所有已知子接口:
BeanWrapper, ConfigurablePropertyAccessor
所有已知实现类:
AbstractNestablePropertyAccessor, AbstractPropertyAccessor, BeanWrapperImpl, DataBinder, DirectFieldAccessor, ExtendedServletRequestDataBinder, ServletRequestDataBinder, SimpleTypeConverter, TypeConverterSupport, WebDataBinder, WebExchangeDataBinder, WebRequestDataBinder
```
public interface TypeConverter
```
Interface that defines type conversion methods. Typically (but not necessarily) implemented in conjunction with the PropertyEditorRegistry interface.
Note: Since TypeConverter implementations are typically based on PropertyEditors which aren't thread-safe, TypeConverters themselves are not to be considered as thread-safe either.
从以下版本开始:
2.0
作者:
Juergen Hoeller
另请参阅:
SimpleTypeConverter, BeanWrapperImpl

方法概要

所有方法实例方法抽象方法默认方法
修饰符和类型	方法	说明
`<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).
`default <T> T`	`convertIfNecessary(Object value, Class<T> requiredType, TypeDescriptor typeDescriptor)`	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).

- 方法详细资料
  - convertIfNecessary
```
@Nullable
<T> T convertIfNecessary(@Nullable
                         Object value,
                         @Nullable
                         Class<T> requiredType)
                  throws TypeMismatchException
```
    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.
    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
```
@Nullable
<T> T convertIfNecessary(@Nullable
                         Object value,
                         @Nullable
                         Class<T> requiredType,
                         @Nullable
                         MethodParameter methodParam)
                  throws TypeMismatchException
```
    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.
    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
```
@Nullable
<T> T convertIfNecessary(@Nullable
                         Object value,
                         @Nullable
                         Class<T> requiredType,
                         @Nullable
                         Field field)
                  throws TypeMismatchException
```
    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.
    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
  - convertIfNecessary
```
@Nullable
default <T> T convertIfNecessary(@Nullable
                                 Object value,
                                 @Nullable
                                 Class<T> requiredType,
                                 @Nullable
                                 TypeDescriptor typeDescriptor)
                          throws TypeMismatchException
```
    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.
    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)
    typeDescriptor - the type descriptor to use (may be null))
    返回:
    the new value, possibly the result of type conversion
    抛出:
    TypeMismatchException - if type conversion failed
    从以下版本开始:
    5.1.4
    另请参阅:
    PropertyEditor.setAsText(String), PropertyEditor.getValue(), ConversionService, Converter

接口 TypeConverter

方法概要

方法详细资料

convertIfNecessary

convertIfNecessary

convertIfNecessary

convertIfNecessary