Controller annotati
con Spring MVC 2.5
Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

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

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

The annotated style
@Controller
@RequestMapping({\"/my/*.html\"})
public class MyController {
@RequestMapping
public void index() {
// do something useful
}
}
Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

Configuration
No, thanks!
(at least while I’m writing the code)
Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

WEB-INF/web.xml
<web-app>
<display-name>JavaDay 2009 Demo Web Application</display-name>
<!--
<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>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>
Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

WEB-INF/javaday-servlet.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\"
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>
Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

Parancoe meta-framework
www.parancoe.org
Spring MVC + Hibernate/JPA + easy DAO + ...plugins
Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

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

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

More in the model
@ModelAttribute(“countries”)
public List<Country> getCountries() {
// producing and returning the list
}
Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

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

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

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>&nbsp;</td>
<td><input type=\"submit\" value=\"Submit\"/></td>
</tr>
</table>
<form:errors path=\"*\" cssClass=\"errorBox\"/>
</form:form>
Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

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

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

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

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

Changing the binding
@InitBinder
protected void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(byte[].class,
new ByteArrayMultipartFileEditor());
}
Lucio Benfante - lucio.benfante@jugpadova.it – JUG Padova
Javaday Roma III Edizione – 24 gennaio 2009

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

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