SpringBoot实战：分布式锁你知道多少，SpringBoot + Redis实现高性能分布式锁

在Spring Boot中，你可以使用spring-boot-starter-data-redis库来实现基于Redis的分布式锁。以下是一个简单的例子，展示了如何使用Spring Boot和Redis实现分布式锁：

1. 首先，在pom.xml中添加依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

2. 在Spring Boot应用中配置Redis：

spring:
  redis:
    host: localhost
    port: 6379

3. 创建一个服务来管理分布式锁：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
 
import java.util.Collections;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
 
@Service
public class RedisLockService {
 
    @Autowired
    private StringRedisTemplate redisTemplate;
 
    @Autowired
    private DefaultRedisScript<Long> lockScript;
 
    public String tryLock(String lockKey, long expireTime, TimeUnit unit) {
        String identifier = UUID.randomUUID().toString();
        long expireTimeInMillis = unit.toMillis(expireTime);
        Boolean locked = redisTemplate.execute(lockScript, Collections.singletonList(lockKey), identifier.toString(), String.valueOf(expireTimeInMillis + 1000));
        if (locked != null && locked) {
            return identifier;
        }
        return null;
    }
 
    public void unlock(String lockKey, String identifier) {
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        DefaultRedisScript<Long> unlockScript = new DefaultRedisScript<>();
        unlockScript.setScriptText(script);
        unlockScript.setResultType(Long.class);
        Long result = redisTemplate.execute(unlockScript, Collections.singletonList(lockKey), identifier);
        if (result != null && result.equals(1L)) {
            // Successfully unlocked
        }
    }
}

4. 使用RedisLockService获取和释放锁：

public void someMethod() {
    String lockKey = "some_lock_key";
    long expireTime = 10;
    TimeUnit unit = TimeUnit.SECONDS;
 
    String identifier = redisLockService.tryLock(lockKey, expireTime, unit);
    if (identifier != null) {
        try