Quoted printable characters are encoded in the format =XX', where XX’ stands for the hexadecimal value of the character.
The encoder looks as follows:
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import java.io.UnsupportedEncodingException; import java.util.logging.Level; import java.util.logging.Logger; /** * It encodes data into quoted printable format. * * @author Daoyuan Li */ public class QuotedPrintableEncoder { /** * Encodes data into quoted printable format. * @param s Data to be encoded. * @return The encoded data. */ public String encode(String s) { byte[] b = null; try { b = s.getBytes("ISO-8859-1"); } catch (UnsupportedEncodingException ex) { Logger.getLogger(Mail.class.getName()).log(Level.SEVERE, null, ex); return ""; } String code = ""; int wc = 0; for (int i = 0; i < b.length; i++) { byte c = b[i]; if(c == 13){ code = code.concat("\n"); wc = 0; continue; } else if(c == 10) { //do nothing continue; } code = code.concat("=" + Integer.toHexString(c &255).toUpperCase()); wc += 3; if (wc >= 75) { code = code.concat("=\n"); wc = 0; } } return code; } /** * Encodes data into quoted printable format, without soft line breaks. * @param s Data to be encoded. * @return The encoded data. */ public String encodeWithoutLineBreak(String s) { byte[] b = null; try{ b = s.getBytes("ISO-8859-1"); } catch (UnsupportedEncodingException ex) { Logger.getLogger(Mail.class.getName()).log(Level.SEVERE, null, ex); return ""; } String code = ""; for (int i = 0; i < b.length; i++) { byte c = b[i]; if(c == 13){ code = code.concat("\n"); continue; } else if (c == 10){ //do nothing continue; } code = code.concat("=" + Integer.toHexString(c & 255).toUpperCase()); } return code; } } |
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