#4 url engine

[Anonymous]

/**
this class makes a url connection with the specified url
*/

import java.io.*;
import java.net.*;
import java.util.*;

/**
this class adds all the readable data from sites to the textArea from where to read the file
*/

public class URLConnectionTest
{
public void getData(String urlName)
{
PlayerModelImpl playerImpl = new PlayerModelImpl();
try
{

 /\*\*
  \* making an instance of url  
  \*/

URL url = new URL(urlName);

/**
* opening the urlConnection
* this is the beauty of url class we don't have to explicitly
* use sockets url class handles all the other things
*/

URLConnection connection = url.openConnection();

connection.connect();

// print header fields

int n = 1;
String key;
while ((key = connection.getHeaderFieldKey(n)) != null)
{
String value = connection.getHeaderField(n);
System.out.println(key + ": " + value);
n++;
}

// print convenience functions

System.out.println("----------");
System.out.println("getContentType: "
+ connection.getContentType());
System.out.println("getContentLength: "
+ connection.getContentLength());
System.out.println("getContentEncoding: "
+ connection.getContentEncoding());
System.out.println("getDate: "
+ connection.getDate());
System.out.println("getExpiration: "
+ connection.getExpiration());
System.out.println("getLastModifed: "
+ connection.getLastModified());
System.out.println("----------");

BufferedReader in = new BufferedReader(new
InputStreamReader(connection.getInputStream()));

playerImpl.setTextInTextArea(connection.getInputStream(), connection.getContentLength());
// print first ten lines of contents

String line;
n = 1;;
while ((line = in.readLine()) != null )
{
System.out.println(line);
n++;
}
if (line != null) System.out.println(". . .");
}
catch (IOException exception)
{
exception.printStackTrace();
}
}

/**
Computes the Base64 encoding of a string
@param s a string
@return the Base 64 encoding of s
*/
public static String base64Encode(String s)
{
ByteArrayOutputStream bOut
= new ByteArrayOutputStream();
Base64OutputStream out = new Base64OutputStream(bOut);
try
{
out.write(s.getBytes());
out.flush();
}
catch (IOException exception)
{
}
return bOut.toString();
}
}

/**
This stream filter converts a stream of bytes to their
Base64 encoding.

Base64 encoding encodes 3 bytes into 4 characters.
|11111122|22223333|33444444|
Each set of 6 bits is encoded according to the
toBase64 map. If the number of input bytes is not
a multiple of 3, then the last group of 4 characters
is padded with one or two = signs. Each output line
is at most 76 characters.
*/
class Base64OutputStream extends FilterOutputStream
{
/**
Constructs the stream filter
@param out the stream to filter
*/
public Base64OutputStream(OutputStream out)
{
super(out);
}

public void write(int c) throws IOException
{
inbuf[i] = c;
i++;
if (i == 3)
{
super.write(toBase64[(inbuf[0] & 0xFC) >> 2]);
super.write(toBase64[((inbuf[0] & 0x03) << 4) |
((inbuf[1] & 0xF0) >> 4)]);
super.write(toBase64[((inbuf[1] & 0x0F) << 2) |
((inbuf[2] & 0xC0) >> 6)]);
super.write(toBase64[inbuf[2] & 0x3F]);
col += 4;
i = 0;
if (col >= 76)
{
super.write('\n');
col = 0;
}
}
}

public void flush() throws IOException
{
if (i == 1)
{
super.write(toBase64[(inbuf[0] & 0xFC) >> 2]);
super.write(toBase64[(inbuf[0] & 0x03) << 4]);
super.write('=');
super.write('=');
}
else if (i == 2)
{
super.write(toBase64[(inbuf[0] & 0xFC) >> 2]);
super.write(toBase64[((inbuf[0] & 0x03) << 4) |
((inbuf[1] & 0xF0) >> 4)]);
super.write(toBase64[(inbuf[1] & 0x0F) << 2]);
super.write('=');
}
}

private static char[] toBase64 =
{
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '+', '/'
};

private int col = 0;
private int i = 0;
private int[] inbuf = new int[3];

}