java.lang.Object
- org.springframework.validation.DataBinder

所有已实现的接口:
PropertyEditorRegistry, TypeConverter
直接已知子类:
WebDataBinder
```
public class DataBinder
extends Object
implements PropertyEditorRegistry, TypeConverter
```
Binder that allows for setting property values onto a target object, including support for validation and binding result analysis. The binding process can be customized through specifying allowed fields, required fields, custom editors, etc.
Note that there are potential security implications in failing to set an array of allowed fields. In the case of HTTP form POST data for example, malicious clients can attempt to subvert an application by supplying values for fields or properties that do not exist on the form. In some cases this could lead to illegal data being set on command objects or their nested objects. For this reason, it is highly recommended to specify the allowedFields property on the DataBinder.
The binding results can be examined via the BindingResult interface, extending the Errors interface: see the getBindingResult() method. Missing fields and property access exceptions will be converted to FieldErrors, collected in the Errors instance, using the following error codes:
- Missing field error: "required"
- Type mismatch error: "typeMismatch"
- Method invocation error: "methodInvocation"
By default, binding errors get resolved through the BindingErrorProcessor strategy, processing for missing fields and property access exceptions: see the setBindingErrorProcessor(org.springframework.validation.BindingErrorProcessor) method. You can override the default strategy if needed, for example to generate different error codes.
Custom validation errors can be added afterwards. You will typically want to resolve such error codes into proper user-visible error messages; this can be achieved through resolving each error via a MessageSource, which is able to resolve an ObjectError/FieldError through its MessageSource.getMessage(org.springframework.context.MessageSourceResolvable, java.util.Locale) method. The list of message codes can be customized through the MessageCodesResolver strategy: see the setMessageCodesResolver(org.springframework.validation.MessageCodesResolver) method. DefaultMessageCodesResolver's javadoc states details on the default resolution rules.
This generic data binder can be used in any kind of environment. It is typically used by Spring web MVC controllers, via the web-specific subclasses ServletRequestDataBinder and PortletRequestDataBinder.
作者:
Rod Johnson, Juergen Hoeller, Rob Harrop, Stephane Nicoll, Kazuki Shimizu
另请参阅:
setAllowedFields(java.lang.String...), setRequiredFields(java.lang.String...), registerCustomEditor(java.lang.Class<?>, java.beans.PropertyEditor), setMessageCodesResolver(org.springframework.validation.MessageCodesResolver), setBindingErrorProcessor(org.springframework.validation.BindingErrorProcessor), bind(org.springframework.beans.PropertyValues), getBindingResult(), DefaultMessageCodesResolver, DefaultBindingErrorProcessor, MessageSource, ServletRequestDataBinder

字段概要

字段
修饰符和类型	字段	说明
`static int`	`DEFAULT_AUTO_GROW_COLLECTION_LIMIT`	Default limit for array and collection growing: 256
`static String`	`DEFAULT_OBJECT_NAME`	Default object name used for binding: "target"
`protected static Log`	`logger`	We'll create a lot of DataBinder instances: Let's use a static logger.

构造器概要
构造器
构造器说明
DataBinder(Object target)
Create a new DataBinder instance, with default object name.
DataBinder(Object target, String objectName)
Create a new DataBinder instance.

方法概要

所有方法实例方法具体方法已过时的方法
修饰符和类型	方法	说明
`void`	`addCustomFormatter(Formatter<?> formatter)`	Add a custom formatter, applying it to all fields matching the `Formatter`-declared type.
`void`	`addCustomFormatter(Formatter<?> formatter, Class<?>... fieldTypes)`	Add a custom formatter, applying it to the specified field types only, if any, or otherwise to all fields matching the `Formatter`-declared type.
`void`	`addCustomFormatter(Formatter<?> formatter, String... fields)`	Add a custom formatter for the field type specified in `Formatter` class, applying it to the specified fields only, if any, or otherwise to all fields.
`void`	`addValidators(Validator... validators)`	Add Validators to apply after each binding step.
`protected void`	`applyPropertyValues(MutablePropertyValues mpvs)`	Apply given property values to the target object.
`void`	`bind(PropertyValues pvs)`	Bind the given property values to this binder's target.
`protected void`	`checkAllowedFields(MutablePropertyValues mpvs)`	Check the given property values against the allowed fields, removing values for fields that are not allowed.
`protected void`	`checkRequiredFields(MutablePropertyValues mpvs)`	Check the given property values against the required fields, generating missing field errors where appropriate.
`Map<?,?>`	`close()`	Close this DataBinder, which may result in throwing a BindException if it encountered any errors.
`<T> T`	`convertIfNecessary(Object value, Class<T> requiredType)`	Convert the value to the required type (if necessary from a String).
`<T> T`	`convertIfNecessary(Object value, Class<T> requiredType, Field field)`	Convert the value to the required type (if necessary from a String).
`<T> T`	`convertIfNecessary(Object value, Class<T> requiredType, MethodParameter methodParam)`	Convert the value to the required type (if necessary from a String).
`protected AbstractPropertyBindingResult`	`createBeanPropertyBindingResult()`	Create the `AbstractPropertyBindingResult` instance using standard JavaBean property access.
`protected AbstractPropertyBindingResult`	`createDirectFieldBindingResult()`	Create the `AbstractPropertyBindingResult` instance using direct field access.
`protected void`	`doBind(MutablePropertyValues mpvs)`	Actual implementation of the binding process, working with the passed-in MutablePropertyValues instance.
`PropertyEditor`	`findCustomEditor(Class<?> requiredType, String propertyPath)`	Find a custom property editor for the given type and property.
`String[]`	`getAllowedFields()`	Return the fields that should be allowed for binding.
`int`	`getAutoGrowCollectionLimit()`	Return the current limit for array and collection auto-growing.
`BindingErrorProcessor`	`getBindingErrorProcessor()`	Return the strategy for processing binding errors.
`BindingResult`	`getBindingResult()`	Return the BindingResult instance created by this DataBinder.
`ConversionService`	`getConversionService()`	Return the associated ConversionService, if any.
`String[]`	`getDisallowedFields()`	Return the fields that should not be allowed for binding.
`protected AbstractPropertyBindingResult`	`getInternalBindingResult()`	Return the internal BindingResult held by this DataBinder, as an AbstractPropertyBindingResult.
`String`	`getObjectName()`	Return the name of the bound object.
`protected ConfigurablePropertyAccessor`	`getPropertyAccessor()`	Return the underlying PropertyAccessor of this binder's BindingResult.
`protected PropertyEditorRegistry`	`getPropertyEditorRegistry()`	Return the underlying TypeConverter of this binder's BindingResult.
`String[]`	`getRequiredFields()`	Return the fields that are required for each binding process.
`protected SimpleTypeConverter`	`getSimpleTypeConverter()`	Return this binder's underlying SimpleTypeConverter.
`Object`	`getTarget()`	Return the wrapped target object.
`protected TypeConverter`	`getTypeConverter()`	Return the underlying TypeConverter of this binder's BindingResult.
`Validator`	`getValidator()`	Return the primary Validator to apply after each binding step, if any.
`List<Validator>`	`getValidators()`	Return the Validators to apply after data binding.
`void`	`initBeanPropertyAccess()`	Initialize standard JavaBean property access for this DataBinder.
`void`	`initDirectFieldAccess()`	Initialize direct field access for this DataBinder, as alternative to the default bean property access.
`protected boolean`	`isAllowed(String field)`	Return if the given field is allowed for binding.
`boolean`	`isAutoGrowNestedPaths()`	Return whether "auto-growing" of nested paths has been activated.
`boolean`	`isIgnoreInvalidFields()`	Return whether to ignore invalid fields when binding.
`boolean`	`isIgnoreUnknownFields()`	Return whether to ignore unknown fields when binding.
`void`	`registerCustomEditor(Class<?> requiredType, PropertyEditor propertyEditor)`	Register the given custom property editor for all properties of the given type.
`void`	`registerCustomEditor(Class<?> requiredType, String field, PropertyEditor propertyEditor)`	Register the given custom property editor for the given type and property, or for all properties of the given type.
`void`	`replaceValidators(Validator... validators)`	Replace the Validators to apply after each binding step.
`void`	`setAllowedFields(String... allowedFields)`	Register fields that should be allowed for binding.
`void`	`setAutoGrowCollectionLimit(int autoGrowCollectionLimit)`	Specify the limit for array and collection auto-growing.
`void`	`setAutoGrowNestedPaths(boolean autoGrowNestedPaths)`	Set whether this binder should attempt to "auto-grow" a nested path that contains a null value.
`void`	`setBindingErrorProcessor(BindingErrorProcessor bindingErrorProcessor)`	Set the strategy to use for processing binding errors, that is, required field errors and `PropertyAccessException`s.
`void`	`setConversionService(ConversionService conversionService)`	Specify a Spring 3.0 ConversionService to use for converting property values, as an alternative to JavaBeans PropertyEditors.
`void`	`setDisallowedFields(String... disallowedFields)`	Register fields that should not be allowed for binding.
`void`	`setExtractOldValueForEditor(boolean extractOldValueForEditor)`	已过时。 as of Spring 4.3.5, in favor of customizing this in `createBeanPropertyBindingResult()` or `createDirectFieldBindingResult()` itself
`void`	`setIgnoreInvalidFields(boolean ignoreInvalidFields)`	Set whether to ignore invalid fields, that is, whether to ignore bind parameters that have corresponding fields in the target object which are not accessible (for example because of null values in the nested path).
`void`	`setIgnoreUnknownFields(boolean ignoreUnknownFields)`	Set whether to ignore unknown fields, that is, whether to ignore bind parameters that do not have corresponding fields in the target object.
`void`	`setMessageCodesResolver(MessageCodesResolver messageCodesResolver)`	Set the strategy to use for resolving errors into message codes.
`void`	`setRequiredFields(String... requiredFields)`	Register fields that are required for each binding process.
`void`	`setValidator(Validator validator)`	Set the Validator to apply after each binding step.
`void`	`validate()`	Invoke the specified Validators, if any.
`void`	`validate(Object... validationHints)`	Invoke the specified Validators, if any, with the given validation hints.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - DEFAULT_OBJECT_NAME
```
public static final String DEFAULT_OBJECT_NAME
```
    Default object name used for binding: "target"
    另请参阅:
    常量字段值
  - DEFAULT_AUTO_GROW_COLLECTION_LIMIT
```
public static final int DEFAULT_AUTO_GROW_COLLECTION_LIMIT
```
    Default limit for array and collection growing: 256
    另请参阅:
    常量字段值
  - logger
```
protected static final Log logger
```
    We'll create a lot of DataBinder instances: Let's use a static logger.
- 构造器详细资料
  - DataBinder
```
public DataBinder(Object target)
```
    Create a new DataBinder instance, with default object name.
    参数:
    target - the target object to bind onto (or null if the binder is just used to convert a plain parameter value)
    另请参阅:
    DEFAULT_OBJECT_NAME
  - DataBinder
```
public DataBinder(Object target,
                  String objectName)
```
    Create a new DataBinder instance.
    参数:
    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
- 方法详细资料
  - getTarget
```
public Object getTarget()
```
    Return the wrapped target object.
  - getObjectName
```
public String getObjectName()
```
    Return the name of the bound object.
  - setAutoGrowNestedPaths
```
public void setAutoGrowNestedPaths(boolean autoGrowNestedPaths)
```
    Set whether this binder should attempt to "auto-grow" a nested path that contains a null value.
    If "true", a null path location will be populated with a default object value and traversed instead of resulting in an exception. This flag also enables auto-growth of collection elements when accessing an out-of-bounds index.
    Default is "true" on a standard DataBinder. Note that since Spring 4.1 this feature is supported for bean property access (DataBinder's default mode) and field access.
    另请参阅:
    initBeanPropertyAccess(), ConfigurablePropertyAccessor.setAutoGrowNestedPaths(boolean)
  - isAutoGrowNestedPaths
```
public boolean isAutoGrowNestedPaths()
```
    Return whether "auto-growing" of nested paths has been activated.
  - setAutoGrowCollectionLimit
```
public void setAutoGrowCollectionLimit(int autoGrowCollectionLimit)
```
    Specify the limit for array and collection auto-growing.
    Default is 256, preventing OutOfMemoryErrors in case of large indexes. Raise this limit if your auto-growing needs are unusually high.
    另请参阅:
    initBeanPropertyAccess(), BeanWrapper.setAutoGrowCollectionLimit(int)
  - getAutoGrowCollectionLimit
```
public int getAutoGrowCollectionLimit()
```
    Return the current limit for array and collection auto-growing.
  - initBeanPropertyAccess
```
public void initBeanPropertyAccess()
```
    Initialize standard JavaBean property access for this DataBinder.
    This is the default; an explicit call just leads to eager initialization.
    另请参阅:
    initDirectFieldAccess(), createBeanPropertyBindingResult()
  - createBeanPropertyBindingResult
```
protected AbstractPropertyBindingResult createBeanPropertyBindingResult()
```
    Create the AbstractPropertyBindingResult instance using standard JavaBean property access.
    从以下版本开始:
    4.2.1
  - initDirectFieldAccess
```
public void initDirectFieldAccess()
```
    Initialize direct field access for this DataBinder, as alternative to the default bean property access.
    另请参阅:
    initBeanPropertyAccess(), createDirectFieldBindingResult()
  - createDirectFieldBindingResult
```
protected AbstractPropertyBindingResult createDirectFieldBindingResult()
```
    Create the AbstractPropertyBindingResult instance using direct field access.
    从以下版本开始:
    4.2.1
  - getInternalBindingResult
```
protected AbstractPropertyBindingResult getInternalBindingResult()
```
    Return the internal BindingResult held by this DataBinder, as an AbstractPropertyBindingResult.
  - getPropertyAccessor
```
protected ConfigurablePropertyAccessor getPropertyAccessor()
```
    Return the underlying PropertyAccessor of this binder's BindingResult.
  - getSimpleTypeConverter
```
protected SimpleTypeConverter getSimpleTypeConverter()
```
    Return this binder's underlying SimpleTypeConverter.
  - getPropertyEditorRegistry
```
protected PropertyEditorRegistry getPropertyEditorRegistry()
```
    Return the underlying TypeConverter of this binder's BindingResult.
  - getTypeConverter
```
protected TypeConverter getTypeConverter()
```
    Return the underlying TypeConverter of this binder's BindingResult.
  - getBindingResult
```
public BindingResult getBindingResult()
```
    Return the BindingResult instance created by this DataBinder. This allows for convenient access to the binding results after a bind operation.
    返回:
    the BindingResult instance, to be treated as BindingResult or as Errors instance (Errors is a super-interface of BindingResult)
    另请参阅:
    Errors, bind(org.springframework.beans.PropertyValues)
  - setIgnoreUnknownFields
```
public void setIgnoreUnknownFields(boolean ignoreUnknownFields)
```
    Set whether to ignore unknown fields, that is, whether to ignore bind parameters that do not have corresponding fields in the target object.
    Default is "true". Turn this off to enforce that all bind parameters must have a matching field in the target object.
    Note that this setting only applies to binding operations on this DataBinder, not to retrieving values via its BindingResult.
    另请参阅:
    bind(org.springframework.beans.PropertyValues)
  - isIgnoreUnknownFields
```
public boolean isIgnoreUnknownFields()
```
    Return whether to ignore unknown fields when binding.
  - setIgnoreInvalidFields
```
public void setIgnoreInvalidFields(boolean ignoreInvalidFields)
```
    Set whether to ignore invalid fields, that is, whether to ignore bind parameters that have corresponding fields in the target object which are not accessible (for example because of null values in the nested path).
    Default is "false". Turn this on to ignore bind parameters for nested objects in non-existing parts of the target object graph.
    Note that this setting only applies to binding operations on this DataBinder, not to retrieving values via its BindingResult.
    另请参阅:
    bind(org.springframework.beans.PropertyValues)
  - isIgnoreInvalidFields
```
public boolean isIgnoreInvalidFields()
```
    Return whether to ignore invalid fields when binding.
  - setAllowedFields
```
public void setAllowedFields(String... allowedFields)
```
    Register fields that should be allowed for binding. Default is all fields. Restrict this for example to avoid unwanted modifications by malicious users when binding HTTP request parameters.
    Supports "xxx*", "*xxx" and "*xxx*" patterns. More sophisticated matching can be implemented by overriding the isAllowed method.
    Alternatively, specify a list of disallowed fields.
    参数:
    allowedFields - array of field names
    另请参阅:
    setDisallowedFields(java.lang.String...), isAllowed(String), ServletRequestDataBinder
  - getAllowedFields
```
public String[] getAllowedFields()
```
    Return the fields that should be allowed for binding.
    返回:
    array of field names
  - setDisallowedFields
```
public void setDisallowedFields(String... disallowedFields)
```
    Register fields that should not be allowed for binding. Default is none. Mark fields as disallowed for example to avoid unwanted modifications by malicious users when binding HTTP request parameters.
    Supports "xxx*", "*xxx" and "*xxx*" patterns. More sophisticated matching can be implemented by overriding the isAllowed method.
    Alternatively, specify a list of allowed fields.
    参数:
    disallowedFields - array of field names
    另请参阅:
    setAllowedFields(java.lang.String...), isAllowed(String), ServletRequestDataBinder
  - getDisallowedFields
```
public String[] getDisallowedFields()
```
    Return the fields that should not be allowed for binding.
    返回:
    array of field names
  - setRequiredFields
```
public void setRequiredFields(String... requiredFields)
```
    Register fields that are required for each binding process.
    If one of the specified fields is not contained in the list of incoming property values, a corresponding "missing field" error will be created, with error code "required" (by the default binding error processor).
    参数:
    requiredFields - array of field names
    另请参阅:
    setBindingErrorProcessor(org.springframework.validation.BindingErrorProcessor), DefaultBindingErrorProcessor.MISSING_FIELD_ERROR_CODE
  - getRequiredFields
```
public String[] getRequiredFields()
```
    Return the fields that are required for each binding process.
    返回:
    array of field names
  - setExtractOldValueForEditor
```
@Deprecated
public void setExtractOldValueForEditor(boolean extractOldValueForEditor)
```
    已过时。
    as of Spring 4.3.5, in favor of customizing this in createBeanPropertyBindingResult() or createDirectFieldBindingResult() itself
    Set whether to extract the old field value when applying a property editor to a new value for a field.
    Default is "true", exposing previous field values to custom editors. Turn this to "false" to avoid side effects caused by getters.
  - setMessageCodesResolver
```
public void setMessageCodesResolver(MessageCodesResolver messageCodesResolver)
```
    Set the strategy to use for resolving errors into message codes. Applies the given strategy to the underlying errors holder.
    Default is a DefaultMessageCodesResolver.
    另请参阅:
    AbstractBindingResult.setMessageCodesResolver(org.springframework.validation.MessageCodesResolver), DefaultMessageCodesResolver
  - setBindingErrorProcessor
```
public void setBindingErrorProcessor(BindingErrorProcessor bindingErrorProcessor)
```
    Set the strategy to use for processing binding errors, that is, required field errors and PropertyAccessExceptions.
    Default is a DefaultBindingErrorProcessor.
    另请参阅:
    DefaultBindingErrorProcessor
  - getBindingErrorProcessor
```
public BindingErrorProcessor getBindingErrorProcessor()
```
    Return the strategy for processing binding errors.
  - setValidator
```
public void setValidator(Validator validator)
```
    Set the Validator to apply after each binding step.
    另请参阅:
    addValidators(Validator...), replaceValidators(Validator...)
  - addValidators
```
public void addValidators(Validator... validators)
```
    Add Validators to apply after each binding step.
    另请参阅:
    setValidator(Validator), replaceValidators(Validator...)
  - replaceValidators
```
public void replaceValidators(Validator... validators)
```
    Replace the Validators to apply after each binding step.
    另请参阅:
    setValidator(Validator), addValidators(Validator...)
  - getValidator
```
public Validator getValidator()
```
    Return the primary Validator to apply after each binding step, if any.
  - getValidators
```
public List<Validator> getValidators()
```
    Return the Validators to apply after data binding.
  - setConversionService
```
public void setConversionService(ConversionService conversionService)
```
    Specify a Spring 3.0 ConversionService to use for converting property values, as an alternative to JavaBeans PropertyEditors.
  - getConversionService
```
public ConversionService getConversionService()
```
    Return the associated ConversionService, if any.
  - addCustomFormatter
```
public void addCustomFormatter(Formatter<?> formatter)
```
    Add a custom formatter, applying it to all fields matching the Formatter-declared type.
    Registers a corresponding PropertyEditor adapter underneath the covers.
    参数:
    formatter - the formatter to add, generically declared for a specific type
    从以下版本开始:
    4.2
    另请参阅:
    registerCustomEditor(Class, PropertyEditor)
  - addCustomFormatter
```
public void addCustomFormatter(Formatter<?> formatter,
                               String... fields)
```
    Add a custom formatter for the field type specified in Formatter class, applying it to the specified fields only, if any, or otherwise to all fields.
    Registers a corresponding PropertyEditor adapter underneath the covers.
    参数:
    formatter - the formatter to add, generically declared for a specific type
    fields - the fields to apply the formatter to, or none if to be applied to all
    从以下版本开始:
    4.2
    另请参阅:
    registerCustomEditor(Class, String, PropertyEditor)
  - addCustomFormatter
```
public void addCustomFormatter(Formatter<?> formatter,
                               Class<?>... fieldTypes)
```
    Add a custom formatter, applying it to the specified field types only, if any, or otherwise to all fields matching the Formatter-declared type.
    Registers a corresponding PropertyEditor adapter underneath the covers.
    参数:
    formatter - the formatter to add (does not need to generically declare a field type if field types are explicitly specified as parameters)
    fieldTypes - the field types to apply the formatter to, or none if to be derived from the given Formatter implementation class
    从以下版本开始:
    4.2
    另请参阅:
    registerCustomEditor(Class, PropertyEditor)
  - registerCustomEditor
```
public void registerCustomEditor(Class<?> requiredType,
                                 PropertyEditor propertyEditor)
```
    从接口复制的说明: PropertyEditorRegistry
    Register the given custom property editor for all properties of the given type.
    指定者:
    registerCustomEditor 在接口中 PropertyEditorRegistry
    参数:
    requiredType - the type of the property
    propertyEditor - the editor to register
  - registerCustomEditor
```
public void registerCustomEditor(Class<?> requiredType,
                                 String field,
                                 PropertyEditor propertyEditor)
```
    从接口复制的说明: PropertyEditorRegistry
    Register the given custom property editor for the given type and property, or for all properties of the given type.
    If the property path denotes an array or Collection property, the editor will get applied either to the array/Collection itself (the PropertyEditor has to create an array or Collection value) or to each element (the PropertyEditor has to create the element type), depending on the specified required type.
    Note: Only one single registered custom editor per property path is supported. In the case of a Collection/array, do not register an editor for both the Collection/array and each element on the same property.
    For example, if you wanted to register an editor for "items[n].quantity" (for all values n), you would use "items.quantity" as the value of the 'propertyPath' argument to this method.
    指定者:
    registerCustomEditor 在接口中 PropertyEditorRegistry
    参数:
    requiredType - the type of the property. This may be null if a property is given but should be specified in any case, in particular in case of a Collection - making clear whether the editor is supposed to apply to the entire Collection itself or to each of its entries. So as a general rule: Do not specify null here in case of a Collection/array!
    field - the path of the property (name or nested path), or null if registering an editor for all properties of the given type
    propertyEditor - editor to register
  - findCustomEditor
```
public PropertyEditor findCustomEditor(Class<?> requiredType,
                                       String propertyPath)
```
    从接口复制的说明: PropertyEditorRegistry
    Find a custom property editor for the given type and property.
    指定者:
    findCustomEditor 在接口中 PropertyEditorRegistry
    参数:
    requiredType - the type of the property (can be null if a property is given but should be specified in any case for consistency checking)
    propertyPath - the path of the property (name or nested path), or null if looking for an editor for all properties of the given type
    返回:
    the registered editor, or null if none
  - convertIfNecessary
```
public <T> T convertIfNecessary(Object value,
                                Class<T> requiredType)
                         throws TypeMismatchException
```
    从接口复制的说明: TypeConverter
    Convert the value to the required type (if necessary from a String).
    Conversions from String to any type will typically use the setAsText method of the PropertyEditor class, or a Spring Converter in a ConversionService.
    指定者:
    convertIfNecessary 在接口中 TypeConverter
    参数:
    value - the value to convert
    requiredType - the type we must convert to (or null if not known, for example in case of a collection element)
    返回:
    the new value, possibly the result of type conversion
    抛出:
    TypeMismatchException - if type conversion failed
    另请参阅:
    PropertyEditor.setAsText(String), PropertyEditor.getValue(), ConversionService, Converter
  - convertIfNecessary
```
public <T> T convertIfNecessary(Object value,
                                Class<T> requiredType,
                                MethodParameter methodParam)
                         throws TypeMismatchException
```
    从接口复制的说明: TypeConverter
    Convert the value to the required type (if necessary from a String).
    Conversions from String to any type will typically use the setAsText method of the PropertyEditor class, or a Spring Converter in a ConversionService.
    指定者:
    convertIfNecessary 在接口中 TypeConverter
    参数:
    value - the value to convert
    requiredType - the type we must convert to (or null if not known, for example in case of a collection element)
    methodParam - the method parameter that is the target of the conversion (for analysis of generic types; may be null)
    返回:
    the new value, possibly the result of type conversion
    抛出:
    TypeMismatchException - if type conversion failed
    另请参阅:
    PropertyEditor.setAsText(String), PropertyEditor.getValue(), ConversionService, Converter
  - convertIfNecessary
```
public <T> T convertIfNecessary(Object value,
                                Class<T> requiredType,
                                Field field)
                         throws TypeMismatchException
```
    从接口复制的说明: TypeConverter
    Convert the value to the required type (if necessary from a String).
    Conversions from String to any type will typically use the setAsText method of the PropertyEditor class, or a Spring Converter in a ConversionService.
    指定者:
    convertIfNecessary 在接口中 TypeConverter
    参数:
    value - the value to convert
    requiredType - the type we must convert to (or null if not known, for example in case of a collection element)
    field - the reflective field that is the target of the conversion (for analysis of generic types; may be null)
    返回:
    the new value, possibly the result of type conversion
    抛出:
    TypeMismatchException - if type conversion failed
    另请参阅:
    PropertyEditor.setAsText(String), PropertyEditor.getValue(), ConversionService, Converter
  - bind
```
public void bind(PropertyValues pvs)
```
    Bind the given property values to this binder's target.
    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").
    Note that the given PropertyValues should be a throwaway instance: For efficiency, it will be modified to just contain allowed fields if it implements the MutablePropertyValues interface; else, an internal mutable copy will be created for this purpose. Pass in a copy of the PropertyValues if you want your original instance to stay unmodified in any case.
    参数:
    pvs - property values to bind
    另请参阅:
    doBind(org.springframework.beans.MutablePropertyValues)
  - doBind
```
protected void doBind(MutablePropertyValues mpvs)
```
    Actual implementation of the binding process, working with the passed-in MutablePropertyValues instance.
    参数:
    mpvs - the property values to bind, as MutablePropertyValues instance
    另请参阅:
    checkAllowedFields(org.springframework.beans.MutablePropertyValues), checkRequiredFields(org.springframework.beans.MutablePropertyValues), applyPropertyValues(org.springframework.beans.MutablePropertyValues)
  - checkAllowedFields
```
protected void checkAllowedFields(MutablePropertyValues mpvs)
```
    Check the given property values against the allowed fields, removing values for fields that are not allowed.
    参数:
    mpvs - the property values to be bound (can be modified)
    另请参阅:
    getAllowedFields(), isAllowed(String)
  - isAllowed
```
protected boolean isAllowed(String field)
```
    Return if the given field is allowed for binding. Invoked for each passed-in property value.
    The default implementation checks for "xxx*", "*xxx" and "*xxx*" matches, as well as direct equality, in the specified lists of allowed fields and disallowed fields. A field matching a disallowed pattern will not be accepted even if it also happens to match a pattern in the allowed list.
    Can be overridden in subclasses.
    参数:
    field - the field to check
    返回:
    if the field is allowed
    另请参阅:
    setAllowedFields(java.lang.String...), setDisallowedFields(java.lang.String...), PatternMatchUtils.simpleMatch(String, String)
  - checkRequiredFields
```
protected void checkRequiredFields(MutablePropertyValues mpvs)
```
    Check the given property values against the required fields, generating missing field errors where appropriate.
    参数:
    mpvs - the property values to be bound (can be modified)
    另请参阅:
    getRequiredFields(), getBindingErrorProcessor(), BindingErrorProcessor.processMissingFieldError(java.lang.String, org.springframework.validation.BindingResult)
  - applyPropertyValues
```
protected void applyPropertyValues(MutablePropertyValues mpvs)
```
    Apply given property values to the target object.
    Default implementation applies all of the supplied property values as bean property values. By default, unknown fields will be ignored.
    参数:
    mpvs - the property values to be bound (can be modified)
    另请参阅:
    getTarget(), getPropertyAccessor(), isIgnoreUnknownFields(), getBindingErrorProcessor(), BindingErrorProcessor.processPropertyAccessException(org.springframework.beans.PropertyAccessException, org.springframework.validation.BindingResult)
  - validate
```
public void validate()
```
    Invoke the specified Validators, if any.
    另请参阅:
    setValidator(Validator), getBindingResult()
  - validate
```
public void validate(Object... validationHints)
```
    Invoke the specified Validators, if any, with the given validation hints.
    Note: Validation hints may get ignored by the actual target Validator.
    参数:
    validationHints - one or more hint objects to be passed to a SmartValidator
    另请参阅:
    setValidator(Validator), SmartValidator.validate(Object, Errors, Object...)
  - close
```
public Map<?,?> close()
                     throws BindException
```
    Close this DataBinder, which may result in throwing a BindException if it encountered any errors.
    返回:
    the model Map, containing target object and Errors instance
    抛出:
    BindException - if there were any errors in the bind operation
    另请参阅:
    BindingResult.getModel()

构造器	说明
`DataBinder(Object target)`	Create a new DataBinder instance, with default object name.
`DataBinder(Object target, String objectName)`	Create a new DataBinder instance.

类 DataBinder

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

DEFAULT_OBJECT_NAME

DEFAULT_AUTO_GROW_COLLECTION_LIMIT

logger

构造器详细资料

DataBinder

DataBinder

方法详细资料

getTarget

getObjectName

setAutoGrowNestedPaths

isAutoGrowNestedPaths

setAutoGrowCollectionLimit

getAutoGrowCollectionLimit

initBeanPropertyAccess

createBeanPropertyBindingResult

initDirectFieldAccess

createDirectFieldBindingResult

getInternalBindingResult

getPropertyAccessor

getSimpleTypeConverter

getPropertyEditorRegistry

getTypeConverter

getBindingResult

setIgnoreUnknownFields

isIgnoreUnknownFields

setIgnoreInvalidFields

isIgnoreInvalidFields

setAllowedFields

getAllowedFields

setDisallowedFields

getDisallowedFields

setRequiredFields

getRequiredFields

setExtractOldValueForEditor

setMessageCodesResolver

setBindingErrorProcessor

getBindingErrorProcessor

setValidator

addValidators

replaceValidators

getValidator

getValidators

setConversionService

getConversionService

addCustomFormatter

addCustomFormatter

addCustomFormatter

registerCustomEditor

registerCustomEditor

findCustomEditor

convertIfNecessary

convertIfNecessary

convertIfNecessary

bind

doBind

checkAllowedFields

isAllowed

checkRequiredFields

applyPropertyValues

validate

validate

close