String encoding issue, please help. Thanks

[xu200074212]

In my case, field 61(Type LLLVAR) used for storing the name of card owner, which is encoded in GBK, not utf-8.
while parsing response, class LlvarParseInfo decode the field value like this
line 66: _v = new String(buf, pos + 2, buf.length-pos-2, getCharacterEncoding()).substring(0, length);
line 100: T dec = custom.decodeField(new String(buf, pos + 1, length, getCharacterEncoding()));

The first issue : how to configure the CharacterEncoding for some certain field?

I use the reflect class to change CharacterEncoding of the field 61:

MessageFactory messageFactory =ConfigManager.getInstance().getMessageFactory();
Field [] fields = MessageFactory.class.getDeclaredFields();
Field f = Iterables.find(Arrays.asList(fields), new Predicate<Field>(){
@Override
public boolean apply(Field input) {
return input.getName().equals("parseMap");
}
});
try {
f.setAccessible(true);
Map<Integer, Map<Integer,="" FieldParseInfo="">> parseMap = (Map<Integer, Map<Integer,="" FieldParseInfo="">>) f.get(messageFactory);
parseMap.get(0x0210).get(Integer.valueOf(61)).setCharacterEncoding("GBK");
} catch (Exception e1) {
e1.printStackTrace();
}
but while running at Line64
//This is new: if the String's length is different from the specified length in the buffer,
//there are probably some extended characters. So we create a String from the rest of the buffer,
//and then cut it to the specified length.
if (_v.length() != length) {
_v = new String(buf, pos + 3, buf.length-pos-3, getCharacterEncoding()).substring(0, length);
}
the specified length is 67, _v.length is 66. After reading one more byte, the whole parsing going into the wrong way.

The second issue : It seems IsoValue would hava a property(byte []?) to store the binary data, and let the app layer to handle String decode stuff

sdk : jdk 6.0 + j8583 1.8.0
Field 61 value(HEX):
30363720202020202020202020202020202020202020202020202020202020202020204355504E4D2AC8FD202020202020202020202020202020202020202020202020202020

[Enrique Zamudio Lopez]

You can set the encoding for a field using setCharacterEncoding() you just need to find the name for GBK encoding.

To handle binary values (byte arrays) you can use LLBIN, LLLBIN and BINARY, which are the byte[] equivalents of LLVAR, LLLVAR and ALPHA.