在java中操作Redis

Redis的Java客户端

Redis 的 Java 客户端很多，常用的几种:

Jedis

Lettuce

Spring Data Redis

Spring Data Redis 是 Spring 的一部分，对 Redis 底层开发包进行了高度封装。

在 Spring 项目中，可以使用Spring Data Redis来简化操作。

Spring Data Redis使用方式

1.导入Spring Data Redis 的maven坐标

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

2.配置Redis数据源

spring:
  data:
    redis:
      host: localhost
      port: 6379
      password: root
      database: 0

3.编写配置类，创建RedisTemplate对象

    @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory){
        RedisTemplate redisTemplate = new RedisTemplate();
        //设置redis的连接工厂对象
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        //设置redis key的序列化器
        redisTemplate.setKeySerializer(new StringRedisSerializer());

        return redisTemplate;
    }

4.通过RedisTemplate对象操作Redis

    @Autowired
    private RedisTemplate redisTemplate; 

    @Test
    public void contextLoads() {
        //得到对应操作5种redis数据类型的对象
        ValueOperations valueOperations = redisTemplate.opsForValue();
        HashOperations hashOperations = redisTemplate.opsForHash();
        ListOperations listOperations = redisTemplate.opsForList();
        SetOperations setoperations =redisTemplate.opsForSet();
        ZSetOperations zSetOperations =redisTemplate.opsForZSet();
    }

字符串类型操作

 

    /**
     * 操作字符串类型的数据
     */
    @Test
    public void testString(){
        //set
        redisTemplate.opsForValue().set("city","北京");
        //get
        String city = (String) redisTemplate.opsForValue().get("city");
        System.out.println("city = " + city);
        //setex
        redisTemplate.opsForValue().set("code","1234",4, TimeUnit.MINUTES);
        //setnx
        redisTemplate.opsForValue().setIfAbsent("lock","1");
        redisTemplate.opsForValue().setIfAbsent("lock","2");
    }

哈希类型操作

    /**
     * 操作哈希类型的数据
     */
    @Test
    public void testHash(){
        HashOperations hashOperations = redisTemplate.opsForHash();

        //hset
        hashOperations.put("100","name","tom");
        hashOperations.put("100","age","20");

        //hget
        String name = (String) hashOperations.get("100", "name");
        System.out.println("name = " + name);

        //hkeys
        Set keys = hashOperations.keys("100");
        System.out.println("keys = " + keys);

        //hvals
        List values = hashOperations.values("100");
        System.out.println("values = " + values);

        //hdel
        hashOperations.delete("100", "age");
    }

列表类型操作

    /**
     * 操作列表类型的数据
     */
    @Test
    public void testList() {
        //lpush lrange rpop llen
        ListOperations listOperations = redisTemplate.opsForList();
        //lpush
        listOperations.leftPushAll("mylist", "a", "b", "c");
        listOperations.leftPush("mylist", "d");

        //lrange
        List mylist = listOperations.range("mylist", 0, -1);
        System.out.println(mylist);

        //llen
        Long size = listOperations.size("mylist");
        System.out.println(size);

        //rpop
        listOperations.rightPop("mylist");
    }

集合类型操作

 

    /**
     * 操作集合类型的数据
     */
    @Test
    public void testset() {
        //sadd smembers scard sinter sunion srem
        SetOperations setOperations = redisTemplate.opsForSet();
        //sadd 添加
        setOperations.add("set1", "a", "b", "c", "d");
        setOperations.add("set2", "a", "b", "x", "y");

        //smembers 返回集合中所有元素
        Set members = setOperations.members("set1");
        System.out.println(members);

        //scard 获取集合的成员数
        Long size = setOperations.size("set1");
        System.out.println(size);

        //sinter 返回给定所有集合的交集
        Set intersect = setOperations.intersect("set1", "set2");
        System.out.println(intersect);

        //sunion 返回给定所有集合的并集
        Set union = setOperations.union("set1", "set2");
        System.out.println(union);

        //srem 删除集合中一个或多个成员
        setOperations.remove("set1", "a", "b");
    }

 有序集合类型操作

 

    /**
     * 操作有序集合类型的数据
     */
    @Test
    public void testZset() {
        //zadd zrange zincrby zrem
        ZSetOperations zSetOperations = redisTemplate.opsForZSet();

        //zadd 添加
        zSetOperations.add("zset1", "a", 10);
        zSetOperations.add("zset1", "b", 12);
        zSetOperations.add("zset1", "c", 9);

        //zrange 获取区间内的元素
        Set zset1 = zSetOperations.range("zset1", 0, -1);
        System.out.println(zset1);

        //zincrby 有序集合中对指定成员的分数加上增量
        zSetOperations.incrementScore("zset1", "c", 10);

        //zrem 删除
        zSetOperations.remove("zset1", "a", "b");
    }

通用命令

    /**
     * 通用命令操作
     */
    @Test
    public void testcommon() {
        //keys exists type del

        //keys
        Set keys = redisTemplate.keys("*");
        System.out.println(keys);

        //exists
        Boolean name = redisTemplate.hasKey("name");
        Boolean set1 = redisTemplate.hasKey("set1");
        System.out.println("name = " + name);
        System.out.println("set1 = " + set1);
        //type
        for (Object key : keys) {
            DataType type = redisTemplate.type(key);
            System.out.println(type.name());
        }

        //del
        redisTemplate.delete("mylist");
    }