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 callinggetDefault method. When a proxy selector is registered, for instance, a subclass of URLConnection class should call theselect method for each URL request so that the proxy selector can decide if a direct, or proxied connection should be used. Theselect 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'sconnectFailed method to notify the proxy selector that the proxy server is unavailable.
The default proxy selector does enforce aset of System Properties related to proxy settings.
- Since:
- 1.5
Constructor Summary
ConstructorsMethod Summary
Modifier and TypeMethodDescriptionabstract voidconnectFailed(URI uri,SocketAddress sa,IOException ioe) Called to indicate that a connection could not be established to a proxy/socks server.staticProxySelectorGets the system-wide proxy selector.staticProxySelectorof(InetSocketAddress proxyAddress) Returns a ProxySelector which uses the given proxy address for all HTTP and HTTPS requests.Selects all the applicable proxies based on the protocol to access the resource with and a destination address to access the resource at.static voidSets (or unsets) the system-wide proxy selector.
Constructor Details
ProxySelector
public ProxySelector()Constructor for subclasses to call.
Method Details
getDefault
Gets the system-wide proxy selector.- Returns:
- the system-wide
ProxySelector - Throws:
SecurityException- If a security manager has been installed and it deniesNetPermission("getProxySelector")- Since:
- 1.5
- See Also:
setDefault
Sets (or unsets) the system-wide proxy selector. Note: non-standard protocol handlers may ignore this setting.- Parameters:
ps- The HTTP proxy selector, ornullto unset the proxy selector.- Throws:
SecurityException- If a security manager has been installed and it deniesNetPermission("setProxySelector")- Since:
- 1.5
- See Also:
select
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 follows:- http URI for http connections
- https URI for https connections
socket://host:port
for tcp client sockets connections
- Parameters:
uri- The URI that a connection is required to- Returns:
- a List of Proxies. Each element in the List is of type
Proxy; when no proxy is available, the list will contain one element of typeProxythat represents a direct connection. - Throws:
IllegalArgumentException- if the argument is null or if the protocol or host cannot be determined from the provideduri
connectFailed
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 byselect(URI), using the address and the IOException caught when trying to connect.- Parameters:
uri- The URI that the proxy at sa failed to serve.sa- The socket address of the proxy/SOCKS serverioe- The I/O exception thrown when the connect failed.- Throws:
IllegalArgumentException- if either argument is null
of
Returns a ProxySelector which uses the given proxy address for all HTTP and HTTPS requests. IfproxyAddressisnullthen proxying is disabled.- Parameters:
proxyAddress- The address of the proxy- Returns:
- a ProxySelector
- Since:
- 9