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L22 (Chapter 25) Networking 1

L22 (Chapter 25) Networking 1. Objectives. To comprehend socket-based communication in Java (§25.2). To understand client/server computing (§25.2). To implement Java networking programs using stream sockets (§25.2). To obtain Internet address using the InetAddress class (§25.3).

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L22 (Chapter 25) Networking 1

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  1. L22 (Chapter 25) Networking 1

  2. Objectives • To comprehend socket-based communication in Java (§25.2). • To understand client/server computing (§25.2). • To implement Java networking programs using stream sockets (§25.2). • To obtain Internet address using the InetAddress class (§25.3). • To develop servers for multiple clients (§25.4). • To develop applets that communicate with the server (§25.5). • To send and receive objects on the network (§25.6). • To create applications or applets to retrieve files from the network (§25.7). • To render HTML files using the JEditorPane class (§25.8). • To implement Java networking programs using datagram sockets (§25.10 Optional).

  3. After the server accepts the connection, communication between server and client is conducted the same as for I/O streams. The server must be running when a client starts. The server waits for a connection request from a client. To establish a server, you need to create a server socket and attach it to a port, which is where the server listens for connections. After a server socket is created, the server can use this statement to listen for connections. The client issues this statement to request a connection to a server. Client/Server Communications

  4. Data Transmission through Sockets InputStream input = socket.getInputStream(); OutputStream output = socket.getOutputStream();

  5. A Client/Server Example • Problem: Write a client to send data to a server. The server receives the data, uses it to produce a result, and then sends the result back to the client. The client displays the result on the console. In this example, the data sent from the client is the radius of a circle, and the result produced bythe server is the area of the circle.

  6. A Client/Server Example, cont.

  7. A Client/Server Example, cont. Client Code Server Code Start Client Start Server Note: Start the server, then the client.

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