| org.springframework.web.servlet.mvc.AbstractController
 org.springframework.web.servlet.mvc.BaseCommandController
All known Subclasses: org.springframework.web.servlet.mvc.AbstractFormController, org.springframework.web.servlet.mvc.AbstractCommandController,
| BaseCommandController | | abstract public class BaseCommandController extends AbstractController (Code) | | Controller implementation which creates an object (the command object) on
receipt of a request and attempts to populate this object with request parameters.
This controller is the base for all controllers wishing to populate
JavaBeans based on request parameters, validate the content of such
JavaBeans using
org.springframework.validation.Validator Validators and use custom editors (in the form of
java.beans.PropertyEditor PropertyEditors ) to transform
objects into strings and vice versa, for example. Three notions are mentioned here:
Command class:
An instance of the command class will be created for each request and populated
with request parameters. A command class can basically be any Java class; the only
requirement is a no-arg constructor. The command class should preferably be a
JavaBean in order to be able to populate bean properties with request parameters.
Populating using request parameters and PropertyEditors:
Upon receiving a request, any BaseCommandController will attempt to fill the
command object using the request parameters. This is done using the typical
and well-known JavaBeans property notation. When a request parameter named
'firstName' exists, the framework will attempt to call
setFirstName([value]) passing the value of the parameter. Nested properties
are of course supported. For instance a parameter named 'address.city'
will result in a getAddress().setCity([value]) call on the
command class.
It's important to realise that you are not limited to String arguments in
your JavaBeans. Using the PropertyEditor-notion as supplied by the
java.beans package, you will be able to transform Strings to Objects and
the other way around. For instance setLocale(Locale loc) is
perfectly possible for a request parameter named locale having
a value of en, as long as you register the appropriate
PropertyEditor in the Controller (see
BaseCommandController.initBinder initBinder() for more information on that matter.
Validators:
After the controller has successfully populated the command object with
parameters from the request, it will use any configured validators to
validate the object. Validation results will be put in a
org.springframework.validation.Errors Errors object which can be
used in a View to render any input problems.
Workflow
(and that defined by superclass):
Since this class is an abstract base class for more specific implementation,
it does not override the handleRequestInternal() method and also has no
actual workflow. Implementing classes like
AbstractFormController AbstractFormController ,
AbstractCommandController AbstractcommandController ,
SimpleFormController SimpleFormController and
AbstractWizardFormController AbstractWizardFormController provide actual functionality and workflow.
More information on workflow performed by superclasses can be found
here.
Exposed configuration properties
(and those defined by superclass):
| name
| default |
description |
| commandName |
command |
the name to use when binding the instantiated command class
to the request |
| commandClass |
null |
the class to use upon receiving a request and which to fill
using the request parameters. What object is used and whether
or not it should be created is defined by extending classes
and their configuration properties and methods. |
| validators |
null |
Array of Validator beans. The validator will be called at appropriate
places in the workflow of subclasses (have a look at those for more info)
to validate the command object. |
| validator |
null |
Short-form property for setting only one Validator bean (usually passed in
using a <ref bean="beanId"/> property. |
| validateOnBinding |
true |
Indicates whether or not to validate the command object after the
object has been populated with request parameters. |
author:
Rod Johnson
author:
Juergen Hoeller |
| Method Summary | |
| final protected ServletRequestDataBinder | bindAndValidate(HttpServletRequest request, Object command)
Bind the parameters of the given request to the given command object. | | final protected boolean | checkCommand(Object command)
Check if the given command object is a valid for this controller,
i.e. | | protected ServletRequestDataBinder | createBinder(HttpServletRequest request, Object command)
Create a new binder instance for the given command and request.
Called by
BaseCommandController.bindAndValidate . | | final protected Object | createCommand()
Create a new command instance for the command class of this controller. | | final public BindingErrorProcessor | getBindingErrorProcessor()
Return the strategy to use for processing binding errors. | | protected Object | getCommand(HttpServletRequest request)
Retrieve a command object for the given request. | | final public Class | getCommandClass()
Return the command class for this controller. | | final public String | getCommandName()
Return the name of the command in the model. | | final public MessageCodesResolver | getMessageCodesResolver()
Return the strategy to use for resolving errors into message codes. | | final public PropertyEditorRegistrar[] | getPropertyEditorRegistrars()
Return the PropertyEditorRegistrars to be applied
to every DataBinder that this controller uses. | | final public Validator | getValidator()
Return the primary Validator for this controller. | | final public Validator[] | getValidators()
Return the Validators for this controller. | | protected void | initApplicationContext()
| | protected void | initBinder(HttpServletRequest request, ServletRequestDataBinder binder)
Initialize the given binder instance, for example with custom editors.
Called by
BaseCommandController.createBinder .
This method allows you to register custom editors for certain fields of your
command class. | | final public boolean | isValidateOnBinding()
Return if the Validator should get applied when binding. | | protected void | onBind(HttpServletRequest request, Object command, BindException errors)
Callback for custom post-processing in terms of binding. | | protected void | onBind(HttpServletRequest request, Object command)
Callback for custom post-processing in terms of binding. | | protected void | onBindAndValidate(HttpServletRequest request, Object command, BindException errors)
Callback for custom post-processing in terms of binding and validation. | | final protected void | prepareBinder(ServletRequestDataBinder binder)
Prepare the given binder, applying the specified MessageCodesResolver,
BindingErrorProcessor and PropertyEditorRegistrars (if any). | | final public void | setBindingErrorProcessor(BindingErrorProcessor bindingErrorProcessor)
Set the strategy to use for processing binding errors, that is,
required field errors and PropertyAccessExceptions. | | final public void | setCommandClass(Class commandClass)
Set the command class for this controller. | | final public void | setCommandName(String commandName)
Set the name of the command in the model. | | final public void | setMessageCodesResolver(MessageCodesResolver messageCodesResolver)
Set the strategy to use for resolving errors into message codes.
Applies the given strategy to all data binders used by this controller.
Default is null, i.e. | | final public void | setPropertyEditorRegistrar(PropertyEditorRegistrar propertyEditorRegistrar)
Specify a single PropertyEditorRegistrar to be applied
to every DataBinder that this controller uses. | | final public void | setPropertyEditorRegistrars(PropertyEditorRegistrar[] propertyEditorRegistrars)
Specify multiple PropertyEditorRegistrars to be applied
to every DataBinder that this controller uses. | | final public void | setValidateOnBinding(boolean validateOnBinding)
Set if the Validator should get applied when binding. | | final public void | setValidator(Validator validator)
Set the primary Validator for this controller. | | final public void | setValidators(Validator[] validators)
Set the Validators for this controller. | | protected boolean | suppressBinding(HttpServletRequest request)
Return whether to suppress binding for the given request.
The default implementation always returns "false". | | protected boolean | suppressValidation(HttpServletRequest request, Object command, BindException errors)
Return whether to suppress validation for the given request. | | protected boolean | suppressValidation(HttpServletRequest request, Object command)
Return whether to suppress validation for the given request. | | protected boolean | suppressValidation(HttpServletRequest request)
Return whether to suppress validation for the given request. | | protected boolean | useDirectFieldAccess()
Determine whether to use direct field access instead of bean property access.
Applied by
BaseCommandController.prepareBinder .
Default is "false". |
| DEFAULT_COMMAND_NAME | | final public static String DEFAULT_COMMAND_NAME(Code) | | Default command name used for binding command objects: "command"
|
| bindAndValidate | | final protected ServletRequestDataBinder bindAndValidate(HttpServletRequest request, Object command) throws Exception(Code) | | Bind the parameters of the given request to the given command object.
Parameters:
request - current HTTP request
Parameters:
command - the command to bind onto the ServletRequestDataBinder instance for additional custom validation
throws:
Exception - in case of invalid state or arguments |
| checkCommand | | final protected boolean checkCommand(Object command)(Code) | | Check if the given command object is a valid for this controller,
i.e. its command class.
Parameters:
command - the command object to check if the command object is valid for this controller |
| createCommand | | final protected Object createCommand() throws Exception(Code) | | Create a new command instance for the command class of this controller.
This implementation uses BeanUtils.instantiateClass,
so the command needs to have a no-arg constructor (supposed to be
public, but not required to).
the new command instance
throws:
Exception - if the command object could not be instantiated
See Also: org.springframework.beans.BeanUtils.instantiateClass(Class) |
| getBindingErrorProcessor | | final public BindingErrorProcessor getBindingErrorProcessor()(Code) | | Return the strategy to use for processing binding errors.
|
| getCommandClass | | final public Class getCommandClass()(Code) | | Return the command class for this controller.
|
| getCommandName | | final public String getCommandName()(Code) | | Return the name of the command in the model.
|
| getMessageCodesResolver | | final public MessageCodesResolver getMessageCodesResolver()(Code) | | Return the strategy to use for resolving errors into message codes.
|
| getPropertyEditorRegistrars | | final public PropertyEditorRegistrar[] getPropertyEditorRegistrars()(Code) | | Return the PropertyEditorRegistrars to be applied
to every DataBinder that this controller uses.
|
| getValidator | | final public Validator getValidator()(Code) | | Return the primary Validator for this controller.
|
| getValidators | | final public Validator[] getValidators()(Code) | | Return the Validators for this controller.
|
| initApplicationContext | | protected void initApplicationContext()(Code) | | |
| isValidateOnBinding | | final public boolean isValidateOnBinding()(Code) | | Return if the Validator should get applied when binding.
|
| onBindAndValidate | | protected void onBindAndValidate(HttpServletRequest request, Object command, BindException errors) throws Exception(Code) | | Callback for custom post-processing in terms of binding and validation.
Called on each submit, after standard binding and validation,
but before error evaluation.
The default implementation is empty.
Parameters:
request - current HTTP request
Parameters:
command - the command object, still allowing for further binding
Parameters:
errors - validation errors holder, allowing for additionalcustom validation
throws:
Exception - in case of invalid state or arguments
See Also: BaseCommandController.bindAndValidate
See Also: org.springframework.validation.Errors |
| setCommandClass | | final public void setCommandClass(Class commandClass)(Code) | | Set the command class for this controller.
An instance of this class gets populated and validated on each request.
|
| setCommandName | | final public void setCommandName(String commandName)(Code) | | Set the name of the command in the model.
The command object will be included in the model under this name.
|
| setValidateOnBinding | | final public void setValidateOnBinding(boolean validateOnBinding)(Code) | | Set if the Validator should get applied when binding.
|
| setValidator | | final public void setValidator(Validator validator)(Code) | | Set the primary Validator for this controller. The Validator
must support the specified command class. If there are one
or more existing validators set already when this method is
called, only the specified validator will be kept. Use
BaseCommandController.setValidators(Validator[]) to set multiple validators.
|
| setValidators | | final public void setValidators(Validator[] validators)(Code) | | Set the Validators for this controller.
The Validator must support the specified command class.
|
| suppressBinding | | protected boolean suppressBinding(HttpServletRequest request)(Code) | | Return whether to suppress binding for the given request.
The default implementation always returns "false". Can be overridden
in subclasses to suppress validation, for example, if a special
request parameter is set.
Parameters:
request - current HTTP request whether to suppress binding for the given request
See Also: BaseCommandController.suppressValidation |
| suppressValidation | | protected boolean suppressValidation(HttpServletRequest request, Object command, BindException errors)(Code) | | Return whether to suppress validation for the given request.
The default implementation delegates to
BaseCommandController.suppressValidation(HttpServletRequest,Object) .
Parameters:
request - current HTTP request
Parameters:
command - the command object to validate
Parameters:
errors - validation errors holder, allowing for additionalcustom registration of binding errors whether to suppress validation for the given request |
|
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