commons-net.jar is the bytecode of Apache Commons Net library, which implements the client side of many basic Internet protocols.

Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.

The source code of commons-net-3.8.0.jar is provided below:

⏎ org/apache/commons/net/daytime/DaytimeTCPClient.java

/*
 * 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.daytime;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.commons.net.SocketClient;

/**
 * The DaytimeTCPClient class is a TCP implementation of a client for the
 * Daytime protocol described in RFC 867.  To use the class, merely
 * establish a connection with
 * {@link org.apache.commons.net.SocketClient#connect  connect }
 * and call {@link #getTime  getTime() } to retrieve the daytime
 * string, then
 * call {@link org.apache.commons.net.SocketClient#disconnect  disconnect }
 * to close the connection properly.
 * @see DaytimeUDPClient
 */
public final class DaytimeTCPClient extends SocketClient
{
    /** The default daytime port.  It is set to 13 according to RFC 867. */
    public static final int DEFAULT_PORT = 13;

    // Received dates will likely be less than 64 characters.
    // This is a temporary buffer used while receiving data.
    private final char[] buffer = new char[64];

    /**
     * The default DaytimeTCPClient constructor.  It merely sets the default
     * port to <code> DEFAULT_PORT </code>.
     */
    public DaytimeTCPClient ()
    {
        setDefaultPort(DEFAULT_PORT);
    }

    /**
     * Retrieves the time string from the server and returns it.  The
     * server will have closed the connection at this point, so you should
     * call
     * {@link org.apache.commons.net.SocketClient#disconnect  disconnect }
     * after calling this method.  To retrieve another time, you must
     * initiate another connection with
     * {@link org.apache.commons.net.SocketClient#connect  connect }
     * before calling <code> getTime() </code> again.
     *
     * @return The time string retrieved from the server.
     * @throws IOException  If an error occurs while fetching the time string.
     */
    public String getTime() throws IOException
    {
        int read;
        final StringBuilder result = new StringBuilder(buffer.length);
        final BufferedReader reader;

        reader = new BufferedReader(new InputStreamReader(_input_, getCharset()));

        while (true)
        {
            read = reader.read(buffer, 0, buffer.length);
            if (read <= 0) {
                break;
            }
            result.append(buffer, 0, read);
        }

        return result.toString();
    }

}

⏎ org/apache/commons/net/daytime/DaytimeTCPClient.java

Or download all of them as a single archive file:

File name: commons-net-3.8.0-sources.jar
File size: 437325 bytes
Release date: 2020-01-22
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