NumberFormat (Spring Framework 4.3.30.RELEASE API)

```
@Documented
@Retention(RUNTIME)
@Target({METHOD,FIELD,PARAMETER,ANNOTATION_TYPE})
public @interface NumberFormat
```
Declares that a field or method parameter should be formatted as a number.
Supports formatting by style or custom pattern string. Can be applied to any JDK java.lang.Number type.
For style-based formatting, set the style() attribute to be the desired NumberFormat.Style. For custom formatting, set the pattern() attribute to be the number pattern, such as #, ###.##.
Each attribute is mutually exclusive, so only set one attribute per annotation instance (the one most convenient one for your formatting needs). When the pattern() attribute is specified, it takes precedence over the style() attribute. When no annotation attributes are specified, the default format applied is style-based for either number of currency, depending on the annotated field or method parameter type.
从以下版本开始:
3.0
作者:
Keith Donald, Juergen Hoeller
另请参阅:
NumberFormat

- 可选元素概要
  可选元素
  修饰符和类型可选元素说明
  String pattern
  The custom pattern to use to format the field.
  NumberFormat.Style style
  The style pattern to use to format the field.

- 元素详细资料
  - style
```
NumberFormat.Style style
```
    The style pattern to use to format the field.
    Defaults to NumberFormat.Style.DEFAULT for general-purpose number formatting for most annotated types, except for money types which default to currency formatting. Set this attribute when you wish to format your field in accordance with a common style other than the default style.
    默认值:
    org.springframework.format.annotation.NumberFormat.Style.DEFAULT
- - pattern
```
String pattern
```
    The custom pattern to use to format the field.
    Defaults to empty String, indicating no custom pattern String has been specified. Set this attribute when you wish to format your field in accordance with a custom number pattern not represented by a style.
    默认值:
    ""