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## org.springframework.web.servlet
Class ModelAndView

    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
`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

### 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 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 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 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 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 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`

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