org.springframework.beans

接口 PropertyAccessor

所有已知子接口:

BeanWrapper, ConfigurablePropertyAccessor

所有已知实现类:

AbstractNestablePropertyAccessor, AbstractPropertyAccessor, BeanWrapperImpl, DirectFieldAccessor

public interface PropertyAccessor

Common interface for classes that can access named properties (such as bean properties of an object or fields in an object) Serves as base interface for BeanWrapper.

从以下版本开始:

1.1

作者:

Juergen Hoeller

另请参阅:

BeanWrapper, PropertyAccessorFactory.forBeanPropertyAccess(java.lang.Object), PropertyAccessorFactory.forDirectFieldAccess(java.lang.Object)

字段概要

字段

限定符和类型	字段和说明
static String	NESTED_PROPERTY_SEPARATOR Path separator for nested properties.
static char	NESTED_PROPERTY_SEPARATOR_CHAR
static String	PROPERTY_KEY_PREFIX Marker that indicates the start of a property key for an indexed or mapped property like "person.addresses[0]".
static char	PROPERTY_KEY_PREFIX_CHAR
static String	PROPERTY_KEY_SUFFIX Marker that indicates the end of a property key for an indexed or mapped property like "person.addresses[0]".
static char	PROPERTY_KEY_SUFFIX_CHAR

方法概要

限定符和类型	方法和说明
Class<?>	getPropertyType(String propertyName) Determine the property type for the specified property, either checking the property descriptor or checking the value in case of an indexed or mapped element.
org.springframework.core.convert.TypeDescriptor	getPropertyTypeDescriptor(String propertyName) Return a type descriptor for the specified property: preferably from the read method, falling back to the write method.
Object	getPropertyValue(String propertyName) Get the current value of the specified property.
boolean	isReadableProperty(String propertyName) Determine whether the specified property is readable.
boolean	isWritableProperty(String propertyName) Determine whether the specified property is writable.
void	setPropertyValue(PropertyValue pv) Set the specified value as current property value.
void	setPropertyValue(String propertyName, Object value) Set the specified value as current property value.
void	setPropertyValues(Map<?,?> map) Perform a batch update from a Map.
void	setPropertyValues(PropertyValues pvs) The preferred way to perform a batch update.
void	setPropertyValues(PropertyValues pvs, boolean ignoreUnknown) Perform a batch update with more control over behavior.
void	setPropertyValues(PropertyValues pvs, boolean ignoreUnknown, boolean ignoreInvalid) Perform a batch update with full control over behavior.

字段详细资料

NESTED_PROPERTY_SEPARATOR

static final String NESTED_PROPERTY_SEPARATOR

Path separator for nested properties. Follows normal Java conventions: getFoo().getBar() would be "foo.bar".

另请参阅:

常量字段值

NESTED_PROPERTY_SEPARATOR_CHAR

static final char NESTED_PROPERTY_SEPARATOR_CHAR

另请参阅:

常量字段值

PROPERTY_KEY_PREFIX

static final String PROPERTY_KEY_PREFIX

Marker that indicates the start of a property key for an indexed or mapped property like "person.addresses[0]".

另请参阅:

常量字段值

PROPERTY_KEY_PREFIX_CHAR

static final char PROPERTY_KEY_PREFIX_CHAR

另请参阅:

常量字段值

PROPERTY_KEY_SUFFIX

static final String PROPERTY_KEY_SUFFIX

Marker that indicates the end of a property key for an indexed or mapped property like "person.addresses[0]".

另请参阅:

常量字段值

PROPERTY_KEY_SUFFIX_CHAR

static final char PROPERTY_KEY_SUFFIX_CHAR

另请参阅:

常量字段值

方法详细资料

isReadableProperty

boolean isReadableProperty(String propertyName)

Determine whether the specified property is readable.

Returns false if the property doesn't exist.

参数:

propertyName - the property to check (may be a nested path and/or an indexed/mapped property)

返回:

whether the property is readable

isWritableProperty

boolean isWritableProperty(String propertyName)

Determine whether the specified property is writable.

Returns false if the property doesn't exist.

参数:

propertyName - the property to check (may be a nested path and/or an indexed/mapped property)

返回:

whether the property is writable

getPropertyType

@Nullable
Class<?> getPropertyType(String propertyName)
                             throws BeansException

Determine the property type for the specified property, either checking the property descriptor or checking the value in case of an indexed or mapped element.

参数:

propertyName - the property to check (may be a nested path and/or an indexed/mapped property)

返回:

the property type for the particular property, or null if not determinable

抛出:

PropertyAccessException - if the property was valid but the accessor method failed

BeansException

getPropertyTypeDescriptor

@Nullable
org.springframework.core.convert.TypeDescriptor getPropertyTypeDescriptor(String propertyName)
                                                                              throws BeansException

Return a type descriptor for the specified property: preferably from the read method, falling back to the write method.

参数:

propertyName - the property to check (may be a nested path and/or an indexed/mapped property)

返回:

the property type for the particular property, or null if not determinable

抛出:

PropertyAccessException - if the property was valid but the accessor method failed

BeansException

getPropertyValue

@Nullable
Object getPropertyValue(String propertyName)
                            throws BeansException

Get the current value of the specified property.

参数:

propertyName - the name of the property to get the value of (may be a nested path and/or an indexed/mapped property)

返回:

the value of the property

抛出:

InvalidPropertyException - if there is no such property or if the property isn't readable

PropertyAccessException - if the property was valid but the accessor method failed

BeansException

setPropertyValue

void setPropertyValue(String propertyName,
                      @Nullable
                      Object value)
               throws BeansException

Set the specified value as current property value.

参数:

propertyName - the name of the property to set the value of (may be a nested path and/or an indexed/mapped property)

value - the new value

抛出:

InvalidPropertyException - if there is no such property or if the property isn't writable

PropertyAccessException - if the property was valid but the accessor method failed or a type mismatch occurred

BeansException

setPropertyValue

void setPropertyValue(PropertyValue pv)
               throws BeansException

Set the specified value as current property value.

参数:

pv - an object containing the new property value

抛出:

InvalidPropertyException - if there is no such property or if the property isn't writable

PropertyAccessException - if the property was valid but the accessor method failed or a type mismatch occurred

BeansException

setPropertyValues

void setPropertyValues(Map<?,?> map)
                throws BeansException

Perform a batch update from a Map.

Bulk updates from PropertyValues are more powerful: This method is provided for convenience. Behavior will be identical to that of the setPropertyValues(PropertyValues) method.

参数:

map - Map to take properties from. Contains property value objects, keyed by property name

抛出:

InvalidPropertyException - if there is no such property or if the property isn't writable

PropertyBatchUpdateException - if one or more PropertyAccessExceptions occurred for specific properties during the batch update. This exception bundles all individual PropertyAccessExceptions. All other properties will have been successfully updated.

BeansException

setPropertyValues

void setPropertyValues(PropertyValues pvs)
                throws BeansException

The preferred way to perform a batch update.

Note that performing a batch update differs from performing a single update, in that an implementation of this class will continue to update properties if a recoverable error (such as a type mismatch, but not an invalid field name or the like) is encountered, throwing a PropertyBatchUpdateException containing all the individual errors. This exception can be examined later to see all binding errors. Properties that were successfully updated remain changed.

Does not allow unknown fields or invalid fields.

参数:

pvs - PropertyValues to set on the target object

抛出:

InvalidPropertyException - if there is no such property or if the property isn't writable

PropertyBatchUpdateException - if one or more PropertyAccessExceptions occurred for specific properties during the batch update. This exception bundles all individual PropertyAccessExceptions. All other properties will have been successfully updated.

BeansException

另请参阅:

setPropertyValues(PropertyValues, boolean, boolean)

setPropertyValues

void setPropertyValues(PropertyValues pvs,
                       boolean ignoreUnknown)
                throws BeansException

Perform a batch update with more control over behavior.

Note that performing a batch update differs from performing a single update, in that an implementation of this class will continue to update properties if a recoverable error (such as a type mismatch, but not an invalid field name or the like) is encountered, throwing a PropertyBatchUpdateException containing all the individual errors. This exception can be examined later to see all binding errors. Properties that were successfully updated remain changed.

参数:

pvs - PropertyValues to set on the target object

ignoreUnknown - should we ignore unknown properties (not found in the bean)

抛出:

InvalidPropertyException - if there is no such property or if the property isn't writable

PropertyBatchUpdateException - if one or more PropertyAccessExceptions occurred for specific properties during the batch update. This exception bundles all individual PropertyAccessExceptions. All other properties will have been successfully updated.

BeansException

另请参阅:

setPropertyValues(PropertyValues, boolean, boolean)

setPropertyValues

void setPropertyValues(PropertyValues pvs,
                       boolean ignoreUnknown,
                       boolean ignoreInvalid)
                throws BeansException

Perform a batch update with full control over behavior.

Note that performing a batch update differs from performing a single update, in that an implementation of this class will continue to update properties if a recoverable error (such as a type mismatch, but not an invalid field name or the like) is encountered, throwing a PropertyBatchUpdateException containing all the individual errors. This exception can be examined later to see all binding errors. Properties that were successfully updated remain changed.

参数:

pvs - PropertyValues to set on the target object

ignoreUnknown - should we ignore unknown properties (not found in the bean)

ignoreInvalid - should we ignore invalid properties (found but not accessible)

抛出:

InvalidPropertyException - if there is no such property or if the property isn't writable

PropertyBatchUpdateException - if one or more PropertyAccessExceptions occurred for specific properties during the batch update. This exception bundles all individual PropertyAccessExceptions. All other properties will have been successfully updated.

BeansException