Redis登录，缓存，实现购物车功能

数据库 2018-06-19 05:14:19 阅读次数: 3

1.登录和缓存功能实现

package com.redis;

import redis.clients.jedis.Jedis;

/**
 * FileName: 登录和缓存
 * Author:   sujinran
 * Date:     2018/6/17 15:12
 */
public class LoginAndCookie {
    /**
     * 检查用户是否登录
     * @param conn redis连接
     * @param token 令牌
     * @return
     */
    public String checkToken(Jedis conn, String token) {
        //hget散列
        return conn.hget("login:", token);
    }

    /**
     * 更新令牌
     * @param conn redis连接
     * @param token 令牌
     * @param user 用户
     * @param item 商品
     */
    public void updateToken(Jedis conn, String token, String user, String item) {
        //获取当前时间戳
        long timestamp = System.currentTimeMillis() / 1000;
        //令牌和已经登录的用户映射
        conn.hset("login:", token, user);
        //记录令牌最后一次出现的时间
        conn.zadd("recent:", timestamp, token);
        if (item != null) {//传入的商品不是空的
            //记录浏览过的商品
            conn.zadd("viewed:" + token, timestamp, item);
            //移除旧的记录，保留最近浏览过的25个商品
            conn.zremrangeByRank("viewed:" + token, 0, -26);
            //Zincrby 命令对有序集合中指定成员的分数加上增量
            conn.zincrby("viewed:", -1, item);
        }
    }


}

更新会话：

package com.util;

import redis.clients.jedis.Jedis;

import java.util.ArrayList;
import java.util.Set;

/**
 * FileName: 更新登录会话
 * Author:   sujinran
 * Date:     2018/6/17 19:40
 */
public class CleanSessionsThread extends Thread {
    private Jedis conn;
    private int limit;
    private boolean quit;

    public CleanSessionsThread(int limit) {
        this.conn = new Jedis("localhost");
        this.conn.auth("123456");
        this.conn.select(15);
        this.limit = limit;
    }

    public void quit() {
        quit = true;
    }

    public void run() {
        while (!quit) {
            //依据登录时间确定在线人数
            long size = conn.zcard("recent:");
            if (size <= limit) {
                try {
                    sleep(1000);
                } catch (InterruptedException ie) {
                    Thread.currentThread().interrupt();
                }
                continue;
            }

            long endIndex = Math.min(size - limit, 100);
            Set<String> tokenSet = conn.zrange("recent:", 0, endIndex - 1);
            String[] tokens = tokenSet.toArray(new String[tokenSet.size()]);

            ArrayList<String> sessionKeys = new ArrayList<String>();
            for (String token : tokens) {
                sessionKeys.add("viewed:" + token);
            }
            conn.del(sessionKeys.toArray(new String[sessionKeys.size()]));
            conn.hdel("login:", tokens);
            conn.zrem("recent:", tokens);
        }
    }
}

登录和缓存功能测试：

import com.util.CleanSessionsThread;
import com.redis.LoginAndCookie;
import org.junit.Test;
import redis.clients.jedis.Jedis;
import java.util.UUID;

/**
 * FileName: 登录和缓存测试
 * Author:   sujinran
 * Date:     2018/6/17 19:15
 */
public class LoginAndCookieTest {
    public static void main(String[] args) throws InterruptedException {
        Jedis conn =new Jedis("127.0.0.1");
        conn.auth("123456");
        LoginAndCookieTest loginAndCookieTest =new LoginAndCookieTest();
        loginAndCookieTest.testLoginCookies(conn);
    }
    /**
     * 登录测试
     *
     * @throws InterruptedException
     */
    public void testLoginCookies(Jedis conn) throws InterruptedException {
        /*
        这里令牌自动生成
        UUID.randomUUID().toString():javaJDK提供的一个自动生成主键的方法
         */
        String token = UUID.randomUUID().toString();
        //创建登录和缓存类的对象
        LoginAndCookie loginAndCookie = new LoginAndCookie();
        /*
        使用 LoginAndCookie 中的updateToken()的方法更新令牌
        conn:Redis连接，user1:用户，item1:商品
         */
        loginAndCookie.updateToken(conn, token, "user1", "item1");
        System.out.println("我们刚刚登录/更新了令牌:" + token);
        System.out.println("用户使用: 'user1'");
        System.out.println();

        System.out.println("当我们查找令牌时会得到什么用户名");
        String r = loginAndCookie.checkToken(conn, token);
        //r是令牌
        System.out.println(r);
        System.out.println();
        assert r != null;

        System.out.println("让我们把cookies的最大数量降到0来清理它们");
        System.out.println("我们开始用线程来清理，一会儿再停止");

        CleanSessionsThread thread = new CleanSessionsThread(0);
        thread.start();
        Thread.sleep(1000);
        thread.quit();
        Thread.sleep(2000);
        if (thread.isAlive()) {
            throw new RuntimeException("线程还存活?!?");
        }
        //Hlen命令用于获取哈希表中字段的数量
        long s = conn.hlen("login:");
        System.out.println("目前仍可提供的sessions次数如下: " + s);
        assert s == 0;
    }

}

2.购物车功能实现

package com.redis;

import redis.clients.jedis.Jedis;

/**
 * FileName: 购物车实现
 * Author:   sujinran
 * Date:     2018/6/17 20:27
 */
public class AddToCart {
    /**
     *  购物车实现
     * @param conn 连接
     * @param session 会话
     * @param item 商品
     * @param count 总数
     */
    public void addToCart(Jedis conn, String session, String item, int count) {
        //总数<=0
        if (count <= 0) {
            // 购物车移除指定的商品，HDEL 每次只能删除单个域
            conn.hdel("cart:" + session, item);
        } else {
            //将指定的商品添加到购物车,Hset 命令用于为哈希表中的字段赋值
            conn.hset("cart:" + session, item, String.valueOf(count));
        }
    }
}

更新会话：

package com.util;

import redis.clients.jedis.Jedis;

import java.util.ArrayList;
import java.util.Set;

/**
 * FileName: 更新购物车会话
 * Author:   sujinran
 * Date:     2018/6/17 20:35
 */
public class CleanFullSessionsThread extends Thread {
    private Jedis conn;
    private int limit;
    private boolean quit;

    public CleanFullSessionsThread(int limit) {
        this.conn = new Jedis("localhost");
        this.conn.auth("123456");
        this.conn.select(15);
        this.limit = limit;
    }

    public void quit() {
        quit = true;
    }

    public void run() {
        while (!quit) {
            long size = conn.zcard("recent:");
            if (size <= limit) {
                try {
                    sleep(1000);
                } catch (InterruptedException ie) {
                    Thread.currentThread().interrupt();
                }
                continue;
            }

            long endIndex = Math.min(size - limit, 100);
            Set<String> sessionSet = conn.zrange("recent:", 0, endIndex - 1);
            String[] sessions = sessionSet.toArray(new String[sessionSet.size()]);

            ArrayList<String> sessionKeys = new ArrayList<String>();
            for (String sess : sessions) {
                sessionKeys.add("viewed:" + sess);
                sessionKeys.add("cart:" + sess);
            }

            conn.del(sessionKeys.toArray(new String[sessionKeys.size()]));
            conn.hdel("login:", sessions);
            conn.zrem("recent:", sessions);
        }
    }
}

购物车功能测试：

import com.redis.AddToCart;
import com.redis.LoginAndCookie;
import com.util.CleanFullSessionsThread;
import redis.clients.jedis.Jedis;

import java.util.Map;
import java.util.UUID;

/**
 * FileName: 添加商品到购物车测试
 * Author:   sujinran
 * Date:     2018/6/17 20:39
 */
public class AddToCartTest {
    AddToCart addToCart =new AddToCart();
    LoginAndCookie loginAndCookie =new LoginAndCookie();


    public static void main(String[] args) throws InterruptedException {
        Jedis conn = new Jedis("127.0.0.1");
        conn.auth("123456");
        AddToCartTest addToCartTest =new AddToCartTest();
        addToCartTest.testShopppingCartCookies(conn);
    }
    /**
     * 添加商品到购物车测试
     * @param conn
     * @throws InterruptedException
     */
    public void testShopppingCartCookies(Jedis conn) throws InterruptedException {
         /*
        这里令牌自动生成
        UUID.randomUUID().toString():javaJDK提供的一个自动生成主键的方法
         */
        String token = UUID.randomUUID().toString();

        System.out.println("我们将刷新我们的会话.");
        loginAndCookie.updateToken(conn, token, "user2", "item2");
        System.out.println("并在购物车中添加一个商品");
        addToCart.addToCart(conn, token, "item2", 3);
        Map<String, String> r = conn.hgetAll("cart:" + token);
        System.out.println("我们的购物车目前有:");
        for (Map.Entry<String, String> entry : r.entrySet()) {
            System.out.println("  " + entry.getKey() + ": " + entry.getValue());
        }
        System.out.println();

        assert r.size() >= 1;

        System.out.println("让我们清理我们的会话和购物车");
        CleanFullSessionsThread thread = new CleanFullSessionsThread(0);
        thread.start();
        Thread.sleep(1000);
        thread.quit();
        Thread.sleep(2000);
        if (thread.isAlive()) {
            throw new RuntimeException("清理会话线程还存在");
        }
        r = conn.hgetAll("cart:" + token);
        System.out.println("我们的购物车现在装有:");
        for (Map.Entry<String, String> entry : r.entrySet()) {
            System.out.println("  " + entry.getKey() + ": " + entry.getValue());
        }
        assert r.size() == 0;
    }

}

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