[JAVA100 case]040, compression and decompression file

FileName: Myzip.java


import java.io.*;


import java.util.*;


import java.util.zip.*;


/**


* <p>title: Document compression and decompression </p>


* <p>description: Use Zipinputstream and zipoutputstream to file


* and directory for compression and decompression processing </p>


* <p>copyright:copyright (c) 2003</p>


* <p>Filename:myZip.java</p>


* @version 1.0


*/


public class myzip{


/**


*<br> Method Description: The implementation of file compression processing


*<br> input parameters: string[] FS compressed file array


*<br> return type:


*/


public void Zipfiles (string[] fs) {


try{


String fileName = fs[0];


FileOutputStream f =


New FileOutputStream (filename+ ". zip");


//Using output stream checking


Checkedoutputstream cs =


New Checkedoutputstream (F,new Adler32 ());


//Declaration output Zip stream


Zipoutputstream out =


New Zipoutputstream (New Bufferedoutputstream (CS));


//write a note


out.setcomment ("A test of Java zipping");


//compression of multiple files


for (int i=1;i<fs.length;i++) {


System.out.println ("Write file" +fs[i]);


BufferedReader in =


New BufferedReader (


new FileReader (Fs[i]);


Out.putnextentry (New ZipEntry (fs[i));


int C;


while ((C=in.read ())!=-1)


Out.write (c);


In.close ();


　　　 }


//Turn off output stream


Out.close ();


System.out.println ("Checksum::" +cs.getchecksum (). GetValue ());


}catch (Exception e) {


System.err.println (e);


　　}


　}


/**


*<br> Method Description: Extract zip file


*<br> input parameter: String filename extract zip file name


*<br> return type:


*/


public void Unzipfile (String fileName) {


try{


System.out.println ("Read zip file ...");


//File input stream


FileInputStream fi =


New FileInputStream (filename+ ". zip");


//Input flow check


checkedinputstream CSI = new Checkedinputstream (fi,new Adler32 ());


//input stream compression


Zipinputstream in2 =


New Zipinputstream (


New Bufferedinputstream (CSI));


zipentry ze;


System.out.println ("Checksum::" +csi.getchecksum (). GetValue ());


//Extract All Files


while ((Ze = in2.getnextentry ())!=null) {


System.out.println ("Reading file" +ze);


int x;


while ((x= in2.read ())!=-1)


//Here is the write file, write is output in byte.


System.out.write (x);


　　　 }


In2.close ();


}catch (Exception e) {


System.err.println (e);


　　}


　}


/**


*<br> Method Description: Read the zip file list


*<br> input parameter: String filename zip file name


*<br> return type: Vector file list


*/


public Vector listfile (String fileName) {


try{


string[] Arst=null;


vector vtemp = new vector ();


//zip File Object


ZipFile ZF = new ZipFile (filename+ ". zip");


Enumeration E = Zf.entries ();


while (e.hasmoreelements ()) {


zipentry ze2 = (zipentry) e.nextelement ();


System.out.println ("File:" +ze2);


vtemp.addelement (ZE2);


　　　 }


return vtemp;


}catch (Exception e) {


System.err.println (e);


return null;


　　}


　}


/**


*<br> Method Description: Main method


*<br> input Parameters:


*<br> return type:


*/


public static void Main (string[] args) {


try{


String fileName = args[0];


myzip myzip = new Myzip ();


myzip.zipfiles (args);


Myzip.unzipfile (fileName);


Vector dd = myzip.listfile (fileName);


System.out.println ("File List:" +DD);


}catch (Exception e) {


E.printstacktrace ();


　　}


　}


}