Java file compression and decompression

Feature implementation.

 Packagecom.test;ImportJava.io.File;ImportJava.io.BufferedOutputStream;ImportJava.io.BufferedInputStream;ImportJava.io.FileOutputStream;ImportJava.io.FileInputStream;ImportJava.util.zip.ZipEntry;ImportJava.util.zip.ZipInputStream;ImportJava.util.zip.ZipOutputStream;/*** This class implements folders compressed into Zip files and zip files extracted * *@authorAdministrator **/ Public classZip {PrivateZipinputstream Zipin;//Unzip zip    PrivateZipoutputstream zipout;//Compress zip    PrivateZipEntry ZipEntry; Private Static intBufSize;//size of bytes    Private byte[] buf; Private intreadedbytes;  PublicZip () { This(512); }     PublicZip (intbufSize) {         This. bufSize =bufSize;  This. BUF =New byte[ This. BufSize]; }    //compress files within a folder     Public voidDozip (String zipdirectory) {//Zipdirectorypath: folder name that needs to be compressedfile file;        File Zipdir; Zipdir=NewFile (zipdirectory); String Zipfilename= Zipdirectory + ". zip";//zip file name generated after compression        Try {             This. ZipOut =NewZipoutputstream (NewBufferedoutputstream (NewFileOutputStream (zipfilename)); Handledir (Zipdir, This. ZipOut);  This. Zipout.close (); } Catch(Exception IoE) {ioe.printstacktrace (); }    }    //called by Dozip to complete the directory file read recursively    Private voidHandledir (File dir, Zipoutputstream zipout)throwsException {FileInputStream Filein;        file[] files; Files=Dir.listfiles (); if(Files.length = = 0) {//If the directory is empty, it is created separately. //in the ZipEntry isdirectory () method, the directory ends with "/".             This. Zipout.putnextentry (NewZipEntry (dir.tostring () + "/"));  This. Zipout.closeentry (); } Else{//If the directory is not empty, the directories and files are processed separately.             for(File filename:files) {if(Filename.isdirectory ()) {Handledir (FileName, This. ZipOut); } Else{Filein=NewFileInputStream (fileName); String name=Dir.getname (); //The resulting compressed package is stored in the original directory                     This. Zipout.putnextentry (NewZipEntry (name + "/" +filename.getname (). toString ()); //This method is stored in the project directory//This.zipOut.putNextEntry (New//ZipEntry (filename.tostring ()));                     while(( This. readedbytes = Filein.read ( This. buf)) > 0) {                         This. Zipout.write ( This. buf, 0, This. readedbytes); }                     This. Zipout.closeentry (); }            }        }    }    //unzip the specified zip file     Public voidUnZip (String unzipfilename) {//unzipfilename the zip file name to unzipFileOutputStream fileout;        File file; String F= unzipfilename.substring (0, Unzipfilename.length ()-4); File FF=NewFile (f); Try {             This. Zipin =NewZipinputstream (NewBufferedinputstream (NewFileInputStream (unzipfilename));  while(( This. ZipEntry = This. Zipin.getnextentry ())! =NULL) {file=NewFile ( This. Zipentry.getname ()); if( This. Zipentry.isdirectory ())                {File.mkdirs (); } Else {                    //if the directory for the specified file does not exist, it is created.File parent =File.getparentfile (); if(!parent.exists ())                    {Parent.mkdirs (); }                    if(!ff.exists ())                    {Ff.mkdir (); } fileout=NewFileOutputStream (f + "/" +file.getname ()); //fileout = new FileOutputStream (file); This method is stored in the project directory                     while(( This. readedbytes = This. Zipin.read ( This. buf)) > 0) {Fileout.write ( This. buf, 0, This. readedbytes);                } fileout.close (); }                 This. Zipin.closeentry (); }        } Catch(Exception IoE) {ioe.printstacktrace (); }    }    //Set Buffer size     Public voidSetbufsize (intbufSize) {         This. bufSize =bufSize; }    //Test Zip class     Public Static voidMain (string[] args)throwsException {Zip zip=NewZip (); Zip.dozip ("E:\\test");//zip.unzip ("C:\\test.zip");    }}

Java file compression and decompression