public abstract class ProxySelector extends Object
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.
Constructor | Description |
---|---|
ProxySelector() |
Constructor for subclasses to call. |
Modifier and Type | Method | Description |
---|---|---|
abstract void |
connectFailed |
Called to indicate that a connection could not be established to a proxy/socks server. |
static ProxySelector |
getDefault() |
Gets the system-wide proxy selector. |
static ProxySelector |
of |
Returns a ProxySelector which uses the given proxy address for all HTTP and HTTPS requests. |
abstract List |
select |
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 |
Sets (or unsets) the system-wide proxy selector. |
public ProxySelector()
public static ProxySelector getDefault()
ProxySelector
SecurityException
- If a security manager has been installed and it denies NetPermission
("getProxySelector")
public static void setDefault(ProxySelector ps)
ps
- The HTTP proxy selector, or null
to unset the proxy selector.SecurityException
- If a security manager has been installed and it denies NetPermission
("setProxySelector")
public abstract List<Proxy> select(URI uri)
socket://host:port
uri
- The URI that a connection is required toProxy
; when no proxy is available, the list will contain one element of type Proxy
that represents a direct connection.IllegalArgumentException
- if the argument is null or if the protocol or host cannot be determined from the provided uri
public abstract void connectFailed(URI uri, SocketAddress sa, IOException ioe)
select(URI)
, using the address and the IOException caught when trying to connect.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.IllegalArgumentException
- if either argument is nullpublic static ProxySelector of(InetSocketAddress proxyAddress)
null
then proxying is disabled.proxyAddress
- The address of the proxy
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/net/ProxySelector.html