SpringBoot整合Filter过滤器

话不多说，直接上核心代码

1、先创建一个Filter类

package com.qbb.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.qbb.reggie.common.R;
import com.qbb.reggie.properties.AuthProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

/**
 * @author QIUQIU&LL (个人博客:https://www.cnblogs.com/qbbit)
 * @version 1.0
 * @date 2022-08-07  22:26
 * @Description:
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    @Autowired
    private AuthProperties authProperties;

    /**
     * 路径检验
     */
    public static final AntPathMatcher ANT_PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        // 获取请求的URI
        String requestURI = request.getRequestURI();
        // 判断请求是否需要登录
        List<String> authurls = authProperties.getAnyoneurls();
        // 校验请求路径
        boolean check = check(authurls, requestURI);
        if (check) {
            // 非受保护资源
            filterChain.doFilter(request, response);
            return;
        }
        Object employee = request.getSession().getAttribute("employee");
        if (employee != null) {
            // 已登录放行
            filterChain.doFilter(request, response);
            return;
        }
        // 未登录
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配,检查下次请求是否需要
     *
     * @param urls
     * @param requestURI
     * @return
     */
    private boolean check(List<String> urls, String requestURI) {
        for (String url : urls) {
            boolean match = ANT_PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}

2、配置文件信息

app:
  auth:
    anyoneurls:
      # 需要登录才能访问的资源
      - /employee/login
      - /employee/logout
      - /backend/**
      - /front/**

3、主启动类上加注解

@ServletComponentScan // 开启servlet注解扫描