Java Web Services: Up and Running, 2nd Edition

A First RESTful Example

As befits a first example, the implementation is simple but sufficient to highlight key aspects of a RESTful web service. The implementation consists of a JSP (Java Server Pages) script and two backend JavaBeans that the JSP script uses to get the data returned to the client (see Figure 1-6). The data is composed of sage corporate predictions. Here is a sample:

Decentralized 24/7 hub will target robust web-readiness.
Synergistic disintermediate policy will expedite backend experiences.
Universal fault-tolerant architecture will synthesize bleeding-edge channels.

Figure 1-6. The organization of the predictions web service

There is an Ant script (see An Ant script for service deployment) that automates the deployment of this and other service examples. Here is a summary of the service parts and how the Ant script puts the parts together:

1. The service consists of a JSP script together with two POJO (JavaBean) classes. The classes provide backend support for the JSP script. There is also a small configuration file, web.xml, that allows the URI to be shortened from:

   /predictions/predictions.jsp

   to:

   /predictions/

2. The Ant script compiles the .java files and then packages the JSP script, the compiled .class files, and—only for convenience—the .java files into a JAR file with a .war extension (hereafter, a WAR file).
3. The WAR file is copied to the Tomcat webapps subdirectory, ...