SpringBoot系列之集成Redission入门与实践教程

2023-11-09 10:03:42 浏览数 (3)

Redisson是一款基于java开发的开源项目，提供了很多企业级实践，比如分布式锁、消息队列、异步执行等功能。本文基于Springboot2版本集成redisson-spring-boot-starter实现redisson的基本应用

软件环境：

  • JDK 1.8
  • SpringBoot 2.2.1
  • Maven 3.2
  • Mysql 8.0.26
  • redisson-spring-boot-starter 3.15.6
  • 开发工具
    • IntelliJ IDEA
    • smartGit

项目搭建：

快速新建一个Spring Initializr项目，service url就选择这个https://start.aliyun.com，spring官网的url

选择jdk的版本，maven类型的项目

选择需要的依赖，选择之后，新生成的项目就会自动加上需要的maven配置，点击next生成一个SpringBoot的项目，不需要自己手工进行配置maven

这个里面没集成Redisson的starter，所以需要手工进行配置，需要注意一下redisson-spring-boot-starter和SpringBoot对应的版本关系

pom.xml文件加上redisson-spring-boot-starter配置，然后reimport引入jar

代码语言：javascript复制
 <dependency>
     <groupId>org.redisson</groupId>
     <artifactId>redisson-spring-boot-starter</artifactId>
     <version>3.15.6</version>
</dependency>

对于Redisson的配置，有多种方式，可以使用json文件配置，也可以使用yaml文件配置，然后再引进来，如下，新建一个redisson.yml文件，加上单机版的配置

redisson.yml

代码语言：javascript复制
singleServerConfig:
  idleConnectionTimeout: 10000
  connectTimeout: 10000
  timeout: 3000
  retryAttempts: 3
  retryInterval: 1500
  password: null
  subscriptionsPerConnection: 5
  clientName: null
  address: "redis://127.0.0.1:6379"
  subscriptionConnectionMinimumIdleSize: 1
  subscriptionConnectionPoolSize: 50
  connectionMinimumIdleSize: 32
  connectionPoolSize: 64
  database: 0
  dnsMonitoringInterval: 5000
threads: 8
nettyThreads: 0
codec: !<org.redisson.codec.JsonJacksonCodec> {}
"transportMode":"NIO"

在application.yml里引进redisson.yml

代码语言：javascript复制
spring:
  redis:
    redisson:
      file: classpath:redisson.yml

另外一种方式是可以直接在application.yml里直接加上配置，这种方式可能对于使用了分布式配置中心管理的项目更加方便一些

代码语言：javascript复制
spring:
  redis:
    redisson:
      config: |
        singleServerConfig:
          idleConnectionTimeout: 10000
          connectTimeout: 10000
          timeout: 3000
          retryAttempts: 3
          retryInterval: 1500
          password: null
          subscriptionsPerConnection: 5
          clientName: null
          address: "redis://127.0.0.1:6379"
          subscriptionConnectionMinimumIdleSize: 1
          subscriptionConnectionPoolSize: 50
          connectionMinimumIdleSize: 32
          connectionPoolSize: 64
          database: 0
          dnsMonitoringInterval: 5000
        threads: 0
        nettyThreads: 0
        codec: !<org.redisson.codec.JsonJacksonCodec> {}
        transportMode: "NIO"

在项目中如果想要自己加上配置，创建一个redisson可以先创建一个Config对象，如何进行设置就可以

代码语言：javascript复制
Config config = new Config();
config.useSingleServer().setAddress("redis://192.168.8.12
8:6379");
config.setCodec(new StringCodec());
return Redisson.create(config);

翻看redisson-spring-boot-starter的源码，也是创建Config，进行设置，这个starter为我们提供了自动配置功能，源码路径：org.redisson.spring.starter.RedissonAutoConfiguration#redisson

代码语言：javascript复制
 public RedissonClient redisson() throws IOException {
        Config config = null;
        Method clusterMethod = ReflectionUtils.findMethod(RedisProperties.class, "getCluster");
        Method timeoutMethod = ReflectionUtils.findMethod(RedisProperties.class, "getTimeout");
        Object timeoutValue = ReflectionUtils.invokeMethod(timeoutMethod, redisProperties);
        int timeout;
        if(null == timeoutValue){
            timeout = 10000;
        }else if (!(timeoutValue instanceof Integer)) {
            Method millisMethod = ReflectionUtils.findMethod(timeoutValue.getClass(), "toMillis");
            timeout = ((Long) ReflectionUtils.invokeMethod(millisMethod, timeoutValue)).intValue();
        } else {
            timeout = (Integer)timeoutValue;
        }

        if (redissonProperties.getConfig() != null) {
            try {
                config = Config.fromYAML(redissonProperties.getConfig());
            } catch (IOException e) {
                try {
                    config = Config.fromJSON(redissonProperties.getConfig());
                } catch (IOException e1) {
                    throw new IllegalArgumentException("Can't parse config", e1);
                }
            }
        } else if (redissonProperties.getFile() != null) {
            try {
                InputStream is = getConfigStream();
                config = Config.fromYAML(is);
            } catch (IOException e) {
                // trying next format
                try {
                    InputStream is = getConfigStream();
                    config = Config.fromJSON(is);
                } catch (IOException e1) {
                    throw new IllegalArgumentException("Can't parse config", e1);
                }
            }
        } else if (redisProperties.getSentinel() != null) {
            Method nodesMethod = ReflectionUtils.findMethod(Sentinel.class, "getNodes");
            Object nodesValue = ReflectionUtils.invokeMethod(nodesMethod, redisProperties.getSentinel());

            String[] nodes;
            if (nodesValue instanceof String) {
                nodes = convert(Arrays.asList(((String)nodesValue).split(",")));
            } else {
                nodes = convert((List<String>)nodesValue);
            }

            config = new Config();
            config.useSentinelServers()
                .setMasterName(redisProperties.getSentinel().getMaster())
                .addSentinelAddress(nodes)
                .setDatabase(redisProperties.getDatabase())
                .setConnectTimeout(timeout)
                .setPassword(redisProperties.getPassword());
        } else if (clusterMethod != null && ReflectionUtils.invokeMethod(clusterMethod, redisProperties) != null) {
            Object clusterObject = ReflectionUtils.invokeMethod(clusterMethod, redisProperties);
            Method nodesMethod = ReflectionUtils.findMethod(clusterObject.getClass(), "getNodes");
            List<String> nodesObject = (List) ReflectionUtils.invokeMethod(nodesMethod, clusterObject);

            String[] nodes = convert(nodesObject);

            config = new Config();
            config.useClusterServers()
                .addNodeAddress(nodes)
                .setConnectTimeout(timeout)
                .setPassword(redisProperties.getPassword());
        } else {
            config = new Config();
            String prefix = REDIS_PROTOCOL_PREFIX;
            Method method = ReflectionUtils.findMethod(RedisProperties.class, "isSsl");
            if (method != null && (Boolean)ReflectionUtils.invokeMethod(method, redisProperties)) {
                prefix = REDISS_PROTOCOL_PREFIX;
            }

            config.useSingleServer()
                .setAddress(prefix   redisProperties.getHost()   ":"   redisProperties.getPort())
                .setConnectTimeout(timeout)
                .setDatabase(redisProperties.getDatabase())
                .setPassword(redisProperties.getPassword());
        }
        if (redissonAutoConfigurationCustomizers != null) {
            for (RedissonAutoConfigurationCustomizer customizer : redissonAutoConfigurationCustomizers) {
                customizer.customize(config);
            }
        }
        return Redisson.create(config);
    }

在项目中使用的话，一般直接用@Resource加一个RedissonClient即可，不需要自己创建了，下面给出使用Redisson API实现的共同关注的人和排名榜的简单例子

代码语言：javascript复制
package com.example.redission;

import org.assertj.core.util.Lists;
import org.junit.jupiter.api.Test;
import org.redisson.api.*;
import org.redisson.client.RedisClient;
import org.redisson.client.protocol.ScoredEntry;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.*;
import java.util.concurrent.ExecutionException;
import java.util.stream.IntStream;

@SpringBootTest
class SpringbootRedissionApplicationTests {

    @Resource
    private RedissonClient redissonClient;

    @Test
    void contextLoads() throws ExecutionException, InterruptedException {
        // 共同关注的人
        RSet<Object> tom = redissonClient.getSet("tom");
        tom.addAll(Lists.newArrayList("令狐冲","james","风清扬"));
        RSet<Object> jack = redissonClient.getSet("jack");
        jack.addAll(Lists.newArrayList("令狐冲","tim","jack"));
        System.out.println("共同关注的人：" tom.readIntersectionAsync("jack").get());


        // 排名榜
        RScoredSortedSet<String> school = redissonClient.getScoredSortedSet("school");
        school.add(60, "tom");
        school.add(60, "jack");
        school.add(60, "tim");
        school.addScore("tom", 20);
        school.addScore("jack", 10);
        school.addScore("tim", 30);
        RFuture<Collection<ScoredEntry<String>>> collectionRFuture = school.entryRangeReversedAsync(0, -1);
        Iterator<ScoredEntry<String>> iterator = collectionRFuture.get().iterator();
        System.out.println("成绩从高到低排序");
        while(iterator.hasNext()) {
            ScoredEntry<String> next = iterator.next();
            String value = next.getValue();
            System.out.println(value);
        }
        RFuture<Collection<ScoredEntry<String>>> collectionRFuture1 = school.entryRangeReversedAsync(0, 2);
        Iterator<ScoredEntry<String>> iterator1 = collectionRFuture1.get().iterator();
        System.out.println("成绩前三名");
        while (iterator1.hasNext()) {
            System.out.println(iterator1.next().getValue());
        }

    }

}

附录

官网的Readme文档：https://github.com/redisson/redisson/blob/master/redisson-spring-boot-starter/README.md

config 教程 配置 入门 实践

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