PathVariable (Spring Framework 4.3.30.RELEASE API)

```
@Target(PARAMETER)
@Retention(RUNTIME)
@Documented
public @interface PathVariable
```
Annotation which indicates that a method parameter should be bound to a URI template variable. Supported for RequestMapping annotated handler methods in Servlet environments.
If the method parameter is Map<String, String> then the map is populated with all path variable names and values.
从以下版本开始:
3.0
作者:
Arjen Poutsma, Juergen Hoeller
另请参阅:
RequestMapping, RequestMappingHandlerAdapter

- 可选元素概要
  可选元素
  修饰符和类型可选元素说明
  String name
  The name of the path variable to bind to.
  boolean required
  Whether the path variable is required.
  String value
  Alias for name().

- 元素详细资料
  - value
```
@AliasFor("name")
String value
```
    Alias for name().
    默认值:
    ""
- - name
```
@AliasFor("value")
String name
```
    The name of the path variable to bind to.
    从以下版本开始:
    4.3.3
    默认值:
    ""
- - required
```
boolean required
```
    Whether the path variable is required.
    Defaults to true, leading to an exception being thrown if the path variable is missing in the incoming request. Switch this to false if you prefer a null or Java 8 java.util.Optional in this case. e.g. on a ModelAttribute method which serves for different requests.
    从以下版本开始:
    4.3.3
    默认值:
    true