Download a file from a URL in Java
Problem
You have a need to connect to a server and download a file within your Java program.
Solution
With the Java IO libraries we can create a socket connection to the server and download the file.
Detailed explanation
package com.adampresley.examples;
import java.net.*;
import java.io.*;
public class DownloadFile
{
public static void main(String[] args)
{
try
{
/*
* Get a connection to the URL and start up
* a buffered reader.
*/
long startTime = System.currentTimeMillis();
System.out.println("Connecting to Mura site...\n");
URL url = new URL("http://www.getmura.com/currentversion/");
url.openConnection();
InputStream reader = url.openStream();
/*
* Setup a buffered file writer to write
* out what we read from the website.
*/
FileOutputStream writer = new FileOutputStream("C:/mura-newest.zip");
byte[] buffer = new byte[153600];
int totalBytesRead = 0;
int bytesRead = 0;
System.out.println("Reading ZIP file 150KB blocks at a time.\n");
while ((bytesRead = reader.read(buffer)) > 0)
{
writer.write(buffer, 0, bytesRead);
buffer = new byte[153600];
totalBytesRead += bytesRead;
}
long endTime = System.currentTimeMillis();
System.out.println("Done. " + (new Integer(totalBytesRead).toString()) + " bytes read (" + (new Long(endTime - startTime).toString()) + " millseconds).\n");
writer.close();
reader.close();
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
+
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License. Permissions beyond the scope of this license, pertaining to the examples of code included within this work are available at Adobe.
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