所有已知子接口:
CompilablePropertyAccessor
所有已知实现类:
BeanExpressionContextAccessor, BeanFactoryAccessor, DataBindingPropertyAccessor, EnvironmentAccessor, MapAccessor, ReflectivePropertyAccessor, ReflectivePropertyAccessor.OptimalPropertyAccessor
```
public interface PropertyAccessor
```
A property accessor is able to read from (and possibly write to) an object's properties.
This interface places no restrictions, and so implementors are free to access properties directly as fields or through getters or in any other way they see as appropriate.
A resolver can optionally specify an array of target classes for which it should be called. However, if it returns null from getSpecificTargetClasses(), it will be called for all property references and given a chance to determine if it can read or write them.
Property resolvers are considered to be ordered, and each will be called in turn. The only rule that affects the call order is that any resolver naming the target class directly in getSpecificTargetClasses() will be called first, before the general resolvers.
从以下版本开始:
3.0
作者:
Andy Clement

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`boolean`	`canRead(EvaluationContext context, Object target, String name)`	Called to determine if a resolver instance is able to access a specified property on a specified target object.
`boolean`	`canWrite(EvaluationContext context, Object target, String name)`	Called to determine if a resolver instance is able to write to a specified property on a specified target object.
`Class<?>[]`	`getSpecificTargetClasses()`	Return an array of classes for which this resolver should be called.
`TypedValue`	`read(EvaluationContext context, Object target, String name)`	Called to read a property from a specified target object.
`void`	`write(EvaluationContext context, Object target, String name, Object newValue)`	Called to write to a property on a specified target object.

- 方法详细资料
  - getSpecificTargetClasses
```
@Nullable
Class<?>[] getSpecificTargetClasses()
```
    Return an array of classes for which this resolver should be called.
    Returning null indicates this is a general resolver that can be called in an attempt to resolve a property on any type.
    返回:
    an array of classes that this resolver is suitable for (or null if a general resolver)
  - canRead
```
boolean canRead(EvaluationContext context,
                @Nullable
                Object target,
                String name)
         throws AccessException
```
    Called to determine if a resolver instance is able to access a specified property on a specified target object.
    参数:
    context - the evaluation context in which the access is being attempted
    target - the target object upon which the property is being accessed
    name - the name of the property being accessed
    返回:
    true if this resolver is able to read the property
    抛出:
    AccessException - if there is any problem determining whether the property can be read
  - read
```
TypedValue read(EvaluationContext context,
                @Nullable
                Object target,
                String name)
         throws AccessException
```
    Called to read a property from a specified target object. Should only succeed if canRead(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String) also returns true.
    参数:
    context - the evaluation context in which the access is being attempted
    target - the target object upon which the property is being accessed
    name - the name of the property being accessed
    返回:
    a TypedValue object wrapping the property value read and a type descriptor for it
    抛出:
    AccessException - if there is any problem accessing the property value
  - canWrite
```
boolean canWrite(EvaluationContext context,
                 @Nullable
                 Object target,
                 String name)
          throws AccessException
```
    Called to determine if a resolver instance is able to write to a specified property on a specified target object.
    参数:
    context - the evaluation context in which the access is being attempted
    target - the target object upon which the property is being accessed
    name - the name of the property being accessed
    返回:
    true if this resolver is able to write to the property
    抛出:
    AccessException - if there is any problem determining whether the property can be written to
  - write
```
void write(EvaluationContext context,
           @Nullable
           Object target,
           String name,
           @Nullable
           Object newValue)
    throws AccessException
```
    Called to write to a property on a specified target object. Should only succeed if canWrite(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String) also returns true.
    参数:
    context - the evaluation context in which the access is being attempted
    target - the target object upon which the property is being accessed
    name - the name of the property being accessed
    newValue - the new value for the property
    抛出:
    AccessException - if there is any problem writing to the property value

接口 PropertyAccessor

方法概要

方法详细资料

getSpecificTargetClasses

canRead

read

canWrite

write