招聘网站建设工作汇报搜索引擎营销的名词解释

在Filter内书写登录校验, 就可以不用再服务器内部的各个功能内书写了

实现接口后可以直接快捷方式生成下面的三个方法

package com.itheima.filter;import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.util.StringUtil;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.StringUtils;import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@Slf4j
@WebFilter(urlPatterns = "/*")
public class LoginCheckFilter implements Filter {@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest req = (HttpServletRequest) servletRequest;HttpServletResponse resp = (HttpServletResponse) servletResponse;//1.获取请求urlString url = req.getRequestURL().toString();log.info("请求的url: {}",url);//2.判断请求url中是否包含login, 如果包含, 说明是登陆操作, 放行if (url.contains("login")){log.info("登陆操作, 直接放行...");filterChain.doFilter(servletRequest, servletResponse);return;}//3.获取请求头中的令牌(token)String jwt = req.getHeader("token");//4.判断令牌是否存在, 如果不存在, 返回错误的结果(未登记)if (!StringUtils.hasLength(jwt)){//hasLength 判断一个字符串是否有长度log.info("请求头token为空, 返回未登陆的信息");Result error = Result.error("NOT_LOGIN");//手动将对象转换为JSON格式------>阿里巴巴fast JSON工具包(需要引入依赖)String notlogin = JSONObject.toJSONString(error);resp.getWriter().write(notlogin);return;}//5.解析token, 如果解析失败, 返回错误结果(未登记)try {JwtUtils.parseJWT(jwt);} catch (Exception e) {e.printStackTrace();log.info("解析令牌失败, 返回未登录错误信息");Result error = Result.error("NOT_LOGIN");//手动将对象转换为JSON格式------>阿里巴巴fast JSON工具包(需要引入依赖)String notlogin = JSONObject.toJSONString(error);resp.getWriter().write(notlogin);return;}//6.放行log.info("令牌合法, 放行");filterChain.doFilter(servletRequest, servletResponse);}
}