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appendix K
java.net
Package Reference
CONTENTS
The java.net package contains
classes and interfaces used for networking. This includes classes
to create and manipulate sockets, data packets, and URLs.
This interface signals when an unknown service exception has occurred.
createContentHandler
public abstract ContentHandler createContentHandler(String
mimetype)
The createContentHandler
method creates a new content handler to read the content from
a URLStreamHandler using
the specified MIME type.
Parameters: mimetype-a
String object containing
the MIME type of the content.
Returns: A ContentHandler
object that will read data from a URL connection and construct
an object.
This interface is used by the socket class to specify socket implementations.
createSocketImpl
SocketImpl createSocketImpl()
The createSocketImple
method creates a SocketImpl
instance that is an implementation of a socket.
Returns: A SocketImpl
object that provides a socket implementation.
This interface is used by the URL
class to create stream handlers for various stream types.
createURLStreamHandler
URLStreamHandler createURLStreamHandler(String
protocol)
The createURLStreamHandler
method creates a URLStreamHandler
instance for use by the URL
class based on the specified protocol.
Parameters: protocol-a
String object that specifies
the protocol to be used by the URLStreamHandler
class.
Returns: A URLStreamHandler
object that is created with the protocol specified in the input
parameter.
Extends: Object
The ContentHandler
class is used as a base class for classes that will handle specific
MIME content types.
getContent
abstract public Object getContent(URLConnection
urlc)
The getContent
method accepts a URLConnection
argument positioned at the beginning of an input stream and constructs
an object from the input stream.
Parameters: urlc-a
URLConnection object representing
the input stream to be read in by the content handler.
Returns: An object that was constructed from the
specified URL connection.
Throws: IOException
if the input stream could not be read.
Extends: Object
The DatagramPacket
class is used to store packet data such as data, length, Internet
address, and port.
DatagramPacket Constructor
public DatagramPacket(byte ibuf[], int ilength)
This DatagramPacket constructor constructs a DatagramPacket object
to be used for receiving datagrams.
Parameters:
ibuf-an array of
bytes that will be used to store the datagram packet.
ilength-an integer value
specifying the size of the datagram packet.
DatagramPacket Constructor
public DatagramPacket(byte ibuf[], int
ilength, InetAddress iaddr, int iport)
This DatagramPacket
constructor constructs a DatagramPacket
object to be sent.
Parameters:
ibuf-an array of
bytes that will be used to store the datagram packet.
ilength-an integer value
specifying the size of the datagram packet.
iaddr-the destination IP
address.
iport-the destination port.
getAddress
public InetAddress getAddress()
The getAddress
method returns the IP address value of the DatagramPacket.
Returns: An InetAddress
object containing the IP address of the datagram packet.
getPort
public int getPort()
The getPort method
returns the port value of the DatagramPacket.
Returns: An integer value containing the port address
of the datagram packet.
getData
public byte[] getData()
The getData method
returns the array of datagram packet values.
Returns: An array of bytes containing the contents
of the datagram packet.
getLength
public int getLength()
The getLength
method returns the length of the datagram packet.
Returns: An integer value containing the length
of the datagram packet.
Extends: Object
The DatagramSocket
class is used to designate a dedicated socket for implementing
unreliable datagrams.
DatagramSocket Constructor
public DatagramSocket() throws SocketException
The DatagramSocket
constructor is used to implement an unreliable Datagram
connection.
Throws: SocketException
if the socket could not be created.
DatagramSocket Constructor
public DatagramSocket(int port) throws
SocketException
This DatagramSocket
constructor implements an unreliable datagram connection using
the specified port value.
Parameters: port-an
integer value specifying the port to be used for the socket.
Throws: SocketException
if the socket could not be created.
send
public void send(DatagramPacket p) throws
IOException
The send method
sends a datagram packet to the destination address specified in
the datagram packet's address value.
Parameters: p-a
DatagramPacket object containing
data to be sent through the socket.
Throws: IOException
if an I/O exception has occurred.
receive
public synchronized void receive(DatagramPacket
p) throws IOException
The receive method
receives a datagram packet. This method will block until the datagram
packet has been received.
Parameters: p-the
datagram packet to be received.
Throws: IOException
if an I/O exception has occurred.
getLocalPort
public int getLocalPort()
The getLocalPort
method returns the port on the local machine that this socket
is bound to.
Returns: An integer value containing the port value
that this socket is bound to.
close
public synchronized void close()
The close method
closes the datagram socket.
Extends: Object
The InetAddress
class is used to represent Internet addresses.
getHostName
public String getHostName()
The getHostName
method returns the name of the host for this InetAddress.
If the host is null, the returned string will contain any of the
local machine's available network addresses.
Returns: A String
object containing the name of the host for this InetAddress.
getAddress
public byte[] getAddress()
The getAddress
method returns an array of bytes containing the raw IP address
in network byte order.
Returns: A byte array containing the raw IP address
of this InetAddress in network
byte order.
getHostAddress
public String getHostAddress()
The getHostAddress
method returns the IP address string %d.%d.%d.%d.
Returns: A String
value containing the raw IP address using the standard IP address
format.
hashCode
public int hashCode()
The hashCode
method returns a hash code for this InetAddress.
Returns: An integer value representing this InetAddress's
hash code.
equals
public boolean equals(Object obj)
The equals method
is used to compare this InetAddress
object to the specified object.
Parameters: obj-the
object to be compared with the address.
Returns: A boolean value that will be true
if the objects are equal; false
if not.
toString
public String toString()
The toString
method is used to return a string representation of the InetAddress.
Returns: A String
value containing information about the InetAddress.
getByName
public static synchronized InetAddress
getByName(String host)
throws UnknownHostException
The getByName
method returns an InetAddress
object based on the specified hostname.
Parameters: host-a
string object specifying the name of the host.
Returns: An InetAddress
object containing the Internet address information for the specified
host.
Throws: UnknownHostException
if the specified host is invalid or unknown.
getAllByName
public static synchronized InetAddress
getAllByName(String host)[]
throws UnknownHostException
The getAllByName
method returns an array of InetAddress
objects representing all of the addresses for the specified host.
Parameters: host-a
String object specifying
the name of the host.
Returns: An array of all corresponding InetAddresses
for the specified host.
Throws: UnknownHostException
if the specified host is invalid or unknown.
getLocalHost
public static InetAddress getLocalHost()
throws UnknownHostException
The getLocalHost()
returns an InetAddress object
representing the address of the local host.
Returns: An InetAddress
object containing the Internet address information for the local
host.
Extends: Object
The ServerSocket
class is used to encapsulate a server socket.
ServerSocket Constructor
public ServerSocket(int port) throws
IOException
The ServerSocket
constructor creates a server socket on the specified port.
Parameters: port-an
integer value specifying the port to create the socket on.
Throws: IOException
if an I/O exception has occurred.
ServerSocket Constructor
public ServerSocket(int port, int backlog)
throws IOException
This ServerSocket
constructor creates a server socket on the specified port and
listens to it for a specified time.
Parameters: port-an
integer value specifying the port to create the socket on.
Throws: IOException
if an I/O exception has occurred.
getInetAddress
public InetAddress getInetAddress()
The getInetAddress
method returns an InetAddress
object specifying the address to which this socket is connected.
Returns: An InetAddress
object containing the address information to which the socket
is connected.
getLocalPort
public int getLocalPort()
The getLocalPort
method returns the local port on which the socket is currently
listening.
Returns: An integer value representing the port
on the local machine which the server socket is listening to.
accept
public Socket accept() throws IOException
The accept method
is used to accept a connection. This method will block all others
until a connection is made.
Returns: A Socket
object after the connection has been accepted.
Throws: IOException
if an I/O error occurred when waiting for the connection.
close
public void close() throws IOException
The close method
closes the socket's connection.
Throws: IOException
if an I/O error occurred while closing the server socket.
toString
public String toString()
The toString
method returns a string representation of the ServerSocket.
Returns: A String
object containing the implementation address and implementation
port of the server socket.
setSocketFactory
public static synchronized void setSocketFactory(SocketImplFactory
fac)
throws IOException, SocketException
The setSocketFactory
method sets the server SocketImplFactory
for use by this ServerSocket.
This factory can only be set once.
Parameters: fac-a
SocketImplFactory derived
object to be used by this server socket.
Throws: IOException
if there was an I/O error when setting the SocketImplFactory.
A SocketException if the
SocketImplFactory has already
been set.
Extends: Object
The Socket class
is used to implement socket functionality. The setSocketImplFactory
method is used to change the socket's implementation based on
specific firewalls.
Socket Constructor
public Socket(String host, int port)
throws UnknownHostException,
IOException
This Socket constructor
creates a stream socket to the specified port on the specified
host.
Parameters:
host-a String
object containing the hostname to create the socket on.
port-an integer value representing
the port to create the socket on.
Throws: UnknownHostException
if the hostname is unrecognized or invalid.
An IOException if an I/O
error occurred while creating the socket.
Socket Constructor
public Socket(String host, int port,
boolean stream) throws
IOException
This Socket constructor
creates a stream socket to the specified port on the specified
host.
The boolean stream value can be used to specify a stream socket
or a datagram socket.
Parameters:
host-a String
object containing the hostname to create the socket on.
port-an integer value representing
the port to create the socket on.
stream-a boolean value that
is true if a stream socket
is to be created; false if
a datagram socket is to be created.
Throws: IOException
if an I/O error occurred while creating the socket.
Socket Constructor
public Socket(InetAddress address, int
port) throws IOException
This Socket constructor
creates a stream socket to the specified port at the specified
InetAddress.
Parameters:
address-an InetAddress
object specifying the address to create the socket at.
port-an integer value representing
the port to create the socket on.
Throws: IOException
if an I/O error occurred while creating the socket.
Socket Constructor
public Socket(InetAddress address, int
port, boolean stream)
throws IOException
This Socket constructor
creates a stream socket to the specified port at the specified
address. The boolean stream value can be used to specify a stream
socket or a datagram socket.
Parameters:
address-an InetAddress
object specifying the address to create the socket at.
port-an integer value representing
the port to create the socket on.
stream-a boolean value that
is true if a stream socket
is to be created; false if
a datagram socket is to be created.
Throws: IOException
if an I/O error occurred while creating the socket.
getInetAddress
public InetAddress getInetAddress()
The getInetAddress
method is used to return the address to which the socket is connected.
Returns: An InetAddress
object containing information about the address to which the socket
is connected.
getPort
public int getPort()
The getPort method
returns the remote port to which the socket is connected.
Returns: An integer value representing the remote
port number that the socket is con-
nected to.
getLocalPort
public int getLocalPort()
The getLocalPort
method returns the local port to which the socket is connected.
Returns: An integer value representing the local
port number that the socket is connected to.
getInputStream
public InputStream getInputStream() throws
IOException
The getInputStream
method returns an input stream for this socket.
Returns: An InputStream
object to be used as the socket's input stream.
Throws: IOException
if an I/O error occurred while retrieving the input stream.
getOutputStream
public OutputStream getOutputStream()
throws IOException
The getOutputStream
method returns an output stream for this socket.
Returns: An OutputStream
object to be used as the socket's output stream.
Throws: IOException
if an I/O error occurred while retrieving the output stream.
close
public synchronized void close() throws
IOException
The close method
closes the socket's connection.
Throws: IOException
if an I/O error occurred while closing the socket.
toString
public String toString()
The toString
method returns a string representation of the socket.
Returns: A String
object containing the socket information.
setSocketImplFactory
public static synchronized void setSocketImplFactory(SocketImplFactory
fac)
throws IOException
The setSocketImplFactory
method sets the SocketImplFactory
interface for this socket. The factory can only be specified once.
Parameters: fac-a
SocketImplFactory derived
object to be used by this socket.
Throws: IOException
if an I/O error occurred while setting the SocketImplFactory.
Extends: Object
The SocketImpl
class is an abstract base class provided as a template for socket
implementations.
toString
public String toString()
The toString
method returns a string representation of the SocketImpl
class.
Returns: A String
object containing the port and address of this socket.
Extends: Object
The URL class
is used to represent a uniform resource locator. URL
is a reference to an object on the Web such as an FTP site, an
e-mail address, or an HTML page on a Web server.
URL Constructor
public URL(String protocol, String host,
int port, String file) throws
MalformedURLException
This URL constructor
creates a URL using the specified protocol, host, port, and host
filename.
Parameters:
protocol-a String
object specifying the protocol to be used.
host-a String
object specifying the hostname.
port-an integer value specifying
the port.
file-a String
object specifying the file name on the host.
Throws: MalformedURLException
if the protocol was unknown or invalid.
URL Constructor
public URL(String protocol, String host,
String file) throws
MalformedURLException
This URL constructor
creates a URL using the specified protocol, host, and host file
name. The port number will be the default port used for the specified
protocol.
Parameters:
protocol-a String
object specifying the protocol to be used.
host-a String
object specifying the hostname.
file-a String
object specifying the file name on the host.
Throws: MalformedURLException
if the protocol was unknown or invalid.
URL Constructor
public URL(String spec) throws MalformedURLException
This URL constructor
creates a URL using the specified unparsed URL.
Parameters: spec-a
String object containing
an unparsed URL string.
Throws: MalformedURLException
if the specified unparsed URL was invalid.
URL Constructor
public URL(URL context, String spec)
throws MalformedURLException
This URL constructor
creates a URL using the specified context and unparsed URL. If
the unparsed URL is an absolute URL it is used as is, otherwise
it is used in combination with the specified context.
Parameters:
context-a URL
object specifying the context to be used in combination with the
unparsed URL string.
spec-a String
object containing an unparsed URL string.
Throws: MalformedURLException
if the specified unparsed URL was invalid.
getPort
public int getPort()
The getPort method
returns the port number for this URL.
Returns: An integer value representing the port
number for this URL, which is -1
if the port has not been set.
getProtocol
public String getProtocol()
The getProtocol
method returns a string representing the protocol used by this
URL.
Returns: A String
object containing the protocol name.
getHost
public String getHost()
The getHost method
returns a string containing the hostname.
Returns: A String
object containing the hostname.
getFile
public String getFile()
The getFile method
returns a string containing the host filename.
Returns: A String
object containing the name of the file on the host.
getRef
public String getRef()
The getRef method
returns the ref (if any) that was specified in the unparsed string
used to create this URL.
Returns: A String
object containing the URL's ref.
equals
public boolean equals(Object obj)
The equals method
can be used to compare this URL to another object.
Parameters: obj-an
object that will be compared with this URL.
Returns: A boolean value that will be true
if the objects are equal, false
if not.
hashCode
public int hashCode()
The hashCode
method will return a hash code value for the URL.
Returns: An integer value representing the hash
code value of this URL.
sameFile
public boolean sameFile(URL other)
The sameFile
method can be used to determine if the specified file is the same
file used to create this URL.
Parameters: other-a
URL object specifying the
location of another file.
Returns: A boolean value that will be true
if the files are equal; false
if not.
toString
public String toString()
The toString
method returns a string representation of the URL.
Returns: A String
object containing a textual representation of the URL including
the protocol, host, port, and filename.
toExternalForm
public String toExternalForm()
The toExternalForm
method is used to reverse the parsing of the URL.
Returns: A String
object containing the textual representation of the fully qualified
URL.
openConnection
public URLConnection openConnection()
throws java.io.IOException
The openConnection
method will open a URLConnection
to the object specified by the URL.
Returns: A URLConnection
object that represents a connection to the URL.
Throws: IOException
if an I/O error occurred while creating the URL connection.
openStream
public final InputStream openStream()
throws java.io.IOException
The openStream
method opens an InputStream.
Returns: An InputStream
representing an input stream for the URL.
Throws: IOException
if an I/O error occurred while creating the input stream.
getContent
public final Object getContent() throws
java.io.IOException
The getContent
method retrieves the contents from the opened connection.
Returns: An object representing the contents that
are retrieved from the connection.
Throws: IOException
if an I/O error occurred while retrieving the content.
setURLStreamHandlerFactory
public static synchronized void setURLStreamHandlerFactory(
URLStreamHandlerFactory fac)
The setURLStreamHandlerFactory
method sets the URLStreamHandlerFactory
interface for this URL. The factory can only be specified once.
Parameters: fac-a
URLStreamHandlerFactory interface
to be used by this URL.
Throws: Error
if this factory has already been specified.
Extends: Object
The URLConnection
class is an abstract base class used to represent a URL connection.
It must be subclassed in order to provide true functionality.
connect
abstract public void connect() throws
IOException
The connect method
is used to connect the URLConnection
after it has been created. Operations that depend on being connected
will call this method to automatically connect.
Throws: IOException
if an I/O error occurred while the connection was attempted.
getURL
public URL getURL()
The getURL method
returns the URL for this URL connection.
Returns: A URL
object.
getContentLength
public int getContentLength()
The getContentLength
method returns the length of the content.
Returns: An integer value containing the length
of the content, which is -1
if the length is not known.
getContentType
public String getContentType()
The getContentType
method returns the type of the content.
Returns: A String
object containing the type of the content, which is null
if the type is not known.
getContentEncoding
public String getContentEncoding()
The getContentEncoding
method returns the encoding of the content.
Returns: A String
object containing the encoding of the content, which is null
if the encoding is not known.
getExpiration
public long getExpiration()
The getExpiration
method will return the expiration of the object.
Returns: A long value containing the expiration
of the object. This value will be 0
if the expiration is not known.
getDate
public long getDate()
The getDate method
will return the date of the object.
Returns: A long value containing the date of the
object. This value will be 0
if the date is not known.
getLastModified
public long getLastModified()
The getLastModified()
will return the last modified date of the object.
Returns: A long value containing the last modified
date of the object. This value will be 0
if the last modified date is not known.
getHeaderField
public String getHeaderField(String name)
The getHeaderField
method returns the contents of the header field based on the specified
field name.
Parameters: name-a
String object specifying
the name of the header field to be returned.
Returns: A String
object containing the contents of the specified header field.
This value will be null if
the contents are not known.
getHeaderFieldInt
public int getHeaderFieldInt(String name,
int Default)
The getHeaderFieldInt
method returns the pre-parsed contents of the specified header
field.
Parameters:
name-a String
object specifying the name of the header field to be returned.
Default-an integer value
containing the value to be returned if the field is missing.
Returns: An integer value containing the preparsed
header field value.
getHeaderFieldDate
public long getHeaderFieldDate(String
name, long Default)
The getHeaderFieldDate
method returns the contents of the specified header field parsed
as a date.
Parameters:
name-a String
object specifying the name of the header field to be returned.
Default-an integer value
containing the value to be returned if the field is missing.
Returns: A long value containing the header field
value parsed as a date.
getHeaderFieldKey
public String getHeaderFieldKey(int n)
The getHeaderFieldKey
method returns the key for the specified header field.
Parameters: n-the
position of the header field to be returned.
Returns: A String
object containing the key for the specified header field. This
value will be null if there
are fewer than n header fields.
getHeaderField
public String getHeaderField(int n)
The getHeaderField
method returns the specified header field value.
Parameters: n-the
position of the header field to be returned.
Returns: A String
object containing the contents of the specified header field.
This value will be null if
there are fewer than n header fields.
getContent
public Object getContent() throws IOException
The getContent
method returns the object referred to by this URLConnection.
Returns: An Object
object that was referred to by this URL.
Throws: IOException
if an I/O error occurred while retrieving the content.
getInputStream
public InputStream getInputStream() throws
IOException
The getInputStream
method returns an InputStream
object to be used as an input stream to read from the object.
Returns: An InputStream
object to be used to read from the object.
Throws: IOException
if an I/O error occurred while creating the input stream.
getOutputStream
public OutputStream getOutputStream()
throws IOException
The getOutputStream
method returns an OutputStream
object to be used as an output stream to write to the object.
Returns: An OutputStream
object to be used to write to the object.
Throws: IOException
if an I/O error occurred while creating the output stream.
toString
public String toString()
The toString
method returns a string representation of the URLConnection.
Returns: A String
object containing a textual representation of the URLConnection
object.
setDoInput
public void setDoInput(boolean doinput)
The setDoInput
method sets the functionality of the URL connection. If the parameter
is true, the URL connection
will be used for input. If it is false,
it will be used for output.
Parameters: doinput-a
boolean value that will be true
if the URL connection is to be used for input; false
if for output.
setDoOutput
public void setDoOutput(boolean dooutput)
The setDoOutput
method sets the functionality of the URL connection. If the parameter
is true, the URL connection
will be used for output. If it is false,
it will be used for input.
Parameters: dooutput-a
boolean value that will be true
if the URL connection is to be used for output; false
if for input.
getDoOutput
public boolean getDoOutput()
The getDoOutput
method returns the input/output functionality of the URLConnection.
Returns: A boolean value that will be true
if the URL connection is used for output; false
if it is used for input.
setAllowUserInteraction
public void setAllowUserInteraction(boolean
allowuserinteraction)
The setAllowUserInteraction
method allows the protocol to interact with the user.
Parameters: allowuserinteraction-a
boolean value that should be true
if user interaction is allowed; false
if not.
getAllowUserInteraction
public boolean getAllowUserInteraction()
The getAllowUserInteraction
method can be called to determine if user interaction is allowed.
Returns: A boolean value that will be true
if user interaction is allowed; false
if not.
setDefaultAllowUserInteraction
public static void setDefaultAllowUserInteraction(
boolean defaultallowuserinteraction)
The setDefaultAllowUserInteraction
method allows the default user interaction value to be set for
all URL connections because it is a static method.
Parameters: defaultallowuserinteraction-a
boolean value that should be true
if user interaction is allowed; false
if not.
getDefaultAllowUserInteraction
public static boolean getDefaultAllowUserInteraction()
The getDefaultAllowUserInteraction
static method returns the default user interaction value.
Returns: A boolean value that will be true
if user interaction is allowed; false
if not.
setUseCaches
public void setUseCaches(boolean usecaches)
The setUseCaches
method is used to control the use of caching by the protocol.
Some protocols allow files to be cached.
Parameters: usecaches-a
boolean value that will be true
if caching is to be used by the protocol; false
if not.
getUseCaches
public boolean getUseCaches()
The getUseCaches
method can be called to determine if caching is to be used by
the protocol.
Returns: A boolean value that will be true
if caching is to be used by the protocol; false
if not.
setIfModifiedSince
public void setIfModifiedSince(long ifmodifiedsince)
The setIfModifiedSince
method is provided to set the internal ifmodifiedsince
variable of the URLConnection
class. Because some protocols allow caching of files, if the file
to be retrieved is newer than ifmodifiedsince,
it will need to retrieved from the URL (rather than the cache).
Parameters: ifmodifiedsince-a
long value used to represent the ifmodifiedsince
date.
getIfModifiedSince
public long getIfModifiedSince()
The getIfModifiedSince
method returns the internal ifmodifiedsince
date value. See the setIfModifiedSince
method documentation.
Returns: A long value representing the ifmodifiedsince
date value.
getDefaultUseCaches
public boolean getDefaultUseCaches()
The getDefaultUseCaches
method can be called to determine if caches are used by default.
Returns: A boolean value that will be true
if caches are used by default; false
if not.
setDefaultUseCaches
public void setDefaultUseCaches(boolean
defaultusecaches)
The setDefaultUseCaches
method can be used to force all URLConnections
to use caching by default because it is a static value.
Parameters: defaultusecaches-a
boolean value that should be true
if caches are to be used by default; false
if not.
setRequestProperty
public void setRequestProperty(String
key, String value)
The setRequestProperty
method is used to set URLConnection
properties.
Parameters:
key-a String
object containing the key by which the property is known.
value-a String
object containing the property value.
getRequestProperty
public String getRequestProperty(String
key)
The getRequestProperty
method returns the value for the specified property key.
Parameters: key-a
String object containing
the key by which the property is known.
Returns: A String
object containing the specified property's value.
setDefaultRequestProperty
public static void setDefaultRequestProperty(String
key, String value)
The setDefaultRequestProperty
method sets the default value of a specified property. All current
and future URL connections will be initialized with these properties.
Parameters:
key-a String
object containing the key by which the property is known.
value-a String
object containing the specified property's value.
getDefaultRequestProperty
public static String getDefaultRequestProperty(String
key)
The getDefaultRequestProperty
method gets the default value of a specified property.
Parameters: key-a
String object containing
the key by which the property is known.
Returns: A String
object containing the specified property's value.
setContentHandlerFactory
public static synchronized void setContentHandlerFactory(
ContentHandlerFactory fac)
The setContentHandlerFactory
method is used to set the ContentHandlerFactory
interface for this URL connection. The factory can only be set
once.
Parameters: fac-a
ContentHandlerFactory-derived
object.
Throws: Error
if the ContentHandlerFactory
has already been defined.
Extends: Object
The URLEncoder
class is used to encode text into x-www-form-urlencoded
format.
encode
public static String encode(String s)
The encode method
is used to translate a string into x-www-form-urlencoded
format.
Parameters: s-a
String object to be translated.
Returns: A String
object in x-www-form-urlencoded
format.
Extends: IOException
The MalformedURLException class is used to signal
a malformed URL.
Extends: IOException
This exception signals when a connect receives an
EPROTO message. This exception
is used by the Socket class.
Extends: IOException
This exception signals when an error has occurred
while trying to use a socket. This exception is used by the Socket
class.
Extends: IOException
This exception signals that the host address specified
by the client cannot be resolved.
Extends: IOException
This exception signals when an unknown service exception
has occurred.
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