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Physical layer: Defines the type of medium, the transmission method, and the rates available for the network. Some networks have broadband communication, measured in megabits per second, whereas others have narrower communication in the kilobit range or less. Because of the wide variance in bandwidth, different behavior can be expected, and applications that implement network protocols have to be aware of this. Thus, the physical layer has to be able to provide this data to the next layer up, and respond to command instructions from it. You can see this seven-layer model, and how typical TCP/IP applications such as the web browser fit into it, in Figure 1-1.

file (jfreechart-0.9.17.jar). From the JFreeChart distribution s lib directory, we also use the gnujaxp.jar, log4j-1.2.8.jar, and jcommon-0.9.2.jar files. JFreeChart provides charts for Swing applications, applets, servlets, portlets, or other types of Java applications. The JFreeChart software does not offer any direct support for the portlet API or portal behavior. In this chapter, we focus on understanding how to use the JFreeChart API; then we create a portlet application that displays charts generated with JFreeChart. Our charting portlet creates temporary files for our charts, and a servlet serves the image files to the user.

That s it. You ve just completed the three parts of a remoting application. To test the application, you need to follow a specific sequence: 1. Run the console application. 2. Run the client application. 3. Enter a valid employee ID and click the Show button. Figure 11-3 shows the console application window after the GetEmployee() method call has been made. Notice the message that reads, Inside Employee Constructor. We outputted this message from the constructor of the Employee class. After making a call to the GetEmployee() method, this message is shown in the console window. This proves that it was the remote component that was called and not the local copy.

The common chart types are included with JFreeChart, including bar, pie, area, scatter plots, time series, and area charts. Variations are possible with each chart type, and it is also possible to create 3D pie charts and bar charts. JFreeChart comes with a charting demo application (jfreechart-0.9.17-demo.jar) that has examples of the various charts and styles. You can run the demo application from the root directory of the JFree distribution with this command line (adjust the slashes for your OS if it is not Windows):

This model provided the foundation for what would become the Internet, and the Internet provided the foundation for what would become the World Wide Web. By using TCP/IP, it became possible to build first a file transfer protocol (FTP) and ensuing application. From there, Tim Berners-Lee expanded the idea to having a live view of the file in an application called a browser. Instead of just transferring a document from a distant machine to your own, the application would also render the file. To do this, the file would need to be marked up in a special way that could be understood by the browser. A natural progression to this is to allow documents to be linked to each other, so that when the user selects a link, they are taken to the document that the link refers to. This introduced the concept of hypertext, and thus HTML (Hypertext Markup Language) was invented.

java -cp lib\gnujaxp.jar;lib\jcommon-0.9.2.jar;lib\log4j-1.2.8.jar ;lib\servlet.jar;jfreechart-0.9.17.jar -jar jfreechart-0.9.17-demo.jar

Note You might be wondering why we referenced the EmployeeServer in the client application when it