1、引入maven依赖

 <!--引入redisson-->
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson</artifactId>
            <version>3.12.0</version>
        </dependency>

2、config类

MyRedissonConfig

package com.ljs.gulimall.product.config;

import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.io.IOException;

@Configuration
public class MyRedissonConfig {

    @Bean(destroyMethod = "shutdown")
    public RedissonClient redisson() throws IOException {
        // 默认连接地址 127.0.0.1:6379
        Config config = new Config();
//可以用"rediss://"来启用 SSL 连接
        config.useSingleServer().setAddress("redis://xxx:6379").setPassword("xxxxx");
        return Redisson.create(config);
    }
}

3、可重入锁设计

redisson不存在死锁问题

 @ResponseBody
    @GetMapping("/hello")
    public String hello(){
        // 1、获取一把锁
        RLock lock = redisson.getLock("my-lock");

        // 2、加锁
        lock.lock();
        // 3、执行业务代码
        try{
            System.out.println("加锁成功，执行业务代码。。。"+Thread.currentThread().getId());
            Thread.sleep(30000);
        }catch (Exception exception) {

        }finally {
            // 4、解锁
            System.out.println("释放锁。。。"+Thread.currentThread().getId());
            lock.unlock();
        }
        return "hello";
    }

无论程序是否异常。程序正常执行时看门狗机制会锁自动续期，程序异常时会30秒后释放锁。