␡
- A Refresher
- The Servlet Class: TransformData
- Helper Class: URLDecoder
- Main Transformation Class: FormDataToXML
- Conclusion
Like this article? We recommend
Like this article? We recommend
Like this article? We recommend
Like this article? We recommend
Helper Class: URLDecoder
Before we discuss the implementation of FormDataToXML.class, which is the main transformation component, we must discuss a helper class URLDecoder, which is used to process the URLEncoded values in the Query String, as was discussed earlier.
/**
* URLDecoder
*
* @Author Jasmit Singh Kochhar
*
* @Date Created 08/2001
*
* @Purpose This class is used to decode URLencoded strings.
* Turns x-www-form-urlencoded format Strings into a standard
* string of text.
*
*/
import java.io.ByteArrayOutputStream;
public class URLDecoder {
static byte hex_conversion[] = null;
static
{
hex_conversion = new byte[256];
int i;
byte j;
for ( i = 0; i < 256; i++ )
hex_conversion[i] = 0;
for ( i='0', j=0; i <= '9';i++,j++ )
hex_conversion[i] = j;
for ( i='A', j=10; i <= 'F';i++,j++ )
hex_conversion[i] = j;
for ( i='a', j=10; i <= 'f';i++,j++ )
hex_conversion[i] = j;
}
private URLDecoder() { }
/**
* Method: decode
*
* @Purpose Translates x-www-form-urlencoded formatted String
* into a standard String.
* @param s String to be translated
* @return the translated String.
*/
public static String decode(String s)
{
if ( s == null ) return s;
ByteArrayOutputStream out = new ByteArrayOutputStream(s.length());
int hex_mode = 0;
int nibble_storage = 0;
for_loop:
for (int i = 0; i < s.length(); i++)
{ char c = s.charAt(i);
switch(hex_mode)
{
case 0:
if (c == '%')
{ hex_mode = 1; // get high nibble
continue for_loop;
}
if (c == '+')
c = ' ';
break;
case 1:
nibble_storage = hex_conversion[c] << 4;
hex_mode = 2;
continue for_loop;
case 2:
c = (char) (nibble_storage | (0xf & hex_conversion[c]));
hex_mode = 0;
break;
}
out.write(c);
}
return out.toString();
}
}