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
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| 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);
}
}
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2、Servlet
方式1：
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| @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");
}
}
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方式2：
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| @Bean
public ServletRegistrationBean servletRegistrationBean(){
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
servletRegistrationBean.addUrlMappings("/demo");
servletRegistrationBean.setServlet(new DemoServlet2());
return servletRegistrationBean;
}
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3、Listener
方式1：
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| @WebListener
public class TestListener implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println("contextInitialized");
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
}
}
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方式2：
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| @Bean
public ServletListenerRegistrationBean servletListenerRegistrationBean(){
ServletListenerRegistrationBean servletListenerRegistrationBean = new ServletListenerRegistrationBean();
servletListenerRegistrationBean.setListener(new Log4jConfigListener());
servletListenerRegistrationBean.addInitParameter("log4jConfigLocation","classpath:log4j.properties");
return servletListenerRegistrationBean;
}
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4、Filter
方式1：
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| @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() {
}
}
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方式2：
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| @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;
}
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