Annotated controllers with Spring MVC 2.5

Controller annotati
con Spring MVC 2.5

Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

Spring MVC


The Old Style


The annotated style

@Controller
@RequestMapping({quot;/my/*.htmlquot;})
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 2009 Demo Web Application</display-name>



<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>1</load-on-startup>
</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=quot;1.0quot; encoding=quot;UTF-8quot;?>
<beans xmlns=quot;http://www.springframework.org/schema/beansquot;
xmlns:xsi=quot;http://www.w3.org/2001/XMLSchema-instancequot;
xmlns:context=quot;http://www.springframework.org/schema/contextquot;
xmlns:p=quot;http://www.springframework.org/schema/pquot;
xsi:schemaLocation=quot;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.xsdquot;>

<context:component-scan base-package=quot;it.jugpadova.javaday.controllerquot;/>



<bean id=quot;viewResolverquot;
class=quot;org.springframework.web.servlet.view.InternalResourceViewResolverquot;
p:prefix=quot;/WEB-INF/jsp/quot;
p:suffix=quot;.jspquot; />
</beans>

Parancoe meta-framework

www.parancoe.org
Spring MVC + Hibernate/JPA + easy DAO + ...plugins


Using the model

@Controller
@RequestMapping(quot;/contact/*.htmlquot;)
public class ContactController {

@Resource
private ContactDao contactDao;

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

}


WEB-INF/jsp/contact/list.jsp

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


More in the model

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

// producing and returning the list

}


Getting parameters

@RequestMapping
public String delete(@RequestParam(quot;idquot;) Long id) {

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

return quot;redirect:list.htmlquot;;
}


Preparing for a form

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

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

}


WEB-INF/jsp/contact/edit.jsp

<form:form commandName=quot;contactquot; method=quot;POSTquot;
action=quot;${cp}/contact/save.htmlquot;>
<table>
<tr>
<td>Name:</td>
<td><form:input path=quot;namequot;/></td>
</tr>
<tr>
<td>E-mail:</td>
<td><form:input path=quot;emailquot;/></td>
</tr>
<tr>
<td> </td>
<td><input type=quot;submitquot; value=quot;Submitquot;/></td>
</tr>
</table>
<form:errors path=quot;*quot; cssClass=quot;errorBoxquot;/>
</form:form>


Submit the form

@Controller
@RequestMapping({quot;/contact/*.htmlquot;})
@SessionAttributes({quot;contactquot;})
public class ContactController {

// ...

@RequestMapping
public String save(
@ModelAttribute(quot;contactquot;) Contact contact,
SessionStatus status) {

contactDao.store(contact);
status.setComplete();

}
}


Validation

@Resource
private Validator validator;

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

validator.validate(contact, result);
if (result.hasErrors()) {
return quot;contact/editquot;;
}

}


Parancoe validation

@RequestMapping
@Validation(view=quot;contact/editquot;, continueOnErrors=false)
public String save(@ModelAttribute(quot;contactquot;) Contact contact,
BindingResult result, SessionStatus status) {

}


File upload

<form:form commandName=quot;contactquot; method=quot;POSTquot;
action=quot;${cp}/contact/save.htmlquot;
enctype=quot;multipart/form-dataquot;>
<table>



<tr>
<td>Picture:</td>
<td><input type=quot;filequot; name=quot;picturequot; id=quot;picturequot;/></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(quot;idquot;) 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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