1、添加注解支持

以下方式1中的方法，均需要向springboot的入口类添加注解@ServletComponentScan。添加该注解以后，以下注解才会生效：@WebServlet 、@WebListener、@WebFilter

package com.wxtx;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@ServletComponentScan
@SpringBootApplication
public class TXSpringBootApplication {
	public static void main(String[] args) {
		SpringApplication.run(TXSpringBootApplication.class, args);
	}
}

2、Servlet

@WebServlet(name="testServlet",urlPatterns="/testServlet")
public class TestServlet extends HttpServlet {

@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		resp.getWriter().write("hello world");
	}
}

@Bean
public ServletRegistrationBean servletRegistrationBean(){
    ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
    servletRegistrationBean.addUrlMappings("/demo");
    servletRegistrationBean.setServlet(new DemoServlet2());
    return servletRegistrationBean;
}

3、Listener

@WebListener
public class TestListener implements ServletContextListener {

@Override
	public void contextInitialized(ServletContextEvent sce) {
		System.out.println("contextInitialized");
	}

@Override
	public void contextDestroyed(ServletContextEvent sce) {
	}

}

@Bean
public ServletListenerRegistrationBean servletListenerRegistrationBean(){
    ServletListenerRegistrationBean servletListenerRegistrationBean =  new ServletListenerRegistrationBean();
    servletListenerRegistrationBean.setListener(new Log4jConfigListener());
    servletListenerRegistrationBean.addInitParameter("log4jConfigLocation","classpath:log4j.properties");
    return servletListenerRegistrationBean;
}

4、Filter

@WebFilter(urlPatterns="/*")
public class TestFilter implements Filter {

@Override
	public void init(FilterConfig filterConfig) throws ServletException {
	}

@Override
	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		System.out.println(request.getRemoteAddr());
		chain.doFilter(req, resp);
	}

@Override
	public void destroy() {
	}
}

@Bean
public FilterRegistrationBean filterRegistrationBean(){
    FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
    filterRegistrationBean.setFilter(new OpenSessionInViewFilter());
    Set<String> set = new HashSet<String>();
    set.add("/");
    filterRegistrationBean.setUrlPatterns(set);
    return filterRegistrationBean;
}