CookieHandler (Java Platform SE 8 )
Keywords: java.net.CookieHandler class
Date: 2015-05-24

compact1, compact2, compact3
java.net

## Class CookieHandler

- java.lang.Object
- - java.net.CookieHandler

- Direct Known Subclasses:
    CookieManager

      public abstract class CookieHandler
      extends Object

  A CookieHandler object provides a callback mechanism to hook up a HTTP state management policy implementation into the HTTP protocol handler. The HTTP state management mechanism specifies a way to create a stateful session with HTTP requests and responses.

  A system-wide CookieHandler that to used by the HTTP protocol handler can be registered by doing a CookieHandler.setDefault(CookieHandler). The currently registered CookieHandler can be retrieved by calling CookieHandler.getDefault(). For more information on HTTP state management, see RFC 2965: HTTP State Management Mechanism

  Since:
    1.5

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `CookieHandler()`

  - ### Method Summary

    All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract Map<String,List<String>>` | `get(URI uri, Map<String,List<String>> requestHeaders)` Gets all the applicable cookies from a cookie cache for the specified uri in the request header.
    `static CookieHandler` | `getDefault()` Gets the system-wide cookie handler.
    `abstract void` | `put(URI uri, Map<String,List<String>> responseHeaders)` Sets all the applicable cookies, examples are response header fields that are named Set-Cookie2, present in the response headers into a cookie cache.
    `static void` | `setDefault(CookieHandler cHandler)` Sets (or unsets) the system-wide cookie handler.

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

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

- - ### Constructor Detail

    - #### CookieHandler

          public CookieHandler()

  - ### Method Detail

    - #### getDefault

          public static CookieHandler getDefault()

      Gets the system-wide cookie handler.
      Returns:
        the system-wide cookie handler; A null return means there is no system-wide cookie handler currently set.
      Throws:
        `SecurityException` - If a security manager has been installed and it denies `NetPermission``("getCookieHandler")`
      See Also:
        `setDefault(CookieHandler)`

    - #### setDefault

          public static void setDefault(CookieHandler cHandler)

      Sets (or unsets) the system-wide cookie handler. Note: non-standard http protocol handlers may ignore this setting.
      Parameters:
        `cHandler` - The HTTP cookie handler, or `null` to unset.
      Throws:
        `SecurityException` - If a security manager has been installed and it denies `NetPermission``("setCookieHandler")`
      See Also:
        `getDefault()`

    - #### get

          public abstract Map<String,List<String>> get(URI uri,
                                                       Map<String,List<String>> requestHeaders)
                                                throws IOException

      Gets all the applicable cookies from a cookie cache for the specified uri in the request header.

      The `URI` passed as an argument specifies the intended use for the cookies. In particular the scheme should reflect whether the cookies will be sent over http, https or used in another context like javascript. The host part should reflect either the destination of the cookies or their origin in the case of javascript.

      It is up to the implementation to take into account the `URI` and the cookies attributes and security settings to determine which ones should be returned.

      HTTP protocol implementers should make sure that this method is called after all request headers related to choosing cookies are added, and before the request is sent.

      Parameters:
        `uri` - a `URI` representing the intended use for the cookies
        `requestHeaders` - - a Map from request header field names to lists of field values representing the current request headers
      Returns:
        an immutable map from state management headers, with field names "Cookie" or "Cookie2" to a list of cookies containing state information
      Throws:
        `IOException` - if an I/O error occurs
        `IllegalArgumentException` - if either argument is null
      See Also:
        `put(URI, Map)`

    - #### put

          public abstract void put(URI uri,
                                   Map<String,List<String>> responseHeaders)
                            throws IOException

      Sets all the applicable cookies, examples are response header fields that are named Set-Cookie2, present in the response headers into a cookie cache.
      Parameters:
        `uri` - a `URI` where the cookies come from
        `responseHeaders` - an immutable map from field names to lists of field values representing the response header fields returned
      Throws:
        `IOException` - if an I/O error occurs
        `IllegalArgumentException` - if either argument is null
      See Also:
        `get(URI, Map)`

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