首先时我们需要一个序列化工具类

package com.aw.redisdemo.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

/**
 * 序列化工具
 */
public class SerializeUtil {

    /**
     * 将java对象转换为byte数组 序列化过程
     */

    public static byte[] serialize(Object object) {
        ObjectOutputStream oos = null;
        ByteArrayOutputStream baos = null;
        try {
            baos=new ByteArrayOutputStream();
            oos=new ObjectOutputStream(baos);
            oos.writeObject(object);
            byte[] bytes = baos.toByteArray();
            return bytes;

        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 将byte数组转化为java对象
     * @param bytes
     * @return
     */

    public static Object unserialize(byte[] bytes){
        if (bytes==null) return null;

        ByteArrayInputStream bais=null;
        try{
           bais =new ByteArrayInputStream(bytes);
            ObjectInputStream objectInputStream = new ObjectInputStream(bais);
            return objectInputStream.readObject();
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }

}

实体类

package com.aw.redisdemo.pojo;

import java.io.Serializable;

public class User implements Serializable {
    private static final long serialVersionUID= 9148937431079191022L;
    private Integer id;
    private String username;
    private String password;


    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

package com.aw.redisdemo;

import com.aw.redisdemo.pojo.User;
import com.aw.redisdemo.util.SerializeUtil;
import org.junit.After;
import org.junit.Before;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.Transaction;
import redis.clients.jedis.params.SetParams;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;


@SpringBootTest
@RunWith(SpringRunner.class)
class RedisDemoApplicationTests {
  @Autowired
    private  JedisPool jedisPool;
    private Jedis jedis=null;

    //初始化jedis实例对象
   @BeforeEach
   public void initConnt(){
       jedis = jedisPool.getResource();

    }

    @Test
    public void testByte(){
        User user = new User();
        user.setId(2);
        user.setUsername("阿威");
        user.setPassword("123445");
        //序列化为byte数组
        byte[] userKey = SerializeUtil.serialize("user:"+user.getId());
        byte[] userValue = SerializeUtil.serialize(user);
        //存入redis
        jedis.set(userKey,userValue);

        //取出数据
        byte[] bytes = jedis.get(userKey);
        User unserialize = (User) SerializeUtil.unserialize(bytes);
        System.out.println(unserialize);
    }


    //释放资源
    @AfterEach
    public void closeConnt(){
        if (jedis!=null){
            jedis.close();
        }
    }
}