在SpringBoot中使用 Servlet Filter Listener

待我称王封你为后i 2022-07-12 09:58 217阅读 0赞

**在SpringBoot中使用Servlet**

MyServlet.java

import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @WebServlet("/my/*") // Servlet 3.0 的注解
    public class MyServlet extends HttpServlet { 
    
        private static final long serialVersionUID = 1L;
    
        protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException{
    
            resp.getWriter().print("my servlet");
        }
    }

在启动类上添加注解：@ServletComponentScan

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

![这里写图片描述][SouthEast]

在SpringBoot中使用Filter

@WebFilter(“/\*”)

import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.annotation.WebFilter;
    
    @WebFilter("/*") // 比如拦截所有请求
    public class LogFilter implements Filter { 
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
    
        }
    
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                throws IOException, ServletException {
            System.out.println("log filter --->:" + request.getRemoteHost());
            chain.doFilter(request, response);
        }
    
        @Override
        public void destroy() {
    
        }
    
    }

在SpringBoot中使用Listener

@WebListener

import javax.servlet.ServletContextEvent;
    import javax.servlet.ServletContextListener;
    import javax.servlet.annotation.WebListener;
    
    /** * 监听应用的启动或者停止 * * @author Administrator * */
    @WebListener
    public class MyContextListener implements ServletContextListener { 
    
        @Override
        public void contextInitialized(ServletContextEvent sce) {
            System.out.println("application startting....");
        }
    
        @Override
        public void contextDestroyed(ServletContextEvent sce) {
        }
    
    }

亦可参考：[http://blog.csdn.net/catoop/article/details/50501686][http_blog.csdn.net_catoop_article_details_50501686]

[SouthEast]: /images/20220710/594d2096202a4f52a7314896a5236186.png
[http_blog.csdn.net_catoop_article_details_50501686]: http://blog.csdn.net/catoop/article/details/50501686