Commons Net example source code file (WhoisClient.java)

This example Commons Net source code file (WhoisClient.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Net tags/keywords

default_host, default_port, fingerclient, inputstream, inputstream, io, ioexception, ioexception, string, string, whoisclient, whoisclient

The Commons Net WhoisClient.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.net.whois;

import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.net.finger.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:
 * <pre>
 *    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;
 *    }
 * </pre>
 *
 * <p>
 * <p>
 ***/

public final class WhoisClient extends FingerClient
{
    /***
     * The default whois host to query.  It is set to whois.internic.net.
     ***/
    public static final String DEFAULT_HOST = "whois.internic.net";

    /***
     * The default whois port.  It is set to 43 according to RFC 954.
     ***/
    public static final int DEFAULT_PORT = 43;


    /***
     * The default whois constructor.    Initializes the
     * default port to <code> DEFAULT_PORT .
     ***/
    public WhoisClient()
    {
        setDefaultPort(DEFAULT_PORT);
    }

    /***
     * 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.
     * <p>
     * @param handle  The handle to lookup.
     * @return The result of the whois query.
     * @exception IOException  If an I/O error occurs during the operation.
     ***/
    public String query(String handle) throws IOException
    {
        return query(false, handle);
    }


    /***
     * 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.
     * <p>
     * @param handle  The handle to lookup.
     * @return The InputStream of the network connection of the whois query.
     *         Can be read to obtain whois results.
     * @exception IOException  If an I/O error occurs during the operation.
     ***/
    public InputStream getInputStream(String handle) throws IOException
    {
        return getInputStream(false, handle);
    }

}