深入学习 Redis - 基于 Spring Data Redis 操作 Redis

太过爱你忘了你带给我的痛 2024-03-22 22:51 28阅读 0赞

**目录**

一、前置工作

1.1、引入 Spring Data Redis 依赖

1.2、编写配置文件

二、Spring Data Redis

2.1、前置知识

2.2、演示 Demo

--------------------

## 一、前置工作 ##

--------------------

### 1.1、引入 Spring Data Redis 依赖 ###

![e7fca4e4512244408dac1067843f54d3.png][]

### 1.2、编写配置文件 ###

spring:
        redis:
            host: 127.0.0.1
            port: 8888

## 二、Spring Data Redis ##

--------------------

### 2.1、前置知识 ###

之前使用 Jedis 是通过 Jedis 对象里的各种方法来操作 redis 的，此处 Spring 则是通过 SpringRedisTemplate 来操作 redis.

**最原始的提供类是 RedisTemplate ，SpringRedisTemplate 是 RedisTemplate 的子类，专门用来处理文本数据的，相比于 Jedis ，还是存在较大差异的**，如下：

![9f936d1affdb4c97820e89502cbb53dc.png][]

RedisTemplate 是把 Redis 的方法，分成了几个类别来进行组织，和原生的 Redis 命令有一定的差异~ 作者的初心是希望通过上述封装，让接口看起来更简单，但在我看来，并没有达成，反而因为与 Redis 原生命令差异，提高了使用者的学习成本.

值得注意的是， RedisTemplate 留了一个后手，让我们能随时执行到 Redis 原生的命令 ——execute方法：

![64aa34f5d25d4ffbacede6ce15eb3639.png][]

这里的 RedisConnection 就代表了 Redis 连接，对标 Jedis 对象

> Ps：execute 要求回调方法中必须写 return 语句，这个回调的对象，就会作为 execute 本身的返回值.

### 2.2、演示 Demo ###

这里 redis 测试的各种方法，都是通过 Controller 提供的 http 接口来触发的.

@RestController
    @RequestMapping("/redis")
    public class RedisController {
    
        @Autowired
        private StringRedisTemplate redisTemplate;
    
        @RequestMapping("/string")
        public String testString() {
            redisTemplate.execute((RedisConnection connection) -> {
                connection.flushAll();
                return null;
            });
            redisTemplate.opsForValue().set("key1", "111");
            redisTemplate.opsForValue().set("key2", "222");
            redisTemplate.opsForValue().set("key3", "333");
    
            //设置 30 分钟超时时间
            redisTemplate.opsForValue().set("key4", "444", 30, TimeUnit.SECONDS);
    
    
            String value1 = redisTemplate.opsForValue().get("key2");
            String value2 = redisTemplate.opsForValue().get("key100");
    
            System.out.println("--------------------------------");
            System.out.println("value1: " + value1);
            System.out.println("value2: " + value2);
    
            return "OK";
        }
    
        @RequestMapping("/hash")
        public String testHash() {
            redisTemplate.execute((RedisConnection connection) -> {
                connection.flushAll();
                return null;
            });
    
            redisTemplate.opsForHash().put("key1", "f1", "v1");
            redisTemplate.opsForHash().put("key1", "f2", "v2");
            redisTemplate.opsForHash().put("key1", "f3", "v3");
    
            String value1 = (String) redisTemplate.opsForHash().get("key1", "f1");
            String value2 = (String) redisTemplate.opsForHash().get("key1", "f2");
    
            System.out.println("--------------------------------");
            System.out.println("value1: " + value1);
            System.out.println("value2: " + value2);
    
            redisTemplate.opsForHash().delete("key1",  "f1", "f2");
    
            Long size = redisTemplate.opsForHash().size("key1");
            System.out.println("size: " + size);
            return "OK";
        }
    
        @RequestMapping("/list")
        public String testList() {
            redisTemplate.execute((RedisConnection connection) -> {
                connection.flushAll();
                return null;
            });
    
            redisTemplate.opsForList().leftPush("key1", "111");
            redisTemplate.opsForList().leftPush("key1", "222");
            redisTemplate.opsForList().leftPush("key1", "333");
    
            String value1 = redisTemplate.opsForList().rightPop("key1");
            String value2 = redisTemplate.opsForList().rightPop("key1");
            String value3 = redisTemplate.opsForList().rightPop("key1");
    
            System.out.println("--------------------------------");
            System.out.println("value1: " + value1);
            System.out.println("value2: " + value2);
            System.out.println("value3: " + value3);
    
            return "OK";
        }
    
        @RequestMapping("/set")
        public String testSet() {
            System.out.println("--------------------------------");
            redisTemplate.execute((RedisConnection connection) -> {
                connection.flushAll();
                return null;
            });
    
            redisTemplate.opsForSet().add("key1", "111", "222", "333");
            Set<String> result = redisTemplate.opsForSet().members("key1");
            System.out.println("result: " + result);
    
            Boolean exists = redisTemplate.opsForSet().isMember("key1", "111");
            System.out.println("exists: " + exists);
    
            Long count = redisTemplate.opsForSet().size("key1");
            System.out.println("count: " + count);
    
            redisTemplate.opsForSet().remove("key", "111", "222");
            result = redisTemplate.opsForSet().members("key1");
            System.out.println("result: " + result);
            return "OK";
        }
    
        @RequestMapping("/zset")
        public String testZset() {
            redisTemplate.execute((RedisConnection connection) -> {
                connection.flushAll();
                return null;
            });
    
            redisTemplate.opsForZSet().add("key1", "f1", 100);
            redisTemplate.opsForZSet().add("key1", "f2", 200);
            redisTemplate.opsForZSet().add("key1", "f3", 300);
    
            Set<String> members = redisTemplate.opsForZSet().range("key1", 0 ,-1);
            Set<ZSetOperations.TypedTuple<String>> membersWithScore = redisTemplate.opsForZSet().rangeByScoreWithScores("key", 0 , -1);
            Double score = redisTemplate.opsForZSet().score("key1", "f1");
            Long size = redisTemplate.opsForZSet().remove("key1", "f1");
            Long rank = redisTemplate.opsForZSet().rank("key1", "f2");
    
            System.out.println("--------------------------------");
            System.out.println("members: " + members);
            System.out.println("membersWithScores: " + membersWithScore);
            System.out.println("score: " + score);
            System.out.println("size: " + size);
            System.out.println("rank: " + rank);
    
            return "OK";
        }
    
    }

![e4ca3d19c78a453b8a63a48855a937cc.png][]

[e7fca4e4512244408dac1067843f54d3.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/36b4537d522847e1a6f9ac5834af1a6b.png
[9f936d1affdb4c97820e89502cbb53dc.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/f9673d50a4bc4a20bb7bef73fffdefb2.png
[64aa34f5d25d4ffbacede6ce15eb3639.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/d3149cba7bb54876a7c52f20249ae3b5.png
[e4ca3d19c78a453b8a63a48855a937cc.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/0cdf36f2f567409ea5a791f6c8648514.png