Package org.apache.commons.net

Class WhoisClient

java.lang.Object

org.apache.commons.net.SocketClient

org.apache.commons.net.FingerClient

org.apache.commons.net.WhoisClient

public final class WhoisClient
extends FingerClient

The WhoisClient class implements the client side of the Internet Whois Protocol defined in RFC 954. To query a host you create a WhoisClient instance, connect to the host, query the host, and finally disconnect from the host. If the whois service you want to query is on a non-standard port, connect to the host at that port. Here's a sample use:

    WhoisClient whois;

    whois = new WhoisClient();

    try {
      whois.connect(WhoisClient.DEFAULT_HOST);
      System.out.println(whois.query("foobar"));
      whois.disconnect();
    } catch(IOException e) {
      System.err.println("Error I/O exception: " + e.getMessage());
      return;
    }
 

Author:

Daniel F. Savarese

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	DEFAULT_HOST	The default whois host to query.
static int	DEFAULT_PORT	The default whois port.

Fields inherited from class org.apache.commons.net.SocketClient

_defaultPort_, _input_, _isConnected_, _output_, _socket_, _socketFactory_, _timeout_, NETASCII_EOL

Constructor Summary

Constructors

Constructor	Description
WhoisClient()	The default whois constructor.

Method Summary

Modifier and Type	Method	Description
java.io.InputStream	getInputStream(java.lang.String handle)	Queries the connected whois server for information regarding the given handle and returns the InputStream of the network connection.
java.lang.String	query(java.lang.String handle)	Queries the connected whois server for information regarding the given handle.

Methods inherited from class org.apache.commons.net.FingerClient

getInputStream, getInputStream, query, query

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from class org.apache.commons.net.SocketClient

_connectAction_, connect, connect, connect, connect, connect, connect, disconnect, getDefaultPort, getDefaultTimeout, getLocalAddress, getLocalPort, getRemoteAddress, getRemotePort, getSoLinger, getSoTimeout, getTcpNoDelay, isConnected, setDefaultPort, setDefaultTimeout, setSocketFactory, setSoLinger, setSoTimeout, setTcpNoDelay, verifyRemote

Field Detail

DEFAULT_HOST

public static final java.lang.String DEFAULT_HOST

The default whois host to query. It is set to whois.internic.net.

See Also:

Constant Field Values

DEFAULT_PORT

public static final int DEFAULT_PORT

The default whois port. It is set to 43 according to RFC 954.

See Also:

Constant Field Values

Constructor Detail

WhoisClient

public WhoisClient()

The default whois constructor. Initializes the default port to DEFAULT_PORT .

Method Detail

query

public java.lang.String query(java.lang.String handle)
                       throws java.io.IOException

Queries the connected whois server for information regarding the given handle. It is up to the programmer to be familiar with the handle syntax of the whois server. You must first connect to a whois server before calling this method, and you should disconnect afterward.

Parameters:

handle - The handle to lookup.

Returns:

The result of the whois query.

Throws:

java.io.IOException - If an I/O error occurs during the operation.

getInputStream

public java.io.InputStream getInputStream(java.lang.String handle)
                                   throws java.io.IOException

Queries the connected whois server for information regarding the given handle and returns the InputStream of the network connection. It is up to the programmer to be familiar with the handle syntax of the whois server. You must first connect to a finger server before calling this method, and you should disconnect after finishing reading the stream.

Parameters:

handle - The handle to lookup.

Returns:

The InputStream of the network connection of the whois query. Can be read to obtain whois results.

Throws:

java.io.IOException - If an I/O error occurs during the operation.