1 . Install JDK 7 or higher, Maven and GIT
2 . On your terminal, run git clone https://github.com/pugnusferreus/spring-rest.git
3 . In the spring-rest folder, run mvn -e jetty:run -Djetty.port=8080
4 . On your browser, go to http://localhost:8080/rest/someEndPoint and you’ll get the following response {"key":"Hello from a manager!"}.
I’ll not explain step by step on how to wire up all these since there are a dozen of articles on how to wire up a REST application with Spring 4. I’ll be highlighting on the things that we should be looking at.
Configuration
1 . src/main/webapp/WEB-INF/web.xml basically tells your Java Web App on which spring context it should use and the URL pattern mapping. In this example, we want to configure all our REST calls with /rest/*.
2 . src/main/webapp/WEB-INF/applicationContext.xml and src/main/webapp/WEB-INF/manager-context.xml is where we declare our spring beans. I deliberately separate them up so that manager classes will be declared in the manager-context.xml.
3 . src/main/resources/log4j2.xml is where we configure our logging. We’re using Log4J2 in this example. This XML tells LOG4J to log spring-rest.log and to the terminal console.
4 . pom.xml is our Maven build file.
Source
1 . com.progriff.managers.TestManager is our manager class. We should always put our business logic in a manager class.
2 . com.progriff.controllers.TestController is our controller. Note that there is an @Autowired on top of the TestManager class. Spring will automatically wire up TestManager with TestController. Do note that your variable name must be the same as the bean id in the manager-context.xml file.
3 . In TestController, for each methods that are to be mapped to a URL, we’ll need @RequestMapping and @ResponseBody. You can set the REST URL path, Request Method and the Media Type that this REST will produce in the @RequestMapping annotation. Do note that when we return the java.util.Map in that method, Jackson will automatically convert the object into JSON.