With SpringMVC you can create generic based controllers ...
you will need, though, to extend your persistent objects from a common base
class holding the id and a 'isNew' convenience method
this can reduce to almost zero the amount of java code to create
master/detail pages (which use to be a large part of most applications ;-)
Now if springmvc had something like webwork template based tags it could be
the killing web framework :D
Hope it helps
Regards
Ivan
---------------- PersistentObject.java --------------------------------
@MappedSuperclass
public abstract class PersistentObject extends BaseObject {
protected Long id;
protected Integer version;
@Id @GeneratedValue(strategy=GenerationType.AUTO)
public Long getId() {
return id;
}
@Version
public Integer getVersion() {
return version;
}
public void setId(Long id) {
this.id = id;
}
public void setVersion(Integer version) {
this.version = version;
}
@Transient
public boolean isNew() {
return getId() == null;
}
}
----------------------------------------------------------------------
-------------- GenericFormController.java ----------------------
import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.appfuse.service.GenericManager;
import org.appfuse.tutorial.model.PersistentObject;
import org.appfuse.webapp.controller.BaseFormController;
import org.springframework.validation.BindException;
import org.springframework.web.servlet.ModelAndView;
/**
* GenericFormController
*
* <p>
* GenericFormController.java.html View Source
* </p>
*
* @author Ivan Garcia Sainz-Aja
*
*/
public class GenericFormController<T extends PersistentObject> extends
BaseFormController {
private GenericManager<T,Long> manager = null;
/**
* Setter for the field manager
* @param manager The manager to set.
*/
public void setManager(GenericManager<T,Long> manager) {
this.manager = manager;
}
/**
* Persists given perstistentObject using configured GenericManager.
* @param persistentObject
* @throws Exception
*/
protected void doSave(PersistentObject persistentObject) throws
Exception {
manager.save((T)persistentObject);
}
/**
* Removes the given persistentObject using configured GenericManager.
* @param persistentObject
* @throws Exception
*/
protected void doDelete(PersistentObject persistentObject) throws
Exception {
manager.remove(persistentObject.getId());
}
/**
* @see
org.springframework.web.servlet.mvc.SimpleFormController#onSubmit(javax.servlet.http.HttpServletRequest,
javax.servlet.http.HttpServletResponse, java.lang.Object,
org.springframework.validation.BindException)
*/
@Override
protected ModelAndView onSubmit(HttpServletRequest request,
HttpServletResponse response, Object command, BindException errors) throws
Exception {
log.debug("entering 'onSubmit' method...");
PersistentObject persistentObject = (PersistentObject) command;
boolean isNew = persistentObject.isNew();
String success = getSuccessView();
Locale locale = request.getLocale();
if (request.getParameter("delete") != null) {
doDelete(persistentObject);
success = getViewAfterDelete();
saveMessage(request, getText(getCommandName() + ".deleted",
locale));
}
else{
doSave(persistentObject);
success = (isNew? getViewAfterInsert(): getViewAfterUpdate());
String key = getCommandName() + ( (isNew) ? ".added" : ".updated");
saveMessage(request, getText(key, locale));
}
return new ModelAndView(success, "id" , persistentObject.getId());
}
/**
* @see
org.springframework.web.servlet.mvc.AbstractFormController#formBackingObject(javax.servlet.http.HttpServletRequest)
*/
@Override
protected Object formBackingObject(HttpServletRequest request) throws
Exception {
String id = request.getParameter("id");
if (!StringUtils.isEmpty(id) && StringUtils.isNumeric(id)) {
return manager.get(new Long(id));
}
return createCommand();
}
//Configurable success views ...
private String viewAfterInsert;
private String viewAfterUpdate;
private String viewAfterDelete;
/**
* Returns the name of the view that should be shown on successful
delete.
* Defaults to successView in case it is null.
* @return the viewAfterDelete
*/
public String getViewAfterDelete() {
return (viewAfterDelete != null ? viewAfterDelete :
getSuccessView()) ;
}
/**
* Returns the name of the view that should be shown on successful
insert.
* Defaults to successView in case it is null.
* @return the viewAfterInsert
*/
public String getViewAfterInsert() {
return (viewAfterInsert != null ? viewAfterInsert :
getSuccessView()) ;
}
/**
* Returns the name of the view that should be shown on successful
update.
* Defaults to successView in case it is null.
* @return the viewAfterUpdate
*/
public String getViewAfterUpdate() {
return (viewAfterUpdate != null ? viewAfterUpdate :
getSuccessView()) ;
}
/**
* @param viewAfterDelete the viewAfterDelete to set
*/
public void setViewAfterDelete(String viewAfterDelete) {
this.viewAfterDelete = viewAfterDelete;
}
/**
* @param viewAfterInsert the viewAfterInsert to set
*/
public void setViewAfterInsert(String viewAfterInsert) {
this.viewAfterInsert = viewAfterInsert;
}
/**
* @param viewAfterUpdate the viewAfterUpdate to set
*/
public void setViewAfterUpdate(String viewAfterUpdate) {
this.viewAfterUpdate = viewAfterUpdate;
}
}
--------------------------------------------------------------------------
--------------- dispatcher-servlet.xml -------------------------------
<bean id="personFormController"
class="org.appfuse.tutorial.webapp.controller.GenericFormController">
<property name="commandName" value="person"/>
<property name="commandClass" value="org.appfuse.tutorial.model.Person"
/>
<property name="validator" ref="beanValidator"/>
<property name="formView" value="personForm"/>
<property name="successView" value="redirect:persons.html"/>
<property name="cancelView" value="redirect:mainMenu.html"/>
<property name="manager" ref="personManager"/>
</bean>
-------------------------------------------------------------------------
obviously in real life you may need to override some methods (referenceData,
onBind ...) but you already have the bulk of the job done ;-)
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