- java.lang.Object
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- java.net.SocketAddress
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- java.net.InetSocketAddress
 
 
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- All Implemented Interfaces:
- Serializable
 
 public class InetSocketAddress extends SocketAddress This class implements an IP Socket Address (IP address + port number) It can also be a pair (hostname + port number), in which case an attempt will be made to resolve the hostname. If resolution fails then the address is said to be unresolved but can still be used on some circumstances like connecting through a proxy.It provides an immutable object used by sockets for binding, connecting, or as returned values. The wildcard is a special local IP address. It usually means "any" and can only be used for bindoperations.- Since:
- 1.4
- See Also:
- Socket,- ServerSocket, Serialized Form
 
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Constructor SummaryConstructors Constructor Description InetSocketAddress(int port)Creates a socket address where the IP address is the wildcard address and the port number a specified value.InetSocketAddress(String hostname, int port)Creates a socket address from a hostname and a port number.InetSocketAddress(InetAddress addr, int port)Creates a socket address from an IP address and a port number.
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Method SummaryAll Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static InetSocketAddresscreateUnresolved(String host, int port)Creates an unresolved socket address from a hostname and a port number.booleanequals(Object obj)Compares this object against the specified object.InetAddressgetAddress()Gets theInetAddress.StringgetHostName()Gets thehostname.StringgetHostString()Returns the hostname, or the String form of the address if it doesn't have a hostname (it was created using a literal).intgetPort()Gets the port number.inthashCode()Returns a hashcode for this socket address.booleanisUnresolved()Checks whether the address has been resolved or not.StringtoString()Constructs a string representation of this InetSocketAddress.
 
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Constructor Detail- 
InetSocketAddresspublic InetSocketAddress(int port) Creates a socket address where the IP address is the wildcard address and the port number a specified value.A valid port value is between 0 and 65535. A port number of zerowill let the system pick up an ephemeral port in abindoperation.- Parameters:
- port- The port number
- Throws:
- IllegalArgumentException- if the port parameter is outside the specified range of valid port values.
 
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InetSocketAddresspublic InetSocketAddress(InetAddress addr, int port) Creates a socket address from an IP address and a port number.A valid port value is between 0 and 65535. A port number of zerowill let the system pick up an ephemeral port in abindoperation.A nulladdress will assign the wildcard address.- Parameters:
- addr- The IP address
- port- The port number
- Throws:
- IllegalArgumentException- if the port parameter is outside the specified range of valid port values.
 
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InetSocketAddresspublic InetSocketAddress(String hostname, int port) Creates a socket address from a hostname and a port number.An attempt will be made to resolve the hostname into an InetAddress. If that attempt fails, the address will be flagged as unresolved. If there is a security manager, its checkConnectmethod is called with the host name as its argument to check the permission to resolve it. This could result in a SecurityException.A valid port value is between 0 and 65535. A port number of zerowill let the system pick up an ephemeral port in abindoperation.- Parameters:
- hostname- the Host name
- port- The port number
- Throws:
- IllegalArgumentException- if the port parameter is outside the range of valid port values, or if the hostname parameter is- null.
- SecurityException- if a security manager is present and permission to resolve the host name is denied.
- See Also:
- isUnresolved()
 
 
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Method Detail- 
createUnresolvedpublic static InetSocketAddress createUnresolved(String host, int port) Creates an unresolved socket address from a hostname and a port number.No attempt will be made to resolve the hostname into an InetAddress. The address will be flagged as unresolved. A valid port value is between 0 and 65535. A port number of zerowill let the system pick up an ephemeral port in abindoperation.- Parameters:
- host- the Host name
- port- The port number
- Returns:
- an InetSocketAddressrepresenting the unresolved socket address
- Throws:
- IllegalArgumentException- if the port parameter is outside the range of valid port values, or if the hostname parameter is- null.
- Since:
- 1.5
- See Also:
- isUnresolved()
 
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getPortpublic final int getPort() Gets the port number.- Returns:
- the port number.
 
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getAddresspublic final InetAddress getAddress() Gets theInetAddress.- Returns:
- the InetAddress or nullif it is unresolved.
 
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getHostNamepublic final String getHostName() Gets thehostname. Note: This method may trigger a name service reverse lookup if the address was created with a literal IP address.- Returns:
- the hostname part of the address.
 
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getHostStringpublic final String getHostString() Returns the hostname, or the String form of the address if it doesn't have a hostname (it was created using a literal). This has the benefit of not attempting a reverse lookup.- Returns:
- the hostname, or String representation of the address.
- Since:
- 1.7
 
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isUnresolvedpublic final boolean isUnresolved() Checks whether the address has been resolved or not.- Returns:
- trueif the hostname couldn't be resolved into an- InetAddress.
 
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toStringpublic String toString() Constructs a string representation of this InetSocketAddress. This String is constructed by calling toString() on the InetAddress and concatenating the port number (with a colon). If the address is unresolved then the part before the colon will only contain the hostname.
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equalspublic final boolean equals(Object obj) Compares this object against the specified object. The result istrueif and only if the argument is notnulland it represents the same address as this object.Two instances of InetSocketAddressrepresent the same address if both the InetAddresses (or hostnames if it is unresolved) and port numbers are equal. If both addresses are unresolved, then the hostname and the port number are compared. Note: Hostnames are case insensitive. e.g. "FooBar" and "foobar" are considered equal.- Overrides:
- equalsin class- Object
- Parameters:
- obj- the object to compare against.
- Returns:
- trueif the objects are the same;- falseotherwise.
- See Also:
- InetAddress.equals(java.lang.Object)
 
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hashCodepublic final int hashCode() Returns a hashcode for this socket address.- Overrides:
- hashCodein class- Object
- Returns:
- a hash code value for this socket address.
- See Also:
- Object.equals(java.lang.Object),- System.identityHashCode(java.lang.Object)
 
 
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