Read Content from Files which are inside Zip file

Question

I am trying to create a simple java program which reads and extracts the content from the file s  inside zip file  Zip file contains 3 files  txt  pdf  docx   I need to read the contents of all these files and I am using Apache Tika for this purpose    Can somebody help me out here to achieve the functionality   I have tried this so far but no success  Code Snippet  public class SampleZipExtract         public static void main String   args             List lt String gt  tempString   new ArrayList lt String gt             StringBuffer sbf   new StringBuffer             File file   new File  C   Users  xxx  Desktop  abc zip            InputStream input          try              input   new FileInputStream file             ZipInputStream zip   new ZipInputStream input             ZipEntry entry   zip getNextEntry               BodyContentHandler textHandler   new BodyContentHandler              Metadata metadata   new Metadata               Parser parser   new AutoDetectParser               while  entry   null                    if entry getName   endsWith   txt                                  entry getName   endsWith   pdf                                entry getName   endsWith   docx                   System out println  entry     entry getName           entry getSize                          parser parse input  textHandler  metadata  new ParseContext                          tempString add textHandler toString                                               zip close               input close                for  String text   tempString               System out println  Apache Tika - Converted input string       text              sbf append text              System out println  Final text from all the three files     sbf toString               catch  FileNotFoundException e                   TODO Auto-generated catch block             e printStackTrace              catch  IOException e                   TODO Auto-generated catch block             e printStackTrace              catch  SAXException e                   TODO Auto-generated catch block             e printStackTrace              catch  TikaException e                   TODO Auto-generated catch block             e printStackTrace

User · Answer

Because of the condition in while  the loop might never break   while  entry    null         If entry never becomes null here  loop will never break      Instead of the null check there  you can try this   ZipEntry entry   null  while   entry   zip getNextEntry       null         Rest of your code

User · Answer

As of Java 7  the NIO Api provides a better and more generic way of accessing the contents of Zip or Jar files  Actually  it is now a unified API which allows you to treat Zip files exactly like normal files    In order to extract all of the files contained inside of a zip file in this API  you d do this         In Java 8   private void extractAll URI fromZip  Path toDirectory  throws IOException      FileSystems newFileSystem fromZip  Collections emptyMap                 getRootDirectories                forEach root - gt                       in a full implementation  you d have to                    handle directories                  Files walk root  forEach path - gt  Files copy path  toDirectory                        In java 7   private void extractAll URI fromZip  Path toDirectory  throws IOException      FileSystem zipFs   FileSystems newFileSystem fromZip  Collections emptyMap          for Path root   zipFs getRootDirectories              Files walkFileTree root  new SimpleFileVisitor lt Path gt                   Override             public FileVisitResult visitFile Path file  BasicFileAttributes attrs                       throws IOException                      You can do anything you want with the path here                 Files copy file  toDirectory                   return FileVisitResult CONTINUE                              Override             public FileVisitResult preVisitDirectory Path dir  BasicFileAttributes attrs                       throws IOException                      In a full implementation  you d need to create each                     sub-directory of the destination directory before                     copying files into it                 return super preVisitDirectory dir  attrs

User · Answer

Sample code you can use to let Tika take care of container files for you  http   wiki apache org tika RecursiveMetadata  Form what I can tell  the accepted solution will not work for cases where there are nested zip files  Tika  however will take care of such situations as well

User · Answer

If you re wondering how to get the file content from each ZipEntry it s actually quite simple  Here s a sample code   public static void main String   args  throws IOException       ZipFile zipFile   new ZipFile  C  test zip         Enumeration lt   extends ZipEntry gt  entries   zipFile entries         while entries hasMoreElements             ZipEntry entry   entries nextElement            InputStream stream   zipFile getInputStream entry             Once you have the InputStream you can read it however you want

User · Answer

My way of achieving this is by creating ZipInputStream wrapping class that would handle that would provide only the stream of current entry   The wrapper class   public class ZippedFileInputStream extends InputStream        private ZipInputStream is       public ZippedFileInputStream ZipInputStream is           this is   is              Override     public int read   throws IOException           return is read                Override     public void close   throws IOException           is closeEntry               The use of it       ZipInputStream zipInputStream   new ZipInputStream new FileInputStream  SomeFile zip          while  entry   zipInputStream getNextEntry      null          ZippedFileInputStream archivedFileInputStream   new ZippedFileInputStream zipInputStream               perform whatever logic you want here with ZippedFileInputStream           note that this will only close the current entry stream and not the ZipInputStream      archivedFileInputStream close               zipInputStream close      One advantage of this approach  InputStreams are passed as an arguments to methods that process them and those methods have a tendency to immediately close the input stream after they are done with it

[java] Read Content from Files which are inside Zip file

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