SpringBoot获取当前操作用户的id/信息

一、概述

　　在一般性的基设需求中，有需要获取当前用户操作记录的情况，也就是说我们需要记录当前用户的信息。如：id、昵称、账号等信息。

　　这些信息一般用于记录用户的个人行为，例如：用户的操作日志，记录某些数据的更改或者添加者信息等。

　　本例主要用于记录更改及添加者信息（操作数据库时）

　　我希望借助mybatis的默认插件：MetaObjectHandler类实现公共字段的插入和更改，如：创建者、更新者、创建时间、更新时间、删除状态等。

　　　　 this.strictInsertFill(metaObject, "createUser", Long.class, memberId);
        this.strictInsertFill(metaObject, "updateUser", Long.class, memberId);
        this.strictInsertFill(metaObject, "updateTime", Date.class, date);
        this.strictInsertFill(metaObject, "createTime", Date.class, date);
        this.strictInsertFill(metaObject, "deleted", Integer.class, 0);

　　技术：SpringBoot+ThreadLocal+Redis。其中ThreadLocal用于存储当前线程的用户信息，redis用于存储登录用户信息，如：根据token获取用户信息，然后再把用户信息存入ThreadLocl

二、代码示例

　　1.首先定义一个过滤器，用于获取请求的token，然后根据token获取响应的用户信息，获取到用户信息后把用户信息存储的WebContextHolder中（ps：此类是一个封装了ThreadLocal的类）

@Slf4j
@Component
@Order(Ordered.HIGHEST_PRECEDENCE + 1)
public class WebContextHolderFilter extends GenericFilterBean {
    @Autowired
    RedisUtil<AdminUserResponse> redisUtil;

    @Override
    @SneakyThrows
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        try {
            String token = request.getHeader("Authorization");
            log.info("token:{}",token);
            if (token != null&&!"undefined".equals(token)) {
                AdminUserResponse adminUserResponse = redisUtil.getValue(token);
                WebContextHolder.setMemberId(adminUserResponse.getUserId());
                log.error("用户id:{}", adminUserResponse.getUserId());
            }
            filterChain.doFilter(request, response);

        } finally {
            WebContextHolder.clear();
        }
    }
}

　　2.创建一个ThreadLocal用于存储用户id

public class WebContextHolder {private static final ThreadLocal<Long> THREAD_LOCAL_MEMBER = new ThreadLocal<>();
public static void setMemberId(Long memberId) {
        THREAD_LOCAL_MEMBER.set(memberId);
    }

    public static Long getMemberId() {
        return THREAD_LOCAL_MEMBER.get();
    }
public static void clear() {
        THREAD_LOCAL_MEMBER.remove();
    }
}

　　3.在MetaObjectHandler类中使用memberId

@Slf4j
@Component
public class MyBatisMetaObjectHandler implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        Long memberId = WebContextHolder.getMemberId();
        log.info("memberId:{}",memberId);//用户id
        Date date = new Date();
        this.strictInsertFill(metaObject, "createUser", Long.class, memberId);
        this.strictInsertFill(metaObject, "updateUser", Long.class, memberId);
        this.strictInsertFill(metaObject, "updateTime", Date.class, date);
        this.strictInsertFill(metaObject, "createTime", Date.class, date);
        this.strictInsertFill(metaObject, "deleted", Integer.class, 0);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.strictInsertFill(metaObject, "updateUser", Long.class, WebContextHolder.getMemberId());
        this.strictInsertFill(metaObject, "updateTime", Date.class, new Date());
    }
}