Redis存储对象
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
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<dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>3.2.0</version> </dependency> |
创建一个Jedis实例
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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
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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
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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
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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
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Jedis jedis = JedisUtil.getJedis();jedis.hset("user", "id", "3");jedis.hset("user", "name", "xiateng");jedis.hset("user", "password", "123455");jedis.hget("user","id");List<String> 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
Redis可以存储java对象吗
答案：是可以
但是你对象必须要序列化。
redis没有办法把一个没有序列化的对象存储到redis中。
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package com.kuangstudy.entiy;import lombok.Data;public class User implements java.io.Serializable{ private Integer id; private String nickname; private String password; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getNickname() { return nickname; } public void setNickname(String nickname) { this.nickname = nickname; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; }} |
这样太麻烦了，并且存储中文会有乱码，那如何解决呢？只能重新定义一个redisTemplate
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package com.kuangstudy.config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.data.redis.connection.RedisConnectionFactory;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;import org.springframework.data.redis.serializer.StringRedisSerializer;@Configurationpublic class RedisConfiguration { /** * @return org.springframework.data.redis.core.RedisTemplate<java.lang.String, java.lang.Object> * @Author 徐柯 * @Description 改写redistemplate序列化规则 * @Date 13:20 2021/5/20 * @Param [redisConnectionFactory] **/ @Bean public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) { RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>(); redisTemplate.setConnectionFactory(redisConnectionFactory); // 创建一个json的序列化方式 GenericJackson2JsonRedisSerializer jackson2JsonRedisSerializer = new GenericJackson2JsonRedisSerializer(); // 设置value用jackjson进行处理 redisTemplate.setValueSerializer(jackson2JsonRedisSerializer); // 设置key用string序列化方式 redisTemplate.setKeySerializer(new StringRedisSerializer()); redisTemplate.setHashKeySerializer(new StringRedisSerializer()); redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer); redisTemplate.afterPropertiesSet(); return redisTemplate; }} |
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_43037478/article/details/112580631
