package reggie.filter;

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import reggie.common.R;

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

/**
 * 通过过滤器实现: 检查用户是否登录
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    // 路径匹配器
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.info("拦截到请求。。。。。");
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 1. 获取本次请求的 URL
        String requestURL = request.getRequestURI();
        // 定义不需要处理的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "front/**"
        };

        // 2. 判断本次请求是否需要处理
        boolean check = check(urls, requestURL);

        // 3. 如果不需要处理 直接放行
        if(check){
            filterChain.doFilter(request, response);
            return ;
        }

        // 4. 判断登陆状态, 如果已经登录则直接放行
        if(request.getSession().getAttribute("employee") != null){
            filterChain.doFilter(request, response);
            return ;
        }

        // 5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return ;
    }

    public boolean check(String[] urls, String requestURI){
        for(String url : urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}

package reggie;

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
// 添加这个注释
@ServletComponentScan
public class ReggieApplication {
    public static void main(String[] args) {
        SpringApplication.run(ReggieApplication.class, args);
        log.info("项目正在启动....");
    }
}