Source Code in This Chapter

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• NetworkClientTest.java Makes a simple connection to the host and port specified on the command line. Uses the following classes:
  • NetworkClient.java Starting point for a network client to communicate with a remote computer.
  • SocketUtil.java Provides utilities for wrapping a BufferedReader around the Socket's input stream and a PrintWriter around the Socket's output stream.
• TokTest.java Illustrates parsing a string with a StringTokenizer.
• SplitTest.java Illustrates parsing a string with a String.split.
• AddressVerifier.java Connects to an SMTP server and issues a expn request to display details about a mailbox on the server. Uses the following classes:
  • MailAddress.java Separates the user and host components of an email address.
  • NetworkClient.java Starting point for a network client to communicate with a remote computer.
  • SocketUtil.java Provides utilities for wrapping a BufferedReader and PrintWriter around the Socket's input and output streams, respectively.
• UriRetriever.java Accepts a host, port, and file from the command line and retrieves the implied URL from the HTTP server by issuing a GET request. Uses the following classes:
  • NetworkClient.java Starting point for a network client to communicate with a remote computer.
  • SocketUtil.java Provides utilities for wrapping a BufferedReader and PrintWriter around the Socket's input and output streams, respectively.
• UrlRetriever.java Accepts an URL from the command line, parses the host, port, and URI components from the URL and then retrieves the document. Requires the following classes:
  • UriRetriever.java Given a host, port, and URI, retrieves the document from the HTTP server.
  • NetworkClient.java Starting point for a network client to communicate with a remote computer.
  • SocketUtil.java Provides utilities for wrapping a BufferedReader and PrintWriter around the Socket's input and output streams, respectively.
• UrlRetriever2.java Illustrates how the URL class can simplify communication to an HTTP server.
• UrlTest.java Demonstrates the ease in which the various components of an URL can be determined (host, port, protocol, etc.).
• WebClient - Client application that can talk interactively to Web servers. Requires the components listed below.
  • WebClient.java Top-level class that communicates interactively to HTTP servers.
  • HttpClient.java Handles the underlying network communication.
  • LabeledTextField.java A labeled text field for the WebClient graphical user interface.
  • Interruptible.java Polls to see if the user choose to interrupt the current network download.
  • NetworkClient.java Starting point for a network client to communicate with a remote computer.
  • SocketUtil.java Provides utilities for wrapping a BufferedReader and PrintWriter around the Socket's input and output streams, respectively.
  • WindowUtilities.java Simplifies the setting of native look and feel.
  • ExitListener.java WindowListener for applications in this chapter.
  • Note: webclient.jar includes all files required for the WebClient example.
• Implementing a Server
  • NetworkServerTest.java Establishes a network Server that listens for client requests on the port specified (command-line argument). Uses the following classes:
    • NetworkServer.java A starting point for network servers.
    • SocketUtil.java Simplifies the creation of a PrintWriter and BufferedReader.
  • EchoServer.java A simple HTTP server that creates a Web page showing all data sent from the client (browser), including all HTTP request headers sent form the client. Uses the following classes:
    • NetworkServer.java A starting point for network servers.
    • SocketUtil.java Simplifies the creation of a PrintWriter and BufferedReader.
    • Note: echoserver.jar contains all required files for the EchoServer example (includes ThreadedEchoServer.java).
  • ThreadedEchoServer.java A multithreaded version of EchoServer, where each client request is serviced on a separate thread. Requires the following classes:
    • EchoServer.java Creates a Web page showing all data sent from the client (browser).
    • NetworkServer.java A starting point for network servers.
    • SocketUtil.java Simplifies the creation of a PrintWriter and BufferedReader.
• Remote Method Invocation
  • RMI Example - Message, illustrates retrieving a message from an object located on a remote server. Requires the following classes:
    • Rem.java Establishes which methods the client can access in the remote object.
    • RemClient.java The client application which communicates to the remote object and retrieves the message.
    • RemImpl.java The concrete, remote object that implements the methods in Rem.java.
    • RemServer.java Creates an instance of RemImpl on the remote server and binds the object in the registry for lookup by the client.
    • Note: rmi-message.jar contains all required files for RMI Message example.
  • RMI Example - Numerical Integration, a more realistic RMI example that sends an evaluatable object (function) from a client to a server for numerical integration.
    • Integral.java Performs actual numerical integration of the function (evaluatable object).
    • Evaluatable.java An interface for evaluating functions. Requires the Evaluatable object to implement the evaluate method.
    • RemoteIntegral.java Establishes the methods in the remote object available to the client.
    • RemoteIntegralClient.java The client that sends an Evaluatable object to the remote server for integration.
    • Sin.java Evaluatable version of sin(x).
    • Cos.java Evaluatable version of cos(x).
    • Quadratic.java Evaluatable version of x².
    • RemoteIntegralImpl.java The remote object which provides a concrete implementation of the RemoteIntegral interface.
    • RemoteIntegralServer.java Creates an instance of RemoteIntegralImpl on the remote server and binds the object in the registry for lookup by the client.
    • RemoteIntegralClient2.java An enterprise version of the client that imposes a security manager to support the Java 2 RMI 1.2 stub protocol.
      • rmiclient.policy Policy file for the client. Grants permissions for the client to connect to the RMI server and Web server.
    • Note: rmi-integral.jar contains all required files for RMI Integral example.