Authenticator (JavaMail API documentation)
Date: 2016-12-03

javax.mail

## Class Authenticator

- java.lang.Object
- - javax.mail.Authenticator

-     public abstract class Authenticator
      extends java.lang.Object

  The class Authenticator represents an object that knows how to obtain authentication for a network connection. Usually, it will do this by prompting the user for information.

  Applications use this class by creating a subclass, and registering an instance of that subclass with the session when it is created. When authentication is required, the system will invoke a method on the subclass (like getPasswordAuthentication). The subclass's method can query about the authentication being requested with a number of inherited methods (getRequestingXXX()), and form an appropriate message for the user.

  All methods that request authentication have a default implementation that fails.

  See Also:
    `Authenticator`, `Session.getInstance(java.util.Properties, javax.mail.Authenticator)`, `Session.getDefaultInstance(java.util.Properties, javax.mail.Authenticator)`, `Session.requestPasswordAuthentication(java.net.InetAddress, int, java.lang.String, java.lang.String, java.lang.String)`, `PasswordAuthentication`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `Authenticator()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected java.lang.String` | `getDefaultUserName()`
    `protected PasswordAuthentication` | `getPasswordAuthentication()` Called when password authentication is needed.
    `protected int` | `getRequestingPort()`
    `protected java.lang.String` | `getRequestingPrompt()`
    `protected java.lang.String` | `getRequestingProtocol()` Give the protocol that's requesting the connection.
    `protected java.net.InetAddress` | `getRequestingSite()`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Authenticator

          public Authenticator()

  - ### Method Detail

    - #### getRequestingSite

          protected final java.net.InetAddress getRequestingSite()

      Returns:
        the InetAddress of the site requesting authorization, or null if it's not available.

    - #### getRequestingPort

          protected final int getRequestingPort()

      Returns:
        the port for the requested connection

    - #### getRequestingProtocol

          protected final java.lang.String getRequestingProtocol()

      Give the protocol that's requesting the connection. Often this will be based on a URLName.
      Returns:
        the protcol
      See Also:
        `URLName.getProtocol()`

    - #### getRequestingPrompt

          protected final java.lang.String getRequestingPrompt()

      Returns:
        the prompt string given by the requestor

    - #### getDefaultUserName

          protected final java.lang.String getDefaultUserName()

      Returns:
        the default user name given by the requestor

    - #### getPasswordAuthentication

          protected PasswordAuthentication getPasswordAuthentication()

      Called when password authentication is needed. Subclasses should override the default implementation, which returns null.

      Note that if this method uses a dialog to prompt the user for this information, the dialog needs to block until the user supplies the information. This method can not simply return after showing the dialog.

      Returns:
        The PasswordAuthentication collected from the user, or null if none is provided.

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