ModelAndView (Spring Framework 4.0.9.RELEASE API)

java.lang.Object
- org.springframework.web.servlet.ModelAndView

```
public class ModelAndView
extends Object
```
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.

Author:

Rod Johnson, Juergen Hoeller, Rob Harrop

See Also:

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

Constructors
Constructor and Description
`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<String,?> 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<String,?> 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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`ModelAndView`	`addAllObjects(Map<String,?> 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<String,Object>`	`getModel()` Return the model map.
`protected Map<String,Object>`	`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.
`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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - ModelAndView
```
public ModelAndView()
```
    Default constructor for bean-style usage: populating bean properties instead of passing in constructor arguments.
    
    See Also:
    
    setView(View), setViewName(String)
  - ModelAndView
```
public ModelAndView(String viewName)
```
    Convenient constructor when there is no model data to expose. Can also be used in conjunction with addObject.
    
    Parameters:
    
    viewName - name of the View to render, to be resolved by the DispatcherServlet's ViewResolver
    
    See Also:
    
    addObject(java.lang.String, java.lang.Object)
  - ModelAndView
```
public ModelAndView(View view)
```
    Convenient constructor when there is no model data to expose. Can also be used in conjunction with addObject.
    
    Parameters:
    
    view - View object to render
    
    See Also:
    
    addObject(java.lang.String, java.lang.Object)
  - ModelAndView
```
public ModelAndView(String viewName,
                    Map<String,?> model)
```
    Creates new ModelAndView given a view name and a model.
    
    Parameters:
    
    viewName - name of the View to render, to be resolved by the DispatcherServlet's ViewResolver
    
    model - 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.
  - ModelAndView
```
public ModelAndView(View view,
                    Map<String,?> model)
```
    Creates new ModelAndView given a View object and a model. Note: the supplied model data is copied into the internal storage of this class. You should not consider to modify the supplied Map after supplying it to this class
    
    Parameters:
    
    view - View object to render
    
    model - 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.
  - ModelAndView
```
public ModelAndView(String viewName,
                    String modelName,
                    Object modelObject)
```
    Convenient constructor to take a single model object.
    
    Parameters:
    
    viewName - name of the View to render, to be resolved by the DispatcherServlet's ViewResolver
    
    modelName - name of the single entry in the model
    
    modelObject - the single model object
  - ModelAndView
```
public ModelAndView(View view,
                    String modelName,
                    Object modelObject)
```
    Convenient constructor to take a single model object.
    
    Parameters:
    
    view - View object to render
    
    modelName - name of the single entry in the model
    
    modelObject - the single model object
- Method Detail
  - setViewName
```
public void setViewName(String viewName)
```
    Set a view name for this ModelAndView, to be resolved by the DispatcherServlet via a ViewResolver. Will override any pre-existing view name or View.
  - getViewName
```
public String getViewName()
```
    Return the view name to be resolved by the DispatcherServlet via a ViewResolver, or null if we are using a View object.
  - setView
```
public void setView(View view)
```
    Set a View object for this ModelAndView. Will override any pre-existing view name or View.
  - getView
```
public View getView()
```
    Return the View object, or null if we are using a view name to be resolved by the DispatcherServlet via a ViewResolver.
  - hasView
```
public boolean hasView()
```
    Indicate whether or not this ModelAndView has a view, either as a view name or as a direct View instance.
  - isReference
```
public boolean isReference()
```
    Return whether we use a view reference, i.e. true if the view has been specified via a name to be resolved by the DispatcherServlet via a ViewResolver.
  - getModelInternal
```
protected Map<String,Object> getModelInternal()
```
    Return the model map. May return null. Called by DispatcherServlet for evaluation of the model.
  - getModelMap
```
public ModelMap getModelMap()
```
    Return the underlying ModelMap instance (never null).
  - getModel
```
public Map<String,Object> getModel()
```
    Return the model map. Never returns null. To be called by application code for modifying the model.
  - addObject
```
public ModelAndView addObject(String attributeName,
                              Object attributeValue)
```
    Add an attribute to the model.
    
    Parameters:
    
    attributeName - name of the object to add to the model
    
    attributeValue - object to add to the model (never null)
    
    See Also:
    
    ModelMap.addAttribute(String, Object), getModelMap()
  - addObject
```
public ModelAndView addObject(Object attributeValue)
```
    Add an attribute to the model using parameter name generation.
    
    Parameters:
    
    attributeValue - the object to add to the model (never null)
    
    See Also:
    
    ModelMap.addAttribute(Object), getModelMap()
  - addAllObjects
```
public ModelAndView addAllObjects(Map<String,?> modelMap)
```
    Add all attributes contained in the provided Map to the model.
    
    Parameters:
    
    modelMap - a Map of attributeName -> attributeValue pairs
    
    See Also:
    
    ModelMap.addAllAttributes(Map), getModelMap()
  - clear
```
public void clear()
```
    Clear the state of this ModelAndView object. The object will be empty afterwards.
    Can be used to suppress rendering of a given ModelAndView object in the postHandle method of a HandlerInterceptor.
    
    See Also:
    
    isEmpty(), HandlerInterceptor.postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
  - isEmpty
```
public boolean isEmpty()
```
    Return whether this ModelAndView object is empty, i.e. whether it does not hold any view and does not contain a model.
  - wasCleared
```
public 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.
    Returns false if any additional state was added to the instance after the call to clear().
    
    See Also:
    
    clear()
  - toString
```
public String toString()
```
    Return diagnostic information about this model and view.
    
    Overrides:
    
    toString in class Object

Class ModelAndView

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ModelAndView

ModelAndView

ModelAndView

ModelAndView

ModelAndView

ModelAndView

ModelAndView

Method Detail

setViewName

getViewName

setView

getView

hasView

isReference

getModelInternal

getModelMap

getModel

addObject

addObject

addAllObjects

clear

isEmpty

wasCleared

toString