Downloading Files with java

eh. I've spent it for too long. actually, it's not that kinda hard.
Simply, what I want to do is downloading a file from web server. it's also known as "Socket Programming" . Python, Java , C , C++ and so forth has that network part. Mostly, Python and Java is a famous for socket programming.

I've to do it with java due to the requirements.

Okay. Let's see. it's simple .

First of all, I've created a URL

URL url = new URL("http://localhost/epub/");

Then open the URL connection and check the condition ,

URLConnection urlCon = url.openConnection();
        HttpURLConnection con = null;
        if (urlCon instanceof HttpURLConnection) {
            con = (HttpURLConnection) urlCon;
        } else {
            System.out.println("Enter URL");
            return;
        }

Anyway, downloading files through URL is also I/O . Thus, we'd use FileOutPutStream, BufferInputStream and others. Declare a BufferInputStream first. pass the URL to it and open it.

java.io.BufferedInputStream in = new java.io.BufferedInputStream(new java.net.URL("http://localhost/epub/").openStream());

Create a FileOutPutStream to get the file and you can name the out coming file as you like . Define BufferOutPutStream and Buffer Size in Bytes , check the condition. Then close all connection.

        java.io.FileOutputStream fos = new java.io.FileOutputStream("mgpyone");
        java.io.BufferedOutputStream bout = new BufferedOutputStream(fos,1024);
        byte[] data = new byte[102400];
        int x = 0; 
        while ((x = in.read(data, 0, 102400)) >= 0) {
            bout.write(data, 0, x);
        }
        bout.close();
        in.close();  

Then, That's all. Take a look at full code.

package url;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

/**
 *
 * @author yelinaung
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        URL url = new URL("http://localhost/epub/");
        URLConnection urlCon = url.openConnection();
        HttpURLConnection con = null;
        if (urlCon instanceof HttpURLConnection) {
            con = (HttpURLConnection) urlCon;
        } else {
            System.out.println("Enter URL");
            return;
        }
        java.io.BufferedInputStream in = new java.io.BufferedInputStream(new java.net.URL("http://localhost/epub/").openStream());
        java.io.FileOutputStream fos = new java.io.FileOutputStream("mgpyone");
        java.io.BufferedOutputStream bout = new BufferedOutputStream(fos,1024);
        byte[] data = new byte[102400];
        int x = 0; 
        while ((x = in.read(data, 0, 102400)) >= 0) {
            bout.write(data, 0, x);
        }
        bout.close();
        in.close();
    }
}

Have Fun !