黑马点评Redis笔记

黑马点评Redis笔记

Redis基础篇：https://cyborg2077.github.io/2022/10/21/RedisBasic/
Redis实战篇：https://cyborg2077.github.io/2022/10/22/RedisPractice/

一、手机号+验证码注册登录

RandomUtil

生成定长随机数列

String code = RandomUtil.randomNumbers(6);

返回类型约定

public class Result {private Boolean success;private String errorMsg;private Object data;private Long total;public static Result ok(){return new Result(true, null, null, null);}public static Result ok(Object data){return new Result(true, null, data, null);}public static Result ok(List<?> data, Long total){return new Result(true, null, data, total);}public static Result fail(String errorMsg){return new Result(false, errorMsg, null, null);}
}

正则类

校验手机号

RegexUtils.isPhoneInvalid(phone);

public class RegexUtils {/*** 是否是无效手机格式* @param phone 要校验的手机号* @return true:符合，false：不符合*/public static boolean isPhoneInvalid(String phone){return mismatch(phone, RegexPatterns.PHONE_REGEX);}/*** 是否是无效邮箱格式* @param email 要校验的邮箱* @return true:符合，false：不符合*/public static boolean isEmailInvalid(String email){return mismatch(email, RegexPatterns.EMAIL_REGEX);}/*** 是否是无效验证码格式* @param code 要校验的验证码* @return true:符合，false：不符合*/public static boolean isCodeInvalid(String code){return mismatch(code, RegexPatterns.VERIFY_CODE_REGEX);}// 校验是否不符合正则格式private static boolean mismatch(String str, String regex){if (StrUtil.isBlank(str)) {return true;}return !str.matches(regex);}
}

ThreadLocal工具类

public class UserHolder {private static final ThreadLocal<UserDTO> tl = new ThreadLocal<>();public static void saveUser(UserDTO user){tl.set(user);}public static UserDTO getUser(){return tl.get();}public static void removeUser(){tl.remove();}
}

BeanUtil使用

属性拷贝BeanUtil.copyProperties

UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);

对象转哈希BeanUtil.beanToMap

Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),CopyOptions.create().setIgnoreNullValue(true).setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));

随机生成token

String token = UUID.randomUUID().toString(true);

Redis存登录信息

String tokenKey = LOGIN_USER_KEY + token;
stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
// 7.4.设置token有效期
stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);

二、缓存

字符串工具StrUtil

StrUtil.isNotBlank(shopJson)

Json工具JSONUtil

Json字符串转对象

String shopJson = stringRedisTemplate.opsForValue().get(key);
Shop shop = JSONUtil.toBean(shopJson, Shop.class);

对象转Json字符串

JSONUtil.toJsonStr(shop)

缓存穿透

缓存雪崩

缓存击穿