Android decompression Feature

Mainly used in Zip:

1 Import java.util.Enumeration; 2 Import java.util.zip.CRC32; 3 Import Java.util.zip.CheckedOutputStream; 4 Import Java.util.zip.ZipEntry; 5 Import Java.util.zip.ZipFile; 6 import Java.util.zip.ZipOutputStream;

Unzip the file:

1 /**2 * Decompression function. Unzip the Zippath file into the FolderPath directory.3      *4      * @paramzipfile zip file5      * @paramDestDir extracted to the file path6      * @throwsjava.io.IOException7      */8      Public Static voidUpzipfile (File zipfile, String destDir) {9File Pathfile =NewFile (DestDir + "/");Ten         if(!pathfile.exists ()) { One pathfile.mkdirs (); A         } -  -         Try { theZipFile zip =NewZipFile (ZipFile); -  -              for(Enumeration<?> entries =zip.entries (); entries.hasmoreelements ();) { -ZipEntry entry =(ZipEntry) entries.nextelement (); +String Zipentryname =entry.getname (); -  +InputStream in =Zip.getinputstream (entry); AString Outpath = (DestDir + "/" + Zipentryname). ReplaceAll ("\\*", "/"); at  -                 //to determine if a path exists, create a file path if it does not exist -File File =NewFile (outpath.substring (0, Outpath.lastindexof ('/')))); -                 if(!file.exists ()) { - file.mkdirs (); -                 } in                 //determine whether the full path of the file is a folder, if it is uploaded above, do not need to unzip -                 if(NewFile (Outpath). Isdirectory ()) { to                     Continue; +                 } -                 //output file path information the System.out.println (outpath); *  $OutputStream out =NewFileOutputStream (outpath);Panax Notoginseng                 byte[] Buf1 =New byte[1024]; -                 intLen; the                  while(len = In.read (buf1)) > 0) { +Out.write (BUF1, 0, Len); A                 } the in.close (); + out.close (); -             } $}Catch(IOException e) { $ e.printstacktrace (); -         } -}

Compressed files:

(1) First to declare a compression class:

1  Public Static classZipcompressor {2         Static Final intBUFFER = 1024 * 128;3 4         PrivateFile ZipFile;5 6          Publiczipcompressor (String pathName) {7ZipFile =NewFile (pathName);8         }9 Ten          Public voidCompress (String srcpathname) { OneFile File =NewFile (srcpathname); A             if(!file.exists ()) -                 Throw NewRuntimeException (Srcpathname + "does not exist! "); -             Try { theFileOutputStream FileOutputStream =NewFileOutputStream (ZipFile); -Checkedoutputstream cos =NewCheckedoutputstream (FileOutputStream,NewCRC32 ()); -Zipoutputstream out =Newzipoutputstream (COS); -String Basedir = ""; + compress (file, out, basedir); - out.close (); +}Catch(Exception e) { A                 Throw NewRuntimeException (e); at             } -         } -  -         Private voidCompress (file file, zipoutputstream out, String basedir) { -             /*determine whether a directory or a file*/ -             if(File.isdirectory ()) { inSystem.out.println ("Compression:" + Basedir +file.getname ()); -                  This. compressdirectory (file, out, basedir); to}Else { +System.out.println ("Compression:" + Basedir +file.getname ()); -                  This. Compressfile (file, out, basedir); the             } *         } $ Panax Notoginseng         /**Compress a directory*/ -         Private voidcompressdirectory (File dir, zipoutputstream out, String basedir) { the             if(!dir.exists ()) +                 return; A  thefile[] Files =dir.listfiles (); +              for(inti = 0; i < files.length; i++) { -                 /*Recursive*/ $Compress (Files[i], out, Basedir + dir.getname () + "/"); $             } -         } -  the         /**Compress a file*/ -         Private voidcompressfile (file file, zipoutputstream out, String basedir) {Wuyi             if(!file.exists ()) { the                 return; -             } Wu             Try { -Bufferedinputstream bis =NewBufferedinputstream (Newfileinputstream (file)); AboutZipEntry entry =NewZipEntry (Basedir +file.getname ()); $ out.putnextentry (entry); -                 intcount; -                 byteData[] =New byte[BUFFER]; -                  while(count = bis.read (data, 0, BUFFER))! =-1) { AOut.write (data, 0, count); +                 } the bis.close (); -}Catch(Exception e) { $                 Throw NewRuntimeException (e); the             } the         } the}

Compression classes use:

1  Public Static void Compress (String srcpathname, String zippathname) {2     New zipcompressor (zippathname); 3     zipcompresspr.compress (srcpathname); 4 }

Android decompression Feature