使用Redis脚本做缓存的小案例

最新推荐文章于 2025-07-07 12:18:31 发布

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最新推荐文章于 2025-07-07 12:18:31 发布

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分类专栏： Redis

本文链接：https://blog.youkuaiyun.com/lyzx_in_csdn/article/details/79398963

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本文介绍了一个使用Redis作为缓存数据库的应用案例。通过将常用数据存储于Redis中，提高数据访问速度。具体实现包括数据输入、存储及检索等功能。

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package com.lyh.redis.test;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import org.junit.Test;
import com.alibaba.fastjson.JSON;
import redis.clients.jedis.Jedis;

/**
* 一个缓存的小案例
* 即把经常用到的数据放入缓存中(Redis数据库中)
* @author MECHREVO
*/
public class SingleRedisTest3 {
    private Jedis j = init(); ;
    private final String APPLES = "APPLES";
    private final String SWEET = "SWEET"; //含糖量为1的代表甜的
    private final String RED = "RED"; //颜色为A和B 代表红

    public Jedis init(){
        //一个Jedis对象对应这个一个Redis的实例
        Jedis jedis = new Jedis("192.168.29.160",6379);
        return jedis;
    }

    public void destroy(Jedis j){
        //在关闭时断开连接，测试发现在操作之前调用这个方法后Jedis实例依然可以使用
        j.disconnect();
    }

    @Test
    public void dataInput(){
        Map<String,String> apples = new HashMap<String,String>();
        //id,name,price,color,sweet
        String id1 = UUID.randomUUID().toString();
        Apple a1 = new Apple(id1,"X",100,"A","1");
        apples.put(id1, JSON.toJSONString(a1));
        j.sadd(SWEET,id1);
        j.sadd(RED,id1);

        String id2 = UUID.randomUUID().toString();
        Apple a2 = new Apple(id2,"Y",200,"B","1");
        apples.put(id2, JSON.toJSONString(a2));
        j.sadd(SWEET,id2);
        j.sadd(RED,id2);


        String id3 = UUID.randomUUID().toString();
        Apple a3 = new Apple(id3,"Z",200,"C","1");
        apples.put(id3, JSON.toJSONString(a3));
        j.sadd(SWEET,id3);

        String id4 = UUID.randomUUID().toString();
        Apple a4 = new Apple(id4,"Y",200,"C","4");
        apples.put(id4, JSON.toJSONString(a4));

        String id5 = UUID.randomUUID().toString();
        Apple a5 = new Apple(id5,"K",100,"A","4");
        apples.put(id5,JSON.toJSONString(a5));
        j.sadd(RED,id5);

        j.hmset(APPLES, apples);
    }


    @Test
    public void getApples(){
      //找出既是红色有很甜的苹果  select * from apples where (color='A' or color ='B' ) and sweet = '1'

        Set<String> redAndSweet = j.sinter(RED,SWEET);
        String[] array = redAndSweet.toArray(new String[1]);

        List<String> rAndS = j.hmget(APPLES, array);
        for(String v : rAndS){
            System.out.println(v);
        }
    }
}

class Apple{
    private String id;
    //名字
    private String name;
    //价钱
    private int price;
    //颜色等级 A B C D
    private String color;
    //含糖量 1 2 3 4
    private String sweet;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    public String getColor() {
        return color;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public String getSweet() {
        return sweet;
    }
    public void setSweet(String sweet) {
        this.sweet = sweet;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public Apple(String id, String name, int price, String color, String sweet) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
        this.color = color;
        this.sweet = sweet;
    }
    public Apple() {
        super();
    }


}