Tutorial on using the tool class for Java decompression zip and rar

Package decompress;

Import Java.io.File;

Import Java.io.FileOutputStream;

Import Org.apache.tools.ant.Project;

Import Org.apache.tools.ant.taskdefs.Expand;

Import de.innosystec.unrar.Archive;

Import De.innosystec.unrar.rarfile.FileHeader;

public class Decompressutil {

/**

* Extract zip-format compression Package

* The corresponding is Ant.jar

*/

private static void Unzip (String sourcezip,string DestDir) throws exception{

try{

Project P = new Project ();

Expand e = new Expand ();

E.setproject (P);

E.SETSRC (New File (Sourcezip));

E.setoverwrite (FALSE);

E.setdest (New File (DestDir));

/*

The Zip tool under ant has a default compression encoding of UTF-8 encoding,

While WinRAR software compression is used by Windows default GBK or GB2312 encoding

Therefore, the encoding format should be developed when extracting

*/

E.setencoding ("GBK");

E.execute ();

}catch (Exception e) {

Throw e;

}

}

/**

* Unzip the RAR format compression package.

* The corresponding is Java-unrar-0.3.jar, but Java-unrar-0.3.jar will use the Commons-logging-1.1.1.jar

*/

private static void Unrar (String sourcerar,string destDir) throws exception{

Archive a = null;

FileOutputStream fos = null;

try{

A = new Archive (new File (Sourcerar));

Fileheader fh = A.nextfileheader ();

while (Fh!=null) {

if (!fh.isdirectory ()) {

1 according to different operating systems to get the corresponding destDirName and destFileName

String compressfilename = fh.getfilenamestring (). Trim ();

String destfilename = "";

String destdirname = "";

Non-Windows systems

if (File.separator.equals ("/")) {

destFileName = DestDir + compressfilename.replaceall ("\\\\", "/");

destDirName = destfilename.substring (0, Destfilename.lastindexof ("/"));

Windows system

}else{

destFileName = DestDir + compressfilename.replaceall ("/", "\\\\");

destDirName = destfilename.substring (0, destfilename.lastindexof ("\ \"));

}

2 Creating a Folder

File dir = new file (destdirname);

if (!dir.exists () | |! Dir.isdirectory ()) {

Dir.mkdirs ();

}

3 Extracting files

FOS = new FileOutputStream (new File (destFileName));

A.extractfile (FH, FOS);

Fos.close ();

FOS = null;

}

FH = A.nextfileheader ();

}

A.close ();

A = null;

}catch (Exception e) {

Throw e;

}finally{

if (fos!=null) {

Try{fos.close (); fos=null;} catch (Exception e) {e.printstacktrace ();}

}

if (a!=null) {

Try{a.close (); a=null;} catch (Exception e) {e.printstacktrace ();}

}

}

}

/**

* Unzip

*/

public static void Decompress (String sourcefile,string DestDir) throws exception{

Ensure that the folder path is finally "/" or "\"

Char Lastchar = Destdir.charat (Destdir.length ()-1);

if (lastchar!= '/' &&lastchar!= ' \ \ ') {

DestDir + = File.separator;

}

According to the type, do the corresponding decompression

String type = sourcefile.substring (Sourcefile.lastindexof (".") +1);

if (type.equals ("Zip")) {

Decompressutil.unzip (SourceFile, DestDir);

}else if (type.equals ("rar")) {

Decompressutil.unrar (SourceFile, DestDir);

}else{

throw new Exception ("Zip and rar only compression packs are supported! ");

}

}

}

Tutorial on using the tool class for Java decompression zip and rar