Adding Spring Web MVC part 2

Now I'll show you a couple of examples how it looks like a Controller & a JSP using Spring MVC.

From my personal perspective Defining a controller gives you a lot of power, because you can define a method to handle RequestMethod.GET, just to show a Form, and another method to handle the RequestMethod.POST to handle the "submit", cool isn't it?

import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; /** * Consumers Configuration Controller * * @author Juan Cruz */ @Controller @RequestMapping(value="/configuration/*") public class ConsumersConfigurationController extends BaseCustomController{ @Autowired private SomeInterfaceService myInstanceService; public ConsumersConfigurationController() { //You can intialize something or just use } @RequestMapping(value = "showConsumersConfiguration.do") public String showConsumersConfiguration(HttpServletRequest request, HttpServletResponse response, ModelMap modelMap) { if(!this.isLoggedIn(request)){ return "redirect:/authentication/logout.do"; } log.debug("showConsumersConfiguration"); modelMap.put("KEY_LIST_EAST_SERVERS", listEastServers); modelMap.put("KEY_LIST_WEST_SERVERS", listWestServers); modelMap.put("KEY_LIST_NORTH_SERVERS", listNorthServers); return "configuration/consumersConfiguration";//show jsp }

By adding @Controller you already told Spring, "hey this dude is going to be a Controller".

@RequestMapping(value="/configuration/*") means: "If my URL is WebContext/configuration/ this Controller is going to handle the Request"

Then on each method I can define my path below /configuration/ @RequestMapping(value = "showConsumersConfiguration.do"), something like this WebContext/configuration/showConsumersConfiguration.do

I almost forgot @Autowired which is for inject implementation of that Bean

If you want to handle an object like a form (bind an object to a form), check this out

<%@taglib prefix="spring" uri="http://www.springframework.org/tags" %> <%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <form:form id="loginForm" name="loginForm" modelAttribute="UserVO" action="doLogin.do" method="post"> <table width="100%"> <tr> <td><label for="userId">Login</label></td> <td><form:input path="userId" size="20" title="By default you will see your US-WIN."/></td> </tr> <tr> <td><label for="password">Password</label></td> <td><form:password path="password" size="20" title="Enter your US-WIN password."/></td> </tr> </table> <p> <input type="submit" value="Authenticate"> </p> <form:hidden path="email"/> <form:hidden path="firstName"/> <form:hidden path="lastName"/> </form:form>

Important, include these tag libraries!

By using this attribute modelAttribute="UserVO" of form:form tag, I'm binding this line of my controller: modelMap.put("UserVO", userVO); with my form

public class UserVO implements Serializable { private String userId; private String password; private String email; private String firstName; private String lastName; }

If you see carefully, each attribute of my VO, has a reference on my JSP, at least as hidden field, but all of them are there

@Controller @RequestMapping(value = "/authentication/*") public class LoginController extends BaseCustomController{ @RequestMapping(value = "doLogin.do") public String authenticateUser(HttpServletRequest request, HttpServletResponse response, ModelMap modelMap, @ModelAttribute UserVO paramUserVO) { } @RequestMapping(value = "login.do") public String showLogin(HttpServletRequest request, HttpServletResponse response, ModelMap modelMap) { UserVO userVO = new UserVO(); modelMap.put("UserVO", userVO); return "authentication/login";//show jsp }

Now my form has been binded to my VO @ModelAttribute UserVO paramUserVO

Now you're ready to play around with this thing!!!

Always go to the official documentation to get more details!!!