SpringBoot-- 整合ServletFilterListener

Posted 2020-10-12 听歌敲代码

SpringBoot中有两种方式可以添加 Servlet、Filter、Listener。

1.代码注册，通过ServletRegistrationBean、 FilterRegistrationBean 和 ServletListenerRegistrationBean 获得控制

  1) Servlet

    @Bean 
    public ServletRegistrationBean servletRegistrationBean() { 
        return new ServletRegistrationBean(new MyServlet(), "/xs/*");
    }

2.在 SpringBootApplication 上使用@ServletComponentScan 注解后，Servlet、Filter、Listener 可以直接通过 @WebServlet(urlPatterns = "/test/*")、@WebFilter、@WebListener 注解自动注册,这些注解都是JDK的，无需其他代码。

  1) Servlet

    @SpringBootApplication 
    @ServletComponentScan(basePackages={"com.xsjt"})
    public class SpringBootSampleApplication { 
        public static void main(String[] args) { 
            SpringApplication.run(SpringBootSampleApplication.class, args); 
        } 
    }

  2) Filter

/** 
 * @Description 自定义的Serlvlet过滤器 
 * @ClassName   MyFilter 
 * @Date        2017年11月1日 下午2:29:50 
 */
@WebFilter(filterName = "myFilter", urlPatterns = "/*")
public class MyFilter implements Filter {
    
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
    }
    
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest)request;
        System.out.println(req.getRequestURL() + "------>doFilter");
        chain.doFilter(request, response);
    }
    
    public void destroy() {
        // TODO Auto-generated method stub
    }
}

  3) Listener

/** 
 * @Description 自定义监听器 
 * @ClassName   MyListener 
 * @Date        2017年11月1日 下午2:31:18 
 */
@WebListener
public class MyListener implements ServletContextListener {
    
    public void contextInitialized(ServletContextEvent sce) {
        System.out.println("ServletContext 初始化");
        System.out.println(sce.getServletContext().getServerInfo());
    }
    
    public void contextDestroyed(ServletContextEvent sce) {
        System.out.println("ServletContext 销毁");
    }
}