java.net
abstract public class: ProxySelector [javadoc |
source]
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.
- author:
Yingxian - Wang
- author:
Jean-Christophe - Collet
- since:
1.5 -
| Methods from java.lang.Object: |
|---|
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Method from java.net.ProxySelector Detail: |
|---|
 abstract public 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. |
 public static ProxySelector getDefault() {
try {
Class c = Class.forName("sun.net.spi.DefaultProxySelector");
if (c != null && ProxySelector.class.isAssignableFrom(c)) {
theProxySelector = (ProxySelector) c.newInstance();
}
} catch (Exception e) {
theProxySelector = null;
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(SecurityConstants.GET_PROXYSELECTOR_PERMISSION);
}
return theProxySelector;
}
Gets the system-wide proxy selector. |
abstract public List 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:
- http URI for http connections
- https URI for https connections
- ftp URI for ftp connections
socket://host:port
for tcp client sockets connections |
public static void setDefault(ProxySelector ps) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(SecurityConstants.SET_PROXYSELECTOR_PERMISSION);
}
theProxySelector = ps;
} Sets (or unsets) the system-wide proxy selector.
Note: non-standard protocol handlers may ignore this setting. |
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