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Spring MVC Basics
This document summarizes the basics of Spring MVC, including the model-view-controller (MVC) pattern it uses. It describes the main components - the model which contains application data, the view which displays data to the user, and the controller which handles requests and coordinates the model and view. It provides examples of how controllers work using annotations like @RequestMapping and how they can return different types of responses. It also briefly mentions other related concepts like interceptors, exceptions, and static resources.
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Spring MVC Basics
- 1. Spring-MVC Basics BozhidarBozhanov Bulgarian Association of Software Developers www.devbg.org http://techblog.bozho.net
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- 3. Model Map<String, Object>Populated by controllers Contains all data needed by the „view“ Not containing business logic model.addAttribute("orders", orderService.getDailyOrders(user)); model.addAttribute("period", Period.DAILY);
- 4. View HTML, XML,RSS, PDF, etc... JSP, Freemarker, Velocity, etc Direct access to the model <span> ${latestOrder.date} <span> <input type="text" value=" ${order.name} " />
- 5. Controller Gathers inputparameters and coordinates the back-end process Front controller vs controller @Controller RESTful URLs, request-process-forward, @RequestMapping Method=Action Unit-test friendly Pluggable mechanism for argument resolution
- 6. Controller Gathers inputparameters and coordinates the back-end process Front controller vs controller @Controller RESTful URLs, request-process-forward, @RequestMapping Method=Action Unit-test friendly Pluggable mechanism for argument resolution
- 7. Controller @Controller @RequestMapping("/users")public class UserController { @Inject private UserService service ; @RequestMapping("/login") public String login(@RequestParam String username, @RequestParam String pass){ User u = service.login(username, pass); return "welcomePage"; } @RequestMapping("/view/{username}") public String view(@PathVariable String username){ User u = service.find(username); ... return "userPage"; } }
- 8. Controller arguments @RequestParam,@PathVariable POJO – arbitrary java object that gets populated with request values @Valid – to enforce validation of the POJO BindingResult – to access the results of binding and validation Model, ModelMap, Map<String, ?> - acces to the model object Raw HttpServletRequest, response, session Locale, @RequestHeader, @RequestBody,....
- 9. Controllers – returntypes String, View, ModelAndView – use a “view“ @ResponseBody – any object @Controller @RequestMapping("/users") public class UserController { @Inject private UserService service ; @RequestMapping(value="/ajaxView" consumes="application/json") @ResponseBody public User view(@RequestParam String username){ User u = service.find(username); return user; } }
- 10. More... Interceptors Exceptionhandling Binding and validation customization Static resource handling Caching configuration Locale and theme resolution Multipart handling Flash scope, conversation scope (web flow)
- 11. The lifecycle onceagain Source: http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/mvc.html
- 12. Demo (spring mvcshowcase)
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