手撕JAVA（二十二）SpringBoot与Web三大组件

迷南。 2023-10-18 22:53 22阅读 0赞

servlet、filter、listener三大组件。

由于SpringBoot是以jar包的方式启动嵌入式的Servlet容器来启动SpringBoot的web应用。

没有web.xml,所以要使用注解来添加组件，分为两步：

1.自定义组件

2.通过RegistrationBean注册

**↑****SpringBoot****就是通过这种方式向****IOC****中注册的****dispatchServlet**

备注：通过RegistrationBean的set、get、add方法，可以对三大组件进行配置，如filter的拦截路径、servlet的映射路径等等属性。

## Servlet ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0pva2VyX1pKTg_size_16_color_FFFFFF_t_70][]

![20190804205643531.png][]

## filter ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0pva2VyX1pKTg_size_16_color_FFFFFF_t_70 1][]

![20190804205610787.png][]

## listener ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0pva2VyX1pKTg_size_16_color_FFFFFF_t_70 2][]

![20190804205719957.png][]

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[20190804205643531.png]: https://img-blog.csdnimg.cn/20190804205643531.png
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[20190804205610787.png]: https://img-blog.csdnimg.cn/20190804205610787.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0pva2VyX1pKTg_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/2019080420571085.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0pva2VyX1pKTg==,size_16,color_FFFFFF,t_70
[20190804205719957.png]: https://img-blog.csdnimg.cn/20190804205719957.png