zipping problem in applet very urgent

hi friends
i am using this applet for zipping A:// files and it will get zipped in and uploaded to my server.my files are getting uploadd but when i want to unzip those files with winzip it on server is saying it is not a valid archive.can some body pls correct my code and tell me what is wromg in my code?
//Title: Global Web
//Version:
//Copyright: Copyright (c) 1999
//Author: Nitin Phadnis
//Company: Waterford Institute
//Description: Your description
package org.waterford.globalweb.presentation;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
import java.util.zip.*;
public class GetData extends Applet implements ActionListener
{
boolean isStandalone = false;
private Panel labelPanel=new Panel();
private Panel choicePanel=new Panel();
private Panel drivePanel=new Panel();
private Panel butPanel=new Panel();
private Label label=new Label("Insert WCART Disk for Data Upload.");
private Label diskLabel=new Label("Select Disk :");
private Button upload=new Button("Upload Data");
private Choice drive=new Choice();
private TextArea status=new TextArea(10,7);
public static final int BUFFER_SIZE=1024512;
//Get a parameter value
public String getParameter(String key, String def) {
return isStandalone ? System.getProperty(key, def) :
(getParameter(key) != null ? getParameter(key) : def);
}
//Construct the applet
public GetData() {
}
//Initialize the applet
public void init() {
System.out.println("init");
System.out.println("os.name="+System.getProperty("os.name","not known"));
System.out.println("os.arch="+System.getProperty("os.arch","not known"));
System.out.println("os.version="+System.getProperty("os.version","not known"));
System.out.println("java.class.version="+System.getProperty("java.class.version","not known"));
System.out.println("java.vendor="+System.getProperty("java.vendor","not known"));
System.out.println("java.vendor.url="+System.getProperty("java.vendor.url","not known"));
System.out.println("java.version="+System.getProperty("java.version","not known"));
try
{
System.out.println("java.class.path="+System.getProperty("java.class.path","not known"));
System.out.println("java.home="+System.getProperty("java.home","not known"));
System.out.println("file.separator="+System.getProperty("file.separator","not known"));
System.out.println("line.separator="+System.getProperty("line.separator","not known"));
System.out.println("path.separator="+System.getProperty("path.separator","not known"));
}
catch(Exception e)
{
status.setText("The Browser will not allow me to access your hard disk. Install a Plugin and Try again");
return;
}
try
{
jbInit();
}
catch(Exception e)
{
e.printStackTrace();
}
}
//Component initialization
private void jbInit() throws Exception
{
this.setLayout(new BorderLayout());
this.setBackground(Color.white);
this.setSize(new Dimension(450,300));
labelPanel.setBackground(Color.white);
choicePanel.setBackground(Color.white);
choicePanel.setLayout(new BorderLayout());
butPanel.setBackground(Color.white);
drivePanel.setBackground(Color.white);
status.setBackground(Color.white);
status.append("Select the Drive and click the upload button.");
status.setForeground(Color.black);
status.setEditable(false);
label.setFont(new Font("TimesNewRoman",Font.BOLD,15));
drive.add("A://");
drive.add("B://");
drive.addItemListener(new ItemListener ()
{
public void itemStateChanged(ItemEvent ie)
{
upload.setEnabled(true);
}
});
upload.addActionListener(this);
labelPanel.add(label);
drivePanel.add(diskLabel);
drivePanel.add(drive);
choicePanel.add(drivePanel,BorderLayout.NORTH);
choicePanel.add(status,BorderLayout.CENTER);
butPanel.add(upload);
this.add(labelPanel,BorderLayout.NORTH);
this.add(choicePanel,BorderLayout.CENTER);
this.add(butPanel,BorderLayout.SOUTH);
}
//Start the applet
public void start()
{
}
//Stop the applet
public void stop()
{
}
//Destroy the applet
public void destroy()
{
choicePanel.setVisible(false);
butPanel.setVisible(false);
labelPanel.setVisible(false);
}
//Get Applet information
public String getAppletInfo()
{
return "Applet Information";
}
//Get parameter info
public String[][] getParameterInfo()
{
return null;
}
//Main method
public static void main(String[] args) {
GetData applet = new GetData();
applet.isStandalone = true;
Frame frame;
frame = new Frame() {
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
this.dispose();
System.exit(0);
}
}
public synchronized void setTitle(String title) {
super.setTitle(title);
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
}
};
frame.setTitle("Applet Frame");
frame.add(applet, BorderLayout.CENTER);
applet.init();
applet.start();
frame.setSize(700,430);
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
if(e.getActionCommand().equals("Upload Data"))
getFiles();
else
return;
}
/**
* this method is used for getting a files
*/
public void getFiles()
{
String selectedDrive=drive.getSelectedItem();
File dir=new File(selectedDrive);
File[] files=dir.listFiles();
if(files==null)
{
status.append("\nEmpty Disk Found OR Select a Proper Drive for data "
+"upload.");
upload.setEnabled(false);
return;
}
else
{
for(int i=0;i<files.length;i++)
{
if((files[i].getName().equalsIgnoreCase("SM") && files[i].isDirectory())
| | (files[i].getName().equalsIgnoreCase("ITEMDIFF") &&
files[i].isDirectory()) | | (files[i].getName().equalsIgnoreCase("RESULTS")
&& files[i].isDirectory()))
{
sendZipFile(files[i]);
}
else
{
status.append("\nDisk is not a WCART Disk."+
"\nPlease insert a WCART Disk.");
return;
}
}
}
}
/**
* making of zipfile
* @param File,String
*/
public void sendZipFile(File f)
{
String fileName=f.getName();
fileName="wcart"+fileName.toLowerCase()+".zip";
try
{
status.append("\nAttempting a upload of "+fileName);
File[] fileList=f.listFiles();
if(fileList==null)
{
return;
}
status.append("\nCreate URL="+getCodeBase()+"/FormUpload.po");
if(!("http".equals(getCodeBase().getProtocol())))
{
status.append("\nRequired Protocoal not found.");
return ;
}
URL servlet=new URL(getCodeBase(),"/FormUpload.po");
status.append("\n"+servlet.toString());
URLConnection conn=servlet.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestProperty("Content-type","multipart/form-data;boundary="+
getBoundary());
DataOutputStream out = new DataOutputStream(conn.getOutputStream());
out.writeBytes("\r\n" + "--" +getBoundary() + "\r\n");
out.writeBytes("content-disposition: form-data; name=\"appletfile\";filename=\""
+ fileName + "\"\r\n");
out.writeBytes("content-type: application/x-zip-compressed" + "\r\n\r\n");
ZipOutputStream zout=new ZipOutputStream(out);
try
{
for(int i=0;i<fileList.length;i++)
{
System.out.println("Files are :"+fileList[i]);
sendFile(fileList[i],zout);
}
}
finally
{
try
{
String s;
out.writeBytes("\r\n"+"--"+getBoundary()+"\r\n") ;
System.out.println("DataOutputStream size is :"+out.size());
zout.close();
out.close();
/*
BufferedReader br=new BufferedReader
(new InputStreamReader(conn.getInputStream()));
while((s=br.readLine())!=null)
status.append("\n"+s);
*/
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}
catch (Exception ex)
{
System.out.println("Exception Occured :"+ex.getMessage());
ex.printStackTrace();
}
}
/**
* sending of zipfile
* @param File
*/
public void sendFile(File f,ZipOutputStream zout)
{
byte[] buffer=new byte[BUFFER_SIZE];
try
{
try
{
if(f.isDirectory())
{
File[] fileList=f.listFiles();
for(int i=0;i<fileList.length;i++)
{
sendFile(fileList[i],zout);
}
}
else
{
int n;
FileInputStream fin=new FileInputStream(f);
String absolutePath=f.getAbsolutePath().substring(2);
ZipEntry zipEntry=new ZipEntry(f.getAbsolutePath().substring(2));
zout.putNextEntry(zipEntry);
while((n=fin.read(buffer,0,buffer.length))!=-1)
{
zout.write(buffer,0,n);
}
zout.closeEntry();
}
}
catch(Exception ex){ex.printStackTrace();}
}
catch(Exception ex)
{
System.out.println("Exception Occured :"+ex.getMessage());
ex.printStackTrace();
}
}
/**
* method defined for boundry
*/
private String getBoundary()
{
return "----------------RishiPravinkumarDalpatramYagnikRajPravinkumar"
+"DalpatramYagnikPravinkumarDalpatramYagnik----------------------------";
}
}
it is very urgent.
Rishi

Make sure your servlet isn't using a text reader to pull the data in - ZIP files are binary!