函数接口:
这是一个函数接口, 因此可用作 lambda 表达式或方法引用的赋值目标。
```
@FunctionalInterface
public interface RequestPredicate
```
Represents a function that evaluates on a given ServerRequest. Instances of this function that evaluate on common request properties can be found in RequestPredicates.
从以下版本开始:
5.2
作者:
Arjen Poutsma
另请参阅:
RequestPredicates, RouterFunctions.route(RequestPredicate, HandlerFunction), RouterFunctions.nest(RequestPredicate, RouterFunction)

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
`default void`	`accept(RequestPredicates.Visitor visitor)`	Accept the given visitor.
`default RequestPredicate`	`and(RequestPredicate other)`	Return a composed request predicate that tests against both this predicate AND the `other` predicate.
`default RequestPredicate`	`negate()`	Return a predicate that represents the logical negation of this predicate.
`default Optional<ServerRequest>`	`nest(ServerRequest request)`	Transform the given request into a request used for a nested route.
`default RequestPredicate`	`or(RequestPredicate other)`	Return a composed request predicate that tests against both this predicate OR the `other` predicate.
`boolean`	`test(ServerRequest request)`	Evaluate this predicate on the given request.

- 方法详细资料
  - test
```
boolean test(ServerRequest request)
```
    Evaluate this predicate on the given request.
    参数:
    request - the request to match against
    返回:
    true if the request matches the predicate; false otherwise
  - and
```
default RequestPredicate and(RequestPredicate other)
```
    Return a composed request predicate that tests against both this predicate AND the other predicate. When evaluating the composed predicate, if this predicate is false, then the other predicate is not evaluated.
    参数:
    other - a predicate that will be logically-ANDed with this predicate
    返回:
    a predicate composed of this predicate AND the other predicate
  - negate
```
default RequestPredicate negate()
```
    Return a predicate that represents the logical negation of this predicate.
    返回:
    a predicate that represents the logical negation of this predicate
  - or
```
default RequestPredicate or(RequestPredicate other)
```
    Return a composed request predicate that tests against both this predicate OR the other predicate. When evaluating the composed predicate, if this predicate is true, then the other predicate is not evaluated.
    参数:
    other - a predicate that will be logically-ORed with this predicate
    返回:
    a predicate composed of this predicate OR the other predicate
  - nest
```
default Optional<ServerRequest> nest(ServerRequest request)
```
    Transform the given request into a request used for a nested route. For instance, a path-based predicate can return a ServerRequest with a the path remaining after a match.
    The default implementation returns an Optional wrapping the given request if test(ServerRequest) evaluates to true; or Optional.empty() if it evaluates to false.
    参数:
    request - the request to be nested
    返回:
    the nested request
    另请参阅:
    RouterFunctions.nest(RequestPredicate, RouterFunction)
  - accept
```
default void accept(RequestPredicates.Visitor visitor)
```
    Accept the given visitor. Default implementation calls RequestPredicates.Visitor.unknown(RequestPredicate); composed RequestPredicate implementations are expected to call accept for all components that make up this request predicate.
    参数:
    visitor - the visitor to accept

接口 RequestPredicate

方法概要

方法详细资料

test

and

negate

or

nest

accept