基于Redis的Setnx实现分布式锁

一、 redis分布式锁原理

 

  并发 到Redis里变成了串行排队，单线程

 

二、基于Redis的Setnx实现分布式锁 

  1、pom

   

  <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

2、application.properties  配置redis

  

spring.redis.host=192.168.73.130

3、Controller层测试

 

package com.example.distributelock.controller;

import com.example.distributelock.lock.RedisLock;
import com.example.distributelock.lock.ZkLock;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@Slf4j
public class RedisLockController {
    @Autowired
    private RedisTemplate redisTemplate;

    @RequestMapping("redisLock")
    public String redisLock(){
        log.info("我进入了方法！");
        try (RedisLock redisLock = new RedisLock(redisTemplate,"redisKey",30)){
            if (redisLock.getLock()) {
                log.info("我进入了锁！！");
                Thread.sleep(15000);
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        log.info("方法执行完成");
        return "方法执行完成";
    }

    @RequestMapping("zkLock")
    public String zkLock(){
        log.info("我进入了方法！");
        try (ZkLock zkLock = new ZkLock("localhost:2181","order")){
            if (zkLock.getLock()) {
                log.info("我进入了锁！！");
                Thread.sleep(15000);
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        log.info("方法执行完成");
        return "方法执行完成";
    }
}

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