public class CookieManager
extends CookieHandler

CookieManager provides a concrete implementation of CookieHandler, which separates the storage of cookies from the policy surrounding accepting and rejecting cookies. A CookieManager is initialized with a CookieStore which manages storage, and a CookiePolicy object, which makes policy decisions on cookie acceptance/rejection.

The HTTP cookie management in java.net package looks like:

use
 CookieHandler <------- HttpURLConnection
       ^
       | impl
       |         use
 CookieManager -------> CookiePolicy
             |   use
             |--------> HttpCookie
             |              ^
             |              | use
             |   use        |
             |--------> CookieStore
                            ^
                            | impl
                            |
                  Internal in-memory implementation

• CookieHandler is at the core of cookie management. User can call CookieHandler.setDefault to set a concrete CookieHanlder implementation to be used.
• CookiePolicy.shouldAccept will be called by CookieManager.put to see whether or not one cookie should be accepted and put into cookie store. User can use any of three pre-defined CookiePolicy, namely ACCEPT_ALL, ACCEPT_NONE and ACCEPT_ORIGINAL_SERVER, or user can define his own CookiePolicy implementation and tell CookieManager to use it.
• CookieStore is the place where any accepted HTTP cookie is stored in. If not specified when created, a CookieManager instance will use an internal in-memory implementation. Or user can implements one and tell CookieManager to use it.
• Currently, only CookieStore.add(URI, HttpCookie) and CookieStore.get(URI) are used by CookieManager. Others are for completeness and might be needed by a more sophisticated CookieStore implementation, e.g. a NetscapeCookieStore.

There're various ways user can hook up his own HTTP cookie management behavior, e.g.

• Use CookieHandler.setDefault to set a brand new CookieHandler implementation
• Let CookieManager be the default CookieHandler implementation, but implement user's own CookieStore and CookiePolicy and tell default CookieManager to use them:

  // this should be done at the beginning of an HTTP session
  CookieHandler.setDefault(new CookieManager(new MyCookieStore(), new MyCookiePolicy()));

• Let CookieManager be the default CookieHandler implementation, but use customized CookiePolicy:

  // this should be done at the beginning of an HTTP session
  CookieHandler.setDefault(new CookieManager());
  // this can be done at any point of an HTTP session
  ((CookieManager)CookieHandler.getDefault()).setCookiePolicy(new MyCookiePolicy());

The implementation conforms to RFC 2965, section 3.3.

Constructor Detail

CookieManager

public CookieManager()

Create a new cookie manager.

This constructor will create new cookie manager with default cookie store and accept policy. The effect is same as CookieManager(null, null).

CookieManager

public CookieManager​(CookieStore store,
                     CookiePolicy cookiePolicy)

Create a new cookie manager with specified cookie store and cookie policy.

Parameters:

store - a CookieStore to be used by cookie manager. if null, cookie manager will use a default one, which is an in-memory CookieStore implementation.

cookiePolicy - a CookiePolicy instance to be used by cookie manager as policy callback. if null, ACCEPT_ORIGINAL_SERVER will be used.

Method Detail

setCookiePolicy

public void setCookiePolicy​(CookiePolicy cookiePolicy)

To set the cookie policy of this cookie manager.

A instance of CookieManager will have cookie policy ACCEPT_ORIGINAL_SERVER by default. Users always can call this method to set another cookie policy.

Parameters:

cookiePolicy - the cookie policy. Can be null, which has no effects on current cookie policy.

getCookieStore

public CookieStore getCookieStore()

To retrieve current cookie store.

Returns:

the cookie store currently used by cookie manager.