集成redisson
## 集成redisson实现redis分布式锁
Redisson是Redis官方推荐的Java版的Redis客户端。它提供的功能非常多，也非常强大，此处我们只用它的分布式锁功能。
1、引入依赖
```xml
<!-- Redisson 锁功能 -->
<dependency>
<groupId>org.redisson</groupId>
<artifactId>redisson-spring-boot-starter</artifactId>
<version>3.16.2</version>
</dependency>
```
2、添加工具类RedisLock.java
```java
package com.ruoyi.common.core.redis;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.concurrent.TimeUnit;
/**
* redis锁工具类
*
* @author ruoyi
*/
@Component
public class RedisLock
{
@Autowired
private RedissonClient redissonClient;
/**
* 获取锁
*
* @param lockKey 锁实例key
* @return 锁信息
*/
public RLock getRLock(String lockKey)
{
return redissonClient.getLock(lockKey);
}
/**
* 加锁
*
* @param lockKey 锁实例key
* @return 锁信息
*/
public RLock lock(String lockKey)
{
RLock lock = getRLock(lockKey);
lock.lock();
return lock;
}
/**
* 加锁
*
* @param lockKey 锁实例key
* @param leaseTime 上锁后自动释放锁时间
* @return true=成功；false=失败
*/
public Boolean tryLock(String lockKey, long leaseTime)
{
return tryLock(lockKey, 0, leaseTime, TimeUnit.SECONDS);
}
/**
* 加锁
*
* @param lockKey 锁实例key
* @param leaseTime 上锁后自动释放锁时间
* @param unit 时间颗粒度
* @return true=加锁成功；false=加锁失败
*/
public Boolean tryLock(String lockKey, long leaseTime, TimeUnit unit)
{
return tryLock(lockKey, 0, leaseTime, unit);
}
/**
* 加锁
*
* @param lockKey 锁实例key
* @param waitTime 最多等待时间
* @param leaseTime 上锁后自动释放锁时间
* @param unit 时间颗粒度
* @return true=加锁成功；false=加锁失败
*/
public Boolean tryLock(String lockKey, long waitTime, long leaseTime, TimeUnit unit)
{
RLock rLock = getRLock(lockKey);
boolean tryLock = false;
try
{
tryLock = rLock.tryLock(waitTime, leaseTime, unit);
}
catch (InterruptedException e)
{
return false;
}
return tryLock;
}
/**
* 释放锁
*
* @param lockKey 锁实例key
*/
public void unlock(String lockKey)
{
RLock lock = getRLock(lockKey);
lock.unlock();
}
/**
* 释放锁
*
* @param lock 锁信息
*/
public void unlock(RLock lock)
{
lock.unlock();
}
}
```
3、新增配置RedissonConfig.java
```java
package com.ruoyi.framework.config;
import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* redisson配置
*
* @author ruoyi
*/
@Configuration
public class RedissonConfig
{
@Value("${spring.redis.host}")
private String host;
@Value("${spring.redis.port}")
private String port;
@Value("${spring.redis.password}")
private String password;
@Bean(destroyMethod = "shutdown")
@ConditionalOnMissingBean(RedissonClient.class)
public RedissonClient redissonClient()
{
Config config = new Config();
config.useSingleServer().setAddress("redis://" + host + ":" + port); // 更多.set
return Redisson.create(config);
}
}
```
4、使用方式
```java
@Autowired
private RedisLock redisLock;
// lockKey 锁实例key waitTime 最多等待时间 leaseTime 上锁后自动释放锁时间 unit 时间颗粒度
redisLock.lock(lockKey);
redisLock.tryLock(lockKey, leaseTime);
redisLock.tryLock(lockKey, leaseTime, unit);
redisLock.tryLock(lockKey, waitTime, leaseTime, unit);
redisLock.unlock(lockKey);
redisLock.unlock(lock);
```