一.如何定制和修改Servlet容器的相关配置

修改和server有关的配置（ServerProperties）；

server.port=8081

server.context‐path=/tx

server.tomcat.uri‐encoding=UTF‐8

在yml配置文件的写法：

server:port: 8081servlet:context-path: /tx

二.注册Servlet三大组件【Servlet、Filter、Listener】

由于SpringBoot默认是以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文件。

1.servlet

//注册三大组件

@Bean

public ServletRegistrationBean myServlet(){

ServletRegistrationBean registrationBean = new ServletRegistrationBean(new

MyServlet(),"/myServlet");

return registrationBean;

}

2.FilterRegistrationBean

@Bean

public FilterRegistrationBean myFilter(){

FilterRegistrationBean registrationBean = new FilterRegistrationBean();

registrationBean.setFilter(new MyFilter());

registrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet"));

return registrationBean;

}

3.ServletListenerRegistrationBean

@Bean

public ServletListenerRegistrationBean myListener(){

ServletListenerRegistrationBean<MyListener> registrationBean = new

ServletListenerRegistrationBean<>(new MyListener());

return registrationBean;

}

SpringBoot帮我们自动SpringMVC的时候，自动的注册SpringMVC的前端控制器；DispatcherServlet；

DispatcherServletAutoConfiguration中：

@Bean(name = DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME)

@ConditionalOnBean(value = DispatcherServlet.class, name =

DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)

public ServletRegistrationBean dispatcherServletRegistration(

DispatcherServlet dispatcherServlet) {

ServletRegistrationBean registration = new ServletRegistrationBean(

dispatcherServlet, this.serverProperties.getServletMapping());

//默认拦截： / 所有请求；包静态资源，但是不拦截jsp请求； /*会拦截jsp

//可以通过server.servletPath来修改SpringMVC前端控制器默认拦截的请求路径

registration.setName(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);

registration.setLoadOnStartup(

this.webMvcProperties.getServlet().getLoadOnStartup());

if (this.multipartConfig != null) {

registration.setMultipartConfig(this.multipartConfig);

}

return registration;

}