redis分布式锁-redisson

1. 定义连接池

package cn.cao.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.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * redisson 配置类
 * Created on 2020/11/01
 */
@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
    public RedissonClient getRedisson(){

        Config config = new Config();
        config.useSingleServer().setAddress("redis://" + host + ":" + port).setPassword(password);
        //添加主从配置
//        config.useMasterSlaveServers().setMasterAddress("").setPassword("").addSlaveAddress(new String[]{"",""});
//        config.useClusterServers().addNodeAddress(host).setPassword(password);
        return Redisson.create(config);
    }

}

2，redisson 操作类

package cn.cao.config;

import lombok.Getter;
import org.redisson.Redisson;
import org.redisson.api.*;
import org.redisson.config.Config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;

/**
 * redisson操作类
 */
@Service("redissonService")
public class RedissonService {

    @Autowired
    private RedissonClient redissonClient;


    public void getRedissonClient() throws IOException {
        Config config = redissonClient.getConfig();
        System.out.println(config.toJSON().toString());
    }

    /**`
     * 获取字符串对象
     *
     * @param objectName
     * @return
     */
    public <T> RBucket<T> getRBucket(String objectName) {
        RBucket<T> bucket = redissonClient.getBucket(objectName);
        return bucket;
    }

    /**
     * 获取Map对象
     *
     * @param objectName
     * @return
     */
    public <K, V> RMap<K, V> getRMap(String objectName) {
        RMap<K, V> map = redissonClient.getMap(objectName);
        return map;
    }

    /**
     * 获取有序集合
     *
     * @param objectName
     * @return
     */
    public <V> RSortedSet<V> getRSortedSet(String objectName) {
        RSortedSet<V> sortedSet = redissonClient.getSortedSet(objectName);
        return sortedSet;
    }

    /**
     * 获取集合
     *
     * @param objectName
     * @return
     */
    public <V> RSet<V> getRSet(String objectName) {
        RSet<V> rSet = redissonClient.getSet(objectName);
        return rSet;
    }

    /**
     * 获取列表
     *
     * @param objectName
     * @return
     */
    public <V> RList<V> getRList(String objectName) {
        RList<V> rList = redissonClient.getList(objectName);
        return rList;
    }

    /**
     * 获取队列
     *
     * @param objectName
     * @return
     */
    public <V> RQueue<V> getRQueue(String objectName) {
        RQueue<V> rQueue = redissonClient.getQueue(objectName);
        return rQueue;
    }

    /**
     * 获取双端队列
     *
     * @param objectName
     * @return
     */
    public <V> RDeque<V> getRDeque(String objectName) {
        RDeque<V> rDeque = redissonClient.getDeque(objectName);
        return rDeque;
    }


    /**
     * 获取锁
     *
     * @param objectName
     * @return
     */
    public RLock getRLock(String objectName) {
        RLock rLock = redissonClient.getLock(objectName);
        return rLock;
    }

    /**
     * 获取读取锁
     *
     * @param objectName
     * @return
     */
    public RReadWriteLock getRWLock(String objectName) {
        RReadWriteLock rwlock = redissonClient.getReadWriteLock(objectName);
        return rwlock;
    }

    /**
     * 获取原子数
     *
     * @param objectName
     * @return
     */
    public RAtomicLong getRAtomicLong(String objectName) {
        RAtomicLong rAtomicLong = redissonClient.getAtomicLong(objectName);
        return rAtomicLong;
    }

    /**
     * 获取记数锁
     *
     * @param objectName
     * @return
     */
    public RCountDownLatch getRCountDownLatch(String objectName) {
        RCountDownLatch rCountDownLatch = redissonClient.getCountDownLatch(objectName);
        return rCountDownLatch;
    }

    /**
     * 获取消息的Topic
     *
     * @param objectName
     * @return
     */
    public <M> RTopic<M> getRTopic(String objectName) {
        RTopic<M> rTopic = redissonClient.getTopic(objectName);
        return rTopic;
    }
}

3,使用

RLock lock = redissonService.getRLock("lock");
try {
    if (lock.tryLock(5, 6, TimeUnit.SECONDS)) {
        try {
            Integer ip = (Integer) redisUtil.get("ip3");
            // 业务代码
            log.info("进入业务代码: " + ip);
            System.out.println(ip);
            System.out.println(Thread.currentThread().getName());
            redisUtil.set("ip3", ip - 1);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //释放
            lock.unlock();
        }
    } else {
        // 超过过时s 获取不到锁
        log.info("没有获取到分布式锁");
    }
} catch (InterruptedException e) {
    e.printStackTrace();
}