ConditionalOnMissingFilterBean (Spring Boot API)

```
@Target({TYPE,METHOD})
@Retention(RUNTIME)
@Documented
@ConditionalOnMissingBean(parameterizedContainer=org.springframework.boot.web.servlet.FilterRegistrationBean.class)
public @interface ConditionalOnMissingFilterBean
```
Conditional that only matches when no Filter beans of the specified type are contained in the BeanFactory. This condition will detect both directly register Filter beans as well as those registered via a FilterRegistrationBean.
When placed on a @Bean method, the bean class defaults to the return type of the factory method:
从以下版本开始:
2.1.0

- 可选元素概要
  可选元素
  修饰符和类型可选元素说明
  Class<? extends javax.servlet.Filter>[] value
  The filter bean type that must not be present.

元素详细资料

value

@AliasFor(annotation=ConditionalOnMissingBean.class)
Class<? extends javax.servlet.Filter>[] value

The filter bean type that must not be present.

返回:: the bean type

默认值:: {}