Spring Data Redis入门示例：字符串操作

Posted 2020-10-22 王小帅

Spring Data Redis对字符串的操作，封装在了ValueOperations和BoundValueOperations中，在集成好了SPD之后，在需要的地方引入：

// 注入模板操作实例
@Autowired
private RedisTemplate template;

// 从模板中取出对应的操作类实例
@Resource(name = "redisTemplate")
private ValueOperations valueOps;

由于存储在Redis中的键和值通常是java.lang.String，因此Redis模块为RedisConnection和RedisTemplate提供了两个扩展，分别是StringRedisConnection（及其DefaultStringRedisConnection实现）和StringRedisTemplate(相当于RedisTemplate<String, String>)。

org.springframework.data.redis.core.StringRedisTemplate源码如下：

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);
}

/**
 * Constructs a new <code>StringRedisTemplate</code> instance ready to be used.
 * 
 * @param connectionFactory connection factory for creating new connections
 */
public StringRedisTemplate(RedisConnectionFactory connectionFactory) {
    this();
    setConnectionFactory(connectionFactory);
    afterPropertiesSet();
}

protected RedisConnection preProcessConnection(RedisConnection connection, boolean existingConnection) {
    return new DefaultStringRedisConnection(connection);
}
}

实际就是继承自RedisTemplate