TypeConverter (Spring Framework 4.3.30.RELEASE API)

所有已知实现类:
StandardTypeConverter
```
public interface TypeConverter
```
A type converter can convert values between different types encountered during expression evaluation. This is an SPI for the expression parser; see ConversionService for the primary user API to Spring's conversion facilities.
从以下版本开始:
3.0
作者:
Andy Clement, Juergen Hoeller

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`	`canConvert(TypeDescriptor sourceType, TypeDescriptor targetType)`	Return `true` if the type converter can convert the specified type to the desired target type.
`Object`	`convertValue(Object value, TypeDescriptor sourceType, TypeDescriptor targetType)`	Convert (or coerce) a value from one type to another, for example from a `boolean` to a `String`.

- 方法详细资料
  - canConvert
```
boolean canConvert(TypeDescriptor sourceType,
                   TypeDescriptor targetType)
```
    Return true if the type converter can convert the specified type to the desired target type.
    参数:
    sourceType - a type descriptor that describes the source type
    targetType - a type descriptor that describes the requested result type
    返回:
    true if that conversion can be performed
  - convertValue
```
Object convertValue(Object value,
                    TypeDescriptor sourceType,
                    TypeDescriptor targetType)
```
    Convert (or coerce) a value from one type to another, for example from a boolean to a String.
    The TypeDescriptor parameters enable support for typed collections: A caller may prefer a List<Integer>, for example, rather than simply any List.
    参数:
    value - the value to be converted
    sourceType - a type descriptor that supplies extra information about the source object
    targetType - a type descriptor that supplies extra information about the requested result type
    返回:
    the converted value
    抛出:
    EvaluationException - if conversion failed or is not possible to begin with