如何使用Redission来实现分布式锁

1.maven导入

 		<dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson</artifactId>
            <version>3.12.1</version>
        </dependency>

2.配置config

import org.apache.commons.lang3.StringUtils;
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 RedissionConfig {

    @Value("${spring.redis.host}")
    private String host;

    @Value("${spring.redis.port}")
    private int port;

    @Value("${spring.redis.database}")
    private int database;

    @Value("${spring.redis.password}")
    private String password;


    @Bean
    public RedissonClient getRedisson() {
        Config config = new Config();
        config.useSingleServer().setAddress("redis://" + host + ":" + port)
                .setDatabase(database);
        if (StringUtils.isNotEmpty(password)) {
            config.useSingleServer().setAddress("redis://" + host + ":" + port).setDatabase(database)
                    .setPassword(password);
        } else {
            config.useSingleServer().setAddress("redis://" + host + ":" + port).setDatabase(database);
        }
        //设置全局默认看门狗机续期时间,如果在使用时不设置，则使用全局的，如果全局不设置，则使用默认的30000,单位毫秒
        config.setLockWatchdogTimeout(2000);
        return Redisson.create(config);
    }
}

3.具体方法

 				/**
                 * 加锁
                 */
                RLock lock = redissonClient.getLock(entity.getCarNo());
                boolean lockSuccess = lock.tryLock(3, TimeUnit.SECONDS);
                if (!lockSuccess) {
                    throw new RuntimeException("操作频繁,请稍后重试!");
                }

                try {
                  //执行具体的操作
                } finally {
                    if (lock.isLocked() && lock.isHeldByCurrentThread()) {
                        lock.unlock();//解锁
                    }
                }

            } else {
                throw new RuntimeException("审批编号：" + eventId + " 在系统中不存在");
            }