Filter练习代码

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Filter练习代码

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package com.xiaoguan.test;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
@WebServlet("/a.do")
public class AServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("AServlet执行了");
    }
}

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package com.xiaoguan.test;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
@WebServlet("/b.do")
public class BServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("BServlet执行了");
    }
}

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package com.xiaoguan.test;

import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;

import java.io.IOException;
@WebFilter({"*.do","/abc"})
public class Filter implements jakarta.servlet.Filter {
    public Filter() {
        System.out.println("无参数构造方法执行了");
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println(filterConfig.getFilterName());
        System.out.println("初始化执行了");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("doFilter开始执行了");
        chain.doFilter(request,response);
        System.out.println("doFilter执行结束");
    }

    @Override
    public void destroy() {
        System.out.println("destory执行了");
    }
}

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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_6_0.xsd"
         version="6.0">
    <filter>
        <filter-name>Gilter</filter-name>
        <filter-class>com.xiaoguan.test.Filter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>Gilter</filter-name>
        <url-pattern>/b.do</url-pattern>
    </filter-mapping>
</web-app>