ConditionalOnExpression (Spring Boot API)

@Retention(RUNTIME)
@Target({TYPE,METHOD})
@Documented
@Conditional(org.springframework.boot.autoconfigure.condition.OnExpressionCondition.class)
public @interface ConditionalOnExpression

Configuration annotation for a conditional element that depends on the value of a SpEL expression.

- 可选元素概要
  可选元素
  修饰符和类型可选元素说明
  String value
  The SpEL expression to evaluate.

- 元素详细资料
  - value
```
String value
```
    The SpEL expression to evaluate. Expression should return true if the condition passes or false if it fails.
    返回:
    the SpEL expression
    默认值:
    "true"