Thread: Downloading file from website and saving it locally.

Hello friends...

I'm currently struggling with this code:

import java.awt.FlowLayout;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
 
public class trying extends JFrame
{
	public static final void main(String[] args) throws Exception, FileNotFoundException
	{
		String site="http://example.com/c/example/aps/example.exe";
		String filename="example.exe";
		JFrame frm=new JFrame();
		JProgressBar current = new JProgressBar(0, 100);
		current.setSize(50,50);
		current.setValue(43);
		current.setStringPainted(true);
		frm.add(current);
		frm.setVisible(true);
		frm.setLayout(new FlowLayout());
		frm.setSize(400, 100);
		frm.setDefaultCloseOperation(EXIT_ON_CLOSE);
		try {
			URL url=new URL(site);
			HttpURLConnection connection =
					(HttpURLConnection) url.openConnection();
			int filesize = connection.getContentLength();
			float totalDataRead=0;
			java.io.BufferedInputStream in = new java.io.BufferedInputStream(connection.getInputStream());
			java.io.FileOutputStream fos = new java.io.FileOutputStream(filename);
			java.io.BufferedOutputStream bout = new BufferedOutputStream(fos,1024);
			byte[] data = new byte[1024];
			int i=0;
			while((i=in.read(data,0,1024))>=0)
			{
				totalDataRead=totalDataRead+i;
				bout.write(data,0,i);
				float Percent=(totalDataRead*100)/filesize;
				current.setValue((int)Percent);
			}  
			bout.close();
			in.close();
		}
		catch(Exception e)
		{
			javax.swing.JOptionPane.showConfirmDialog((java.awt.Component)
					null,e.getMessage(), "Error",
					javax.swing.JOptionPane.DEFAULT_OPTION);
		}
	}
}

This program will (is supposed to) download an executable or any file wherever is located, if i place it in the desktop, works fine, documents, still working.

But this program to work for we, it needs to be in this path: "C:\Windows\System32\drivers\etc"

When I run it, it says "access denied" and I'm the administrator and every permission is fine; is there any way that java will just ignore any permissions and just put the file where I want it to be?

Thanks and I hope you guys can help.

Can you tell me, if you have an idea on how can I tell the OS that it is okay to update?

Cant find any information... Is there any other ideas? How can I modify this code to save to the local temp folder...?

--- Update ---

I'm working on windows...

Originally Posted by Norm

I'm not sure how to get a path to "the local temp folder". Is there a system path to it?
Print out the system properties to see if java has a path to it:

      Properties props = System.getProperties();
     props.list(System.out);

String default_tmp = System.getProperty("java.io.tmpdir");
System.out.println(default_tmp);

This should result in something similar to:
C:\Users\Jos\AppData\Local\Temp\