SpringBoot 中filter在web容器中执行的顺序

1、调用 ServletWebServerApplicationContext.onStartup

 

 2、获取所有的 ServletContextInitializer

 

 3、initializers => 未排序的 Filter

 

4、sortedList => 排完序的Filter

5、实际循环的是排序后的Filter (sortedList)

 

 误区：logMappings 打印的是initializers（非实际序列运行的Filter）

及开启web日志，出现【Mapping filters】开头的日志

logging:
  level:
    web: debug

2022-05-09 01:54:15.149 DEBUG [main] servlet.ServletContextInitializerBeans - Mapping filters: filterRegistrationBean urls=[/*] order=-2147483647, corsFilter urls=[/*] order=0, characterEncodingFilter urls=[/*] order=-2147483648, formContentFilter urls=[/*] order=-9900, requestContextFilter urls=[/*] order=-105, shiroFilter urls=[/*] order=2147483647
2022-05-09 01:54:15.149 DEBUG [main] servlet.ServletContextInitializerBeans - Mapping servlets: dispatcherServlet urls=[/]