Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class Naming - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.rmi
Class Naming

java.lang.Object
  |
  +--java.rmi.Naming

public final class Naming
extends Object

The Naming class provides methods for storing and obtaining references to remote objects in the remote object registry. The Naming class's methods take, as one of their arguments, a name that is URL formatted java.lang.String of the form:

    //host:port/name

where host is the host (remote or local) where the registry is located, port is the port number on which the registry accepts calls, and where name is a simple string uninterpreted by the registry. Both host and port are optional. If host is omitted, the host defaults to the local host. If port is omitted, then the port defaults to 1099, the "well-known" port that RMI's registry, rmiregistry, uses.

Binding a name for a remote object is associating or registering a name for a remote object that can be used at a later time to look up that remote object. A remote object can be associated with a name using the Naming class's bind or rebind methods.

Once a remote object is registered (bound) with the RMI registry on the local host, callers on a remote (or local) host can lookup the remote object by name, obtain its reference, and then invoke remote methods on the object. A registry may be shared by all servers running on a host or an individual server process may create and use its own registry if desired (see java.rmi.registry.LocateRegistry.createRegistry method for details).

Since:: JDK1.1
See Also:: Registry, LocateRegistry, LocateRegistry.createRegistry(int)

Method Summary

static void bind(String name, Remote obj)
          Binds the specified name to a remote object.

static String[] list(String name)
          Returns an array of the names bound in the registry.

static Remote lookup(String name)
          Returns a reference, a stub, for the remote object associated with the specified name.

static void rebind(String name, Remote obj)
          Rebinds the specified name to a new remote object.

static void unbind(String name)
          Destroys the binding for the specified name that is associated with a remote object.

Methods inherited from class java.lang.Object

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

Method Detail

lookup

public static Remote lookup(String name)
                     throws NotBoundException,
                            MalformedURLException,
                            RemoteException

Returns a reference, a stub, for the remote object associated with the specified name.

Parameters:: name - a URL-formatted name for the remote object
Returns:: a reference for a remote object
Throws:: NotBoundException - if name is not currently bound; RemoteException - if registry could not be contacted; AccessException - if this operation is not permitted (if originating from a non-local host, for example)
Since:: JDK1.1

bind

public static void bind(String name,
                        Remote obj)
                 throws AlreadyBoundException,
                        MalformedURLException,
                        RemoteException

Binds the specified name to a remote object.

Parameters:: name - a URL-formatted name for the remote object; obj - a reference for the remote object (usually a stub)
Throws:: AlreadyBoundException - if name is already bound; MalformedURLException - if the name is not an appropriately formatted URL; RemoteException - if registry could not be contacted; AccessException - if this operation is not permitted (if originating from a non-local host, for example)
Since:: JDK1.1

unbind

public static void unbind(String name)
                   throws RemoteException,
                          NotBoundException,
                          MalformedURLException

Destroys the binding for the specified name that is associated with a remote object.

Parameters:: name - a URL-formatted name associated with a remote object
Throws:: NotBoundException - if name is not currently bound; MalformedURLException - if the name is not an appropriately formatted URL; RemoteException - if registry could not be contacted; AccessException - if this operation is not permitted (if originating from a non-local host, for example)
Since:: JDK1.1

rebind

public static void rebind(String name,
                          Remote obj)
                   throws RemoteException,
                          MalformedURLException

Rebinds the specified name to a new remote object. Any existing binding for the name is replaced.

Parameters:: name - a URL-formatted name associated with the remote object; obj - new remote object to associate with the name
Throws:: MalformedURLException - if the name is not an appropriately formatted URL; RemoteException - if registry could not be contacted; AccessException - if this operation is not permitted (if originating from a non-local host, for example)
Since:: JDK1.1

list

public static String[] list(String name)
                     throws RemoteException,
                            MalformedURLException

Returns an array of the names bound in the registry. The names are URL-formatted strings. The array contains a snapshot of the names present in the registry at the time of the call.

Parameters:: name - a URL-formatted name that specifies the remote registry
Returns:: an array of names (in the appropriate URL format) bound in the registry
Throws:: MalformedURLException - if the name is not an appropriately formatted URL; RemoteException - if registry could not be contacted.
Since:: JDK1.1