how to zip a folder itself using java

Question

Suppose I have the following directory structure     D  reports january    Inside january there are suppose two excel files say A xls and B xls  There are many places where it has been written about how to zip files using java util zip  But I want to zip the january folder itself inside reports folder so that both january and january zip will be present inside reports   That means when I unzip the january zip file I should get the january folder      Can anyone please provide me the code to do this using java util zip  Please let me know whether this can be more easily done by using other libraries     Thanks a lot

User · Answer

Have you tried Zeroturnaround Zip library? It's really neat! Zip a folder is just a one liner:

ZipUtil.pack(new File("D:\\reports\\january\\"), new File("D:\\reports\\january.zip"));

(thanks to Oleg Šelajev for the example)

User · Answer

Using zip4j you can simply do this  ZipFile zipfile   new ZipFile new File  D   reports  january  filename zip     zipfile addFolder new File  D   reports  january         It will archive your folder and everything in it   Use the  extractAll method to get it all out   zipfile extractAll  D   destination directory

User · Answer

Try this    import java io File    import java io FileInputStream    import java io FileOutputStream    import java util zip ZipEntry    import java util zip ZipOutputStream      public class Zip    public static void main String   a  throws Exception        zipFolder  D   reports  january    D   reports  january zip            static public void zipFolder String srcFolder  String destZipFile  throws Exception       ZipOutputStream zip   null      FileOutputStream fileWriter   null      fileWriter   new FileOutputStream destZipFile       zip   new ZipOutputStream fileWriter       addFolderToZip     srcFolder  zip       zip flush        zip close          static private void addFileToZip String path  String srcFile  ZipOutputStream zip        throws Exception       File folder   new File srcFile       if  folder isDirectory            addFolderToZip path  srcFile  zip         else         byte   buf   new byte 1024         int len        FileInputStream in   new FileInputStream srcFile         zip putNextEntry new ZipEntry path         folder getName            while   len   in read buf    gt  0            zip write buf  0  len                        static private void addFolderToZip String path  String srcFolder  ZipOutputStream zip        throws Exception       File folder   new File srcFolder        for  String fileName   folder list            if  path equals                addFileToZip folder getName    srcFolder         fileName  zip           else           addFileToZip path         folder getName    srcFolder           fileName  zip

User · Answer

I found this solution worked perfectly fine for me  Doesn t require any third party apis   test  is actually a folder will lots of file inside   String folderPath   C  Users Desktop test   String zipPath    C  Users Desktop test1 zip    private boolean zipDirectory String folderPath  String zipPath  throws IOException           byte   buffer   new byte 1024           FileInputStream fis   null          ZipOutputStream zos   null           try              zos   new ZipOutputStream new FileOutputStream zipPath                updateSourceFolder new File folderPath                 if  sourceFolder    null                    zos close                    return false                            generateFileAndFolderList new File folderPath                 for  String unzippedFile  fileList                    System out println sourceFolder   unzippedFile                    ZipEntry entry   new ZipEntry unzippedFile                   zos putNextEntry entry                    if   unzippedFile substring unzippedFile length  -1   equals File separator                       continue                  try                      fis   new FileInputStream sourceFolder   unzippedFile                       int len 0                      while   len   fis read buffer   gt 0                            zos write buffer 0 len                                           catch IOException e                        return false                    finally                       if  fis    null                          fis close                                                zos closeEntry              catch IOException e                return false            finally               zos close                fileList   null              sourceFolder   null                    return true             private void generateFileAndFolderList File node            if  node isFile                  fileList add generateZipEntry node getAbsoluteFile   toString                        if  node isDirectory                  String dir   node getAbsoluteFile   toString                fileList add dir substring sourceFolder length    dir length      File separator                String   subNode   node list                for  String fileOrFolderName   subNode                    generateFileAndFolderList new File node  fileOrFolderName                                       private void updateSourceFolder File node            if  node isFile      node isDirectory                  String sf   node getAbsoluteFile   toString                sourceFolder   sf substring 0   sf lastIndexOf       gt  0   sf lastIndexOf        sf lastIndexOf                      sourceFolder    File separator            else             sourceFolder   null             private String generateZipEntry String file            return file substring sourceFolder length    file length

User · Answer

I usually use a helper class I once wrote for this task   import java util zip    import java io     public class ZipExample       public static void main String   args           ZipHelper zippy   new ZipHelper            try               zippy zipDir  folderName   test zip              catch IOException e2                System err println e2                      class ZipHelper         public void zipDir String dirName  String nameZipFile  throws IOException           ZipOutputStream zip   null          FileOutputStream fW   null          fW   new FileOutputStream nameZipFile           zip   new ZipOutputStream fW           addFolderToZip     dirName  zip           zip close            fW close               private void addFolderToZip String path  String srcFolder  ZipOutputStream zip  throws IOException           File folder   new File srcFolder           if  folder list   length    0                addFileToZip path   srcFolder  zip  true                     else               for  String fileName   folder list                      if  path equals                            addFileToZip folder getName    srcFolder         fileName  zip  false                                      else                        addFileToZip path         folder getName    srcFolder         fileName  zip  false                                                        private void addFileToZip String path  String srcFile  ZipOutputStream zip  boolean flag  throws IOException           File folder   new File srcFile           if  flag                zip putNextEntry new ZipEntry path        folder getName                              else               if  folder isDirectory                      addFolderToZip path  srcFile  zip                             else                   byte   buf   new byte 1024                   int len                  FileInputStream in   new FileInputStream srcFile                   zip putNextEntry new ZipEntry path         folder getName                      while   len   in read buf    gt  0                        zip write buf  0  len

User · Answer

Here s a pretty terse Java 7  solution which relies purely on vanilla JDK classes  no third party libraries required   public static void pack final Path folder  final Path zipFilePath  throws IOException       try               FileOutputStream fos   new FileOutputStream zipFilePath toFile                 ZipOutputStream zos   new ZipOutputStream fos                  Files walkFileTree folder  new SimpleFileVisitor lt Path gt                  public FileVisitResult visitFile Path file  BasicFileAttributes attrs  throws IOException                   zos putNextEntry new ZipEntry folder relativize file  toString                      Files copy file  zos                   zos closeEntry                    return FileVisitResult CONTINUE                             public FileVisitResult preVisitDirectory Path dir  BasicFileAttributes attrs  throws IOException                   zos putNextEntry new ZipEntry folder relativize dir  toString                            zos closeEntry                    return FileVisitResult CONTINUE                                      It copies all files in folder  including empty directories  and creates a zip archive at zipFilePath

User · Answer

Here is the Java 8  example   public static void pack String sourceDirPath  String zipFilePath  throws IOException       Path p   Files createFile Paths get zipFilePath        try  ZipOutputStream zs   new ZipOutputStream Files newOutputStream p              Path pp   Paths get sourceDirPath           Files walk pp             filter path - gt   Files isDirectory path              forEach path - gt                  ZipEntry zipEntry   new ZipEntry pp relativize path  toString                   try                     zs putNextEntry zipEntry                     Files copy path  zs                     zs closeEntry                  catch  IOException e                    System err println e

User · Answer

It can be easily solved by package java util Zip no need any extra Jar files   Just copy the following code and run it with your IDE     Import all needed packages package general  import java io File  import java io FileInputStream  import java io FileOutputStream  import java io IOException  import java util ArrayList  import java util List  import java util zip ZipEntry  import java util zip ZipOutputStream   public class ZipUtils        private List  lt String gt  fileList      private static final String OUTPUT ZIP FILE    Folder zip       private static final String SOURCE FOLDER    D   Reports      SourceFolder path      public ZipUtils             fileList   new ArrayList  lt  String  gt                 public static void main String   args            ZipUtils appZip   new ZipUtils            appZip generateFileList new File SOURCE FOLDER            appZip zipIt OUTPUT ZIP FILE              public void zipIt String zipFile            byte   buffer   new byte 1024           String source   new File SOURCE FOLDER  getName            FileOutputStream fos   null          ZipOutputStream zos   null          try               fos   new FileOutputStream zipFile               zos   new ZipOutputStream fos                System out println  Output to Zip       zipFile               FileInputStream in   null               for  String file  this fileList                    System out println  File Added       file                   ZipEntry ze   new ZipEntry source   File separator   file                   zos putNextEntry ze                   try                       in   new FileInputStream SOURCE FOLDER   File separator   file                       int len                      while   len   in  read buffer    gt  0                            zos write buffer  0  len                                           finally                       in close                                                 zos closeEntry                System out println  Folder successfully compressed               catch  IOException ex                ex printStackTrace              finally               try                   zos close                  catch  IOException e                    e printStackTrace                                       public void generateFileList File node               add file only         if  node isFile                  fileList add generateZipEntry node toString                         if  node isDirectory                  String   subNote   node list                for  String filename  subNote                    generateFileList new File node  filename                                       private String generateZipEntry String file            return file substring SOURCE FOLDER length     1  file length               Refer mkyong  I changed the code for the requirement of current question

User · Answer

Java 6    import java io    import java util zip ZipEntry  import java util zip ZipOutputStream   public class Zip        private static final FileFilter FOLDER FILTER   new FileFilter              Override         public boolean accept File pathname                return pathname isDirectory                          private static final FileFilter FILE FILTER   new FileFilter              Override         public boolean accept File pathname                return pathname isFile                           private static void compress File file  ZipOutputStream outputStream  String path  throws IOException            if  file isDirectory                  File   subFiles   file listFiles FILE FILTER               if  subFiles    null                    for  File subFile   subFiles                        compress subFile  outputStream  new File path  subFile getName    getAbsolutePath                                                 File   subDirs   file listFiles FOLDER FILTER               if  subDirs    null                    for  File subDir   subDirs                        compress subDir  outputStream  new File path  subDir getName    getAbsolutePath                                               else if  file exists                  outputStream putNextEntry new ZipEntry path                FileInputStream inputStream   new FileInputStream file               byte   buffer   new byte 1024               int len              while   len   inputStream read buffer    gt   0                    outputStream write buffer  0  len                             outputStream closeEntry                         public static void compress String dirPath  String zipFilePath  throws IOException           File file   new File dirPath           final ZipOutputStream outputStream   new ZipOutputStream new FileOutputStream zipFilePath            compress file  outputStream                outputStream close

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This method zips a folder and adds all of the child files  amp  folders  including empty folders  into the zip file   void zipFolder Path sourceDir  Path targetFile  throws IOException       ZipDirectoryVisitor zipVisitor   new ZipDirectoryVisitor sourceDir       Files walkFileTree sourceDir  zipVisitor       FileOutputStream fos   new FileOutputStream targetFile toString         ZipOutputStream zos   new ZipOutputStream fos       byte   buffer   new byte 1024       for  ZipEntry entry   zipVisitor getZipEntries              zos putNextEntry entry           Path curFile   Paths get sourceDir getParent   toString    entry toString             if   curFile toFile   isDirectory                  FileInputStream in   new FileInputStream Paths get sourceDir getParent   toString    entry toString    toString                 int len              while   len   in read buffer    gt  0                    zos write buffer  0  len                             in close                      zos closeEntry              zos close         And here is the ZipDirectoryVisitor implementation   class ZipDirectoryVisitor extends SimpleFileVisitor lt Path gt        private Path dirToZip      private List lt ZipEntry gt  zipEntries     files and folders inside source folder as zip entries     public ZipDirectoryVisitor Path dirToZip  throws IOException           this dirToZip   dirToZip          zipEntries   new ArrayList lt  gt                 Override     public FileVisitResult visitFile Path path  BasicFileAttributes basicFileAttributes  throws IOException              According to zip standard backslashes            should not be used in zip entries         String zipFile   dirToZip getParent   relativize path  toString   replace                     ZipEntry entry   new ZipEntry zipFile           zipEntries add entry           return FileVisitResult CONTINUE               Override     public FileVisitResult preVisitDirectory Path path  BasicFileAttributes basicFileAttributes  throws IOException           String zipDir   dirToZip getParent   relativize path  toString   replace                        Zip directory entries should end with a forward slash         ZipEntry entry   new ZipEntry zipDir                 zipEntries add entry           return FileVisitResult CONTINUE               Override     public FileVisitResult visitFileFailed Path path  IOException e  throws IOException           System err format  Could not visit file  s while creating a file list from file tree   path           return FileVisitResult TERMINATE             public List lt ZipEntry gt  getZipEntries             return zipEntries

User · Answer

Java 7   commons io  public final class ZipUtils        public static void zipFolder final File folder  final File zipFile  throws IOException           zipFolder folder  new FileOutputStream zipFile               public static void zipFolder final File folder  final OutputStream outputStream  throws IOException           try  ZipOutputStream zipOutputStream   new ZipOutputStream outputStream                 processFolder folder  zipOutputStream  folder getPath   length     1                        private static void processFolder final File folder  final ZipOutputStream zipOutputStream  final int prefixLength              throws IOException           for  final File file   folder listFiles                  if  file isFile                      final ZipEntry zipEntry   new ZipEntry file getPath   substring prefixLength                    zipOutputStream putNextEntry zipEntry                   try  FileInputStream inputStream   new FileInputStream file                         IOUtils copy inputStream  zipOutputStream                                     zipOutputStream closeEntry                  else if  file isDirectory                      processFolder file  zipOutputStream  prefixLength

User · Answer

Enhanced Java 8  example  Forked from Nikita Koksharov s answer   public static void pack String sourceDirPath  String zipFilePath  throws IOException       Path p   Files createFile Paths get zipFilePath        Path pp   Paths get sourceDirPath       try  ZipOutputStream zs   new ZipOutputStream Files newOutputStream p            Stream lt Path gt  paths   Files walk pp             paths            filter path - gt   Files isDirectory path              forEach path - gt                  ZipEntry zipEntry   new ZipEntry pp relativize path  toString                   try                     zs putNextEntry zipEntry                     Files copy path  zs                     zs closeEntry                  catch  IOException e                    System err println e                                         Files walk has been wrapped in try with resources block so that stream can be closed  This resolves blocker issue identified by SonarQube  Thanks  Matt Harrison for pointing this

User · Answer

I have modified the above solutions and replaced Files walk with Files list  This also assumes the directory you are zipping only contains file and not any sub directories  private void zipDirectory Path dirPath  throws IOException           String zipFilePathStr   dirPath toString      quot  zip quot           Path zipFilePath   Files createFile Paths get zipFilePathStr             try  ZipOutputStream zs   new ZipOutputStream Files newOutputStream zipFilePath                  Files list dirPath                   filter filePath- gt   Files isDirectory filePath                    forEach filePath- gt                        ZipEntry zipEntry   new ZipEntry dirPath relativize filePath  toString                         try                           zs putNextEntry zipEntry                           Files copy filePath  zs                           zs closeEntry                                              catch  IOException e                            System err println e

User · Answer

I would use Apache Ant  which has an API to call tasks from Java code rather than from an XML build file   Project p   new Project    p init    Zip zip   new Zip    zip setProject p   zip setDestFile zipFile      a java io File for the zip you want to create zip setBasedir new File  D   reports     zip setIncludes  january       zip perform      Here I m telling it to start from the base directory D  reports and zip up the january folder and everything inside it   The paths in the resulting zip file will be the same as the original paths relative to D  reports  so they will include the january prefix

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