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.
- Since:
- 1.5
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Constructor SummaryConstructors
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Method SummaryModifier and TypeMethodDescriptionabstract voidconnectFailed(URI uri, SocketAddress sa, IOException ioe) Called to indicate that a connection could not be established to a proxy/socks server.static ProxySelectorGets the system-wide proxy selector.static ProxySelectorof(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.
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Constructor Details- 
ProxySelectorpublic ProxySelector()Constructor for subclasses to call.
 
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Method Details- 
getDefaultGets the system-wide proxy selector.- Returns:
- the system-wide ProxySelector
- Throws:
- SecurityException- If a security manager has been installed and it denies- NetPermission- ("getProxySelector")
- Since:
- 1.5
- See Also:
 
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setDefaultSets (or unsets) the system-wide proxy selector. Note: non-standard protocol handlers may ignore this setting.- Parameters:
- ps- The HTTP proxy selector, or- nullto unset the proxy selector.
- Throws:
- SecurityException- If a security manager has been installed and it denies- NetPermission- ("setProxySelector")
- Since:
- 1.5
- See Also:
 
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selectSelects 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 provided- uri
 
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connectFailedCalled 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 server
- ioe- The I/O exception thrown when the connect failed.
- Throws:
- IllegalArgumentException- if either argument is null
 
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ofReturns a ProxySelector which uses the given proxy address for all HTTP and HTTPS requests. If proxy isnullthen proxying is disabled.- Parameters:
- proxyAddress- The address of the proxy
- Returns:
- a ProxySelector
- Since:
- 9
 
 
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