org.springframework.web.bind.support

Class WebRequestDataBinder

java.lang.Object

org.springframework.validation.DataBinder

org.springframework.web.bind.WebDataBinder

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, Brian Clozel

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)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	WebRequestDataBinder.Servlet3MultipartHelper Encapsulate Part binding code for Servlet 3.0+ only containers.

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

Constructors

Constructor and Description
WebRequestDataBinder(java.lang.Object target) Create a new WebRequestDataBinder instance, with default object name.
WebRequestDataBinder(java.lang.Object target, java.lang.String objectName) Create a new WebRequestDataBinder instance.

Method Summary

Modifier and Type	Method and Description
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.
private boolean	isMultipartRequest(WebRequest request) Check if the request is a multipart request (by checking its Content-Type header).

Methods inherited from class org.springframework.web.bind.WebDataBinder

bindMultipart, checkFieldDefaults, checkFieldMarkers, doBind, getEmptyValue, getFieldDefaultPrefix, getFieldMarkerPrefix, isBindEmptyMultipartFiles, setBindEmptyMultipartFiles, setFieldDefaultPrefix, setFieldMarkerPrefix

Methods inherited from class org.springframework.validation.DataBinder

addCustomFormatter, addCustomFormatter, addCustomFormatter, addValidators, applyPropertyValues, bind, checkAllowedFields, checkRequiredFields, close, convertIfNecessary, convertIfNecessary, convertIfNecessary, createBeanPropertyBindingResult, createDirectFieldBindingResult, findCustomEditor, getAllowedFields, getAutoGrowCollectionLimit, getBindingErrorProcessor, getBindingResult, getConversionService, getDisallowedFields, getInternalBindingResult, getObjectName, getPropertyAccessor, getPropertyEditorRegistry, getRequiredFields, getSimpleTypeConverter, getTarget, getTypeConverter, getValidator, getValidators, initBeanPropertyAccess, initDirectFieldAccess, isAllowed, isAutoGrowNestedPaths, isIgnoreInvalidFields, isIgnoreUnknownFields, registerCustomEditor, registerCustomEditor, replaceValidators, 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(java.lang.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(java.lang.Object target,
                            java.lang.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 Part, 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, javax.servlet.http.Part, DataBinder.bind(org.springframework.beans.PropertyValues)

isMultipartRequest

private boolean isMultipartRequest(WebRequest request)

Check if the request is a multipart request (by checking its Content-Type header).

Parameters:

request - request with parameters to bind

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