The charset of the form page is ISO-8859-15'. HTTP will encode the form message in URLEncoding, that is, space is replaced with +’; non-ASCII characters are encoded inthe format %XX', where XX’ stands for the hexadecimal value of the character.
The URL decoder in this system looks as follows:
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importjava.io.UnsupportedEncodingException; import java.util.Vector; import java.util.logging.Level; import java.util.logging.Logger; /** * UrlDecoder decodes URL encoded information into quoted printable characters. * * @author Daoyuan Li */ public class UrlDecoder { /** * Decode from URL encoding to quoted printable. * @param url URL encoded message to be decoded. * @return Decoded quoted printable string. * @throwsException If anything wrong happens, an Exception is thrown. */ public String decode(String url) throws Exception { String decoded = ""; Exception ex = new Exception(); Vector buf = new Vector(); for (int i = 0; i < url.length(); i++) { if (url.charAt(i) == '%') { if (i + 2 >= url.length()) { throw ex; } int d = -1; try { d = Integer.parseInt(url.substring(i + 1, i + 3), 16); } catch (NumberFormatException e) { throw ex; } if (d > 255 || d < 0) { throw ex; } buf.add(new Byte((byte)d)); i += 2; } else if (url.charAt(i) == '+') { buf.add(new Byte((byte)' ')); } else { buf.add(new Byte((byte) url.charAt(i))); } } try { byte[] dcd = new byte[buf.size()]; for (int j = 0; j < dcd.length; j++) { dcd[j] = buf.elementAt(j); } decoded = new String(dcd, "ISO-8859-1"); } catch (UnsupportedEncodingException e) { Logger.getLogger(FormValidator.class.getName()).log(Level.SEVERE, null,e); throw ex; } return decoded; } } |
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