springboot添加对listener,servlet,filter的支持

比较常用的方式就是使用注解来添加对 监听器，过滤器，servlet的支持。

1.首先在启动类上添加  @ServletComponentScan  开启 对监听器，过滤器，servlet的注解扫描。

分别创建过滤器，拦截器，servlet

package com.example.demo.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.annotation.WebFilter;

@WebFilter(urlPatterns= {"/*"})

public class MyFilter implements Filter {

	@Override

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

			throws IOException, ServletException {

		System.out.println("my filter....");

		chain.doFilter(request, response);

	}

}

　　

package com.example.demo.listener;

import javax.servlet.annotation.WebListener;

import javax.servlet.http.HttpSessionEvent;

import javax.servlet.http.HttpSessionListener;

@WebListener(value="MySessionListener")

public class MySessionListener implements HttpSessionListener {

	@Override

	public void sessionCreated(HttpSessionEvent se) {

		HttpSessionListener.super.sessionCreated(se);

		System.out.println("session create...");

	}

	@Override

	public void sessionDestroyed(HttpSessionEvent se) {

		HttpSessionListener.super.sessionDestroyed(se);

	}

}

　　

package com.example.demo.servlet;

import java.io.IOException;

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(urlPatterns="/my1",name="my1")

public class MyServlet extends HttpServlet {

	private static final long serialVersionUID = 4322324790077226450L;

	@Override

	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

		System.out.println("MyServlet.....");

		req.getSession().setAttribute("aa", "bb");

	}

	@Override

	protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

		super.doPut(req, resp);

	}

}

　　访问servlet结果如下：

my filter....
MyServlet.....
session create...