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ModelAndView
ModelAndView is a class present in org.springframework.web.servlet package. ModelAndView is a value object designed to hold model and view making it possible for a handler to return both model and view in a single return value. ModelAndView is resolved by DispatcherServlet using special framework objects ViewResolver and View.
View
It is a String which is the name of a JSP file or which is the value given for the name attribute of a <bean> tag where this <bean> tag corresponds to the class which implements View interface.
Model
It is an object which stores the values that need to be sent to views/JSP. It can be a String object which has stored a string value. When we have to send many model values, we can store them in Map and object of Map can be used.
Constructors of ModelAndView class
Constructor | 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, HttpStatus status) | Create a new ModelAndView given a view name and HTTP status. |
ModelAndView(String viewName, Map< String,?> model) | Create a new ModelAndView given a view name and a model. |
ModelAndView(String viewName, Map<String,?> model, HttpStatus status) | Create a new ModelAndView given a view name, model, and HTTP status. |
ModelAndView(String viewName, String modelName, Object modelObject) | Convenient constructor to take a single model object. |
ModelAndView(View view, 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) | Create a new ModelAndView given a View object and a model. |
Important methods of ModelAndView class
Method | Description |
public boolean hasView() | Indicate whether or not this ModelAndView has a view, either as a view name or as a direct View instance. |
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. |
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. |
public Map getModel() | Return the model map. Never returns null. To be called by application code for modifying the model. |
public ModelAndView addAllObjects( Map< String,?> modelMap) | Add all attributes contained in the provided Map to the model. |
public ModelAndView addObject(String attributeName, Object attributeValue) | Add an attribute to the model. |
public ModelMap getModelMap() | Return the underlying ModelMap instance (never null). |
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. |
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. |
public void setView(View view) | Set a View object for this ModelAndView. Will override any pre-existing view name or View. |
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. |
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