Problem in downloading

[vikasini]

Hi friends,

I have a servlet coding where i can download a folder from FTP.
The folder is zipped and stored in the FTP server.
While the client downloads the zip file the it should be unzipped and stored in the client machine.
Here is the code..

import javax.servlet.http.*;
import javax.servlet.*;
import javax.servlet.ServletOutputStream;
import java.io.*;
import java.awt.*;
import java.util.*;
import java.util.zip.*;
import java.net.*;

public class TempDownload1 extends HttpServlet{

public static void unzip(ZipFile zip, Component parentComponent, File outputDir) throws IOException
{}

public void doGet(HttpServletRequest req, HttpServletResponse res)
 throws ServletException, IOException
 {
    byte[] buffer = new byte[16384];
    //source
    ZipFile zip=new ZipFile("ftp://username:pswd@xxx.xx.xxx.xx/location/filename.zip");
    Component parentComponent=null;
    //destination
    File outputDir = new File("C:/");
    Enumeration entries = zip.entries();
    for ( int i = 0; entries.hasMoreElements(); )
            {
	ZipEntry entry = (ZipEntry) entries.nextElement();
	File File = new File(outputDir, entry.getName());
	File.getParentFile().mkdirs();
	if (!entry.isDirectory())
	  {
	    InputStream in = null;
	    OutputStream out = null;
	try {
	     in = zip.getInputStream(entry);
	     out = new FileOutputStream(File);
	     for (int n = 0; (n = in.read(buffer)) > -1; )
	     out.write(buffer, 0, n);
	     }
                 finally {
		try {
		       out.close();
	                     }
		catch (IOException e) {}
	           }
	    }
	 }
unzip(zip, parentComponent ,outputDir);

    }
}

While trying to compile the servlet code it's fine but when the servlet is executed the following exception occurs

Exception : java.util.zip.Z ipException: The filename, directory name, or volume label syntax is incorrect.

Can anyone help me out..
Thanks in advance

[r035198x]

Hi friends,

I have a servlet coding where i can download a folder from FTP.
The folder is zipped and stored in the FTP server.
While the client downloads the zip file the it should be unzipped and stored in the client machine.
Here is the code..

import javax.servlet.http.*;
import javax.servlet.*;
import javax.servlet.ServletOutputStream;
import java.io.*;
import java.awt.*;
import java.util.*;
import java.util.zip.*;
import java.net.*;

public class TempDownload1 extends HttpServlet{

public static void unzip(ZipFile zip, Component parentComponent, File outputDir) throws IOException
{}

public void doGet(HttpServletRequest req, HttpServletResponse res)
 throws ServletException, IOException
 {
    byte[] buffer = new byte[16384];
    //source
    ZipFile zip=new ZipFile("ftp://username:pswd@xxx.xx.xxx.xx/location/filename.zip");
    Component parentComponent=null;
    //destination
    File outputDir = new File("C:/");
    Enumeration entries = zip.entries();
    for ( int i = 0; entries.hasMoreElements(); )
            {
	ZipEntry entry = (ZipEntry) entries.nextElement();
	File File = new File(outputDir, entry.getName());
	File.getParentFile().mkdirs();
	if (!entry.isDirectory())
	  {
	    InputStream in = null;
	    OutputStream out = null;
	try {
	     in = zip.getInputStream(entry);
	     out = new FileOutputStream(File);
	     for (int n = 0; (n = in.read(buffer)) > -1; )
	     out.write(buffer, 0, n);
	     }
                 finally {
		try {
		       out.close();
	                     }
		catch (IOException e) {}
	           }
	    }
	 }
unzip(zip, parentComponent ,outputDir);

    }
}

While trying to compile the servlet code it's fine but when the servlet is executed the following exception occurs

Exception : java.util.zip.Z ipException: The filename, directory name, or volume label syntax is incorrect.

Can anyone help me out..
Thanks in advance

At which line?

[vikasini]

At which line?

At line num 20
i.e., ZipFile zip=new ZipFile("ftp://username:pswd@x xx.xx.xxx.xx/location");

[Nepomuk]

Hi friends,

I have a servlet coding where i can download a folder from FTP.
The folder is zipped and stored in the FTP server.
While the client downloads the zip file the it should be unzipped and stored in the client machine.
Here is the code..

import javax.servlet.http.*;
import javax.servlet.*;
import javax.servlet.ServletOutputStream;
import java.io.*;
import java.awt.*;
import java.util.*;
import java.util.zip.*;
import java.net.*;

public class TempDownload1 extends HttpServlet{

public static void unzip(ZipFile zip, Component parentComponent, File outputDir) throws IOException
{}

public void doGet(HttpServletRequest req, HttpServletResponse res)
 throws ServletException, IOException
 {
    byte[] buffer = new byte[16384];
    //source
    ZipFile zip=new ZipFile("ftp://username:pswd@xxx.xx.xxx.xx/location/filename.zip");
    Component parentComponent=null;
    //destination
    File outputDir = new File("C:/");
    Enumeration entries = zip.entries();
    for ( int i = 0; entries.hasMoreElements(); )
            {
	ZipEntry entry = (ZipEntry) entries.nextElement();
	File File = new File(outputDir, entry.getName());
	File.getParentFile().mkdirs();
	if (!entry.isDirectory())
	  {
	    InputStream in = null;
	    OutputStream out = null;
	try {
	     in = zip.getInputStream(entry);
	     out = new FileOutputStream(File);
	     for (int n = 0; (n = in.read(buffer)) > -1; )
	     out.write(buffer, 0, n);
	     }
                 finally {
		try {
		       out.close();
	                     }
		catch (IOException e) {}
	           }
	    }
	 }
unzip(zip, parentComponent ,outputDir);

    }
}

While trying to compile the servlet code it's fine but when the servlet is executed the following exception occurs

Exception : java.util.zip.Z ipException: The filename, directory name, or volume label syntax is incorrect.

Can anyone help me out..
Thanks in advance

IDoes ZipFile really support ftp adresses? I doubt it. "File" doesn't seem to support them.

Can't you give a relative adress? If it's the same filesystem, it won't be so problematic. This way, it tries to connect to
C:\workspace\ft p:\username:psw d@xxx.xx.xxx.xx \location\filen ame.zip (when "C:\workspa ce" is your working directory), which is of course not what you're looking for.

Greetings,
Nepomuk

[r035198x]

At line num 20
i.e., ZipFile zip=new ZipFile("ftp://username:pswd@x xx.xx.xxx.xx/location");

Why don't use a ZipInputStream as explained here.

[vikasini]

Why don't use a ZipInputStream as explained here.

I tried with the ZipInputStream also. Still the same exception occurs

[Nepomuk]

I tried with the ZipInputStream also. Still the same exception occurs

Is it an external file you're accessing? If so, I guess, you'd have to download the class to your server, unzip it there and then send it to the client. It's the same, when you want to open a file from the web on your computer - you have to download it first.
If the file is local, access it in a local way. That's much easier than all of this ftp stuff.

Greetings,
Nepomuk

[vikasini]

Is it an external file you're accessing? If so, I guess, you'd have to download the class to your server, unzip it there and then send it to the client. It's the same, when you want to open a file from the web on your computer - you have to download it first.
If the file is local, access it in a local way. That's much easier than all of this ftp stuff.

Greetings,
Nepomuk

Yes it's an external file that i am trying to access.
When i use it for a local file it works perfectly


Eg: ZipFile zip=new ZipFile("C:/filename.zip");

But it is not working for the FTP

So i tried using this way

URL zip=new URL("ftp://username:pswd@x xx.xx.xxx.xx/location/filename.zip");

But while trying to use this way it is not supporting the 'Enumeration' and the getInputStream( ) method

[Nepomuk]

Yes it's an external file that i am trying to access.
When i use it for a local file it works perfectly

Eg: ZipFile zip=new ZipFile("C:/filename.zip");

But it is not working for the FTP

So i tried using this way

URL zip=new URL("ftp://username:pswd@x xx.xx.xxx.xx/location/filename.zip");

But while trying to use this way it is not supporting the 'Enumeration' and the getInputStream( ) method

OK, seems you'll have to download it first. If you don't have ftp classes in your project already, have a look at the commons-net lib from Apache (or, if you choose to, any other ftp lib). With this, you can download your external file and as soon as it's local, you have the solution!

Greetings,
Nepomuk

[vikasini]

OK, seems you'll have to download it first. If you don't have ftp classes in your project already, have a look at the commons-net lib from Apache (or, if you choose to, any other ftp lib). With this, you can download your external file and as soon as it's local, you have the solution!

Greetings,
Nepomuk

I am not able to download the file even after i tried to use that.
The problem is with the URL method..
Is there any other way to alter the code to make it perfect

[r035198x]

I am not able to download the file even after i tried to use that.
The problem is with the URL method..
Is there any other way to alter the code to make it perfect

Perhaps you should go through a tutorial on how to copy a file over the network