Redis使用RedisTemplate模板类的常用操作方式

RedisTemplate是Spring框架提供的一个用于操作Redis的模板类，它提供了丰富的API，可以方便地进行Redis的操作。常用的操作方式包括：

连接Redis服务器

在使用Redis时，首先需要创建RedisTemplate对象，并设置连接工厂。连接工厂分为JedisConnectionFactory和LettuceConnectionFactory两种，本例中我们使用JedisConnectionFactory。

@Configuration
public class RedisConfig {
    @Bean(name = "redisTemplate")
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setConnectionFactory(connectionFactory);
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        return template;
    }

    @Bean
    public JedisConnectionFactory redisConnectionFactory() {
        JedisConnectionFactory factory = new JedisConnectionFactory();
        factory.setHostName("127.0.0.1");
        factory.setPort(6379);
        return factory;
    }
}

添加、获取数据

• 添加数据

@Autowired
RedisTemplate<String, Object> redisTemplate;

public void addData(String key, Object value) {
    redisTemplate.opsForValue().set(key, value);
}

• 获取数据

@Autowired
RedisTemplate<String, Object> redisTemplate;

public Object getData(String key) {
    return redisTemplate.opsForValue().get(key);
}

删除数据

@Autowired
RedisTemplate<String, Object> redisTemplate;

public void deleteData(String key) {
    redisTemplate.delete(key);
}

操作Hash

• 添加Hash数据

@Autowired
RedisTemplate<String, Object> redisTemplate;

public void addHashData(String key, String hashKey, Object value) {
    redisTemplate.opsForHash().put(key, hashKey, value);
}

• 获取Hash数据

@Autowired
RedisTemplate<String, Object> redisTemplate;

public Object getHashData(String key, String hashKey) {
    return redisTemplate.opsForHash().get(key, hashKey);
}

• 删除Hash数据

@Autowired
RedisTemplate<String, Object> redisTemplate;

public void deleteHashData(String key, String hashKey) {
    redisTemplate.opsForHash().delete(key, hashKey);
}

以上是RedisTemplate使用的常用操作，下面是两个示例：

示例一：添加、获取数据

@Service
public class RedisService {
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    public void setData(String key, String value) {
        redisTemplate.opsForValue().set(key, value);
    }

    public String getData(String key) {
        return (String)redisTemplate.opsForValue().get(key);
    }
}

// controller
@RestController
public class RedisController {
    @Autowired
    private RedisService redisService;

    @GetMapping("/addData")
    public String addData(String key, String value) {
        redisService.setData(key, value);
        return "success";
    }

    @GetMapping("/getData")
    public String getData(String key) {
        return redisService.getData(key);
    }
}

示例二：操作Hash

@Service
public class RedisService {
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    public void setHashData(String key, String hashKey, String value) {
        redisTemplate.opsForHash().put(key, hashKey, value);
    }

    public String getHashData(String key, String hashKey) {
        return (String)redisTemplate.opsForHash().get(key, hashKey);
    }
}

// controller
@RestController
public class RedisController {
    @Autowired
    private RedisService redisService;

    @GetMapping("/setHashData")
    public String setHashData(String key, String hashKey, String value) {
        redisService.setHashData(key, hashKey, value);
        return "success";
    }

    @GetMapping("/getHashData")
    public String getHashData(String key, String hashKey) {
        return redisService.getHashData(key, hashKey);
    }
}