package com.shlb.timescaledbutils.utils;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.data.redis.core.StringRedisTemplate;
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import org.springframework.stereotype.Component;
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import java.util.concurrent.TimeUnit;
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@Component
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public class RedisUtils {
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@Autowired
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private StringRedisTemplate stringRedisTemplate;
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/**
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* 写入缓存
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*
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* @param key 键
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* @param value 值
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* @return true成功 false失败
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*/
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public boolean set(String key, String value) {
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try {
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stringRedisTemplate.opsForValue().set(key, value);
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 写入缓存并设置过期时间
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*
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* @param key 键
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* @param value 值
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* @param time 时间(秒) time要大于0 如果time小于等于0 将设置无限期
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* @return true成功 false失败
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*/
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public boolean set(String key, String value, long time) {
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try {
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if (time > 0) {
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stringRedisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
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} else {
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set(key, value);
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}
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 读取缓存
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*
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* @param key 键
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* @return 值
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*/
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public String get(String key) {
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return key == null ? null : stringRedisTemplate.opsForValue().get(key);
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}
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/**
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* 删除缓存
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*
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* @param key 键
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*/
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public boolean del(String key) {
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try {
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if (key != null && key.length() > 0) {
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stringRedisTemplate.delete(key);
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}
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 指定缓存失效时间
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*
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* @param key 键
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* @param time 时间(秒)
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* @return true成功 false失败
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*/
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public boolean expire(String key, long time) {
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try {
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if (time > 0) {
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stringRedisTemplate.expire(key, time, TimeUnit.SECONDS);
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}
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 判断key是否存在
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*
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* @param key 键
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* @return true 存在 false不存在
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*/
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public boolean hasKey(String key) {
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try {
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return Boolean.TRUE.equals(stringRedisTemplate.hasKey(key));
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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}
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