如何使用Redis模板从Redis获取所有密钥

问题描述

我一直困扰这个问题很长时间，我想使用Redis模板从Redis获取密钥.我尝试过this.redistemplate.keys("*");但这什么也没得到.即使使用该模式也不起作用.

I have been stuck with this problem with quite some time.I want to get keys from redis using redis template.I tried this.redistemplate.keys("*");but this doesn't fetch anything. Even with the pattern it doesn't work.

请问什么是最好的解决方案.

Can you please advise on what is the best solution to this.

推荐答案

我刚刚合并了答案，我们已经在这里看到了.

I just consolidated the answers, we have seen here.

当我们使用RedisTemplate时，有两种从Redis获取密钥的方法.

Here are the two ways of getting keys from Redis, when we use RedisTemplate.

1.直接来自RedisTemplate

Set<String> redisKeys = template.keys("samplekey*"));
// Store the keys in a List
List<String> keysList = new ArrayList<>();
Iterator<String> it = redisKeys.iterator();
while (it.hasNext()) {
       String data = it.next();
       keysList.add(data);
}

注意:您应该在bean

Note: You should have configured redisTemplate with StringRedisSerializer in your bean

如果您使用基于Java的bean配置

redisTemplate.setDefaultSerializer(new StringRedisSerializer());

如果您使用基于spring.xml的bean配置

<bean id="stringRedisSerializer" class="org.springframework.data.redis.serializer.StringRedisSerializer"/>

<!-- redis template definition -->
<bean
    id="redisTemplate"
    class="org.springframework.data.redis.core.RedisTemplate"
    p:connection-factory-ref="jedisConnectionFactory"
    p:keySerializer-ref="stringRedisSerializer"
    />

2.来自JedisConnectionFactory

RedisConnection redisConnection = template.getConnectionFactory().getConnection();
Set<byte[]> redisKeys = redisConnection.keys("samplekey*".getBytes());
List<String> keysList = new ArrayList<>();
Iterator<byte[]> it = redisKeys.iterator();
while (it.hasNext()) {
       byte[] data = (byte[]) it.next();
       keysList.add(new String(data, 0, data.length));
}
redisConnection.close();

如果您未明确关闭此连接，则会耗尽基础jedis连接池，如 https://stackoverflow.com/a/36641934/3884173 .

If you don't close this connection explicitly, you will run into an exhaustion of the underlying jedis connection pool as said in https://stackoverflow.com/a/36641934/3884173.

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