java操作Redis

Posted 2020-08-19 胖头猫

需要使用如下jar包
　　　　<!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.8.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-pool/commons-pool -->
        <dependency>
            <groupId>commons-pool</groupId>
            <artifactId>commons-pool</artifactId>
            <version>1.6</version>
        </dependency>

 

 

1.建立连接池

 

package com.spring.wzy;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class JedisPoolUtil {
    
    /**
     * 双重锁形式的单例
     * */
    private static volatile JedisPool jedisPool = null;    
    
    private JedisPoolUtil(){}
    
    public static JedisPool getJedisPoolInstance(){
        if(null == jedisPool){
            synchronized (JedisPoolUtil.class) {
                if(null == jedisPool){
                //    GenericObjectPoolConfig poolConfig = new JedisPoolConfig();
                    JedisPoolConfig poolConfig = new JedisPoolConfig();
                   // poolConfig.setMaxActive(1000);//最大实例数
                    poolConfig.setMaxWaitMillis(100*1000);//最大等待时间
                    poolConfig.setMaxIdle(50);//最多空闲实例
                    poolConfig.setTestOnBorrow(true);//获得一个实例时检查连接可用性
                    jedisPool = new JedisPool(poolConfig, "192.168.23.128", 6379);
                }
            }
        }
        return jedisPool;
    }
    
    public static void release(JedisPool jedisPool, Jedis jedis){
        if(null != jedis){
            //jedis.close();
            jedisPool.returnResourceObject(jedis);
        }
    }
}

2.使用实例

 

public static void main(String[] args) throws InterruptedException {
        JedisPool jedisPool = JedisPoolUtil.getJedisPoolInstance();
        Jedis j = null;
        try{
             j = jedisPool.getResource();
    //        j.select(0);//选中数据库，默认是0号库
//        j.flushAll();//清空数据库
        
//        j.del("key"); //删除key
    
//        j.set("k1", "v1");
//        j.set("k2", "v2");
//        j.set("k2", "v3");//新值会把旧值覆盖
        
//        System.out.println(j.exists("k2"));//返回ture/false
//        System.out.println(j.exists("k1","k3"));//返回存在的个数
        
//        System.out.println(new String(j.get("k1".getBytes())));
//        System.out.println(j.get("k2"));
        
//        Set<String> keys = j.keys("*");
//        for(String k:keys){
//            System.out.println(k);
//        }
        
//        j.move("k1", 2);//把k1剪切到2号库
        
//        System.out.println(j.expire("k2", 10));//设置key的存活时间（s），执行成功返回1，否则返回0
//        Thread.sleep(3000);
//        System.out.println(j.ttl("k2"));//查看key的过期时间        


        }catch (Exception e) {
            e.printStackTrace();
        }finally{
            JedisPoolUtil.release(jedisPool, j);
        }