TechnoBuzz

A Techno Blog, mainly about Java

Spring MVC refresher

web.xml:

application context Beans makeup the configuration of the root web application context
< context-param >
< param-name >contextConfigLocation< /param-name >
< param-value >/WEB-INF/accounts-application-config.xml< /param-value >
< /context-param >

Bootstraps the root web application context before servlet initialization
< listener >
< listener-class >org.springframework.web.context.ContextLoaderListener< /listener-class >
< /listener >

Deploys the dispatcher servlet along with its configuration
< servlet >
< servlet-name >accounts< /servlet-name >
< servlet-class >org.springframework.web.servlet.DispatcherServlet< /servlet-class >
< init-param >
< param-name >contextConfigLocation< /param-name >
< param-value >/WEB-INF/accounts-servlet-config.xml< /param-value >
< /init-param >
< /servlet >
accounts-servlet-config.xml:

< context:component-scan base-package=”accounts.web” />

< mvc:annotation-driven/ >

An interceptor which keeps a hibernate session open to allow lazy loading of backing object
< mvc:interceptors >
< bean class=”org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor” >
< property name=”sessionFactory” ref=”sessionFactory”/ >
< /bean >
< /mvc:interceptors >
< bean class=”org.springframework.web.servlet.view.InternalResourceViewResolver” >
< property name=”prefix” value=”/WEB-INF/views/”/ >
< property name=”suffix” value=”.jsp”/ >
< /bean >

Note: if had not have used component scanning would have had to wire up the controller

A Spring MVC @Controller

imports:
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

package accounts.web;

@Controller
public class AccountController {

private AccountManager accountManager;

@ Autowired
public AccountController(AccountManager accountManager) {
this.accountManager = accountManager;
}

The method does not explicitly select a view name because the default
view name selected by Spring MVC matches to the incoming URL accountDetails.jsp
@ param id the id of the account
@ param model the “implicit” model created by Spring MVC

@ RequestMapping(“/accountDetails”)
public void accountDetails(@RequestParam(“entityId”) int id, Model model) {
model.addAttribute(“account”, accountManager.getAccount(id));
}

The method does not explicitly select a view name because the default
view name selected by Spring MVC matches to the incoming URL accountSummary.jsp

@ param model the “implicit” model created by Spring MVC

@ RequestMapping(“/accountSummary”)
public void accountSummary(Model model) {
model.addAttribute(“accounts”, accountManager.getAllAccounts());
}
}

index.html:

< a href=”accounts/accountSummary” >View Account Summary< /a >

http://localhost:8080/ss/accounts/accountSummary

Click on one of the listing entries

http://localhost:8080/ss/accounts/accountDetails?entityId=7

Again, this uses RequestParamin the nethod signature

public void accountDetails(@RequestParam(“entityId”) int id, Model model)

September 15, 2012 - Posted by | IoC, Web Design

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