springboot 集成redisson 以及分布式锁的使用

1、引入jar包

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
    <version>3.13.4</version>
</dependency>

2、增加Configuration类

@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);
        return Redisson.create(config);
    }
}

3、使用redission分布式锁

1 2	`@Autowired` `private` `RedissonClient redissonClient;`

//方法区
String key = "aa:bb:cc:01";
RLock rLock =redissonClient.getLock(key);
try{<br>// 尝试加锁，最多等待1秒，上锁以后10秒自动解锁<br>// 没有Watch Dog ，10s后自动释放
boolean res = rLock.tryLock(1,10, TimeUnit.SECONDS);
if(!res){
　　return new GeneralVO<>(400, "请勿重复提交", false);
}
}finally{
    rLock.unlock();
}

private void redissonDoc() throws InterruptedException {
    //1. 普通的可重入锁
    RLock lock = redissonClient.getLock("generalLock");
 
    // 拿锁失败时会不停的重试
    // 具有Watch Dog 自动延期机制 默认续30s 每隔30/3=10 秒续到30s
    lock.lock();
 
    // 尝试拿锁10s后停止重试,返回false
    // 具有Watch Dog 自动延期机制 默认续30s
    boolean res1 = lock.tryLock(10, TimeUnit.SECONDS);
 
    // 拿锁失败时会不停的重试
    // 没有Watch Dog ，10s后自动释放
    lock.lock(10, TimeUnit.SECONDS);
 
    // 尝试拿锁100s后停止重试,返回false
    // 没有Watch Dog ，10s后自动释放
    boolean res2 = lock.tryLock(100, 10, TimeUnit.SECONDS);
 
    //2. 公平锁 保证 Redisson 客户端线程将以其请求的顺序获得锁
    RLock fairLock = redissonClient.getFairLock("fairLock");
 
    //3. 读写锁 没错与JDK中ReentrantLock的读写锁效果一样
    RReadWriteLock readWriteLock = redissonClient.getReadWriteLock("readWriteLock");
    readWriteLock.readLock().lock();
    readWriteLock.writeLock().lock();
}