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 and Description | 
|---|
| ProxySelector() | 
| Modifier and Type | Method and Description | 
|---|---|
| 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. | 
public static ProxySelector getDefault()
ProxySelectorSecurityException - If a security manager has been installed and it denies
 NetPermission("getProxySelector")setDefault(ProxySelector)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")getDefault()public abstract List<Proxy> select(URI uri)
socket://host:porturi - 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 nullpublic 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 null Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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