配置文件：bootstrap-dev.yml
redis:
database: 0
host: iac-redis-dev-tech.ikunchi.com
port: 30038
password:
timeout: 60000ms
jedis:
pool:
# 连接池最大阻塞等待时间（使用负值表示没有限制）
max-wait: -1ms
# 连接池最大连接数（使用负值表示没有限制）
max-active: -1
RedisConfig.java
@Configuration
public class RedisConfig {
@Bean
@SuppressWarnings("all")
public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
template.setConnectionFactory(factory);
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
ObjectMapper om = new ObjectMapper();
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(om);
StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
// key采用String的序列化方式
template.setKeySerializer(stringRedisSerializer);
// hash的key也采用String的序列化方式
template.setHashKeySerializer(stringRedisSerializer);
// value序列化方式采用jackson
template.setValueSerializer(jackson2JsonRedisSerializer);
// hash的value序列化方式采用jackson
template.setHashValueSerializer(jackson2JsonRedisSerializer);
template.afterPropertiesSet();
return template;
}
}
CacheService.java
@Service
public class CacheService {
private static Logger logger = LoggerFactory.getLogger(CacheService.class);
private static final Long SUCCESS = 1L;
@Autowired
private RedisTemplate<String, Object> redisTemplate;
/**
* 指定缓存失效时间
*
* @param key 键
* @param time 时间(秒)
* @return
*/
public boolean expire(String key, long time) {
try {
if (time > 0) {
redisTemplate.expire(key, time, TimeUnit.SECONDS);
}
return true;
} catch (Exception e) {
logger.error(e.getMessage(), e);
return false;
}
}
/**
* 根据key 获取过期时间
*
* @param key 键 不能为null
* @return 时间(秒) 返回0代表为永久有效
*/
public long getExpire(String key) {
return redisTemplate.getExpire(key, TimeUnit.SECONDS);
}
/**
* 判断key是否存在
*
* @param key 键
* @return true 存在 false不存在
*/
public boolean hasKey(String key) {
try {
return redisTemplate.hasKey(key);
} catch (Exception e) {
logger.error(e.getMessage(), e);
return false;
}
}
/**
* 删除缓存
*
* @param key 可以传一个值 或多个
*/
@SuppressWarnings("unchecked")
public void del(String... key) {
if (key != null && key.length > 0) {
if (key.length == 1) {
redisTemplate.delete(key[0]);
} else {
redisTemplate.delete(CollectionUtils.arrayToList(key));
}
}
}
/**
* 普通缓存获取
*
* @param key 键
* @return 值
*/
public Object get(String key) {
return key == null ? null : redisTemplate.opsForValue().get(key);
}
/**
* 普通缓存放入
*
* @param key 键
* @param value 值
* @return true成功 false失败
*/
public boolean set(String key, Object value) {
try {
redisTemplate.opsForValue().set(key, value);
return true;
} catch (Exception e) {
logger.error(e.getMessage(), e);
return false;
}
}
/**
* 普通缓存放入并设置时间
*
* @param key 键
* @param value 值
* @param time 时间(秒) time要大于0 如果time小于等于0 将设置无限期
* @return true成功 false 失败
*/
public boolean set(String key, Object value, long time) {
try {
if (time > 0) {
redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
} else {
set(key, value);
}
return true;
} catch (Exception e) {
logger.error(e.getMessage(), e);
return false;
}
}
/**
* 递增
*
* @param key 键
* @param delta 要增加几(大于0)
* @return
*/
public long incr(String key, long delta) {
if (delta < 0) {
throw new RuntimeException("递增因子必须大于0");
}
return redisTemplate.opsForValue().increment(key, delta);
}
/**
* 递减
*
* @param key 键
* @param delta 要减少几(小于0)
* @return 147
*/
public long decr(String key, long delta) {
if (delta < 0) {
throw new RuntimeException("递减因子必须大于0");
}
return redisTemplate.opsForValue().increment(key, -delta);
}
/**
* 获取分布式锁
* @param lockKey 锁
* @param requestId 请求标识
* @param expireTime 单位秒
* @param waitTimeout 单位毫秒
* @return 是否获取成功
*/
public boolean tryLock(String lockKey, String requestId, int expireTime,long waitTimeout) {
long nanoTime = System.nanoTime(); // 当前时间
try{
String script = "if redis.call('setNx',KEYS[1],ARGV[1]) then if redis.call('get',KEYS[1])==ARGV[1] then return redis.call('expire',KEYS[1],ARGV[2]) else return 0 end end";
logger.info("开始获取分布式锁-key[{}]",lockKey);
int count = 0;
do{
RedisScript<String> redisScript = new DefaultRedisScript<>(script, String.class);
logger.debug("尝试获取分布式锁-key[{}]requestId[{}]count[{}]",lockKey,requestId,count);
Object result = redisTemplate.execute(redisScript, Collections.singletonList(lockKey),requestId,expireTime);
if(SUCCESS.equals(result)) {
logger.debug("尝试获取分布式锁-key[{}]成功",lockKey);
return true;
}
Thread.sleep(500L);//休眠500毫秒
count++;
}while ((System.nanoTime() - nanoTime) < TimeUnit.MILLISECONDS.toNanos(waitTimeout));
}catch(Exception e){
logger.error("尝试获取分布式锁-key[{}]异常",lockKey);
logger.error(e.getMessage(),e);
}
return false;
}
/**
* 释放锁
* @param lockKey 锁
* @param requestId 请求标识
* @return 是否释放成功
*/
public boolean releaseLock(String lockKey, String requestId) {
String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
RedisScript<String> redisScript = new DefaultRedisScript<>(script, String.class);
Object result = redisTemplate.execute(redisScript, Collections.singletonList(lockKey), requestId);
if (SUCCESS.equals(result)) {
return true;
}
return false;
}
}
加锁另一种方式，试过可用，上面未验证
/*** * 加锁 * @param key * @param value 当前时间+超时时间 * @return 锁住返回true */ public boolean lock(String key,String value){ if(stringRedisTemplate.opsForValue().setIfAbsent(key,value)){//setNX 返回boolean return true; } //如果锁超时 *** String currentValue = stringRedisTemplate.opsForValue().get(key); if(!StringUtils.isEmpty(currentValue) && Long.parseLong(currentValue)<System.currentTimeMillis()){ //获取上一个锁的时间 String oldvalue = stringRedisTemplate.opsForValue().getAndSet(key,value); if(!StringUtils.isEmpty(oldvalue)&&oldvalue.equals(currentValue)){ return true; } } return false; } /*** * 解锁 * @param key * @param value * @return */ public void unlock(String key,String value){ try { String currentValue = stringRedisTemplate.opsForValue().get(key); if(!StringUtils.isEmpty(currentValue)&¤tValue.equals(value)){ stringRedisTemplate.opsForValue().getOperations().delete(key); } } catch (Exception e) { log.error("解锁异常"); } }
