redis小实验

首先需要搭建一个java环境
安装OpenJDK 1.8

解压到/usr/local/目录，并将安装目录重命名
tar -zxvf apache-maven-3.6.3-bin.tar.gz -C /usr/local/ &&
mv /usr/local/apache-maven-3.6.3/ /usr/local/maven

将Maven的可执行文件目录加入到系统环境变量中
echo "export PATH=$PATH:/usr/local/maven/bin" >> /etc/profile
source /etc/profile

打开镜像仓库配置文件
vim /usr/local/maven/conf/settings.xml
添加镜像地址

<mirror>
       <id>nexus-aliyun</id>
       <mirrorOf>central</mirrorOf>
       <name>Nexus aliyun</name>
       <url>http://maven.aliyun.com/nexus/content/groups/public</url>
</mirror>

创建并进入工作空间
mkdir -p demo/src/main/java/test/ && cd demo
vim打开GameRankSample.java文件
vim src/main/java/test/GameRankSample.java
输入:set paste

package test;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.UUID;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Tuple;
public class GameRankSample {
    static int TOTAL_SIZE = 20;
    public static void main(String[] args) 
    {
        //Redis数据库连接地址
        String host = "xxxxxxxxxx.m.cnhz1.kvstore.aliyuncs.com";
        //连接密码
        String password = "password";
        int port = 6379;
        Jedis jedis = new Jedis(host, port);
        try {
            String authString = jedis.auth(password);
            if (!authString.equals("OK"))
            {
                System.err.println("AUTH Failed: " + authString);
                return;
            }
            //Key(键)
            String key = "游戏名：奔跑吧，阿里！";
            //清除可能的已有数据
            jedis.del(key);
            //模拟生成若干个游戏玩家
            List<String> playerList = new ArrayList<String>();
            for (int i = 0; i < TOTAL_SIZE; ++i)
            {
                //随机生成每个玩家的ID
                playerList.add(UUID.randomUUID().toString());
            }
            System.out.println("输入所有玩家 ");
            //记录每个玩家的得分
            for (int i = 0; i < playerList.size(); i++)
            {
                //随机生成数字，模拟玩家的游戏得分
                int score = (int)(Math.random()*5000);
                String member = playerList.get(i);
                System.out.println("玩家ID：" + member + "， 玩家得分: " + score);
                //将玩家的ID和得分，都加到对应key的SortedSet中去
                jedis.zadd(key, score, member);
            }
            //输出打印全部玩家排行榜
            System.out.println();
            System.out.println("       "+key);
            System.out.println("       全部玩家排行榜                    ");
            //从对应key的SortedSet中获取已经排好序的玩家列表
            Set<Tuple> scoreList = jedis.zrevrangeWithScores(key, 0, -1);
            for (Tuple item : scoreList) {  
                System.out.println("玩家ID："+item.getElement()+"， 玩家得分:"+Double.valueOf(item.getScore()).intValue());
            }  
            //输出打印Top5玩家排行榜
            System.out.println();
            System.out.println("       "+key);
            System.out.println("       Top 玩家");
            scoreList = jedis.zrevrangeWithScores(key, 0, 4);
            for (Tuple item : scoreList) {  
                System.out.println("玩家ID："+item.getElement()+"， 玩家得分:"+Double.valueOf(item.getScore()).intValue());
            }
            //输出打印特定玩家列表
            System.out.println();
            System.out.println("         "+key);
            System.out.println("          积分在1000至2000的玩家");
            //从对应key的SortedSet中获取已经积分在1000至2000的玩家列表
            scoreList = jedis.zrangeByScoreWithScores(key, 1000, 2000);
            for (Tuple item : scoreList) {  
                System.out.println("玩家ID："+item.getElement()+"， 玩家得分:"+Double.valueOf(item.getScore()).intValue());
            } 
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            jedis.quit();
            jedis.close();
        }
    }
}

完成后输入:set nopaste 回车

vim打开pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>test</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.9.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <appendAssemblyId>false</appendAssemblyId>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                    <archive>
                        <manifest>
                            <!--jar入口类，格式Package.ClassName -->
                            <mainClass>test.GameRankSample</mainClass>
                        </manifest>
                    </archive>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>assembly</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>