How to quickly import millions of key data to Redis in Java

In Java, you can use Redisson, an open source Java
Redis client library, to quickly import millions of key data to Redis. Redisson is a Redis-based Java object and service framework that provides a convenient way to manipulate Redis data.

The following are the steps to quickly import millions of key data to Redis using Redisson:

1. First, you need to add Redisson dependencies to the project. The following dependencies can be added to the pom.xml file:

<dependency>  
    <groupId>org.redisson</groupId>  
    <artifactId>redisson</artifactId>  
    <version>3.16.1</version>  
</dependency>

1. Create a Redisson client object to connect to the Redis server. A client object can be created with the following code:

Config config = new Config();  
config.useSingleServer().setAddress("redis://localhost:6379");  
RedissonClient redisson = Redisson.create(config);

1. Add data to Redis. Data can be added to Redis using the following code:

RScoredMap<String, String> scoreMap = redisson.getMap("scoreMap");  
scoreMap.put("key1", "value1");  
scoreMap.put("key2", "value2");  
scoreMap.put("key3", "value3");

The RScoredMap type is used here to save the key corresponding to the score, and then add the data to the corresponding key-value pair.

1. Import Data. Data can be imported into Redis using the following code

RScoredMap<String, String> scoreMap = redisson.getMap("scoreMap");  
ScoreMap<String, String> result = new ScoreMap<>(scoreMap.getBucketNum("", true),  
                                                  scoreMap.getKeyType(),  
                                                  scoreMap.getValueType());

Here, the ScoreMap type is used to store the key corresponding to the score, and then the corresponding key-value pair result is created according to the score type and value type.

1. Query data. The data can be queried using the following code:

RScoredMap<String, String> scoreMap = redisson.getMap("scoreMap");  
ScoreMap<String, String> result = scoreMap.getBucket("", true);  
for (ScoreMap.Entry<String, String> entry : result.entrySet()) {
    
      
    String key = entry.getKey();  
    String value = entry.getValue();  
    System.out.println(key + " : " + value);  
}

Here the getBucket method is used to obtain the bucket corresponding to the score, and then traverse all entries in the bucket to obtain the corresponding key and value and output

。

• The above are the steps to use Redisson to quickly import millions of key data to Redis. It should be noted that in practical applications, it may be necessary to select an appropriate paradigm according to the specific situation to ensure the quality and performance of the database