由于Spring Boot默認是以jar包的形式啟動嵌入式的Servlet容器來啟動Spring Boot的web應用是，沒有web.xml配置文件
注冊三大組件用以下方式

ServletRegistrationBean
FilterRegistrationBean
ServletListenerRegistrationBean

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一、注冊一個ServletRegistrationBean

1.定義一個Servlet類

//向頁面輸出一句hello public class HttpServlet extends javax.servlet.http.HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.getWriter().write("hello");}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request,response);} }

2.編寫一個Servlet配置類

@Configuration public class MyServerConfig {//注冊三大組件//注意加上@Bean注解，否者無法加入到容器中@Beanpublic ServletRegistrationBean myServlet(){ServletRegistrationBean servlet = new ServletRegistrationBean(new HttpServlet(), "/myServlet");return servlet;}

3.Spring Boot配置文件

server.port=8081 server.servlet.context-path=/boot server.tomcat.uri-encoding=UTF-8

4.啟動主配置文件訪問http://localhost:8081/boot/myServlet

這樣就生效了

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二、注冊一個FilterRegistrationBean

1.定義一個Filter類

public class MyFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {System.out.println("success");filterChain.doFilter(servletRequest,servletResponse);}@Overridepublic void destroy() {} }

2.編寫一個filter配置類

@Configuration public class MyServerConfig {//注冊三大組件@Beanpublic FilterRegistrationBean filterRegistrationBean(){FilterRegistrationBean re = new FilterRegistrationBean();re.setFilter(new MyFilter());re.setUrlPatterns(Arrays.asList("/hello","/filter"));return re;}

3.啟動訪問http://localhost:8081/boot/filter

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ServletListenerRegistrationBean的使用類似于以上兩種組件

Spring Boot 幫我們自動注冊了SpringMVC的核心控制器DispatcherServlet，其注冊方式類似于以上兩種注冊

總結

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