Redis怎么存储对象

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Redis存储对象

首先引入依赖

        <dependency>            <groupId>redis.clients</groupId>            <artifactId>jedis</artifactId>            <version>3.2.0</version>        </dependency>

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; 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);    }         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 {         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;    }         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<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。

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

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 {        @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;    }}

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