# Package javax.smartcardio

Java™ Smart Card I/O API

See: Description

- Class Summary
  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.
  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.
  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.

- Enum Summary
  Enum | Description
  --- | ---
  CardTerminals.State | Enumeration of attributes of a CardTerminal.

- Exception Summary
  Exception | Description
  --- | ---
  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.

## Package javax.smartcardio Description

## 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