java.net.ProxySelector

public abstract class java.net

ProxySelector

Java SE 6

Selects the proxy server to use, if any, when connecting to the network resource referenced by a URL. A proxy selector is a concrete sub-class of this class and is registered by invoking the setDefault method. The currently registered proxy selector can be retrieved by calling getDefault method.

When a proxy selector is registered, for instance, a subclass of URLConnection class should call the select method for each URL request so that the proxy selector can decide if a direct, or proxied connection should be used. The select method returns an iterator over a collection with the preferred connection approach.

If a connection cannot be established to a proxy (PROXY or SOCKS) servers then the caller should call the proxy selector's connectFailed method to notify the proxy selector that the proxy server is unavailable.

version	1.3, 03/08/09
since	1.5

Constructors

public

ProxySelector()

Methods

abstract public void

connectFailed(URI uri, SocketAddress sa, IOException ioe) Details

Called to indicate that a connection could not be established to a proxy/socks server. An implementation of this method can temporarily remove the proxies or reorder the sequence of proxies returned by select(String, String), using the address and they kind of IOException given.

uri	The URI that the proxy at sa failed to serve.
sa	The socket address of the proxy/SOCKS server
ioe	The I/O exception thrown when the connect failed.
Throws	IllegalArgumentException: if either argument is null

abstract public List

select(URI uri) Details

Selects all the applicable proxies based on the protocol to access the resource with and a destination address to access the resource at. The format of the URI is defined as follow:

http URI for http connections
https URI for https connections
ftp URI for ftp connections
socket://host:port
for tcp client sockets connections

uri	The URI that a connection is required to
return	a List of Proxies. Each element in the the List is of type `Proxy`; when no proxy is available, the list will contain one element of type `Proxy` that represents a direct connection.
Throws	IllegalArgumentException: if either argument is null

Properties

public static void

setDefault(ProxySelector ps) Details

Sets (or unsets) the system-wide proxy selector. Note: non-standard protocol handlers may ignore this setting.

ps	The HTTP proxy selector, or `null` to unset the proxy selector.
Throws	SecurityException: If a security manager has been installed and it denies `NetPermission("setProxySelector")`
since	1.5
See also	getDefault()

public static ProxySelector

getDefault() Details

Gets the system-wide proxy selector.

Throws	SecurityException: If a security manager has been installed and it denies `NetPermission("getProxySelector")`
return	the system-wide `ProxySelector`
since	1.5
See also	setDefault(ProxySelector)

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Java SE 6