Spring MVC Basics

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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.

Spring-MVC Basics Bozhidar Bozhanov Bulgarian Association of Software Developers www.devbg.org http://techblog.bozho.net

MVC Source: http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/mvc.html

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);

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} " />

Controller Gathers input parameters 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

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"; } }

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,....

Controllers – return types 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; } }

More... Interceptors Exception handling Binding and validation customization Static resource handling Caching configuration Locale and theme resolution Multipart handling Flash scope, conversation scope (web flow)

The lifecycle once again Source: http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/mvc.html

Resources http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/mvc.html http://static.springsource.org/docs/petclinic.htmlhttps://github.com/SpringSource/spring-mvc-showcase

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Spring MVC Basics

1. Spring-MVC Basics Bozhidar Bozhanov Bulgarian Association of Software Developers www.devbg.org http://techblog.bozho.net

2. MVC Source: http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/mvc.html

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 input parameters 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 input parameters 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 – return types 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 Exception handling Binding and validation customization Static resource handling Caching configuration Locale and theme resolution Multipart handling Flash scope, conversation scope (web flow)

11. The lifecycle once again Source: http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/mvc.html

12. Demo (spring mvc showcase)

13. Resources http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/mvc.html http://static.springsource.org/docs/petclinic.htmlhttps://github.com/SpringSource/spring-mvc-showcase

14. Questions ?

Spring MVC Basics

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