学习 Redis Hash(哈希表)

最新推荐文章于 2025-05-20 18:24:14 发布

原创最新推荐文章于 2025-05-20 18:24:14 发布 · 2.1w 阅读

2 ·

CC 4.0 BY-SA版权

文章标签：

#NoSql #Redis

本文详细介绍了使用Java操作Redis Hash数据类型的方法，包括HSET、HEXISTS、HGET、HGETALL等命令的使用，以及如何进行HKEYS、HVALS、HDEL等高级操作，展示了完整的代码示例。

学习 Redis Hash(哈希表)

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.Cursor;
import org.springframework.data.redis.core.ScanOptions;
import org.springframework.data.redis.core.ScanOptions.ScanOptionsBuilder;

public class TestRedisHash {
	
	private static JedisConnectionFactory getJedisConnectionFactory() {
		JedisConnectionFactory jcf = new JedisConnectionFactory();
		jcf.setHostName("127.0.0.1");
		jcf.setPort(6379);
		jcf.setPassword("123");
		jcf.afterPropertiesSet();
		return jcf;
	}
	
	private static RedisConnection getRedisConnection() {
		return getJedisConnectionFactory().getConnection();
	}

	public static void main(String[] args) {
		RedisConnection rc = getRedisConnection();
		
		//HSET
		boolean hSet = rc.hSet("set1".getBytes(), "a".getBytes(), "b".getBytes());
		System.out.println(hSet);
		
		//HEXISTS
		boolean hExists = rc.hExists("set".getBytes(), "a".getBytes());
		System.out.println(hExists);
		
		//HGET
		byte[] hGet = rc.hGet("set".getBytes(), "a".getBytes());
		System.out.println(new String(hGet));
		
		//HGETALL
		Map<byte[], byte[]> hGetAll = rc.hGetAll("set".getBytes());
		Set<Entry<byte[], byte[]>> set = hGetAll.entrySet();
		Iterator<Entry<byte[], byte[]>> ite = set.iterator();
		while (ite.hasNext()) {
			Entry<byte[], byte[]> entry = ite.next();
			System.out.println(new String(entry.getKey()) + "  " + new String(entry.getKey()));
		}
		
		Set<byte[]> keySet = hGetAll.keySet();
		Iterator<byte[]> iter = keySet.iterator();
		while (iter.hasNext()) {
			byte[] key = iter.next();
			System.out.println(new String(key) + "  " + new String(hGetAll.get(key)));
		}
		
		//HKEYS
		Set<byte[]> hKeys = rc.hKeys("books".getBytes());
		Iterator<byte[]> itrKeys = hKeys.iterator();
		while (itrKeys.hasNext()) {
			System.out.println(new String(itrKeys.next()));
		}
		
		//HVALS
		List<byte[]> hVals = rc.hVals("books".getBytes());
		for (byte[] value : hVals) {
			System.out.println(new String(value));
		}
		
		//HDEL
		long hDel = rc.hDel("testdel".getBytes(), "a".getBytes());
		System.out.println(hDel);
		
		//HINCRBY 
		long hIncrBy = rc.hIncrBy("number".getBytes(), "b".getBytes(), 2);
		System.out.println(hIncrBy);
		
		//HINCRBYFLOAT
		double hIncrByFloat = rc.hIncrBy("dounum".getBytes(), "b".getBytes(), 2.0e2);
		System.out.println(hIncrByFloat);
		
		//HLEN
		long hLen = rc.hLen("seft".getBytes());
		System.out.println(hLen);
		
		//HMSET
		Map<byte[], byte[]> books = new HashMap<byte[], byte[]>();
		books.put("001".getBytes(), "Redis".getBytes());
		books.put("002".getBytes(), "Mongodb".getBytes());
		books.put("003".getBytes(), "Mysql".getBytes());
		rc.hMSet("books".getBytes(), books);
		
		//HMGET
		List<byte[]> hMget = rc.hMGet("books".getBytes(), "003".getBytes(), "002".getBytes(), "aa".getBytes());
		for (byte[] value : hMget) {
			if (value != null) {
				System.out.println(new String(value));
			}
		}
		
		//HSETNX
		boolean hSetNX = rc.hSetNX("setnx".getBytes(), "hello".getBytes(), "world".getBytes());
		System.out.println(hSetNX);
		
		//HSCAN
		ScanOptionsBuilder sob = ScanOptions.scanOptions().count(1).match("*1");
		ScanOptions options = sob.build();
		options.getCount();
		Cursor<Entry<byte[], byte[]>> hScan = rc.hScan("books".getBytes(), options);
		while (hScan.hasNext()) {
			Entry<byte[], byte[]> entry = hScan.next();
			System.out.println(new String(entry.getKey()) + "  " + new String(entry.getValue()));
		}
		
	}

}