# Package javax.smartcardio

package javax.smartcardio
Java™ Smart Card I/O API. This specification describes the Java Smart Card I/O API defined by JSR 268. It defines a Java API for communication with Smart Cards using ISO/IEC 7816-4 APDUs. It thereby allows Java applications to interact with applications running on the Smart Card, to store and retrieve data on the card, etc.

The API is defined by classes in the package `javax.smartcardio`. They can be classified as follows:

Classes describing the corresponding Smart Card structures
  ATR, CommandAPDU, ResponseAPDU
Factory to obtain implementations
  TerminalFactory
Main classes for card and terminal functions
  CardTerminals, CardTerminal, Card, CardChannel
Supporting permission and exception classes
  CardPermission, CardException, CardNotPresentException
Service provider interface, not accessed directly by applications
  TerminalFactorySpi

## API Example

A simple example of using the API is:

         // show the list of available terminals
         TerminalFactory factory = TerminalFactory.getDefault();
         List<CardTerminal> terminals = factory.terminals().list();
         System.out.println("Terminals: " + terminals);
         // get the first terminal
         CardTerminal terminal = terminals.get(0);
         // establish a connection with the card
         Card card = terminal.connect("T=0");
         System.out.println("card: " + card);
         CardChannel channel = card.getBasicChannel();
         ResponseAPDU r = channel.transmit(new CommandAPDU(c1));
         System.out.println("response: " + toString(r.getBytes()));
         // disconnect
         card.disconnect(false);

Since:
  1.6

Class
Description
ATR
A Smart Card's answer-to-reset bytes.
Card
A Smart Card with which a connection has been established.
CardChannel
A logical channel connection to a Smart Card.
CardException
Exception for errors that occur during communication with the Smart Card stack or the card itself.
CardNotPresentException
Exception thrown when an application tries to establish a connection with a terminal that has no card present.
CardPermission
A permission for Smart Card operations.
CardTerminal
A Smart Card terminal, sometimes referred to as a Smart Card Reader.
CardTerminals
The set of terminals supported by a TerminalFactory.
CardTerminals.State
Enumeration of attributes of a CardTerminal.
CommandAPDU
A command APDU following the structure defined in ISO/IEC 7816-4.
ResponseAPDU
A response APDU as defined in ISO/IEC 7816-4.
TerminalFactory
A factory for CardTerminal objects.
TerminalFactorySpi
The TerminalFactorySpi class defines the service provider interface.