目前常用的客户端有jedis，lettuce，redisson

共同点：都提供了基于Redis操作的Java API，只是封装程度，具体实现稍有不同

不同点：

  •   jedis：

是Redis的Java实现的客户端。支持基本的数据类型如：String、Hash、List、Set、Sorted Set。

特点：使用阻塞的I/O，方法调用同步，程序流需要等到socket处理完I/O才能执行，不支持异步操作。Jedis客户端实例不是线程安全的，需要通过连接池来使用Jedis。

  • Redisson

优点： 分布式锁，分布式集合，可通过Redis支持延迟队列

  •  Lettuce

用于线程安全同步，异步和响应使用，支持集群，Sentinel，管道和编码器。

基于Netty框架的事件驱动的通信层，其方法调用是异步的。Lettuce的API是线程安全的，所以可以操作单个Lettuce连接来完成各种操作。

lettuce连接池配置

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

//在2.0版本之前默认引入是jedispool连接池,在2.0之后默认引入lettuce连接池


             <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-pool2</artifactId>
            </dependency>
##application.properties 添加redis连接信息

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
 spring.datasource.url=jdbc:mysql://localhost:3306/mytest?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT%2B8
 spring.datasource.username=root
 spring.datasource.password=123456server.port=8945
 #redis数据库默认使用db0
 spring.redis.database=2
 spring.redis.password=
 spring.redis.port=6379
 spring.redis.host=127.0.0.1
 # 连接超时时间
 spring.redis.timeout=5000
 # 连接池最大连接数（使用负值表示没有限制）
 spring.redis.lettuce.pool.max-active=3
 # 连接池中的最小空闲连接
 spring.redis.lettuce.pool.min-idle=2
 # 连接池中的最大空闲连接
 spring.redis.lettuce.pool.max-idle=3
 # 连接池最大阻塞等待时间（使用负值表示没有限制）
 spring.redis.lettuce.pool.max-wait=-1
 #在关闭客户端连接之前等待任务处理完成的最长时间，在这之后，无论任务是否执行完成，都会被执行器关闭，默认100ms
 spring.redis.lettuce.shutdown-timeout=100
 #是否缓存空值
 spring.cache.redis.cache-null-values=false
//配置类
package org.example.base.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisPassword;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.time.Duration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * @author l
 * @date Created in 2020/11/3 10:51
 */
@Configuration
@EnableCaching
public class RedisConfig {
    @Value("${spring.redis.database}")
    private int database;

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

    @Value("${spring.redis.password}")
    private String password;

    @Value("${spring.redis.port}")
    private int port;

    @Value("${spring.redis.timeout}")
    private long timeout;

    @Value("${spring.redis.lettuce.shutdown-timeout}")
    private long shutDownTimeout;

    @Value("${spring.redis.lettuce.pool.max-idle}")
    private int maxIdle;

    @Value("${spring.redis.lettuce.pool.min-idle}")
    private int minIdle;

    @Value("${spring.redis.lettuce.pool.max-active}")
    private int maxActive;

    @Value("${spring.redis.lettuce.pool.max-wait}")
    private long maxWait;

    Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);

    @Bean
    public LettuceConnectionFactory lettuceConnectionFactory() {
        GenericObjectPoolConfig genericObjectPoolConfig = new GenericObjectPoolConfig();
        genericObjectPoolConfig.setMaxIdle(maxIdle);
        genericObjectPoolConfig.setMinIdle(minIdle);
        genericObjectPoolConfig.setMaxTotal(maxActive);
        genericObjectPoolConfig.setMaxWaitMillis(maxWait);
        genericObjectPoolConfig.setTimeBetweenEvictionRunsMillis(100);
        RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration();
        redisStandaloneConfiguration.setDatabase(database);
        redisStandaloneConfiguration.setHostName(host);
        redisStandaloneConfiguration.setPort(port);
        redisStandaloneConfiguration.setPassword(RedisPassword.of(password));
        LettuceClientConfiguration clientConfig = LettucePoolingClientConfiguration.builder()
                .commandTimeout(Duration.ofMillis(timeout))
                .shutdownTimeout(Duration.ofMillis(shutDownTimeout))
                .poolConfig(genericObjectPoolConfig)
                .build();

        LettuceConnectionFactory factory = new LettuceConnectionFactory(redisStandaloneConfiguration, clientConfig);
//        factory.setShareNativeConnection(true);
//        factory.setValidateConnection(false);
        return factory;
    }

    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(lettuceConnectionFactory);
        //使用Jackson2JsonRedisSerializer替换默认的JdkSerializationRedisSerializer来序列化和反序列化redis的value值
        ObjectMapper mapper = new ObjectMapper();
        mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        mapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance,
                ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
        jackson2JsonRedisSerializer.setObjectMapper(mapper);
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        //key采用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        // hash的key也采用String的序列化方式
        template.setHashKeySerializer(stringRedisSerializer);
        // value序列化方式采用jackson
        template.setValueSerializer(jackson2JsonRedisSerializer);
        // hash的value序列化方式采用jackson
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }


    @Bean("redisCacheManager")
    @Primary
    public CacheManager cacheManager( LettuceConnectionFactory lettuceConnectionFactory) {
        RedisSerializer<String> redisSerializer = new StringRedisSerializer();


        //解决查询缓存转换异常的问题
        ObjectMapper mapper = new ObjectMapper();
        mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        mapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance,
                ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
        jackson2JsonRedisSerializer.setObjectMapper(mapper);

        // 配置1 ,
        RedisCacheConfiguration config1 = RedisCacheConfiguration.defaultCacheConfig()
                //缓存失效时间
                .entryTtl(Duration.ofSeconds(30))
                //key序列化方式
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                //value序列化方式
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
                //不允许缓存null值
                .disableCachingNullValues();
        //配置2 ,
        RedisCacheConfiguration config2 = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofMinutes(1000))
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
                .disableCachingNullValues();


        //设置一个初始化的缓存空间set集合
        Set<String> cacheNames = new HashSet<>();
        cacheNames.add("my-redis-cache1");
        cacheNames.add("my-redis-cache2");


        //对每个缓存空间应用不同的配置
        Map<String, RedisCacheConfiguration> configurationMap = new HashMap<>(3);
        configurationMap.put("my-redis-cache1", config1);
        configurationMap.put("my-redis-cache2", config2);

        return RedisCacheManager.builder(lettuceConnectionFactory)
                //默认缓存配置
                .cacheDefaults(config1)
                //初始化缓存空间
                .initialCacheNames(cacheNames)
                //初始化缓存配置
                .withInitialCacheConfigurations(configurationMap).build();


    }

使用时引入redistemplate即可

RedissonClient 操作示例

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson</artifactId>
            <version>3.8.2</version>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson-spring-boot-starter</artifactId>
            <version>LATEST</version>
        </dependency>
# Redisson 配置
singleServerConfig:
  address: "redis://192.168.1.140:6379"
  password: null
  clientName: null
  database: 15 #选择使用哪个数据库0~15
  idleConnectionTimeout: 10000
  pingTimeout: 1000
  connectTimeout: 10000
  timeout: 3000
  retryAttempts: 3
  retryInterval: 1500
  reconnectionTimeout: 3000
  failedAttempts: 3
  subscriptionsPerConnection: 5
  subscriptionConnectionMinimumIdleSize: 1
  subscriptionConnectionPoolSize: 50
  connectionMinimumIdleSize: 32
  connectionPoolSize: 64
  dnsMonitoringInterval: 5000
  #dnsMonitoring: false

threads: 0
nettyThreads: 0
codec:
  class: "org.redisson.codec.JsonJacksonCodec"
transportMode: "NIO"
spring:
  redis:
    redisson:
      config: classpath:redisson-config.yaml
@RestController
@RequestMapping("/")
public class TeController {

    @Autowired
    private RedissonClient redissonClient;

    static long i = 20;
    static long sum = 300;

//    ========================== String =======================
    @GetMapping("/set/{key}")
    public String s1(@PathVariable String key) {
        // 设置字符串
        RBucket<String> keyObj = redissonClient.getBucket(key);
        keyObj.set(key + "1-v1");
        return key;
    }

    @GetMapping("/get/{key}")
    public String g1(@PathVariable String key) {
        // 设置字符串
        RBucket<String> keyObj = redissonClient.getBucket(key);
        String s = keyObj.get();
        return s;
    }

    //    ========================== hash =======================-=

    @GetMapping("/hset/{key}")
    public String h1(@PathVariable String key) {

        Ur ur = new Ur();
        ur.setId(MathUtil.randomLong(1,20));
        ur.setName(key);
      // 存放 Hash
        RMap<String, Ur> ss = redissonClient.getMap("UR");
        ss.put(ur.getId().toString(), ur);
        return ur.toString();
    }

    @GetMapping("/hget/{id}")
    public String h2(@PathVariable String id) {
        // hash 查询
        RMap<String, Ur> ss = redissonClient.getMap("UR");
        Ur ur = ss.get(id);
        return ur.toString();
    }

    // 查询所有的 keys
    @GetMapping("/all")
    public String all(){
        RKeys keys = redissonClient.getKeys();
        Iterable<String> keys1 = keys.getKeys();
        keys1.forEach(System.out::println);
        return keys.toString();
    }

    // ================== ==============读写锁测试 =============================

    @GetMapping("/rw/set/{key}")
    public void rw_set(){
//        RedissonLock.
        RBucket<String> ls_count = redissonClient.getBucket("LS_COUNT");
        ls_count.set("300",360000000l, TimeUnit.SECONDS);
    }

    // 减法运算
    @GetMapping("/jf")
    public void jf(){

        String key = "S_COUNT";

//        RAtomicLong atomicLong = redissonClient.getAtomicLong(key);
//        atomicLong.set(sum);
//        long l = atomicLong.decrementAndGet();
//        System.out.println(l);

        RAtomicLong atomicLong = redissonClient.getAtomicLong(key);
        if (!atomicLong.isExists()) {
            atomicLong.set(300l);
        }

        while (i == 0) {
            if (atomicLong.get() > 0) {
                long l = atomicLong.getAndDecrement();
                        try {
                            Thread.sleep(1000l);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                i --;
                System.out.println(Thread.currentThread().getName() + "->" + i + "->" + l);
            }
        }


    }

    @GetMapping("/rw/get")
    public String rw_get(){

        String key = "S_COUNT";
        Runnable r = new Runnable() {
            @Override
            public void run() {
                RAtomicLong atomicLong = redissonClient.getAtomicLong(key);
                if (!atomicLong.isExists()) {
                    atomicLong.set(300l);
                }
                if (atomicLong.get() > 0) {
                    long l = atomicLong.getAndDecrement();
                    i --;
                    System.out.println(Thread.currentThread().getName() + "->" + i + "->" + l);
                }
            }
        };

        while (i != 0) {
            new Thread(r).start();
//            new Thread(r).run();
//            new Thread(r).run();
//            new Thread(r).run();
//            new Thread(r).run();
        }


        RBucket<String> bucket = redissonClient.getBucket(key);
        String s = bucket.get();
        System.out.println("================线程已结束================================" + s);

        return s;
    }

}