Redis怎么存储对象

2023-08-12 19:14| 来源: 网络整理| 查看: 265

在以往面试中，多次被问到Redis怎么存储对象，我支支吾吾半天回答不上来，毕竟我只用过String类型，为了避免以后的尴尬，今天花点时间来整理一下。

本人用的Jedis客户端

首先引入依赖 redis.clients jedis 3.2.0 创建一个Jedis实例 package com.xiateng.util; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig; /** * jedis获取工具类 */ public class JedisUtil { private static JedisPool jedisPool; private static final Logger logger = LoggerFactory.getLogger(JedisUtil.class); static { // 初始化连接池 JedisPoolConfig jedisPoolConfig = new JedisPoolConfig(); jedisPoolConfig.setMaxTotal(20); jedisPoolConfig.setMaxIdle(10); jedisPool = new JedisPool(jedisPoolConfig, "127.0.0.1", 6379); logger.info("jedisPool连接池初始化====" + jedisPool); } /** * 获取一个Jedis实例 * @return */ public synchronized static Jedis getJedis(){ Jedis jedis = jedisPool.getResource(); // jedis.auth("123456");//密码 return jedis; } }

下面我们来实现存储对象

方式一：将对象转化为JSON字符串存入redis Jedis jedis = JedisUtil.getJedis(); TUser tUser = new TUser(); tUser.setUserName("你好"); tUser.setPassword("2342342"); jedis.set("xiateng", JSON.toJSONString(tUser)); String sss = jedis.get("xiateng"); TUser ssss = JSON.parseObject(sss,TUser.class); jedis.del("xiateng"); System.out.println("---------------------------: "+ssss.toString()); 方式二：将对象序列化后存到redis

封装序列化跟反序列化方法

package com.xiateng.util; import java.io.*; public class SerializeUtil { /** * 序列化操作 * @param object * @return */ public static byte[] serialize(Object object){ ObjectOutputStream oos = null; ByteArrayOutputStream baos = null; try { // 序列化 baos = new ByteArrayOutputStream(); oos = new ObjectOutputStream(baos); oos.writeObject(object); byte[] bytes = baos.toByteArray(); return bytes; } catch (IOException e) { e.printStackTrace(); } return null; } /** * 反序列化操作 * @param bytes * @return */ public static Object unSerialize(byte[] bytes){ ByteArrayInputStream bais = null; try { bais = new ByteArrayInputStream(bytes); ObjectInputStream ois = new ObjectInputStream(bais); return ois.readObject(); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } return null; } }

保存对象

Jedis jedis = JedisUtil.getJedis(); jedis.set("code".getBytes(), SerializeUtil.serialize(tUser)); byte[] bytes = jedis.get("code".getBytes()); TUser o = (TUser)SerializeUtil.unSerialize(bytes); jedis.del("code"); System.out.println(o.toString()); 方式三：将对象用Hash数据类型存储 Jedis jedis = JedisUtil.getJedis(); jedis.hset("user", "id", "3"); jedis.hset("user", "name", "xiateng"); jedis.hset("user", "password", "123455"); jedis.hget("user","id"); List user = jedis.hmget("user", new String[]{"id","name","password"}); System.out.println("---------------------------: "+user); // 输出结果 [3,xiateng,123455]

注意：以序列化的方式存储的对象需要实现 Serializable 接口

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Redis怎么存储对象

Redis怎么存储对象

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