redis中的数据结构基本的操作

复习一下redis中的各个数据结构的基本操作

当然后首先要引入redis的包

package com.jedis;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Set;

import redis.clients.jedis.Jedis;

import redis.clients.jedis.JedisPool;

import redis.clients.jedis.JedisPoolConfig;

public class JedisUtil {

private JedisPool jedisPool;

private Jedis jedis;

public JedisUtil() {

jedisPool = new JedisPool(new JedisPoolConfig(), "127.0.0.1");

jedis = jedisPool.getResource();

}

public Jedis getJedis() {

return this.jedis;

}

public static void main(String[] args) {

// manipulate String crud

JedisUtil jedisUtil = new JedisUtil();

Jedis jedis = jedisUtil.getJedis();

jedis.set("hello", "world");

System.out.println(jedis.get("hello"));

jedis.append("hello", " hello world!");

System.out.println(jedis.get("hello"));

jedis.set("hello", "hello");

System.out.println(jedis.get("hello"));

jedis.del("hello");

System.out.println(jedis.get("hello"));

// manpulate map

Map<String, String> map = new HashMap<String, String>();

map.put("a", "1");

map.put("b", "2");

map.put("c", "3");

jedis.hmset("user", map);

System.out.println(jedis.hmget("user", "a", "b", "c"));

// the result is generic type list

List<String> list = jedis.hmget("user", "a", "b", "c");

System.out.println(list.size());

// delet a key-value

jedis.hdel("user", "a");

System.out.println(jedis.hmget("user", "a"));// null

System.out.println(jedis.hlen("user"));// 2

System.out.println(jedis.exists("user"));// true

System.out.println(jedis.hkeys("user"));

Set<String> keys = jedis.hkeys("user");

for (String string : keys) {

System.out.println(string);

}

System.out.println(jedis.hvals("user"));

List<String> vals = jedis.hvals("user");

for (String string : vals) {

System.out.println(string);

}

// manipulate list

jedis.del("fruits");

System.out.println(jedis.lrange("fruits", 0, -1));

jedis.lpush("fruits", "apple");

jedis.lpush("fruits", "banana");

jedis.lpush("fruits", "orange");

System.out.println(jedis.lrange("fruits", 0, -1));

// manipulate set

jedis.sadd("sname", "jack", "tom", "rose");

System.out.println(jedis.smembers("sname"));

Set<String> smembers = jedis.smembers("sname");// return a set

// remove a value

// jedis.srem("sname", "jack");

System.out.println(jedis.smembers("sname"));

// value is a member of set

System.out.println(jedis.sismember("sname", "jack"));// false

// return a random element from a Set

System.out.println(jedis.srandmember("sname"));

// return the set cardinality(number of the elements)

System.out.println(jedis.scard("sname"));

// others

System.out.println(jedis.keys("*"));

System.out.println(jedis.keys("*name"));

// System.out.println(jedis.del("sname"));

System.out.println(jedis.del("ssname"));

/*

* The TTL command returns the remaining time to live in seconds of a

* key that has an EXPIRE set. This introspection capability allows a

* Redis client to check how many seconds a given key will continue to

* be part of the dataset.

* Integer reply, returns the remaining time to

* live in seconds of a key that has an EXPIRE. If the Key does not

* exists or does not have an associated expire, -1 is returned

*/

System.out.println(jedis.ttl("sname"));

jedis.setex("timekey", 8, "min");//set the expirtation of the key

try {

Thread.sleep(5000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println(jedis.ttl("timekey"));//3

jedis.setex("timekey", 1, "min");

System.out.println(jedis.ttl("timekey"));

System.out.println(jedis.exists("time"));

System.out.println(jedis.rename("timekey", "time"));

System.out.println(jedis.get("timekey"));

System.out.println(jedis.get("time"));

//jedis sort

jedis.del("arr");

jedis.rpush("arr", "3");

jedis.lpush("arr", "2");

jedis.lpush("arr", "4");

jedis.lpush("arr", "1");

System.out.println(jedis.lrange("arr", 0, -1));

System.out.println(jedis.sort("arr"));

System.out.println(jedis.lrange("arr", 0, -1));

}

}