spring boot——请求与参数校验——重要概念——Filter——过滤器——华章

Filter过滤器及其作用介绍

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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https://blog.csdn.net/pingyufeng/article/details/127550532

 

 

【Springboot | 过滤器】配置类和注解两种方式

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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FirstFilter

 

package org.example.webFilter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

@WebFilter(filterName = "FirstFilter", urlPatterns = "/*")
public class FirstFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("FirstFilter正在执行doFilter");
        chain.doFilter(request, response);//放行
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("FirstFilter正在执行init");
    }

    @Override
    public void destroy() {
        System.out.println("FirstFilter正在执行destroy");
    }
}

 

 

 

 

 

 

 

 

SecondFilter

package org.example.webFilter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

@WebFilter(filterName = "secondFilter", urlPatterns = "/*")
public class SecondFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("SecondFilter正在执行doFilter");
        chain.doFilter(request, response);//放行
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("SecondFilter正在执行init");
    }

    @Override
    public void destroy() {
        System.out.println("SecondFilter正在执行destroy");
    }
}

 

 

 

 

 

 

 

 

package org.example;

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


@SpringBootApplication
@ServletComponentScan("org.example.webFilter")
public class HelloWorldApplication
{

    public static void main(String[] args)
    {

        SpringApplication.run(HelloWorldApplication.class, args);

    }
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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