Long description of Figure 1: How servlets work (rzahh585.gif)

found in IBM^® Toolbox for Java™: Servlet classes

This figure illustrates in a general way how servlets work.

Description

The figure is composed of the following:

• An image on the left of a personal computer, labeled 'Browser,' that represents an instance of a browser running on a personal computer.
• An image of an iSeries™ server on the right, labeled 'iSeries Data,' that represents the location of the data that you want the servlet to access.
• An image of an iSeries server in the middle (between the other two images), labeled 'WebServer,' that represents the Web server. Several labeled shapes on the WebServer image indicate files or functions that reside on the WebServer:
  • A green oval labeled Servlet that represents the location of the servlet code.
  • A tan circle labeled jt400Servlet that indicates the location of the jt400Servlet.jar file.
  • A tan circle labeled jt400 that indicates the location of the jt400.jar file.
  Note: The WebServer does not have to be on an iSeries server, but it can be, and can even be the same server as that indicated by the iSeries Data image.
• Lines that connect the images together.

A line labeled HTML connects the Browser (the left image) to a Servlet (the green oval) on the WebServer (middle image). The line is labeled HTML because servlets most often use HTML to 'serve' data to the browser.

The WebServer is running two IBM Toolbox for Java jar files (the tan circles), jt400Servlet.jar and jt400.jar. The classes in jt400Servlet.jar, along with the classes in jt400.jar, enable the WebServer to run a servlet that easily connects to servers that contain iSeries Data (the right image). The line with arrowheads on both ends that connects the two images indicates this connection.