annotated controllers with spring mvc 2.5

Lucio Benfante - [email protected] – JUG PadovaJavaday Roma III Edizione – 24 gennaio 2009

Controller annotaticon Spring MVC 2.5


Spring MVC


The Old Style


The annotated style

Controller@RequestMapping( "/my/ .html" )@ { * }

public class MyController {

RequestMapping@ public void index() {

// do something useful }

}


Configuration

No, thanks!(at least while I’m writing the code)


WEB-INF/web.xml

web-app< > display-name JavaDay 2 9 Demo Web Application /display-name< > 00 < >

!--< context-param< > param-name contextConfigLocation /param-name< > < > param-value< >/WEB-INF/applicationContext.xml /param-value< > /context-param< > -->

listener< > listener-class< >org.springframework.web.context.ContextLoaderListener /listener-class< > /listener< >

servlet< > servlet-name< >javaday /servlet-name< > servlet-class< >org.springframework.web.servlet.DispatcherServlet /servlet-class< > load-on-startup /load-on-startup< >1< > /servlet< >

servlet-mapping< > servlet-name javaday /servlet-name< > < > url-pattern .html /url-pattern< >* < > /servlet-mapping< >

welcome-file-list< > welcome-file redirect.jsp /welcome-file< > < > /welcome-file-list< >/web-app< >


WEB-INF/javaday-servlet.xml

?xml version=" . " encoding="UTF-8"?< 1 0 >beans xmlns="http://www.springframework.org/schema/beans"<

xmlns:xsi="http://www.w3.org/2 /XMLSchema-instance"001 xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" 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 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

context:component-scan base-package="< it.jugpadova.javaday.controller"/>

!--<bean<

class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">property name="webBindingInitializer"< >

bean class="it.jugpadova.javaday.JavadayBindingInitializer"/< >/property< >

/bean< > -->

bean id="viewResolver"< class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />/beans< >

http://www.springframework.org/schema/beans


Parancoe meta-framework

www.parancoe.org

Spring MVC + Hibernate/JPA + easy DAO + ...plugins


Using the model

Controller@RequestMapping("/contact/ .html")@ *

public class ContactController {

Resource@ private ContactDao contactDao;

RequestMapping@ public void list(Model model) { List Contact contacts = contactDao.findAll();< > model.addAttribute("contacts", contacts); }

}


WEB-INF/jsp/contact/list.jsp

table< > c:forEach var="contact" items="< contacts${ }"> tr< > td contact.name /td< >${ }< > td contact.email /td< >${ }< > td< > a href="edit.html?id= contact.id " Edit /a< ${ } > < > a href="delete.html?id= contact.id " Delete /a< ${ } > < > /td< > /tr< > /c:forEach< >/table< >c:if test="< empty contacts${ }" No contacts in the DB /c:if> < >a href="edit.html" New /a< > < >


More in the model

ModelAttribute(“countries”)@public List Country getCountries() < > {

// producing and returning the list

}


Getting parameters

RequestMapping@public String delete( RequestParam("id") @ Long id) {

Contact contact = contactDao.get(id); if (contact == null) { throw new RuntimeException("Contact not found"); } contactDao.delete(contact);

return "redirect:list.html";}


Preparing for a form

RequestMapping@public void edit( RequestParam(value = "id", @ required = false) Long id, Model model) {

Contact contact = null; if (id != null) { contact = contactDao.get(id); if (contact == null) { throw new RuntimeException("Contact not found"); } else } { contact = new Contact(); } model.addAttribute("contact", contact);

}


WEB-INF/jsp/contact/edit.jsp

form:form commandName="< contact" method="POST" action=" cp /contact/save.html"${ } > table< > tr< > td Name: /td< > < > td< > form:input path="name"/< > /td< > /tr< > tr< > td E-mail: /td< > < > td< > form:input path="email"/< > /td< > /tr< > tr< > td /td< > < > td input type="submit" value="Submit"/ /td< >< >< > /tr< > /table< > form:errors path=" " cssClass="errorBox"/< * >/form:form< >


Submit the form

Controller@RequestMapping( "/contact/ .html" )@ { * }SessionAttributes( "contact" )@ { }

public class ContactController {

// ... RequestMapping@ public String save( ModelAttribute("contact") Contact contact@ , SessionStatus status) {

contactDao.store(contact); status.setComplete(); return "redirect:list.html";

}}


Validation

Resource@private Validator validator;

RequestMapping@public String save( ModelAttribute("contact") Contact contact,@ BindingResult result, SessionStatus status) {

validator.validate(contact, result); if (result.hasErrors()) { return "contact/edit"; }

contactDao.store(contact); status.setComplete(); return "redirect:list.html";}


Parancoe validation

RequestMapping@Validation(view="contact/edit", continueOnErrors=false)@

public String save( ModelAttribute("contact") Contact contact,@ BindingResult result, SessionStatus status) {

contactDao.store(contact); status.setComplete(); return "redirect:list.html";}


File upload

form:form commandName="contact" method="POST"< action=" cp /contact/save.html"${ } enctype="multipart/form-data"> table< >

!-- ... --< >

tr< > td Picture: /td< > < > td< > input type="file" name="picture" id="picture"/< > /td< > /tr< >

!-- ... --< >

/form:form< >


Changing the binding

InitBinder@protected void initBinder(WebDataBinder binder) {

binder.registerCustomEditor(byte .class,[] new ByteArrayMultipartFileEditor());

}


Binary output

RequestMapping@public void picture( RequestParam("id") Long id, @ OutputStream os) throws IOException {

Contact contact = contactDao.get(id);

os.write(contact.getPicture()); os.flush(); os.close();

}

img src=” cp /contact/picture.html”< ${ } >


Questions?

?

annotated controllers with spring mvc 2.5

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