ValidatingHttpRequest.java

// Return HTML Entity code equivalents for any special characters
    public static String HTMLEntityEncode( String input ) {

        StringBuffer sb = new StringBuffer();

        for ( int i = 0; i < input.length(); ++i ) {

            char ch = input.charAt( i );

            if ( ch>='a' && ch<='z' || ch>='A' && ch<='Z' || ch>='0' && ch<='9' ) {
                sb.append( ch );
            } else {
                sb.append( "&#" + (int)ch + ";" );
            }
        }
        return sb.toString();
    }