springboot redission 分布式锁

Spring Boot中使用Redisson实现分布式锁的方法如下：

1. 首先，需要在项目中引入Redisson依赖。在pom.xml文件中添加以下依赖：

```xml
<dependency>
<groupId>org.redisson</groupId>
<artifactId>redisson</artifactId>
<version>3.16.4</version>
</dependency>
```

2. 在Spring Boot配置文件（如application.yml）中配置Redisson连接信息：

```yaml
redisson:
config:
singleServerConfig:
address: "redis://127.0.0.1:6379"
timeout: 10000
pingTimeout: 10000
```

3. 创建一个Redisson配置类，用于初始化RedissonClient实例：

```java
import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class RedissonConfig {

@Value("${redisson.config.singleServerConfig.address}")
private String address;

@Value("${redisson.config.singleServerConfig.timeout}")
private int timeout;

@Value("${redisson.config.singleServerConfig.pingTimeout}")
private int pingTimeout;

@Bean
public RedissonClient redissonClient() {
Config config = new Config();
config.useSingleServer()
.setAddress(address)
.setTimeout(timeout)
.setPingTimeout(pingTimeout);
return Redisson.create(config);
}
}
```

4. 使用RedissonClient实例获取分布式锁：

```java
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

@Service
public class DistributedLockService {

@Autowired
private RedissonClient redissonClient;

public void lock(String lockKey, Runnable task, long waitTime, long leaseTime) {
RLock lock = redissonClient.getLock(lockKey);
try {
// 尝试获取锁，等待时间waitTime，锁过期时间leaseTime
if (lock.tryLock(waitTime, leaseTime, TimeUnit.SECONDS)) {
try {
task.run();
} finally {
lock.unlock();
}
} else {
System.out.println("获取锁失败");
}
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
if (lock.isHeldByCurrentThread()) {
lock.unlock();
}
}
}
}
```