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
