Redis系列：Spring Boot整合Redisson

Redis作为目前流行Nosql数据库，在生产中广泛被使用。其基于内存和NIO的操作，以及丰富的数据结构，为分布式业务场景提供高性能的存储服务。每个服务相当于一个客户端，需要通过客户端工具连接Redis服务，因此衍生出了一系列客户端工具，包含Jedis，Redisson, Lettuce。本文将介绍Spring Boot如何整合Redisson。

Redisson介绍

Redisson github : wiki
Redisson作为一个客户端工具，能够使开发者减少对Redis的关注，从而将精力集中到业务上。Redisson除了提供基础的Redis服务外，还提供了较为可靠的分布式锁，布隆过滤器等功能。

引入依赖

pom.xml，引入Redisson 3.13.4版本

<?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>2.5.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.elio</groupId>
    <artifactId>redission-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>redission-demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <redission.version>3.13.4</redission.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-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- 操作Redis-->
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson-spring-boot-starter</artifactId>
            <version>${redission.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

配置application.properties

spring.redission.host = 127.0.0.1
spring.redission.port = 6379

新增RedisConfig

package com.elio.redissiondemo.config;

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

/**
 * @ClassName : RedissionConfig
 * @Description : redission
 * @Date: 2021/06/09
 */
@Configuration
public class RedissonConfig {

    @Value("${spring.redission.host}")
    private String host;

    @Value("${spring.redission.port}")
    private String port;

    @Bean
    public RedissonClient getRedissonClient() {
        Config config = new Config();
        config.useSingleServer().setAddress("redis://"+host+":"+port+"");

        return Redisson.create(config);
    }
}

测试

 package com.elio.redissiondemo;

import com.elio.redissiondemo.exception.BusinessException;
import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;
import org.redisson.api.RBucket;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;

import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;

/**
 * @ClassName : RedissionTest
 * @Description :
 * @Date: 2021/06/10
 */
@Slf4j
public class RedissionTest extends RedissonDemoApplicationTests {

    @Resource
    RedissonClient redissonClient;

    @Test
    public void testRedisson() {
        RBucket<String> result = redissonClient.getBucket("hello");
        result.set("world", 100, TimeUnit.SECONDS);
        log.info("result = [{}]" , result.get());
    }

    @Test
    public void testRedissonLock() {
        RLock lock = redissonClient.getLock("lock");
        try {
            boolean result = lock.tryLock(3, 3, TimeUnit.SECONDS);
            if(!result) {
                throw new BusinessException(100, "出现错误");
            }
            log.info("加锁成功，处理业务逻辑");
        } catch (InterruptedException e) {
            log.error("加锁出现错误, errMsg = [{}]", e.getMessage(), e);
        } finally {
            lock.unlock();
        }
    }
}

测试结果

image.png