Redisson-实现分布式锁

配置redisson

引入必要依赖

		<dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-redisartifactId>
            
            <exclusions>
                <exclusion>
                    <groupId>io.lettucegroupId>
                    <artifactId>lettuce-coreartifactId>
                exclusion>
            exclusions>
        dependency>

        
        <dependency>
            <groupId>redis.clientsgroupId>
            <artifactId>jedisartifactId>
            <version>3.3.0version>
        dependency>

        
        <dependency>
            <groupId>org.redissongroupId>
            <artifactId>redissonartifactId>
            <version>3.13.6version>
        dependency>

配置redisson的bean-实例

package com.ligaixian.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;

@Configuration
public class MyRedissonConfig {
     

    /**
     * redissonClient 单节点配置
     * @return
     */
    @Bean
    public RedissonClient redissonClient(){
     
        Config config = new Config(); 
        config.useSingleServer().setAddress("redis://127.0.0.1:6379");

        RedissonClient redissonClient = Redisson.create(config);
        return redissonClient;
    }

    /**
     * redissonClient 集群配置
     * @return
     */
    @Bean
    public RedissonClient redissonClient(){
     
        Config config = new Config();
        config.useClusterServers()
                .setScanInterval(2000) // 集群状态扫描间隔时间，单位是毫秒
                //可以用"rediss://"来启用SSL连接
                .addNodeAddress("redis://127.0.0.1:7000", "redis://127.0.0.1:7001")
                .addNodeAddress("redis://127.0.0.1:7002");

        RedissonClient redissonClient = Redisson.create(config);
        return redissonClient;
    }
}

redisson实现分布式锁

package com.ligaixian.controller;

import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class RedissonController {
     

    final RedissonClient redissonClient;

    public RedissonController(RedissonClient redissonClient) {
     
        this.redissonClient = redissonClient;
    }

    @GetMapping("/hello")
    public String hello() {
     
        //1.获取一把锁
        RLock lock = redissonClient.getLock("my-lock");
        //2.加锁
        lock.lock(); //阻塞等待
        try {
     
            System.out.println("加锁成功，执行业务...." + Thread.currentThread().getId());
            Thread.sleep(30 * 1000);
        } catch (InterruptedException e) {
     
            e.printStackTrace();
        } finally {
     
            //3.解锁，即使解锁代码没有运行，redisson也会自动解锁，不会出现死锁
            System.out.println("释放锁..."+Thread.currentThread().getId());
            lock.unlock();
        }
        return "hello";
    }

}