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java.lang.Object org.springframework.web.servlet.ModelAndView
public class ModelAndView
Holder for both Model and View in the web MVC framework. Note that these are entirely distinct. This class merely holds both to make it possible for a controller to return both model and view in a single return value.
Represents a model and view returned by a handler, to be resolved by a DispatcherServlet. The view can take the form of a String view name which will need to be resolved by a ViewResolver object; alternatively a View object can be specified directly. The model is a Map, allowing the use of multiple objects keyed by name.
DispatcherServlet
,
ViewResolver
,
HandlerAdapter.handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object)
,
Controller.handleRequest(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
Constructor Summary | |
---|---|
ModelAndView()
Default constructor for bean-style usage: populating bean properties instead of passing in constructor arguments. |
|
ModelAndView(String viewName)
Convenient constructor when there is no model data to expose. |
|
ModelAndView(String viewName,
Map model)
Creates new ModelAndView given a view name and a model. |
|
ModelAndView(String viewName,
String modelName,
Object modelObject)
Convenient constructor to take a single model object. |
|
ModelAndView(View view)
Convenient constructor when there is no model data to expose. |
|
ModelAndView(View view,
Map model)
Creates new ModelAndView given a View object and a model. |
|
ModelAndView(View view,
String modelName,
Object modelObject)
Convenient constructor to take a single model object. |
Method Summary | |
---|---|
ModelAndView |
addAllObjects(Map modelMap)
Add all attributes contained in the provided Map to the model. |
ModelAndView |
addObject(Object attributeValue)
Add an attribute to the model using parameter name generation. |
ModelAndView |
addObject(String attributeName,
Object attributeValue)
Add an attribute to the model. |
void |
clear()
Clear the state of this ModelAndView object. |
Map |
getModel()
Return the model map. |
protected Map |
getModelInternal()
Return the model map. |
ModelMap |
getModelMap()
Return the underlying ModelMap instance (never null ). |
View |
getView()
Return the View object, or null if we are using a view name
to be resolved by the DispatcherServlet via a ViewResolver. |
String |
getViewName()
Return the view name to be resolved by the DispatcherServlet via a ViewResolver, or null if we are using a View object. |
boolean |
hasView()
Indicate whether or not this ModelAndView has a view, either
as a view name or as a direct View instance. |
boolean |
isEmpty()
Return whether this ModelAndView object is empty i.e. whether it does not hold any view and does not contain a model. |
boolean |
isReference()
Return whether we use a view reference, i.e. |
void |
setView(View view)
Set a View object for this ModelAndView. |
void |
setViewName(String viewName)
Set a view name for this ModelAndView, to be resolved by the DispatcherServlet via a ViewResolver. |
String |
toString()
Return diagnostic information about this model and view. |
boolean |
wasCleared()
Return whether this ModelAndView object is empty as a result of a call to clear()
i.e. whether it does not hold any view and does not contain a model. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
---|
public ModelAndView()
setView(View)
,
setViewName(String)
public ModelAndView(String viewName)
addObject
.
viewName
- name of the View to render, to be resolved
by the DispatcherServlet's ViewResolveraddObject(java.lang.String, java.lang.Object)
public ModelAndView(View view)
addObject
.
view
- View object to renderaddObject(java.lang.String, java.lang.Object)
public ModelAndView(String viewName, Map model)
viewName
- name of the View to render, to be resolved
by the DispatcherServlet's ViewResolvermodel
- Map of model names (Strings) to model objects
(Objects). Model entries may not be null
, but the
model Map may be null
if there is no model data.public ModelAndView(View view, Map model)
view
- View object to rendermodel
- Map of model names (Strings) to model objects
(Objects). Model entries may not be null
, but the
model Map may be null
if there is no model data.public ModelAndView(String viewName, String modelName, Object modelObject)
viewName
- name of the View to render, to be resolved
by the DispatcherServlet's ViewResolvermodelName
- name of the single entry in the modelmodelObject
- the single model objectpublic ModelAndView(View view, String modelName, Object modelObject)
view
- View object to rendermodelName
- name of the single entry in the modelmodelObject
- the single model objectMethod Detail |
---|
public void setViewName(String viewName)
public String getViewName()
null
if we are using a View object.
public void setView(View view)
public View getView()
null
if we are using a view name
to be resolved by the DispatcherServlet via a ViewResolver.
public boolean hasView()
ModelAndView
has a view, either
as a view name or as a direct View
instance.
public boolean isReference()
true
if the view has been specified via a name to be resolved by the
DispatcherServlet via a ViewResolver.
protected Map getModelInternal()
null
.
Called by DispatcherServlet for evaluation of the model.
public ModelMap getModelMap()
ModelMap
instance (never null
).
public Map getModel()
null
.
To be called by application code for modifying the model.
public ModelAndView addObject(String attributeName, Object attributeValue)
attributeName
- name of the object to add to the modelattributeValue
- object to add to the model (never null
)ModelMap.addAttribute(String, Object)
,
getModelMap()
public ModelAndView addObject(Object attributeValue)
attributeValue
- the object to add to the model (never null
)ModelMap.addAttribute(Object)
,
getModelMap()
public ModelAndView addAllObjects(Map modelMap)
modelMap
- a Map of attributeName -> attributeValue pairsModelMap.addAllAttributes(Map)
,
getModelMap()
public void clear()
Can be used to suppress rendering of a given ModelAndView object
in the postHandle
method of a HandlerInterceptor.
isEmpty()
,
HandlerInterceptor.postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
public boolean isEmpty()
public boolean wasCleared()
clear()
i.e. whether it does not hold any view and does not contain a model.
Returns false
if any additional state was added to the instance
after the call to clear()
.
clear()
public String toString()
toString
in class Object
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