Android Zip compression

Recently need to compress the output files, understand the next Android compression function, the source code is as follows:

Activity invocation:

Try {            ziputil2.zip (Exportpath, Exportpath+ ". zip");         Catch (Exception e) {            //  TODO auto-generated catch block            e.printstacktrace ();        } 

Compression class Prototypes:

 Packagecom.tecsun.idc.utils;ImportJava.io.File;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;Importjava.io.IOException;ImportJava.io.InputStream;Importjava.util.Enumeration;ImportJava.util.zip.ZipEntry;ImportJava.util.zip.ZipFile;ImportJava.util.zip.ZipOutputStream; Public classZIPUTIL2 { Public Static voidZip (string src, string dest)throwsIOException {//provides a data item to compress into a zip archive output streamZipoutputstream out =NULL; Try{File OutFile=NewFile (dest);//source files or directoriesFile fileordirectory =NewFile (SRC);//Compressed file pathout =NewZipoutputstream (NewFileOutputStream (outFile)); //False If this file is a file.        if(Fileordirectory.isfile ()) {zipfileordirectory (out, Fileordirectory,""); } Else {        //returns a file or an empty array. file[] Entries =Fileordirectory.listfiles ();  for(inti = 0; i < entries.length; i++) {         //recursive compression, update curpathsZipfileordirectory (out, entries[i], ""); }       }      } Catch(IOException ex) {ex.printstacktrace (); } finally {       //turn off the output stream       if(Out! =NULL) {        Try{out.close (); } Catch(IOException ex) {ex.printstacktrace (); }       }      }     }          Private Static voidZipfileordirectory (Zipoutputstream out, File fileordirectory, String curpath)throwsIOException {//reads the input stream of bytes from a fileFileInputStream in =NULL; Try {       //returns False if this file is a directory.        if(!fileordirectory.isdirectory ()) {        //Compress Files        byte[] buffer =New byte[4096]; intBytes_read; Inch=NewFileInputStream (fileordirectory); //instance represents a zip archive within a single entryZipEntry entry =NewZipEntry (Curpath+fileordirectory.getname ()); //entry information is written to the underlying streamout.putnextentry (entry);  while((Bytes_read = in.read (buffer))! =-1) {out.write (buffer,0, Bytes_read);       } out.closeentry (); } Else {        //Compressed Directoryfile[] Entries =Fileordirectory.listfiles ();  for(inti = 0; i < entries.length; i++) {         //recursive compression, update curpathszipfileordirectory (out, entries[i], Curpath+ fileordirectory.getname () + "/"); }       }      } Catch(IOException ex) {ex.printstacktrace (); //throw ex;}finally {       if(In! =NULL) {        Try{in.close (); } Catch(IOException ex) {ex.printstacktrace (); }}} @SuppressWarnings ("Unchecked")      Public Static voidUnzip (string zipfilename, string outputdirectory)throwsIOException {zipfile zipfile=NULL; Try{ZipFile=NewZipFile (zipfilename); Enumeration e=zipfile.entries (); ZipEntry ZipEntry=NULL; File dest=NewFile (outputdirectory);       Dest.mkdirs ();  while(E.hasmoreelements ()) {ZipEntry=(ZipEntry) e.nextelement (); String EntryName=Zipentry.getname (); InputStream in=NULL; FileOutputStream out=NULL; Try {         if(Zipentry.isdirectory ()) {String name=Zipentry.getname (); Name= name.substring (0, Name.length ()-1); File F=NewFile (OutputDirectory +File.separator+name);         F.mkdirs (); } Else {          intindex = entryname.lastindexof ("\ \"); if(Index! =-1) {File DF=NewFile (OutputDirectory +File.separator+ entryname.substring (0, index));          Df.mkdirs (); } Index= Entryname.lastindexof ("/"); if(Index! =-1) {File DF=NewFile (OutputDirectory +File.separator+ entryname.substring (0, index));          Df.mkdirs (); } File F=NewFile (OutputDirectory +File.separator+zipentry.getname ()); //f.createnewfile ();in =Zipfile.getinputstream (ZipEntry); out=NewFileOutputStream (f); intC; byte[] by =New byte[1024];  while((c = In.read (by))! =-1) {Out.write (by,0, c);         } out.flush (); }        } Catch(IOException ex) {ex.printstacktrace (); Throw NewIOException ("Decompression failed:" +ex.tostring ()); } finally {         if(In! =NULL) {          Try{in.close (); } Catch(IOException ex) {}}if(Out! =NULL) {          Try{out.close (); } Catch(IOException ex) {}}} }      } Catch(IOException ex) {ex.printstacktrace (); Throw NewIOException ("Decompression failed:" +ex.tostring ()); } finally {       if(ZipFile! =NULL) {        Try{zipfile.close (); } Catch(IOException ex) {}}} }    }

Android Zip compression