IT. Expert System.

Android Reference

Socket

java.net

Class Socket

java.lang.Object
- java.net.Socket

Direct Known Subclasses:

LinkSocket, SSLSocket
```
public class Socket
extends Object
```
Provides a client-side TCP socket.

Constructor Summary

Constructors
Modifier	Constructor and Description
	`Socket()` Creates a new unconnected socket.
	`Socket(InetAddress dstAddress, int dstPort)` Creates a new streaming socket connected to the target host specified by the parameters `dstAddress` and `dstPort`.
	`Socket(InetAddress addr, int port, boolean streaming)` Deprecated. Use `Socket(InetAddress, int)` instead of this for streaming sockets or an appropriate constructor of `DatagramSocket` for UDP transport.
	`Socket(InetAddress dstAddress, int dstPort, InetAddress localAddress, int localPort)` Creates a new streaming socket connected to the target host specified by the parameters `dstAddress` and `dstPort`.
	`Socket(Proxy proxy)` Creates a new unconnected socket using the given proxy type.
`protected`	`Socket(SocketImpl impl)` Creates an unconnected socket with the given socket implementation.
	`Socket(String dstName, int dstPort)` Creates a new streaming socket connected to the target host specified by the parameters `dstName` and `dstPort`.
	`Socket(String hostName, int port, boolean streaming)` Deprecated. Use `Socket(String, int)` instead of this for streaming sockets or an appropriate constructor of `DatagramSocket` for UDP transport.
	`Socket(String dstName, int dstPort, InetAddress localAddress, int localPort)` Creates a new streaming socket connected to the target host specified by the parameters `dstName` and `dstPort`.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`bind(SocketAddress localAddr)` Binds this socket to the given local host address and port specified by the SocketAddress `localAddr`.
`void`	`close()` Closes the socket.
`void`	`connect(SocketAddress remoteAddr)` Connects this socket to the given remote host address and port specified by the SocketAddress `remoteAddr`.
`void`	`connect(SocketAddress remoteAddr, int timeout)` Connects this socket to the given remote host address and port specified by the SocketAddress `remoteAddr` with the specified timeout.
`SocketChannel`	`getChannel()` Returns this socket's `SocketChannel`, if one exists.
`FileDescriptor`	`getFileDescriptor$()`
`InetAddress`	`getInetAddress()` Returns the IP address of the target host this socket is connected to, or null if this socket is not yet connected.
`InputStream`	`getInputStream()` Returns an input stream to read data from this socket.
`boolean`	`getKeepAlive()` Returns this socket's `SocketOptions.SO_KEEPALIVE` setting.
`InetAddress`	`getLocalAddress()` Returns the local IP address this socket is bound to, or `InetAddress.ANY` if the socket is unbound.
`int`	`getLocalPort()` Returns the local port this socket is bound to, or -1 if the socket is unbound.
`SocketAddress`	`getLocalSocketAddress()` Returns the local address and port of this socket as a SocketAddress or null if the socket is unbound.
`boolean`	`getOOBInline()` Returns this socket's `SocketOptions.SO_OOBINLINE` setting.
`OutputStream`	`getOutputStream()` Returns an output stream to write data into this socket.
`int`	`getPort()` Returns the port number of the target host this socket is connected to, or 0 if this socket is not yet connected.
`int`	`getReceiveBufferSize()` Returns this socket's `receive buffer size`.
`SocketAddress`	`getRemoteSocketAddress()` Returns the remote address and port of this socket as a `SocketAddress` or null if the socket is not connected.
`boolean`	`getReuseAddress()` Returns this socket's `SocketOptions.SO_REUSEADDR` setting.
`int`	`getSendBufferSize()` Returns this socket's `send buffer size`.
`int`	`getSoLinger()` Returns this socket's `linger` timeout in seconds, or -1 for no linger (i.e.
`int`	`getSoTimeout()` Returns this socket's `receive timeout`.
`boolean`	`getTcpNoDelay()` Returns this socket's `SocketOptions#TCP_NODELAY` setting.
`int`	`getTrafficClass()` Returns this socket's `SocketOptions.IP_TOS` setting.
`boolean`	`isBound()` Returns whether this socket is bound to a local address and port.
`boolean`	`isClosed()` Returns whether this socket is closed.
`boolean`	`isConnected()` Returns whether this socket is connected to a remote host.
`boolean`	`isInputShutdown()` Returns whether the incoming channel of the socket has already been closed.
`boolean`	`isOutputShutdown()` Returns whether the outgoing channel of the socket has already been closed.
`void`	`sendUrgentData(int value)` Sends the given single byte data which is represented by the lowest octet of `value` as "TCP urgent data".
`void`	`setKeepAlive(boolean keepAlive)` Sets this socket's `SocketOptions.SO_KEEPALIVE` option.
`void`	`setOOBInline(boolean oobinline)` Sets this socket's `SocketOptions.SO_OOBINLINE` option.
`void`	`setPerformancePreferences(int connectionTime, int latency, int bandwidth)` Sets performance preferences for connectionTime, latency and bandwidth.
`void`	`setReceiveBufferSize(int size)` Sets this socket's `receive buffer size`.
`void`	`setReuseAddress(boolean reuse)` Sets this socket's `SocketOptions.SO_REUSEADDR` option.
`void`	`setSendBufferSize(int size)` Sets this socket's `send buffer size`.
`static void`	`setSocketImplFactory(SocketImplFactory fac)` Sets the internal factory for creating socket implementations.
`void`	`setSoLinger(boolean on, int timeout)` Sets this socket's `linger` timeout in seconds.
`void`	`setSoTimeout(int timeout)` Sets this socket's `read timeout` in milliseconds.
`void`	`setTcpNoDelay(boolean on)` Sets this socket's `SocketOptions.TCP_NODELAY` option.
`void`	`setTrafficClass(int value)` Sets this socket's `SocketOptions.IP_TOS` value for every packet sent by this socket.
`void`	`shutdownInput()` Closes the input stream of this socket.
`void`	`shutdownOutput()` Closes the output stream of this socket.
`String`	`toString()` Returns a `String` containing a concise, human-readable description of the socket.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Socket
```
public Socket()
```
    Creates a new unconnected socket. When a SocketImplFactory is defined it creates the internal socket implementation, otherwise the default socket implementation will be used for this socket.
    
    See Also:
    SocketImplFactory, SocketImpl
  - Socket
```
public Socket(Proxy proxy)
```
    Creates a new unconnected socket using the given proxy type. When a SocketImplFactory is defined it creates the internal socket implementation, otherwise the default socket implementation will be used for this socket.
    Example that will create a socket connection through a SOCKS proxy server:
    Socket sock = new Socket(new Proxy(Proxy.Type.SOCKS, new InetSocketAddress("test.domain.org", 2130)));
    
    Parameters:
    proxy - the specified proxy for this socket.
    
    Throws:
    
    IllegalArgumentException - if the argument proxy is null or of an invalid type.
    See Also:
    SocketImplFactory, SocketImpl
  - Socket
```
public Socket(String dstName,
      int dstPort)
       throws UnknownHostException,
              IOException
```
    Creates a new streaming socket connected to the target host specified by the parameters dstName and dstPort. The socket is bound to any available port on the local host.
    This implementation tries each IP address for the given hostname (in RFC 3484 order) until it either connects successfully or it exhausts the set.
    
    Parameters:
    dstName - the target host name or IP address to connect to.
    dstPort - the port on the target host to connect to.
    
    Throws:
    
    UnknownHostException - if the host name could not be resolved into an IP address.
    
    IOException - if an error occurs while creating the socket.
  - Socket
```
public Socket(String dstName,
      int dstPort,
      InetAddress localAddress,
      int localPort)
       throws IOException
```
    Creates a new streaming socket connected to the target host specified by the parameters dstName and dstPort. On the local endpoint the socket is bound to the given address localAddress on port localPort. If host is null a loopback address is used to connect to.
    This implementation tries each IP address for the given hostname (in RFC 3484 order) until it either connects successfully or it exhausts the set.
    
    Parameters:
    dstName - the target host name or IP address to connect to.
    dstPort - the port on the target host to connect to.
    localAddress - the address on the local host to bind to.
    localPort - the port on the local host to bind to.
    
    Throws:
    
    UnknownHostException - if the host name could not be resolved into an IP address.
    
    IOException - if an error occurs while creating the socket.
  - Socket
```
@Deprecated
public Socket(String hostName,
                 int port,
                 boolean streaming)
       throws IOException
```
    Deprecated. Use Socket(String, int) instead of this for streaming sockets or an appropriate constructor of DatagramSocket for UDP transport.
    
    Creates a new streaming or datagram socket connected to the target host specified by the parameters hostName and port. The socket is bound to any available port on the local host.
    This implementation tries each IP address for the given hostname (in RFC 3484 order) until it either connects successfully or it exhausts the set.
    
    Parameters:
    hostName - the target host name or IP address to connect to.
    port - the port on the target host to connect to.
    streaming - if true a streaming socket is returned, a datagram socket otherwise.
    
    Throws:
    
    UnknownHostException - if the host name could not be resolved into an IP address.
    
    IOException - if an error occurs while creating the socket.
  - Socket
```
public Socket(InetAddress dstAddress,
      int dstPort)
       throws IOException
```
    Creates a new streaming socket connected to the target host specified by the parameters dstAddress and dstPort. The socket is bound to any available port on the local host.
    
    Parameters:
    dstAddress - the target host address to connect to.
    dstPort - the port on the target host to connect to.
    
    Throws:
    
    IOException - if an error occurs while creating the socket.
  - Socket
```
public Socket(InetAddress dstAddress,
      int dstPort,
      InetAddress localAddress,
      int localPort)
       throws IOException
```
    Creates a new streaming socket connected to the target host specified by the parameters dstAddress and dstPort. On the local endpoint the socket is bound to the given address localAddress on port localPort.
    
    Parameters:
    dstAddress - the target host address to connect to.
    dstPort - the port on the target host to connect to.
    localAddress - the address on the local host to bind to.
    localPort - the port on the local host to bind to.
    
    Throws:
    
    IOException - if an error occurs while creating the socket.
  - Socket
```
@Deprecated
public Socket(InetAddress addr,
                 int port,
                 boolean streaming)
       throws IOException
```
    Deprecated. Use Socket(InetAddress, int) instead of this for streaming sockets or an appropriate constructor of DatagramSocket for UDP transport.
    
    Creates a new streaming or datagram socket connected to the target host specified by the parameters addr and port. The socket is bound to any available port on the local host.
    
    Parameters:
    addr - the Internet address to connect to.
    port - the port on the target host to connect to.
    streaming - if true a streaming socket is returned, a datagram socket otherwise.
    
    Throws:
    
    IOException - if an error occurs while creating the socket.
  - Socket
```
protected Socket(SocketImpl impl)
          throws SocketException
```
    Creates an unconnected socket with the given socket implementation.
    
    Parameters:
    impl - the socket implementation to be used.
    
    Throws:
    
    SocketException - if an error occurs while creating the socket.
- Method Detail
  - close
```
public void close()
           throws IOException
```
    Closes the socket. It is not possible to reconnect or rebind to this socket thereafter which means a new socket instance has to be created.
    
    Throws:
    
    IOException - if an error occurs while closing the socket.
  - getInetAddress
```
public InetAddress getInetAddress()
```
    Returns the IP address of the target host this socket is connected to, or null if this socket is not yet connected.
  - getInputStream
```
public InputStream getInputStream()
                           throws IOException
```
    Returns an input stream to read data from this socket.
    
    Returns:
    the byte-oriented input stream.
    
    Throws:
    
    IOException - if an error occurs while creating the input stream or the socket is in an invalid state.
  - getKeepAlive
```
public boolean getKeepAlive()
                     throws SocketException
```
    Returns this socket's SocketOptions.SO_KEEPALIVE setting.
    
    Throws:
    
    SocketException
  - getLocalAddress
```
public InetAddress getLocalAddress()
```
    Returns the local IP address this socket is bound to, or InetAddress.ANY if the socket is unbound.
  - getLocalPort
```
public int getLocalPort()
```
    Returns the local port this socket is bound to, or -1 if the socket is unbound.
  - getOutputStream
```
public OutputStream getOutputStream()
                             throws IOException
```
    Returns an output stream to write data into this socket.
    
    Returns:
    the byte-oriented output stream.
    
    Throws:
    
    IOException - if an error occurs while creating the output stream or the socket is in an invalid state.
  - getPort
```
public int getPort()
```
    Returns the port number of the target host this socket is connected to, or 0 if this socket is not yet connected.
  - getSoLinger
```
public int getSoLinger()
                throws SocketException
```
    Returns this socket's linger timeout in seconds, or -1 for no linger (i.e. close will return immediately).
    
    Throws:
    
    SocketException
  - getReceiveBufferSize
```
public int getReceiveBufferSize()
                         throws SocketException
```
    Returns this socket's receive buffer size.
    
    Throws:
    
    SocketException
  - getSendBufferSize
```
public int getSendBufferSize()
                      throws SocketException
```
    Returns this socket's send buffer size.
    
    Throws:
    
    SocketException
  - getSoTimeout
```
public int getSoTimeout()
                 throws SocketException
```
    Returns this socket's receive timeout.
    
    Throws:
    
    SocketException
  - getTcpNoDelay
```
public boolean getTcpNoDelay()
                      throws SocketException
```
    Returns this socket's SocketOptions#TCP_NODELAY setting.
    
    Throws:
    
    SocketException
  - setKeepAlive
```
public void setKeepAlive(boolean keepAlive)
                  throws SocketException
```
    Sets this socket's SocketOptions.SO_KEEPALIVE option.
    
    Throws:
    
    SocketException
  - setSocketImplFactory
```
public static void setSocketImplFactory(SocketImplFactory fac)
                                 throws IOException
```
    Sets the internal factory for creating socket implementations. This may only be executed once during the lifetime of the application.
    
    Parameters:
    fac - the socket implementation factory to be set.
    
    Throws:
    
    IOException - if the factory has been already set.
  - setSendBufferSize
```
public void setSendBufferSize(int size)
                       throws SocketException
```
    Sets this socket's send buffer size.
    
    Throws:
    
    SocketException
  - setReceiveBufferSize
```
public void setReceiveBufferSize(int size)
                          throws SocketException
```
    Sets this socket's receive buffer size.
    
    Throws:
    
    SocketException
  - setSoLinger
```
public void setSoLinger(boolean on,
               int timeout)
                 throws SocketException
```
    Sets this socket's linger timeout in seconds. If on is false, timeout is irrelevant.
    
    Throws:
    
    SocketException
  - setSoTimeout
```
public void setSoTimeout(int timeout)
                  throws SocketException
```
    Sets this socket's read timeout in milliseconds. Use 0 for no timeout. To take effect, this option must be set before the blocking method was called.
    
    Throws:
    
    SocketException
  - setTcpNoDelay
```
public void setTcpNoDelay(boolean on)
                   throws SocketException
```
    Sets this socket's SocketOptions.TCP_NODELAY option.
    
    Throws:
    
    SocketException
  - toString
```
public String toString()
```
    Returns a String containing a concise, human-readable description of the socket.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    the textual representation of this socket.
  - shutdownInput
```
public void shutdownInput()
                   throws IOException
```
    Closes the input stream of this socket. Any further data sent to this socket will be discarded. Reading from this socket after this method has been called will return the value EOF.
    
    Throws:
    
    IOException - if an error occurs while closing the socket input stream.
    
    SocketException - if the input stream is already closed.
  - shutdownOutput
```
public void shutdownOutput()
                    throws IOException
```
    Closes the output stream of this socket. All buffered data will be sent followed by the termination sequence. Writing to the closed output stream will cause an IOException.
    
    Throws:
    
    IOException - if an error occurs while closing the socket output stream.
    
    SocketException - if the output stream is already closed.
  - getLocalSocketAddress
```
public SocketAddress getLocalSocketAddress()
```
    Returns the local address and port of this socket as a SocketAddress or null if the socket is unbound. This is useful on multihomed hosts.
  - getRemoteSocketAddress
```
public SocketAddress getRemoteSocketAddress()
```
    Returns the remote address and port of this socket as a SocketAddress or null if the socket is not connected.
    
    Returns:
    the remote socket address and port.
  - isBound
```
public boolean isBound()
```
    Returns whether this socket is bound to a local address and port.
    
    Returns:
    true if the socket is bound to a local address, false otherwise.
  - isConnected
```
public boolean isConnected()
```
    Returns whether this socket is connected to a remote host.
    
    Returns:
    true if the socket is connected, false otherwise.
  - isClosed
```
public boolean isClosed()
```
    Returns whether this socket is closed.
    
    Returns:
    true if the socket is closed, false otherwise.
  - bind
```
public void bind(SocketAddress localAddr)
          throws IOException
```
    Binds this socket to the given local host address and port specified by the SocketAddress localAddr. If localAddr is set to null, this socket will be bound to an available local address on any free port.
    
    Parameters:
    localAddr - the specific address and port on the local machine to bind to.
    
    Throws:
    
    IllegalArgumentException - if the given SocketAddress is invalid or not supported.
    
    IOException - if the socket is already bound or an error occurs while binding.
  - connect
```
public void connect(SocketAddress remoteAddr)
             throws IOException
```
    Connects this socket to the given remote host address and port specified by the SocketAddress remoteAddr.
    
    Parameters:
    remoteAddr - the address and port of the remote host to connect to.
    
    Throws:
    
    IllegalArgumentException - if the given SocketAddress is invalid or not supported.
    
    IOException - if the socket is already connected or an error occurs while connecting.
  - connect
```
public void connect(SocketAddress remoteAddr,
           int timeout)
             throws IOException
```
    Connects this socket to the given remote host address and port specified by the SocketAddress remoteAddr with the specified timeout. The connecting method will block until the connection is established or an error occurred.
    
    Parameters:
    remoteAddr - the address and port of the remote host to connect to.
    timeout - the timeout value in milliseconds or 0 for an infinite timeout.
    
    Throws:
    
    IllegalArgumentException - if the given SocketAddress is invalid or not supported or the timeout value is negative.
    
    IOException - if the socket is already connected or an error occurs while connecting.
  - isInputShutdown
```
public boolean isInputShutdown()
```
    Returns whether the incoming channel of the socket has already been closed.
    
    Returns:
    true if reading from this socket is not possible anymore, false otherwise.
  - isOutputShutdown
```
public boolean isOutputShutdown()
```
    Returns whether the outgoing channel of the socket has already been closed.
    
    Returns:
    true if writing to this socket is not possible anymore, false otherwise.
  - setReuseAddress
```
public void setReuseAddress(boolean reuse)
                     throws SocketException
```
    Sets this socket's SocketOptions.SO_REUSEADDR option.
    
    Throws:
    
    SocketException
  - getReuseAddress
```
public boolean getReuseAddress()
                        throws SocketException
```
    Returns this socket's SocketOptions.SO_REUSEADDR setting.
    
    Throws:
    
    SocketException
  - setOOBInline
```
public void setOOBInline(boolean oobinline)
                  throws SocketException
```
    Sets this socket's SocketOptions.SO_OOBINLINE option.
    
    Throws:
    
    SocketException
  - getOOBInline
```
public boolean getOOBInline()
                     throws SocketException
```
    Returns this socket's SocketOptions.SO_OOBINLINE setting.
    
    Throws:
    
    SocketException
  - setTrafficClass
```
public void setTrafficClass(int value)
                     throws SocketException
```
    Sets this socket's SocketOptions.IP_TOS value for every packet sent by this socket.
    
    Throws:
    
    SocketException
  - getTrafficClass
```
public int getTrafficClass()
                    throws SocketException
```
    Returns this socket's SocketOptions.IP_TOS setting.
    
    Throws:
    
    SocketException
  - sendUrgentData
```
public void sendUrgentData(int value)
                    throws IOException
```
    Sends the given single byte data which is represented by the lowest octet of value as "TCP urgent data".
    
    Parameters:
    value - the byte of urgent data to be sent.
    
    Throws:
    
    IOException - if an error occurs while sending urgent data.
  - getChannel
```
public SocketChannel getChannel()
```
    Returns this socket's SocketChannel, if one exists. A channel is available only if this socket wraps a channel. (That is, you can go from a channel to a socket and back again, but you can't go from an arbitrary socket to a channel.) In practice, this means that the socket must have been created by ServerSocketChannel.accept() or SocketChannel.open().
  - getFileDescriptor$
```
public FileDescriptor getFileDescriptor$()
```
  - setPerformancePreferences
```
public void setPerformancePreferences(int connectionTime,
                             int latency,
                             int bandwidth)
```
    Sets performance preferences for connectionTime, latency and bandwidth.
    This method does currently nothing.
    
    Parameters:
    connectionTime - the value representing the importance of a short connecting time.
    latency - the value representing the importance of low latency.
    bandwidth - the value representing the importance of high bandwidth.

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IT. Expert System.

Android Reference

Socket

Class Socket

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Socket

Socket

Socket

Socket

Socket

Socket

Socket

Socket

Socket

Method Detail

close

getInetAddress

getInputStream

getKeepAlive

getLocalAddress

getLocalPort

getOutputStream

getPort

getSoLinger

getReceiveBufferSize

getSendBufferSize

getSoTimeout

getTcpNoDelay

setKeepAlive

setSocketImplFactory

setSendBufferSize

setReceiveBufferSize

setSoLinger

setSoTimeout

setTcpNoDelay

toString

shutdownInput

shutdownOutput

getLocalSocketAddress

getRemoteSocketAddress

isBound

isConnected

isClosed

bind

connect

connect

isInputShutdown

isOutputShutdown

setReuseAddress

getReuseAddress

setOOBInline

getOOBInline

setTrafficClass

getTrafficClass

sendUrgentData

getChannel

getFileDescriptor$

setPerformancePreferences

Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)

SQL

HTML

PHP

CSS

Java Script

MYSQL

JQUERY

VBS

REGEX

C

C++

C#

Design patterns

RFC (standard status)

RFC (proposed standard status)