瑞吉外卖实战学习--登录过滤器和判断是否登录过

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1、创建自定义过滤器LoginCheckFiler

1.1通过@WebFilter创建过滤器

1.2 验证是否可以拦截请求

1.3 代码

package com.example.ruiji_demo;import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;@Slf4j
@SpringBootApplication
@ServletComponentScan
public class RuijiDemoApplication {public static void main(String[] args) {SpringApplication.run(RuijiDemoApplication.class, args);log.info("项目启动成功");}}

2、在启动类加入注解@ServletComponentScan 用来扫描过滤器

触发所有的过滤器@ServletComponentScan

3、完善过滤器的处理逻辑

3.1判断是否需要是要放行的请求

3.2判断用户是否登录

3.3如果没有登录返回请求体并携带msg信息

package com.example.ruiji_demo.filter;import com.alibaba.fastjson2.JSON;
import com.example.ruiji_demo.common.R;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;import java.io.IOException;
import java.util.logging.LogRecord;/*** @author jitwxs* @date 2024年03月25日 22:24*/
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
//    路径匹配器,支持通配符public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) servletRequest;HttpServletResponse response = (HttpServletResponse) servletResponse;//        1、获取本次请求的urlString requestUrl = request.getRequestURI();
//        2、定义不需要处理的路径String[] urls = new String[]{"/employee/login","/employee/logout","/backeed/**","/front/**"};
//        3、判断本次请求是否需要处理,调用匹配路径boolean check =  check(urls,requestUrl);//        4.检测路径是否需要筛选如果不需要筛选直接放行if(check){filterChain.doFilter(request,response);return;}
//        5.判断是否登录过if(request.getSession().getAttribute("employee") != null){filterChain.doFilter(request,response);return;}//        6.如果没有登录过,通过输出流方向客户端页面响应数据response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));return;}/*** 匹配路径,检查本次请求是否需要放行* @param urls* @param requestUrl* @return*/public boolean check(String[] urls,String requestUrl){for(String url:urls){boolean match = PATH_MATCHER.match(url,requestUrl);log.info("match:{}",match);if(match){return true;}}return false;}
}

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