Redis做缓存MySQL登录实现

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package com.mind.core.db;import com.mind.core.db.impl.CacheService;import com.mind.core.db.impl.DBService;import redis.clients.jedis.Jedis;import java.io.IOException;import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;/** * Created by Lovell on 16/6/22. */public class DaoTest {    public static void main(String[] args) throws IOException, SQLException {        Dao dao = new Dao();        dao.start();        String id="2";        String sql="select * from login where id='"+id+"'";        String name = null;        Jedis jedis = CacheService.getInstance().getJedisPool().getResource();        if(jedis.hexists("id"+id, "name")){            name = jedis.hget("id"+id, "name");            System.out.println("Welcome Redis! User "+ name +" login success");        }else{            Connection conn = DBService.getInstance().getConnection();            Statement statement = conn.createStatement();            ResultSet rs = statement.executeQuery(sql);            if(rs.next()==false){                System.out.println("MySQL no register, Please register first");            }else{                name = rs.getString("name");                System.out.println("Welcome MySQL ! User "+name+" login success");                jedis.hset("id"+id, "name", name);                // 十秒钟就过期                jedis.expire("id"+id, 10);            }        }    }}

  1. 用户登录首先判断是否在redis缓存中,如果在rRedis缓存中,直接登录成功;

  2. 若用户未在Redis缓存,则访问MySQL,判断用户是否存在,如果不存在,则提示用户注册;如果存在,则登录成功;

  3. 在MySQL存在并登录成功的同时,将改条数据用Redis Hash类型进行缓存,并设置过期时间为10秒;

  4. 设置Redis最大内存,若超出内存范围,则使用FIFO方式进行清除。

     在redis.conf文件中找到并设置即可:maxmemory  10240000



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