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!!!

Adding Spring Web MVC

I'll try to be brief.

Basically, you need to add a new Servlet on you web.xml, a configuration file (let's call it webApplicationContext.xml) and some Annotations.

This is my example:

My web.xml <servlet> <servlet-name>webApplicationContext</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/conf/spring/webApplicationContext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>webApplicationContext</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping>

The framework will, on initialization of a DispatcherServlet, look for a file named [servlet-name]-servlet.xml (webApplicationContext-servlet.xml) in WEB-INF by default, but if you provide parameter "contextConfigLocation" you can define a location and name for your configuration file.

My webApplicationContext.xml <?xml version="1.0" encoding="UTF-8" ?> <beans xmlns = "http://www.springframework.org/schema/beans" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns:context = "http://www.springframework.org/schema/context" xsi:schemaLocation = "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <!--================== Annotation config =====================--> <context:annotation-config/> <!--================== Location of Controllers =====================--> <context:component-scan base-package = "com.vzw.common.gsbsocketapp.web.controller"/> <!--================== InternalResourceViewResolver =====================--> <bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name = "viewClass" value = "org.springframework.web.servlet.view.JstlView"/> <property name = "prefix" value = "/jsp/"/> <property name = "suffix" value = ".jsp"/> </bean> </beans>

Which basically is divided in 3 sections:

• We're going to use configuration based onn annotations
• Location of my Controllers
• And where are located my JSP's

In my next entry I'll cover how it looks like a Controller & JSP.