,filename.z01,filename.z02
    • 7-Zip, i.e.filename.zip.001,filename.zip.002,filename.zip.003 (read-only)
  • Unicode for comments and file names.

Gradle

compile 'ru.oleg-cherednik.zip4jvm:zip4jvm:1.11'

Maven

<dependency>    <groupId>ru.oleg-cherednik.zip4jvm</groupId>    <artifactId>zip4jvm</artifactId>    <version>1.11</version></dependency>

Usage

To simplify usage ofzip4jvm, there're following classes:

  • ZipIt - add files to archive;
  • UnzipIt - extract files from archive;
  • ZipMisc - other zip file activities;
  • ZipInfo - zip file information and diagnostics.

ZipIt

Regular files and directories can be represented asPath

Create (or open existed) zip archive and add regular file/cars/bentley-continental.jpg
Pathzip =Paths.get("filename.zip");Pathfile =Path.get("/cars/bentley-continental.jpg")ZipIt.zip(zip).add(file);
/-|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|    |-- honda-cbr600rr.jpg|-- saint-petersburg.jpg
filename.zip|-- bentley-continental.jpg

Note: regular file is added to the root of the zip archive.

Create (or open existed) zip archive and add directory/cars
Pathzip =Paths.get("filename.zip");Pathdir =Path.get("/cars");ZipIt.zip(zip).add(dir);
/-|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|    |-- honda-cbr600rr.jpg|-- saint-petersburg.jpg
filename.zip|-- cars     |-- bentley-continental.jpg     |-- ferrari-458-italia.jpg     |-- wiesmann-gt-mf5.jpg

Note: directory is added to the root of the zip archive keeping the initial structure.

Create (or open existed) zip archive and add some regular files and/or directories
Pathzip =Paths.get("filename.zip");Collection<Path>paths =Arrays.asList(Paths.get("/bikes/ducati-panigale-1199.jpg"),Paths.get("/bikes/honda-cbr600rr.jpg"),Paths.get("/cars"),Paths.get("/saint-petersburg.jpg"));ZipIt.zip(zip).add(paths);
/-|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|    |-- honda-cbr600rr.jpg|-- saint-petersburg.jpg
filename.zip|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- ducati-panigale-1199.jpg|-- honda-cbr600rr.jpg|-- saint-petersburg.jpg

Note: each regular file from the list is added to the root of the zip archive.

Note: each directory from the list is added to the root of the zip archive keeping the initial structure.

Regular files and empty directories are available asInputStream

Create (or open existed) zip archive and add input streams content as regular files
Pathzip =Zip4jvmSuite.subDirNameAsMethodName(rootDir).resolve("filename.zip");try (ZipFile.WriterzipFile =ZipIt.zip(zip).open()) {zipFile.add(ZipFile.Entry.builder()                             .inputStreamSupplier(() ->newFileInputStream("/cars/bentley-continental.jpg"))                             .fileName("my_cars/bentley-continental.jpg")                             .uncompressedSize(Files.size(Paths.get("/cars/bentley-continental.jpg"))).build());zipFile.add(ZipFile.Entry.builder()                             .inputStreamSupplier(() ->newFileInputStream("/bikes/kawasaki-ninja-300.jpg"))                             .fileName("my_bikes/kawasaki.jpg")                             .uncompressedSize(Files.size(Paths.get("/bikes/kawasaki-ninja-300.jpg"))).build());}
/-|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|    |-- honda-cbr600rr.jpg|-- saint-petersburg.jpg
filename.zip|-- my_cars|    |-- bentley-continental.jpg|-- my_bikes|    |-- kawasaki.jpg

Note: each entry is treated as separate input stream of the regular file.

UnzipIt

Regular files and directories toPath destination

Extract all entries into given directory
Pathzip =Paths.get("filename.zip");PathdestDir =Paths.get("/filename_content");UnzipIt.zip(zip).destDir(destDir).extract();
filename.zip|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|-- saint-petersburg.jpg
/filename_content |-- cars |-- cars |    |-- bentley-continental.jpg |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg |-- bikes |    |-- ducati-panigale-1199.jpg |    |-- kawasaki-ninja-300.jpg |-- saint-petersburg.jpg

Note: all entries (i.e. regular files and empty directories) are added to the destinationdirectory keeping the initial structure.

Extract regular file's entry into given directory
Pathzip =Paths.get("filename.zip");PathdestDir =Paths.get("/filename_content");UnzipIt.zip(zip).destDir(destDir).extract("/cars/bentley-continental.jpg");
filename.zip|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|-- saint-petersburg.jpg
/filename_content |-- bentley-continental.jpg

Note: regular file's entry is added to the root of the destination directory.

Extract directory entries into given directory
Pathzip =Paths.get("filename.zip");PathdestDir =Paths.get("/filename_content");UnzipIt.zip(zip).destDir(destDir).extract("cars");
filename.zip|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|-- saint-petersburg.jpg
/filename_content |-- cars |    |-- bentley-continental.jpg |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg

Note: extract all entries belong to the given directory; content of these entries is added tothe destination directory keeping the initial structure.

Extract some entries into given directory
Pathzip =Paths.get("filename.zip");PathdestDir =Paths.get("/filename_content");Collection<Path>fileNames =Arrays.asList("cars","bikes/ducati-panigale-1199.jpg","saint-petersburg.jpg");UnzipIt.zip(zip).destDir(destDir).extract(fileNames);
filename.zip|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|-- saint-petersburg.jpg
/filename_content |-- cars |    |-- bentley-continental.jpg |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg |-- ducati-panigale-1199.jpg |-- saint-petersburg.jpg

Note: directory is extracting keeping the initial structure; regular file is extracted into root ofdestination directory

Regular files asInputStream source

Get input stream for regular file's entry
Pathzip =Paths.get("filename.zip");PathdestFile =Paths.get("/filename_content/bentley.jpg");try (InputStreamin =UnzipIt.zip(zip).stream("/cars/bentley-continental.jpg");OutputStreamout =newFileOutputStream(destFile.toFile())) {IOUtils.copyLarge(in,out);}
filename.zip|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|-- saint-petersburg.jpg
/filename_content |-- bentley-continental.jpg

Note: Input stream for regular file's entry should be correctly closed to flush all data

Use password to unzip

For all unzip operationpassword provider could be optionally set. It could be either single password orpassword provider withfileName of the entry as a key.

Unzip with single password for entries

char[]password ="1".toCharArray();PathdestDir =Paths.get("/filename_content");List<String>fileNames =Arrays.asList("cars","bikes/ducati-panigale-1199.jpg","saint-petersburg.jpg");UnzipIt.zip(zip).destDir(destDir).password(password).extract(fileNames);
filename.zip  --> password: 1|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|-- saint-petersburg.jpg
/filename_content |-- cars |    |-- bentley-continental.jpg |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg |-- ducati-panigale-1199.jpg |-- saint-petersburg.jpg

Or separate password for each entry. The key is thefileName of the entry:

Unzip with separate password for each entry

Pathzip =Paths.get("filename.zip");PathdestFile =Paths.get("filename_content/bentley.jpg");Function<String,char[]>passwordProvider =fileName -> {if (fileName.startsWith("cars/"))return"1".toCharArray();if (fileName.startsWith("bikes/ducati-panigale-1199.jpg"))return"2".toCharArray();if (fileName.startsWith("saint-petersburg.jpg"))return"3".toCharArray();returnnull;};UnzipSettingssettings =UnzipSettings.builder().password(passwordProvider).build();List<Path>fileNames =Arrays.asList("cars","bikes/ducati-panigale-1199.jpg","saint-petersburg.jpg");UnzipIt.zip(zip).destDir(destDir).settings(settings).extract(fileNames);
filename.zip |-- cars |    |-- bentley-continental.jpg   --> password: 1 |    |-- ferrari-458-italia.jpg    --> password: 1 |    |-- wiesmann-gt-mf5.jpg       --> password: 1 |-- bikes |    |-- ducati-panigale-1199.jpg  --> password: 2 |    |-- kawasaki-ninja-300.jpg |-- saint-petersburg.jpg           --> password: 3
/filename_content |-- cars |    |-- bentley-continental.jpg |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg |-- ducati-panigale-1199.jpg |-- saint-petersburg.jpg

ZipMisc

Modify zip archive comment

Pathzip =Paths.get("filename.zip");ZipMisczipFile =ZipMisc.zip(zip);zipFile.getComment();// get current comment (null if it's not set)zipFile.setComment("comment");// set comment to 'comment'zipFile.setComment(null);// remove comment

Get all entries

Pathzip =Paths.get("filename.zip");ZipMisczipFile =ZipMisc.zip(zip);List<ZipFile.Entry>entires =zipFile.getEntries().collect(Collectors.toList());/* * [entryNames] * cars/bentley-continental.jpg * cars/ferrari-458-italia.jpg * cars/wiesmann-gt-mf5.jpg * bikes/ducati-panigale-1199.jpg * bikes/kawasaki-ninja-300.jpg * saint-petersburg.jpg */
filename.zip|-- cars|    |-- bentley-continental.jpg|    |-- ferrari-458-italia.jpg|    |-- wiesmann-gt-mf5.jpg|-- bikes|    |-- ducati-panigale-1199.jpg|    |-- kawasaki-ninja-300.jpg|-- saint-petersburg.jpg

Note:zipFile.getEntries() retrievesStream with immutableZupFile.Entry objects represent all entries in zip archive

Remove entry by name

Pathzip =Paths.get("filename.zip");ZipMisczipFile =ZipMisc.zip(zip);zipFile.removeEntryByName("cars/bentley-continental.jpg");
filename.zip (before) |-- cars |    |-- bentley-continental.jpg |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg |-- bikes |    |-- ducati-panigale-1199.jpg |    |-- kawasaki-ninja-300.jpg |-- saint-petersburg.jpg
filename.zip (after) |-- cars |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg |-- bikes |    |-- ducati-panigale-1199.jpg |    |-- kawasaki-ninja-300.jpg |-- saint-petersburg.jpg

Note: exactly one entry will be removed in case of entry with exact this name exists

Remove some entries by name

Pathzip =Paths.get("filename.zip");ZipMisczipFile =ZipMisc.zip(zip);Collection<String>entryNames =Arrays.asList("cars/ferrari-458-italia.jpg","bikes/ducati-panigale-1199.jpg");zipFile.removeEntryByName(entryNames);
filename.zip (before) |-- cars |    |-- bentley-continental.jpg |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg |-- bikes |    |-- ducati-panigale-1199.jpg |    |-- kawasaki-ninja-300.jpg |-- saint-petersburg.jpg
filename.zip (after) |-- cars |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg |-- bikes |    |-- kawasaki-ninja-300.jpg |-- saint-petersburg.jpg

Remove entry by name prefix

Pathzip =Paths.get("filename.zip");ZipMisczipFile =ZipMisc.zip(zip);zipFile.removeEntryByNamePrefix("cars")
filename.zip (before) |-- cars |    |-- bentley-continental.jpg |    |-- ferrari-458-italia.jpg |    |-- wiesmann-gt-mf5.jpg |-- bikes |    |-- ducati-panigale-1199.jpg |    |-- kawasaki-ninja-300.jpg |-- saint-petersburg.jpg
filename.zip (after) |-- bikes |    |-- ducati-panigale-1199.jpg |    |-- kawasaki-ninja-300.jpg |-- saint-petersburg.jpg

Note: multiple entries could be removed

Check whether zip archive split or not

Pathzip =Paths.get("filename.zip");ZipMisczipFile =ZipMisc.zip(zip);booleansplit =zipFile.isSplit();

Merge split archive into solid one

PathzipSrc =Paths.get("split.zip");Pathzip =Paths.get("filename.zip");ZipMisczipFile =ZipMisc.zip(zipSrc);zipFile.merge(zip);
/- (before)|-- split.z01|-- split.z02|-- split.z03|-- split.zip
/- (after)|-- filename.zip

ZipInfo

Print content of zip file into console

Pathzip =Paths.get("filename.zip");ZipInfo.zip(zip).printShortInfo();
filename.zip |-- cars |    |-- bentley-continental.jpg |-- saint-petersburg.jpg
--- console output ---(PK0506) End of Central directory record========================================   - location:                                     2365537 (0x00241861) bytes   - size:                                         22 bytes   part number of this part (0000):                1   part number of start of central dir (0000):     1   number of entries in central dir in this part:  3   total number of entries in central dir:         3   size of central dir:                            299 (0x0000012B) bytes   relative offset of central dir:                 2365238 (0x00241736) bytes   zipfile comment length:                         0 bytes(PK0102) Central directory==========================   - location:                                     2365238 (0x00241736) bytes   - size:                                         303 bytes   total entries:                                  3#1 (PK0102) [UTF-8] cars/-------------------------   - location:                                     2365238 (0x00241736) bytes   - size:                                         87 bytes   part number of this part (0000):                1   relative offset of local header:                0 (0x00000000) bytes   version made by operating system (00):          MS-DOS, OS/2, NT FAT   version made by zip software (31):              3.1   operat. system version needed to extract (00):  MS-DOS, OS/2, NT FAT   unzip software version needed to extract (10):  1.0   general purpose bit flag (0x0000) (bit 15..0):  0000.0000 0000.0000     file security status  (bit 0):                not encrypted     data descriptor       (bit 3):                no     strong encryption     (bit 6):                no     UTF-8 names          (bit 11):                no   compression method (00):                        none (stored)   file last modified on (0x5024 0x7EC0):          2020-01-04 15:54:00   32-bit CRC value:                               0x00000000   compressed size:                                0 bytes   uncompressed size:                              0 bytes   length of filename:                             5                                                   UTF-8   63 61 72 73 2F                                  cars/   length of file comment:                         0 bytes   internal file attributes:                       0x0000     apparent file type:                           binary   external file attributes:                       0x00000010     WINDOWS   (0x10):                             dir     POSIX (0x000000):                             none   extra field:                                    2365289 (0x00241769) bytes     - size:                                       36 bytes (1 record)   (0x000A) NTFS Timestamp:                        2365289 (0x00241769) bytes     - size:                                       36 bytes     - total tags:                                 1     (0x0001) Tag1:                                24 bytes       Creation Date:                              2020-01-04 12:50:54       Last Modified Date:                         2020-01-04 12:54:00       Last Accessed Date:                         2020-01-04 12:54:00#2 (PK0102) [UTF-8] cars/bentley-continental.jpg------------------------------------------------   - location:                                     2365325 (0x0024178D) bytes   - size:                                         110 bytes   part number of this part (0000):                1   relative offset of local header:                35 (0x00000023) bytes   version made by operating system (00):          MS-DOS, OS/2, NT FAT   version made by zip software (31):              3.1   operat. system version needed to extract (00):  MS-DOS, OS/2, NT FAT   unzip software version needed to extract (20):  2.0   general purpose bit flag (0x0000) (bit 15..0):  0000.0000 0000.0000     file security status  (bit 0):                not encrypted     data descriptor       (bit 3):                no     strong encryption     (bit 6):                no     UTF-8 names          (bit 11):                no   compression method (08):                        deflate     compression sub-type (deflation):             normal   file last modified on (0x4F24 0x3D6D):          2019-09-04 07:43:26   32-bit CRC value:                               0x71797968   compressed size:                                1380544 bytes   uncompressed size:                              1395362 bytes   length of filename:                             28                                                   UTF-8   63 61 72 73 2F 62 65 6E 74 6C 65 79 2D 63 6F 6E cars/bentley-con   74 69 6E 65 6E 74 61 6C 2E 6A 70 67             tinental.jpg   length of file comment:                         0 bytes   internal file attributes:                       0x0000     apparent file type:                           binary   external file attributes:                       0x00000020     WINDOWS   (0x20):                             arc     POSIX (0x000000):                             none   extra field:                                    2365399 (0x002417D7) bytes     - size:                                       36 bytes (1 record)   (0x000A) NTFS Timestamp:                        2365399 (0x002417D7) bytes     - size:                                       36 bytes     - total tags:                                 1     (0x0001) Tag1:                                24 bytes       Creation Date:                              2020-01-04 12:50:54       Last Modified Date:                         2019-09-04 04:43:27       Last Accessed Date:                         2020-01-04 12:50:54#3 (PK0102) [UTF-8] saint-petersburg.jpg----------------------------------------   - location:                                     2365435 (0x002417FB) bytes   - size:                                         102 bytes   part number of this part (0000):                1   relative offset of local header:                1380637 (0x0015111D) bytes   version made by operating system (00):          MS-DOS, OS/2, NT FAT   version made by zip software (31):              3.1   operat. system version needed to extract (00):  MS-DOS, OS/2, NT FAT   unzip software version needed to extract (20):  2.0   general purpose bit flag (0x0000) (bit 15..0):  0000.0000 0000.0000     file security status  (bit 0):                not encrypted     data descriptor       (bit 3):                no     strong encryption     (bit 6):                no     UTF-8 names          (bit 11):                no   compression method (08):                        deflate     compression sub-type (deflation):             normal   file last modified on (0x4F24 0x3D6D):          2019-09-04 07:43:26   32-bit CRC value:                               0x5F2EEF84   compressed size:                                984551 bytes   uncompressed size:                              1074836 bytes   length of filename:                             20                                                   UTF-8   73 61 69 6E 74 2D 70 65 74 65 72 73 62 75 72 67 saint-petersburg   2E 6A 70 67                                     .jpg   length of file comment:                         0 bytes   internal file attributes:                       0x0000     apparent file type:                           binary   external file attributes:                       0x00000020     WINDOWS   (0x20):                             arc     POSIX (0x000000):                             none   extra field:                                    2365501 (0x0024183D) bytes     - size:                                       36 bytes (1 record)   (0x000A) NTFS Timestamp:                        2365501 (0x0024183D) bytes     - size:                                       36 bytes     - total tags:                                 1     (0x0001) Tag1:                                24 bytes       Creation Date:                              2020-01-04 12:50:54       Last Modified Date:                         2019-09-04 04:43:27       Last Accessed Date:                         2020-01-04 12:50:54(PK0304) ZIP entries====================   total entries:                                  3#1 (PK0304) [UTF-8] cars/-------------------------   - location:                                     0 (0x00000000) bytes   - size:                                         35 bytes   operat. system version needed to extract (00):  MS-DOS, OS/2, NT FAT   unzip software version needed to extract (10):  1.0   general purpose bit flag (0x0000) (bit 15..0):  0000.0000 0000.0000     file security status  (bit 0):                not encrypted     data descriptor       (bit 3):                no     strong encryption     (bit 6):                no     UTF-8 names          (bit 11):                no   compression method (00):                        none (stored)   file last modified on (0x5024 0x7EC0):          2020-01-04 15:54:00   32-bit CRC value:                               0x00000000   compressed size:                                0 bytes   uncompressed size:                              0 bytes   length of filename:                             5                                                   UTF-8   63 61 72 73 2F                                  cars/#2 (PK0304) [UTF-8] cars/bentley-continental.jpg------------------------------------------------   - location:                                     35 (0x00000023) bytes   - size:                                         58 bytes   operat. system version needed to extract (00):  MS-DOS, OS/2, NT FAT   unzip software version needed to extract (20):  2.0   general purpose bit flag (0x0000) (bit 15..0):  0000.0000 0000.0000     file security status  (bit 0):                not encrypted     data descriptor       (bit 3):                no     strong encryption     (bit 6):                no     UTF-8 names          (bit 11):                no   compression method (08):                        deflate     compression sub-type (deflation):             normal   file last modified on (0x4F24 0x3D6D):          2019-09-04 07:43:26   32-bit CRC value:                               0x71797968   compressed size:                                1380544 bytes   uncompressed size:                              1395362 bytes   length of filename:                             28                                                   UTF-8   63 61 72 73 2F 62 65 6E 74 6C 65 79 2D 63 6F 6E cars/bentley-con   74 69 6E 65 6E 74 61 6C 2E 6A 70 67             tinental.jpg#3 (PK0304) [UTF-8] saint-petersburg.jpg----------------------------------------   - location:                                     1380637 (0x0015111D) bytes   - size:                                         50 bytes   operat. system version needed to extract (00):  MS-DOS, OS/2, NT FAT   unzip software version needed to extract (20):  2.0   general purpose bit flag (0x0000) (bit 15..0):  0000.0000 0000.0000     file security status  (bit 0):                not encrypted     data descriptor       (bit 3):                no     strong encryption     (bit 6):                no     UTF-8 names          (bit 11):                no   compression method (08):                        deflate     compression sub-type (deflation):             normal   file last modified on (0x4F24 0x3D6D):          2019-09-04 07:43:26   32-bit CRC value:                               0x5F2EEF84   compressed size:                                984551 bytes   uncompressed size:                              1074836 bytes   length of filename:                             20                                                   UTF-8   73 61 69 6E 74 2D 70 65 74 65 72 73 62 75 72 67 saint-petersburg   2E 6A 70 67                                     .jpg

Note: additional methodZipInfo.printShortInfo(PrintStream) could be used to print this info to requiredPrintStream

Decompose zip file intoPath destination

Pathzip =Paths.get("filename.zip");PathdestDir =Paths.get("/filename_decompose");ZipInfo.zip(zip).decompose(destDir);
filename.zip |-- cars |    |-- bentley-continental.jpg |-- saint-petersburg.jpg
/filename_content |-- central_directory |    |-- #1 - cars |    |    |-- extra_fields |    |    |    |-- (0x000A)_NTFS_Timestamp.txt |    |    |    |-- (0x000A)_NTFS_Timestamp.data |    |    |-- file_header.txt |    |    |-- file_header.data |    |-- #2 - cars_-_bentley-continental.jpg |    |    |-- extra_fields |    |    |    |-- (0x000A)_NTFS_Timestamp.txt |    |    |    |-- (0x000A)_NTFS_Timestamp.data |    |    |-- file_header.txt |    |    |-- file_header.data |    |-- #3 - saint-petersburg.jpg |    |    |-- extra_fields |    |    |    |-- (0x000A)_NTFS_Timestamp.txt |    |    |    |-- (0x000A)_NTFS_Timestamp.data |    |    |-- file_header.txt |    |    |-- file_header.data |    |-- central_directory.txt |-- entries |    |-- #1 - cars |    |    |-- local_file_header.txt |    |    |-- local_file_header.data |    |-- #2 - cars_-_bentley-continental.jpg |    |    |-- local_file_header.txt |    |    |-- local_file_header.data |    |-- #3 - saint-petersburg.jpg |    |    |-- file_header.txt |    |    |-- file_header.data |-- end_central_directory.txt |-- end_central_directory.data

Model

Zip settings:ZipSettings

All zip operations includeZipSettings.Default settings isused when it's not explicitly set. Settings contains zip archive scope properties as well asprovider for entry specific settings. The key for entry settings isfileName.

Note: user should not worry about directory marker/, becausezip4jvm does not supportduplicated file names and it's impossible to have same file name for file and directory.

  • splitSize - size of each part in split archive
    • -1 - no split or solid archive
    • min size -64Kb i.e.65_536
    • min size -~2Gb i.e.2_147_483_647
  • comment - global archive comment
    • no comment -null orempty string
    • max length -65_535 symbols
  • zip64 - usetrue or notfalse zip64 format for global zip structure
    • Note:zip64 is switched on automatically if needed
    • Note: it does not mean that entry structure is inzip64 format as well
  • entrySettingsProvider - file name base provider of settings for entry
    • Note: each entry could have different settings

Zip settings defaults

  • splitSize --1, i.e. off or solid archive
  • comment -null, i.e. no comment
  • zip64 -false, i.e. standard format for global zip structure
  • entrySettingsProvider -default, i.e. all entries has samedefault entry settings

Zip entry settings:ZipEntrySettings

Each entry has it's own settings. These settings could be different for every entry. If this settingsare not explicitly set, thendefault entry settings are used for all added entries.

  • compression - compression algorithm
    • store - no compression
    • deflate - useDEFLATE compression algorithm
    • enhanced_deflate - useENHANCED DEFLATE compression algorithm
    • bzip2 - useBZIP2 compression algorithm
    • lzma - useLZMA compression algorithm
  • compressionLevel - compression level
    • super_fastfastnormalmaximum
  • encryption - encryption algorithm
    • off - not encryption
    • pkware -PKWare encryption algorithm
    • aes_128aes_192aes_256 -AESencryption algorithm with given128192255 bits key strength
  • comment - comment for entry
    • no comment -null orempty string
    • max length -65_535 symbols
  • zip64 - usetrue orfalse zip64 format for global zip structure
    • Note:zip64 is switched on automatically if needed
  • utf8 -true useUTF-8 charset for file name and commentinstead ofIBM-437 whenfalse

Zip entry settings defaults

  • compression -deflate
  • compressionLevel -normal
  • encryption -off, i.e. no encryption
  • comment -null, i.e. no comment
  • zip64 -false, i.e. standard format for entry structure
  • utf8 -true, i.e. entry's name and comment are stored usingUTF-8 charset
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