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1 配置webfilter注解，设置要拦截处理的路径，先设置全部路径，后面分析放行就行

@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")

  2 编写filter,拦截器类，编写拦截的的逻辑代码

package com.itheima.reggie_take_out.filter;import com.alibaba.fastjson.JSON;
import com.itheima.reggie_take_out.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import javax.servlet.*;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.logging.LogRecord;@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {//路径匹配器public  static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws ServletException, IOException {HttpServletRequest request=(HttpServletRequest) servletRequest;HttpServletResponse response=(HttpServletResponse) servletResponse;String requestURI=request.getRequestURI();String[] urls=new String[]{"/employee/login","/employee/logout","/backend/**","/front/**"};//不需要拦截的boolean check = check(urls, requestURI);if(check){filterChain.doFilter(request,response);log.info("请求不需要处理；{}",request.getRequestURI());return;}if(request.getSession().getAttribute("employee")!=null){filterChain.doFilter(request,response);log.info("已登录，用户ID；{}",request.getSession().getAttribute("employee"));return;}response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));log.info("拦截请求；{}",request.getRequestURI());return;}//路径匹配public boolean check(String[] urls,String requestURI){for(String url:urls){boolean match= PATH_MATCHER.match(url,requestURI);if(match){return true;}}return false;}}

3 在启动类上组件扫描

@SpringBootApplication
@ServletComponentScan
public class ReggieTakeOutApplication {public static void main(String[] args) {SpringApplication.run(ReggieTakeOutApplication.class, args);log.info("项目启动");}}