Springboot公共字段填充及ThreadLocal模块改进方案

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: 员工实体类 该实体类主要用于和员工表 employee 进行映射。
 * @version v1.0
 * @author LiBiGo
 * @date 2022/8/12 11:05
 */
// 在实体类上添加@Data注解，可以省去代码中大量的 get()、 set()、 toString() 等方法，提高代码的简洁：
@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
    // 在映射实体或者属性时，将数据库中表名和字段名中的下划线去掉，按照驼峰命名法映射
    private String idNumber; //身份证 因为在配置文件中设置驼峰命名，所以与数据库中的不太一样，数据库中为id_number
    private Integer status;
    @TableField(fill = FieldFill.INSERT) // 插入时填充该属性值
    private LocalDateTime createTime; // 同上 驼峰命名法
    @TableField(fill = FieldFill.INSERT_UPDATE) //插入、更新时填充该属性值
    private LocalDateTime updateTime;   // 同上 驼峰命名法
    @TableField(fill = FieldFill.INSERT)
    private Long createUser;
    @TableField(fill = FieldFill.INSERT_UPDATE) //插入和更新时填充
    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: 自定义元数据对象处理器|统一为公共字段赋值，此类需要实现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: 插入操作自动填充
         * @version v1.0
         * @author LiBiGo
         * @date 2022/8/15 12:14
         */
        log.info("公共字段自动填充insert...");
        log.info(metaObject.toString());
        metaObject.setValue("createTime", LocalDateTime.now());
        metaObject.setValue("updateTime", LocalDateTime.now());
        metaObject.setValue("createUser", BaseContext.getCurrentId()); // 使用了Thread 看后续
        metaObject.setValue("updateUser", BaseContext.getCurrentId());
    }
    @Override
    public void updateFill(MetaObject metaObject) {
        /**@Description: 更新操作自动填充
         * @version v1.0
         * @author LiBiGo
         * @date 2022/8/15 12:14
         */
        log.info("公共字段自动填充update...");
        log.info(metaObject.toString());
        long id = Thread.currentThread().getId();
        log.info("线程ID：{}",id);
        metaObject.setValue("updateTime", LocalDateTime.now());
        metaObject.setValue("updateUser", BaseContext.getCurrentId());
    }
}

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

package com.itheima.reggie.common;
/**
 * Description: 基于ThreadLocal封装工具类，用户保存和获取当前登陆用户ID
 * @date 2022/8/15 12:40
 */
public class BaseContext {
    private static ThreadLocal<Long> threadLocal = new ThreadLocal<>();
    /**
     * 设置值
     * @param id
     */
    public static void setCurrentId(Long id){
        threadLocal.set(id);
    }
    /**
     * 获取值
     * @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: 检查用户是否已经完成登陆
 */
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")  //设置拦截器，设置拦截的网页区域
@Slf4j
public class LoginCheckFilter implements Filter {
    // 路径匹配器，支持通配符，因为下面的序列使用了通配符
    // AntPathMatcher匹配规则  ? 匹配一个字符    * 匹配0个或多个字符   ** 匹配0个或多个目录/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. 获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截的请求：{}",requestURI);
        // 定义不拦截的序列，只拦截页面数据请求，不拦截页面格式
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };
        //  B. 判断本次请求, 是否需要登录, 才可以访问
        boolean check = check(urls, requestURI);
        //  C. 如果不需要，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //  D. 判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee"); // 获取当前用户登陆id
            BaseContext.setCurrentId(empId); //设置线程共享
            filterChain.doFilter(request,response); // 补课 不清楚？？？？？？？？？？？？
            long id = Thread.currentThread().getId();
            log.info("检测是否登陆线程ID：{}",id);
            return;
        }
        //  E. 如果未登录, 则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    public boolean check(String[] urls,String requestURI){
        /**@Description: 路径匹配，检查本次请求是否需要放行
         * @author LiBiGo
         * @date 2022/8/12 16:50
         */
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI); // 使用通配符对象，配对资源
            if(match){
                return true;
            }
        }
        return false;
    }
}