Spring Boot + Redis 实现各种操作，写得太好了吧！

左手的ㄟ右手 2022-08-28 06:50 242阅读 0赞

> https://blog.csdn.net/qq\_42105629/article/details/102589319

## 一、Jedis,Redisson,Lettuce 三者的区别 ##

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：

*  1.1、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。

*  1.1、Redisson

优点点：分布式锁，分布式集合，可通过 Redis 支持延迟队列。

*  1.3、 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。

## 二、Jedis ##

## 三、RedisTemplate ##

### 3.1、使用配置 ###

maven 配置引入，（要加上版本号，我这里是因为 Parent 已声明）

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

application-dev.yml

spring:
      redis:
        host: 192.168.1.140
        port: 6379
        password:
        database: 15 # 指定redis的分库（共16个0到15）

### 3.2、使用示例 ###

@Resource
     private StringRedisTemplate stringRedisTemplate;
     
        @Override
        public CustomersEntity findById(Integer id) {
            // 需要缓存
            // 所有涉及的缓存都需要删除，或者更新
            try {
                String toString = stringRedisTemplate.opsForHash().get(REDIS_CUSTOMERS_ONE, id + "").toString();
                if (toString != null) {
                    return JSONUtil.toBean(toString, CustomersEntity.class);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            // 缓存为空的时候，先查,然后缓存redis
            Optional<CustomersEntity> byId = customerRepo.findById(id);
            if (byId.isPresent()) {
                CustomersEntity customersEntity = byId.get();
                try {
                    stringRedisTemplate.opsForHash().put(REDIS_CUSTOMERS_ONE, id + "", JSONUtil.toJsonStr(customersEntity));
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return customersEntity;
            }
            return null;
        }

### 3.3、扩展 ###

#### 3.3.1、spring-boot-starter-data-redis 的依赖包 ####

![de3b64c8b2cac14bfd0d655bfb4c7939.png][]

#### 3.3.2、stringRedisTemplate API（部分展示） ####

opsForHash --> hash 操作  
opsForList --> list 操作  
opsForSet --> set 操作  
opsForValue --> string 操作  
opsForZSet --> Zset 操作  
![117774661c08c9cb6047dd69a2071fd0.png][]

#### 3.3.3 StringRedisTemplate 默认序列化机制 ####

public class StringRedisTemplate extends RedisTemplate<String, String> {
    
    	/**
    	 * Constructs a new <code>StringRedisTemplate</code> instance. {@link #setConnectionFactory(RedisConnectionFactory)}
    	 * and {@link #afterPropertiesSet()} still need to be called.
    	 */
    	public StringRedisTemplate() {
    		RedisSerializer<String> stringSerializer = new StringRedisSerializer();
    		setKeySerializer(stringSerializer);
    		setValueSerializer(stringSerializer);
    		setHashKeySerializer(stringSerializer);
    		setHashValueSerializer(stringSerializer);
    	}
    	}

## 四、RedissonClient 操作示例 ##

### 4.1 基本配置 ###

#### 4.1.1、Maven pom 引入 ####

<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>

#### 4.1.2、添加配置文件 Yaml 或者 json 格式 ####

redisson-config.yml

# 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"

或者，配置 redisson-config.json

{
      "singleServerConfig": {
        "idleConnectionTimeout": 10000,
        "pingTimeout": 1000,
        "connectTimeout": 10000,
        "timeout": 3000,
        "retryAttempts": 3,
        "retryInterval": 1500,
        "reconnectionTimeout": 3000,
        "failedAttempts": 3,
        "password": null,
        "subscriptionsPerConnection": 5,
        "clientName": null,
        "address": "redis://192.168.1.140:6379",
        "subscriptionConnectionMinimumIdleSize": 1,
        "subscriptionConnectionPoolSize": 50,
        "connectionMinimumIdleSize": 10,
        "connectionPoolSize": 64,
        "database": 0,
        "dnsMonitoring": false,
        "dnsMonitoringInterval": 5000
      },
      "threads": 0,
      "nettyThreads": 0,
      "codec": null,
      "useLinuxNativeEpoll": false
    }

#### 4.1.3、读取配置 ####

新建读取配置类

@Configuration
    public class RedissonConfig {
    
        @Bean
        public RedissonClient redisson() throws IOException {
    
            // 两种读取方式，Config.fromYAML 和 Config.fromJSON
    //        Config config = Config.fromJSON(RedissonConfig.class.getClassLoader().getResource("redisson-config.json"));
            Config config = Config.fromYAML(RedissonConfig.class.getClassLoader().getResource("redisson-config.yml"));
            return Redisson.create(config);
        }
    }

或者，在 application.yml 中配置如下

spring:
      redis:
        redisson:
          config: classpath:redisson-config.yaml

### 4.2 使用示例 ###

@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;
        }
    
    }

### 4.3 扩展 ###

#### 4.3.1 丰富的 jar 支持，尤其是对 Netty NIO 框架 ####

#### 4.3.2 丰富的配置机制选择，这里是详细的配置说明 ####

关于序列化机制中，就有很多

![5c433e7fa4893fa15e218af9c90375a4.png][]  
![2292431c61b538f51eaca57573d0edd1.png][]

#### 4.3.3 API 支持（部分展示），具体的 Redis --> RedissonClient , 可查看这里 ####

![f75986c6b020da5c15cad1784cb7b1b2.png][]

#### 4.3.4 轻便的丰富的锁机制的实现 ####

##### 4.3.4.1 Lock #####

##### 4.3.4.2 Fair Lock #####

##### 4.3.4.3 MultiLock #####

##### 4.3.4.4 RedLock #####

##### 4.3.4.5 ReadWriteLock #####

##### 4.3.4.6 Semaphore #####

##### 4.3.4.7 PermitExpirableSemaphore #####

##### 4.3.4.8 CountDownLatch #####

## 五、基于注解实现的 Redis 缓存 ##

### 5.1 Maven 和 YML 配置 ###

参考 RedisTemplate 配置

另外，还需要额外的配置类

// todo 定义序列化，解决乱码问题
    @EnableCaching
    @Configuration
    @ConfigurationProperties(prefix = "spring.cache.redis")
    public class RedisCacheConfig {
    
        private Duration timeToLive = Duration.ZERO;
    
        public void setTimeToLive(Duration timeToLive) {
            this.timeToLive = timeToLive;
        }
    
        @Bean
        public CacheManager cacheManager(RedisConnectionFactory factory) {
            RedisSerializer<String> redisSerializer = new StringRedisSerializer();
            Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
    
            // 解决查询缓存转换异常的问题
            ObjectMapper om = new ObjectMapper();
            om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
            om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
            jackson2JsonRedisSerializer.setObjectMapper(om);
    
            // 配置序列化（解决乱码的问题）
            RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                    .entryTtl(timeToLive)
                    .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                    .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
                    .disableCachingNullValues();
    
            RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
                    .cacheDefaults(config)
                    .build();
            return cacheManager;
        }
    
    }

### 5.2 使用示例 ###

@Transactional
    @Service
    public class ReImpl implements RedisService {
    
        @Resource
        private CustomerRepo customerRepo;
        @Resource
        private StringRedisTemplate stringRedisTemplate;
    
        public static final String REDIS_CUSTOMERS_ONE = "Customers";
    
        public static final String REDIS_CUSTOMERS_ALL = "allList";
    
        // =====================================================================使用Spring cahce 注解方式实现缓存
        // ==================================单个操作
    
        @Override
        @Cacheable(value = "cache:customer", unless = "null == #result",key = "#id")
        public CustomersEntity cacheOne(Integer id) {
            final Optional<CustomersEntity> byId = customerRepo.findById(id);
            return byId.isPresent() ? byId.get() : null;
        }
    
        @Override
        @Cacheable(value = "cache:customer", unless = "null == #result", key = "#id")
        public CustomersEntity cacheOne2(Integer id) {
            final Optional<CustomersEntity> byId = customerRepo.findById(id);
            return byId.isPresent() ? byId.get() : null;
        }
    
         // todo 自定义redis缓存的key,
        @Override
        @Cacheable(value = "cache:customer", unless = "null == #result", key = "#root.methodName + '.' + #id")
        public CustomersEntity cacheOne3(Integer id) {
            final Optional<CustomersEntity> byId = customerRepo.findById(id);
            return byId.isPresent() ? byId.get() : null;
        }
    
        // todo 这里缓存到redis，还有响应页面是String（加了很多转义符\,），不是Json格式
        @Override
        @Cacheable(value = "cache:customer", unless = "null == #result", key = "#root.methodName + '.' + #id")
        public String cacheOne4(Integer id) {
            final Optional<CustomersEntity> byId = customerRepo.findById(id);
            return byId.map(JSONUtil::toJsonStr).orElse(null);
        }
    
         // todo 缓存json，不乱码已处理好,调整序列化和反序列化
        @Override
        @Cacheable(value = "cache:customer", unless = "null == #result", key = "#root.methodName + '.' + #id")
        public CustomersEntity cacheOne5(Integer id) {
            Optional<CustomersEntity> byId = customerRepo.findById(id);
            return byId.filter(obj -> !StrUtil.isBlankIfStr(obj)).orElse(null);
        }
    
    
    
        // ==================================删除缓存
        @Override
        @CacheEvict(value = "cache:customer", key = "'cacheOne5' + '.' + #id")
        public Object del(Integer id) {
            // 删除缓存后的逻辑
            return null;
        }
    
        @Override
        @CacheEvict(value = "cache:customer",allEntries = true)
        public void del() {
    
        }
    
        @CacheEvict(value = "cache:all",allEntries = true)
        public void delall() {
    
        }
        // ==================List操作
    
        @Override
        @Cacheable(value = "cache:all")
        public List<CustomersEntity> cacheList() {
            List<CustomersEntity> all = customerRepo.findAll();
            return all;
        }
    
        // todo 先查询缓存，再校验是否一致，然后更新操作，比较实用，要清楚缓存的数据格式（明确业务和缓存模型数据）
        @Override
        @CachePut(value = "cache:all",unless = "null == #result",key = "#root.methodName")
        public List<CustomersEntity> cacheList2() {
            List<CustomersEntity> all = customerRepo.findAll();
            return all;
        }
    
    }

### 5.3 扩展 ###

基于 spring 缓存实现  
![6cc595748a421e76712c2cca7036837c.png][]

[de3b64c8b2cac14bfd0d655bfb4c7939.png]: /images/20220828/c1e5ab249b5e4d8eb8f13676cd2d5ac5.png
[117774661c08c9cb6047dd69a2071fd0.png]: /images/20220828/9eaeeb07b5744562be31dca5a7fd0753.png
[5c433e7fa4893fa15e218af9c90375a4.png]: /images/20220828/3c31edb6244b40319a66039a7018d327.png
[2292431c61b538f51eaca57573d0edd1.png]: /images/20220828/4405ec4eec2346e29b462fa27612ddfd.png
[f75986c6b020da5c15cad1784cb7b1b2.png]: /images/20220828/9dc208d79b4c4846ace5cf8e9032cd12.png
[6cc595748a421e76712c2cca7036837c.png]: /images/20220828/b7000fc5ebfa4380b644e4766e198088.png