Java-WebSocket Source Code Files are provided in the source package file, java-websocket-1.5.4-src.zip.

You can download httpcomponents-client-5.2-src.zip as described in the previous tutorial and go to the "src" sub-folder to view Source Code files.

You can also browse HttpComponents Client Source Code files below:

⏎ org/java_websocket/framing/PingFrame.java

/*
 * Copyright (c) 2010-2020 Nathan Rajlich
 *
 *  Permission is hereby granted, free of charge, to any person
 *  obtaining a copy of this software and associated documentation
 *  files (the "Software"), to deal in the Software without
 *  restriction, including without limitation the rights to use,
 *  copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the
 *  Software is furnished to do so, subject to the following
 *  conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *  OTHER DEALINGS IN THE SOFTWARE.
 */

package org.java_websocket.framing;

import org.java_websocket.enums.Opcode;

/**
 * Class to represent a ping frame
 */
public class PingFrame extends ControlFrame {

  /**
   * constructor which sets the opcode of this frame to ping
   */
  public PingFrame() {
    super(Opcode.PING);
  }
}

⏎ org/java_websocket/framing/PingFrame.java

Or download all of them as a single archive file:

File name: java-websocket-1.5.4-fyi.zip
File size: 153990 bytes
Release date: 2022-07-04
Download 

⇒ Download and Install javax.websocket-api-1.1.jar

⇐ Download Java-WebSocket Implementation

⇑ Downloading and Reviewing WebSocket.jar

⇑⇑ FAQ for WebSocket API