public
abstract
class
ProxySelector
extends Object
| java.lang.Object | |
| ↳ | java.net.ProxySelector |
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.
The default proxy selector does enforce a set of System Properties related to proxy settings.
Public constructors | |
|---|---|
ProxySelector()
|
|
Public methods | |
|---|---|
abstract
void
|
connectFailed(URI uri, SocketAddress sa, IOException ioe)
Called to indicate that a connection could not be established to a proxy/socks server. |
static
ProxySelector
|
getDefault()
Gets the system-wide proxy selector. |
abstract
List<Proxy>
|
select(URI uri)
Selects all the applicable proxies based on the protocol to access the resource with and a destination address to access the resource at. |
static
void
|
setDefault(ProxySelector ps)
Sets (or unsets) the system-wide proxy selector. |
Inherited methods | |
|---|---|
 From
class
java.lang.Object
| |
void connectFailed (URI uri, SocketAddress sa, IOException ioe)
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(URI), using the address
and the IOException caught when trying to connect.
| Parameters | |
|---|---|
uri |
URI:
The URI that the proxy at sa failed to serve. |
sa |
SocketAddress:
The socket address of the proxy/SOCKS server |
ioe |
IOException:
The I/O exception thrown when the connect failed. |
| Throws | |
|---|---|
IllegalArgumentException |
if either argument is null |
ProxySelector getDefault ()
Gets the system-wide proxy selector.
| Returns | |
|---|---|
ProxySelector |
the system-wide ProxySelector |
| Throws | |
|---|---|
SecurityException |
If a security manager has been installed and it denies
NetPermission("getProxySelector") |
See also:
List<Proxy> select (URI uri)
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:
Developers
socket://host:port| Parameters | |
|---|---|
uri |
URI:
The URI that a connection is required to |
| Returns | |
|---|---|
List<Proxy> |
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 the argument is null |
void setDefault (ProxySelector ps)
Sets (or unsets) the system-wide proxy selector. Note: non-standard protocol handlers may ignore this setting.
| Parameters | |
|---|---|
ps |
ProxySelector:
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") |
See also: