![]() ![]() ![]() It also has which means that the method will be invoked when a GET request is received for this URL. See REST with Spring course by Eugen to learn how to develop RESTful Web Service using Spring in depth.įor example, the below class is a Controller that will process any request having URI "/appointments". It can also use specific request processing annotations like or Controller classes are also identified using and (in the case of RESTful Web Services) annotations. Well, it uses the annotation or Spring MVC configuration file to find out the mapping of the request URL to different controllers. How does DispatcherServlet know which request needs to be passed to which controller? The DispatcherServlet passes the request to a specific controller depending on the URL requested. The URL pattern is important, if the request matches the URL pattern of DispatcherServlet then it will be processed by Spring MVC otherwise not. WEB-INF/config/web-application-config.xml Here is the web.xml configuration for Spring MVC, you can see that DispatcherServlet is mapped to all request using URL pattern * It' also the most up-to-date and covers Spring 5. If you need recommendations, I highly suggest you take a look at Spring Framework 5: Beginner to Guru, one of the comprehensive and hands-on courses to learn modern Spring. Though it is not mandatory, you can have other servlet mapped to other URL if you want to, but if you are using Spring MVC to develop a web application or RESTful web service, it makes sense to pass through all requests via DispatcherServlet.īy the way, if you are new to the Spring framework then I also suggest you join a comprehensive and up-to-date course to learn Spring in depth. This Servlet listens for a URL pattern * as shown in below web.xml, which means all request is mapped to DispatcherServlet. If you remember, to enable Spring MVC, we need to declare the DispatcherServlet from the Spring MVC jar into web.xml. In the case of an HTTP request, HttpServlet handles that, and depending upon the HTTP request method various doXXX() method is invoked by container like doGet() to process GET request and doPost() to process POST request. Remember, Web container like Tomcat is responsible for creating Servlet and Filter instances and invoking their various life-cycle methods like init(), service(), destroy(). Since Spring MVC is built on top of Servlet, this is also the initial flow of requests in any Spring MVC based Java web application. It the delegate that Servlet or Filter to process the request. When that request hits the web container like Tomcat it looks into web.xml and finds the Servlet or Filter which is mapped to that particular URL. It all starts with the client, which sends a request to a specific URL. Since many of my readers ask this question time and again, I thought to summarize the flow of request processing in a short article. In other words, explaining the flow of requests in Spring MVC. Most of these courses can be taken online and provided by trusted online training providers like Pluralsight, Udemy, etc. ![]() In this article, I'll share some of the best online courses to learn Spring, Spring MVC, Spring REST, Spring Security, and Spring Boot framework. how an HTTP request is processed from start to end. 6 Best Courses to Learn Spring Framework in Depth. One of the frequently asked Spring MVC Interview questions is about explaining the flow of web requests i.e. ![]()
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