org.springframework.web.bind.support
Class WebRequestDataBinder

java.lang.Object
  extended by org.springframework.validation.DataBinder
      extended by org.springframework.web.bind.WebDataBinder
          extended by org.springframework.web.bind.support.WebRequestDataBinder
All Implemented Interfaces:
PropertyEditorRegistry, TypeConverter

public class WebRequestDataBinder
extends WebDataBinder

Special DataBinder to perform data binding from web request parameters to JavaBeans, including support for multipart files.

See the DataBinder/WebDataBinder superclasses for customization options, which include specifying allowed/required fields, and registering custom property editors.

Can also used for manual data binding in custom web controllers or interceptors that build on Spring's WebRequest abstraction: e.g. in a WebRequestInterceptor implementation. Simply instantiate a WebRequestDataBinder for each binding process, and invoke bind with the current WebRequest as argument:

 MyBean myBean = new MyBean();
 // apply binder to custom target object
 WebRequestDataBinder binder = new WebRequestDataBinder(myBean);
 // register custom editors, if desired
 binder.registerCustomEditor(...);
 // trigger actual binding of request parameters
 binder.bind(request);
 // optionally evaluate binding errors
 Errors errors = binder.getErrors();
 ...

Since:
2.5.2
Author:
Juergen Hoeller
See Also:
bind(org.springframework.web.context.request.WebRequest), DataBinder.registerCustomEditor(java.lang.Class, , java.beans.PropertyEditor), DataBinder.setAllowedFields(java.lang.String...), DataBinder.setRequiredFields(java.lang.String...), WebDataBinder.setFieldMarkerPrefix(java.lang.String)

Field Summary
 
Fields inherited from class org.springframework.web.bind.WebDataBinder
DEFAULT_FIELD_DEFAULT_PREFIX, DEFAULT_FIELD_MARKER_PREFIX
 
Fields inherited from class org.springframework.validation.DataBinder
DEFAULT_AUTO_GROW_COLLECTION_LIMIT, DEFAULT_OBJECT_NAME, logger
 
Constructor Summary
WebRequestDataBinder(Object target)
          Create a new WebRequestDataBinder instance, with default object name.
WebRequestDataBinder(Object target, String objectName)
          Create a new WebRequestDataBinder instance.
 
Method Summary
 void bind(WebRequest request)
          Bind the parameters of the given request to this binder's target, also binding multipart files in case of a multipart request.
 void closeNoCatch()
          Treats errors as fatal.
 
Methods inherited from class org.springframework.web.bind.WebDataBinder
bindMultipart, bindMultipartFiles, checkFieldDefaults, checkFieldMarkers, doBind, getEmptyValue, getFieldDefaultPrefix, getFieldMarkerPrefix, isBindEmptyMultipartFiles, setBindEmptyMultipartFiles, setFieldDefaultPrefix, setFieldMarkerPrefix
 
Methods inherited from class org.springframework.validation.DataBinder
applyPropertyValues, bind, checkAllowedFields, checkRequiredFields, close, convertIfNecessary, convertIfNecessary, findCustomEditor, getAllowedFields, getAutoGrowCollectionLimit, getBindingErrorProcessor, getBindingResult, getConversionService, getDisallowedFields, getErrors, getInternalBindingResult, getObjectName, getPropertyAccessor, getPropertyEditorRegistry, getRequiredFields, getSimpleTypeConverter, getTarget, getTypeConverter, getValidator, initBeanPropertyAccess, initDirectFieldAccess, isAllowed, isAutoGrowNestedPaths, isIgnoreInvalidFields, isIgnoreUnknownFields, registerCustomEditor, registerCustomEditor, setAllowedFields, setAutoGrowCollectionLimit, setAutoGrowNestedPaths, setBindingErrorProcessor, setConversionService, setDisallowedFields, setExtractOldValueForEditor, setIgnoreInvalidFields, setIgnoreUnknownFields, setMessageCodesResolver, setRequiredFields, setValidator, validate, validate
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

WebRequestDataBinder

public WebRequestDataBinder(Object target)
Create a new WebRequestDataBinder instance, with default object name.

Parameters:
target - the target object to bind onto (or null if the binder is just used to convert a plain parameter value)
See Also:
DataBinder.DEFAULT_OBJECT_NAME

WebRequestDataBinder

public WebRequestDataBinder(Object target,
                            String objectName)
Create a new WebRequestDataBinder instance.

Parameters:
target - the target object to bind onto (or null if the binder is just used to convert a plain parameter value)
objectName - the name of the target object
Method Detail

bind

public void bind(WebRequest request)
Bind the parameters of the given request to this binder's target, also binding multipart files in case of a multipart request.

This call can create field errors, representing basic binding errors like a required field (code "required"), or type mismatch between value and bean property (code "typeMismatch").

Multipart files are bound via their parameter name, just like normal HTTP parameters: i.e. "uploadedFile" to an "uploadedFile" bean property, invoking a "setUploadedFile" setter method.

The type of the target property for a multipart file can be MultipartFile, byte[], or String. The latter two receive the contents of the uploaded file; all metadata like original file name, content type, etc are lost in those cases.

Parameters:
request - request with parameters to bind (can be multipart)
See Also:
MultipartRequest, MultipartFile, WebDataBinder.bindMultipartFiles(java.util.Map, org.springframework.beans.MutablePropertyValues), DataBinder.bind(org.springframework.beans.PropertyValues)

closeNoCatch

public void closeNoCatch()
                  throws BindException
Treats errors as fatal.

Use this method only if it's an error if the input isn't valid. This might be appropriate if all input is from dropdowns, for example.

Throws:
BindException - if binding errors have been encountered