Java servlets

In Model 2 MVC, JavaServer Pages only play the role of View. The Controller role is played by a Java Servlet. Figure 11.2 is a typical Model 2 MVC. 

K2 is implemented as a multithreaded server that can handle multiple client connections. Clients communicate with the server using either Remote Method Invocation, Internet Inter-Orb Protocol, or an ad hoc socket protocol. In addition to a set of client libraries that simplify accessing K2 from any Web application that uses Java servlets, a chent that provides interactive command line access to the system has been implemented. 

Sun Microsystems also created Java servlets to allow more interaction with dynamic, graphical Web pages written in Java. However, although these servlets work very well with Java, they also must be compiled as classes before execution, which takes extra time. 

This article shows how a formerly stand-alone software simulation tool was extended by an internet client and an interface without expensive middleware software. Also the intense cost of large implementation teams can be saved. The software Hybrex WEB presented in this article shows how this can be done by using standards like Java servlets, Java beans and CORBA / RMI. Hybrex WEB was developed by Siemens AG, I S IP PEP in close cooperation with the Technical University of Berlin, Institute for Process Dynamics and Control. 

Forms Created with servlets (Java) or CGI and Perl. 

The simulation request broker may be contacted by other Java applications directly using the standard RMI interface shipped with all Java versions. Like this, the web server s servlets communicate with the broker very easily. 

---