package com.itheima.reggie.entity;
import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.TableField;
import lombok.Data;
import java.io.Serializable;
import java.time.LocalDateTime;
/**@Description: 員工實(shí)體類 該實(shí)體類主要用于和員工表 employee 進(jìn)行映射。
 * @version v1.0
 * @author LiBiGo
 * @date 2022/8/12 11:05
 */
// 在實(shí)體類上添加@Data注解，可以省去代碼中大量的 get()、 set()、 toString() 等方法，提高代碼的簡(jiǎn)潔：
@Data
public class Employee implements Serializable {
    private static final long serialVersionUID = 1L;
    private Long id;
    private String username;
    private String name;
    private String password;
    private String phone;
    private String sex;
    // map-underscore-to-camel-case: true
    // 在映射實(shí)體或者屬性時(shí)，將數(shù)據(jù)庫(kù)中表名和字段名中的下劃線去掉，按照駝峰命名法映射
    private String idNumber; //身份證 因?yàn)樵谂渲梦募性O(shè)置駝峰命名，所以與數(shù)據(jù)庫(kù)中的不太一樣，數(shù)據(jù)庫(kù)中為id_number
    private Integer status;
    @TableField(fill = FieldFill.INSERT) // 插入時(shí)填充該屬性值
    private LocalDateTime createTime; // 同上 駝峰命名法
    @TableField(fill = FieldFill.INSERT_UPDATE) //插入、更新時(shí)填充該屬性值
    private LocalDateTime updateTime;   // 同上 駝峰命名法
    @TableField(fill = FieldFill.INSERT)
    private Long createUser;
    @TableField(fill = FieldFill.INSERT_UPDATE) //插入和更新時(shí)填充
    private Long updateUser;
}

package com.itheima.reggie.common;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
/**
 * Description: 自定義元數(shù)據(jù)對(duì)象處理器|統(tǒng)一為公共字段賦值，此類需要實(shí)現(xiàn)MetaObjectHandler接口。
 * @author w
 * @version 1.0
 * @date 2022/8/15 12:05
 */
@Component
@Slf4j
public class MyMetaObjecthandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        /**@Description: 插入操作自動(dòng)填充
         * @version v1.0
         * @author LiBiGo
         * @date 2022/8/15 12:14
         */
        log.info("公共字段自動(dòng)填充insert...");
        log.info(metaObject.toString());
        metaObject.setValue("createTime", LocalDateTime.now());
        metaObject.setValue("updateTime", LocalDateTime.now());
        metaObject.setValue("createUser", BaseContext.getCurrentId()); // 使用了Thread 看后續(xù)
        metaObject.setValue("updateUser", BaseContext.getCurrentId());
    }
    @Override
    public void updateFill(MetaObject metaObject) {
        /**@Description: 更新操作自動(dòng)填充
         * @version v1.0
         * @author LiBiGo
         * @date 2022/8/15 12:14
         */
        log.info("公共字段自動(dòng)填充update...");
        log.info(metaObject.toString());
        long id = Thread.currentThread().getId();
        log.info("線程ID：{}",id);
        metaObject.setValue("updateTime", LocalDateTime.now());
        metaObject.setValue("updateUser", BaseContext.getCurrentId());
    }
}

long id = Thread.currentThread().getId();
log.info("線程id為：{}",id);

package com.itheima.reggie.common;
/**
 * Description: 基于ThreadLocal封裝工具類，用戶保存和獲取當(dāng)前登陸用戶ID
 * @date 2022/8/15 12:40
 */
public class BaseContext {
    private static ThreadLocal<Long> threadLocal = new ThreadLocal<>();
    /**
     * 設(shè)置值
     * @param id
     */
    public static void setCurrentId(Long id){
        threadLocal.set(id);
    }
    /**
     * 獲取值
     * @return
     */
    public static Long getCurrentId(){
        return threadLocal.get();
    }
}

package com.itheima.reggie.filter;
import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
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;
/**
 * Description: 檢查用戶是否已經(jīng)完成登陸
 */
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")  //設(shè)置攔截器，設(shè)置攔截的網(wǎng)頁區(qū)域
@Slf4j
public class LoginCheckFilter implements Filter {
    // 路徑匹配器，支持通配符，因?yàn)橄旅娴男蛄惺褂昧送ㄅ浞?
    // AntPathMatcher匹配規(guī)則  ? 匹配一個(gè)字符    * 匹配0個(gè)或多個(gè)字符   ** 匹配0個(gè)或多個(gè)目錄/字符
    public static final AntPathMatcher 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;
        //  A. 獲取本次請(qǐng)求的URI
        String requestURI = request.getRequestURI();
        log.info("攔截的請(qǐng)求：{}",requestURI);
        // 定義不攔截的序列，只攔截頁面數(shù)據(jù)請(qǐng)求，不攔截頁面格式
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };
        //  B. 判斷本次請(qǐng)求, 是否需要登錄, 才可以訪問
        boolean check = check(urls, requestURI);
        //  C. 如果不需要，則直接放行
        if(check){
            log.info("本次請(qǐng)求{}不需要處理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //  D. 判斷登錄狀態(tài)，如果已登錄，則直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用戶已登錄，用戶id為：{}",request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee"); // 獲取當(dāng)前用戶登陸id
            BaseContext.setCurrentId(empId); //設(shè)置線程共享
            filterChain.doFilter(request,response); // 補(bǔ)課 不清楚？？？？？？？？？？？？
            long id = Thread.currentThread().getId();
            log.info("檢測(cè)是否登陸線程ID：{}",id);
            return;
        }
        //  E. 如果未登錄, 則返回未登錄結(jié)果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    public boolean check(String[] urls,String requestURI){
        /**@Description: 路徑匹配，檢查本次請(qǐng)求是否需要放行
         * @author LiBiGo
         * @date 2022/8/12 16:50
         */
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI); // 使用通配符對(duì)象，配對(duì)資源
            if(match){
                return true;
            }
        }
        return false;
    }
}