Mysql + Redis實現排行榜實戰（讓Redis做好自己的事情）

1)pom.xml

   <dependencies>
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.18</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.9.0</version>
        </dependency>

    </dependencies>

2)druid.properties連接池配置

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql:///db_mysql_redis_rank
username=root
password=jianan
initialSize=10
maxActive=20
maxWait=3000

3)jedis.properties

host=127.0.0.1
port=6379
maxTotal=50
maxIdle=10

4)數據庫內容

5)JDBCUtils.java

package Demo03.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JDBCUtils {
    private static DataSource ds;

    static {
        try {
            Properties pro = new Properties();
            pro.load(JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    public static DataSource getDataSource() {
        return ds;
    }

    public static void close(ResultSet rs, Statement stmt, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                // 歸還連接池
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close(Statement stmt, Connection conn) {
        JDBCUtils.close(null, stmt, conn);
    }
}

6)JedisPoolUtils.java

package Demo03.utils;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class JedisPoolUtils {
    private static JedisPool jedisPool;

    static {
        InputStream is = JedisPoolUtils.class.getClassLoader().getResourceAsStream("jedis.properties");
        Properties pro = new Properties();
        try {
            pro.load(is);
        } catch (IOException e) {
            e.printStackTrace();
        }

        JedisPoolConfig config = new JedisPoolConfig();
        config.setMaxTotal(Integer.parseInt(pro.getProperty("maxTotal")));
        config.setMaxIdle(Integer.parseInt(pro.getProperty("maxIdle")));

        jedisPool = new JedisPool(config, pro.getProperty("host"), Integer.parseInt(pro.getProperty("port")));
    }

    public static Jedis getJedis() {
        return jedisPool.getResource();
    }
}

7)domain

User.java

package Demo03.domain;

public class User {
    public int uid;
    public String uname;
    public int gold;

    @Override
    public String toString() {
        return "User{" +
                "uid=" + uid +
                ", uname='" + uname + '\'' +
                ", gold=" + gold +
                '}';
    }
}

8)MysqlCenter.java

package Demo03.dao;

import Demo03.domain.User;
import Demo03.utils.JDBCUtils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class MysqlCenter {
    public static User getUserByUid(int paramUid) {
        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;

        try {
            conn = JDBCUtils.getConnection();
            String sql = "select * from t_user where uid = ?";
            pstmt = conn.prepareStatement(sql);
            pstmt.setInt(1, paramUid);
            rs = pstmt.executeQuery();

            User user = null;
            if (rs.next()) {
                int uid = rs.getInt("uid");
                String uname = rs.getString("uname");
                int gold = rs.getInt("gold");

                user = new User();
                user.uid = uid;
                user.uname = uname;
                user.gold = gold;
            }

            return user;
        } catch (Exception e) {
            return null;
        } finally {
            JDBCUtils.close(rs, pstmt, conn);
        }
    }
}

9)RedisCenter.java 

package Demo03.dao;

import Demo03.utils.JedisPoolUtils;
import redis.clients.jedis.Jedis;

import java.util.Set;

public class RedisCenter {
    public static void addToRank(String uname, int gold) {
        Jedis jedis = JedisPoolUtils.getJedis();
        jedis.zadd("rank", gold, uname);
        jedis.close();
    }

    public static Set<String> getRank() {
        Jedis jedis = JedisPoolUtils.getJedis();
        Set<String> rankSet = jedis.zrevrange("rank", 0, -1);
        jedis.close();

        return rankSet;
    }
}

10)Main.java 使用

package Demo03;

import Demo03.dao.MysqlCenter;
import Demo03.dao.RedisCenter;
import Demo03.domain.User;

import java.util.Set;

public class Main {
    public static void main(String[] args) {
        for (int i = 1; i <= 4; i++) {
            User user = MysqlCenter.getUserByUid(i);
            RedisCenter.addToRank(user.uname, user.gold);
        }

        long s = System.currentTimeMillis();
        Set<String> rankSet = null;

        for (int i = 0; i < 10000; i++) {
            rankSet = RedisCenter.getRank();
        }

        System.out.println(rankSet);
    }
}

運行結果

六月 13, 2020 2:46:32 下午 com.alibaba.druid.pool.DruidDataSource info
信息: {dataSource-1} inited
[賈靜, 賈楠, 孫晨軒, 孫晨曦]