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SpringBoot集成Redisson初步

56571 开源 | 2022-1-28

redisson 是基于redis的扩展库,使得redis除了应用于缓存以外,还能做队列等数据结构,直接使用的分布式锁,以及人物调度器等。

目前有很多项目还在使用jedis的 setNx 充当分布式锁,然而这个锁是有问题的,redisson是java支持redis的redlock的唯一实现, 集成该项目后只需要极少的配置.就能够使用redisson的全部功能. 目前支持 集群模式,云托管模式,单Redis节点模式,哨兵模式,主从模式 配置. 支持 可重入锁,公平锁,联锁,红锁,读写锁 锁定模式。

Redis集群组态的最低要求是必须有三个主节点。集群如何搭建参考之前文章,之前操作后最终是四个master和四个从。


官方地址:https://github.com/redisson/redisson 

WIKI:https://github.com/redisson/redisson/wiki/%E7%9B%AE%E5%BD%95 

redisson-spring-boot-starter:https://gitee.com/ztp/redisson-spring-boot-starter 


POM文件:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>springBoot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springBoot</name>
    <description>springBoot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson-spring-boot-starter</artifactId>
            <version>3.11.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>


配置application.yml,为了演示Spring的RedisTemplate

server:
  port: 80
spring:
  redis:
    cluster:
      nodes:
        - 192.168.3.22:7001
        - 192.168.3.22:7002
        - 192.168.3.22:7003
        - 192.168.3.22:7004
        - 192.168.3.22:8001
        - 192.168.3.22:8002
        - 192.168.3.22:8003
        - 192.168.3.22:8004

在resources文件夹,即application.yml同级目录创建redisson.yml,内容参考官网WIKI,把节点更改为自己的

---
clusterServersConfig:
  idleConnectionTimeout: 10000
  connectTimeout: 10000
  timeout: 3000
  retryAttempts: 3
  retryInterval: 1500
  password: null
  subscriptionsPerConnection: 5
  clientName: null
  loadBalancer: !<org.redisson.connection.balancer.RoundRobinLoadBalancer> {}
  slaveSubscriptionConnectionMinimumIdleSize: 1
  slaveSubscriptionConnectionPoolSize: 50
  slaveConnectionMinimumIdleSize: 32
  slaveConnectionPoolSize: 64
  masterConnectionMinimumIdleSize: 32
  masterConnectionPoolSize: 64
  readMode: "SLAVE"
  nodeAddresses:
    - "redis://192.168.3.22:7001"
    - "redis://192.168.3.22:7002"
    - "redis://192.168.3.22:7003"
    - "redis://192.168.3.22:7004"
    - "redis://192.168.3.22:8001"
    - "redis://192.168.3.22:8002"
    - "redis://192.168.3.22:8003"
    - "redis://192.168.3.22:8004"
  scanInterval: 1000


创建一个用于获取RedissonClient的管理类,这里仅为演示,实际请用单例模式:

package com.example.springboot.tool;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.stereotype.Component;
import org.springframework.util.ResourceUtils;

/**
 * @Auther: Java小强
 * @Date: 2022/1/27 - 23:15
 * @Decsription: com.example.springboot.tool
 * @Version: 1.0
 */
@Setter
@Getter
@ToString
@Component
public class MyRedissonClient {

    public RedissonClient getRedisson() {
        RedissonClient redisson = null;
//        Config config = new Config();
//        config.useSingleServer().setAddress("127.0.0.1:6379").setPassword("xrBZgBDp182B3Dl0A");
//        RedissonClient redisson = Redisson.create(config);

        // 默认连接地址 127.0.0.1:6379
//        RedissonClient redisson = Redisson.create();

        try {
            Config config = Config.fromYAML(ResourceUtils.getFile("classpath:redisson.yml"));
            redisson = Redisson.create(config);
        } catch (Exception e) {
            e.printStackTrace();
            redisson = null;
        }

        return redisson;
    }

}


写一个Controller,里面包含了RedisTemplate和Redisson两种工具的使用方式,业务都是模仿扣库存

package com.example.springboot.controller;

import com.example.springboot.tool.MyRedissonClient;
import org.redisson.api.RBucket;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.redisson.client.codec.StringCodec;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * @Auther: Java小强
 * @Date: 2022/1/27 - 22:28
 * @Decsription: com.example.springboot.controller
 * @Version: 1.0
 */
@RestController
@RequestMapping("/redis")
public class RedisController {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Autowired
    private MyRedissonClient myRedissonClient;

    @GetMapping("/doStockson/{id}")
    public String doStockson(@PathVariable("id") String id) {
        String uuid = UUID.randomUUID().toString();
        String lockKey = "STOCK_" + id + "_LOCK";
        String stockKey = "stock" + id;
        RedissonClient redisson = myRedissonClient.getRedisson();

        RLock lock = redisson.getLock(lockKey);
        // 加锁以后10秒钟自动解锁 无需调用unlock方法手动解锁
//        lock.lock(10, TimeUnit.SECONDS);

        // 尝试加锁,最多等待100秒,上锁以后30秒自动解锁
        try {
            boolean res = lock.tryLock(100, 10, TimeUnit.SECONDS);
            if (res) {
                System.out.println("Do My Jobs...");
                RBucket<String> bucket = redisson.getBucket(stockKey, StringCodec.INSTANCE);
                if (null == bucket || "".equals(bucket.get())) {
                    return "error code";
                }
                int stock = Integer.parseInt(bucket.get());
                System.out.println("剩余库存:" + stock);
                if (stock > 0) {
                    stock--;
                    bucket.set(stock + "");
                    System.out.println("库存扣除成功,剩余:" + stock);
                } else {
                    System.out.println("库存扣除失败");
                }
            }
        }catch (Exception exception){

        }finally {
            lock.unlock();
        }

        return "Redisson Job Is Done";
    }

    @GetMapping("/doStock/{id}")
    public String getStock(@PathVariable("id") String id) {
        String uuid = UUID.randomUUID().toString();
        String lockKey = "STOCK_" + id + "_LOCK";
        String stockKey = "stock" + id;
        // 如果程序30妙也完不成,则要考虑看门狗给key续命问题
        Boolean re = stringRedisTemplate.opsForValue().setIfAbsent(lockKey, uuid, 30, TimeUnit.SECONDS);
        if (!re) {
            return "error code";
        }
        try {
            System.out.println("Do My Jobs...");
            String stockStr = stringRedisTemplate.opsForValue().get(stockKey);
            if (null == stockStr || "".equals(stockStr)) {
                return "error code";
            }
            int stock = Integer.parseInt(stockStr);
            System.out.println("剩余库存:" + stock);
            if (stock > 0) {
                stock--;
                stringRedisTemplate.opsForValue().set(stockKey, stock + "");
                System.out.println("库存扣除成功,剩余:" + stock);
            } else {
                System.out.println("库存扣除失败");
            }
        } finally {
            if (stringRedisTemplate.opsForValue().get(lockKey).equals(uuid)) {
                stringRedisTemplate.delete(lockKey);
            }
        }
        return "Redis Job Is Done";
    }

}


分别访问:

http://localhost/redis/doStock/1001 

http://localhost/redis/doStockson/1001 


可以打个断点,或者在方法内休眠,在进入Lock后再发一个请求看效果。

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回复 Java小强 评论于 2022-01-28 14:08
可以写一个配置类
package com.example.springboot.tool;

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 org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;

import java.io.IOException;

/**
* @Auther: Java小强
* @Date: 2022/1/28 - 10:29
* @Decsription: com.example.springboot.tool
* @Version: 1.0
*/
@Configuration
public class InitializingRedis{

    @Bean
    public RedissonClient getRedissonClient() throws IOException {
        ResourceLoader loader = new DefaultResourceLoader();
        Resource resource = loader.getResource("classpath:redisson.yml");
        Config config = Config.fromYAML(resource.getInputStream());
        config.useClusterServers();
        return Redisson.create(config);
    }

}