[十三]SpringBoot 之过滤器（Filter）和监听器（Listener）-优快云博客

本文介绍了如何在Java Web应用中使用过滤器(Filter)和监听器(Listener)，并通过示例展示了MyFilter过滤器及MyHttpSessionListener和MyServletContextListener监听器的实现方式。

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过滤器（Filter）和监听器（Listener）的注册方法和 Servlet 一样，不清楚的可以查看下上一篇文章

代码示例

package me.shijunjie.filter;

import java.io.IOException;

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(filterName="myFilter",urlPatterns="/*")
public class MyFilter implements Filter {

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        System.out.println("MyFilter init");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        System.out.println("MyFilter doFilter");
        chain.doFilter(request, response);
    }
    
    @Override
    public void destroy() {
        System.out.println("MyFilter destroy");
    }
}

package me.shijunjie.listener;

import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

@WebListener
public class MyHttpSessionListener implements HttpSessionListener {

    @Override
    public void sessionCreated(HttpSessionEvent arg0) {
         System.out.println("MyHttpSessionListener sessionCreated");
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent arg0) {
        System.out.println("MyHttpSessionListener sessionDestroyed");
    }

}

package me.shijunjie.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

@WebListener
public class MyServletContextListener implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        System.out.println("ServletContex contextInitialized");
    }

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
         System.out.println("ServletContex contextDestroyed");
    }



}

package me.shijunjie.testspringboot2;

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

/**
 * Hello world!
 *
 */
@SpringBootApplication
@ServletComponentScan("me.shijunjie")
public class App 
{
    
    /* *//**
     * 注册Servlet.不需要添加注解：@ServletComponentScan
     * @return
     *//*
    @Bean
    public ServletRegistrationBean myServlet1(){

           return new ServletRegistrationBean(new MyServlet1(),"/myServlet/*");
    }*/
    
    public static void main( String[] args )
    {
        SpringApplication.run(App.class, args);
    }
}