Redis Jedis

最新推荐文章于 2023-02-26 14:30:30 发布

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最新推荐文章于 2023-02-26 14:30:30 发布

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分类专栏： Redis 文章标签： redis java

本文链接：https://blog.youkuaiyun.com/weixin_45729272/article/details/124552795

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什么是Jedis

是 Redis 官方推荐的 java连接开发工具！使用Java 操作Redis 中间件！

导入依赖

<!--导入jedis的包-->
<dependencies>
    <!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
    <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
        <version>3.2.0</version>
    </dependency>
    <!--fastjson-->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.62</version>
    </dependency>
</dependencies>

2、编码测试：

连接数据库
操作命令
断开连接！

import redis.clients.jedis.Jedis;
public class TestPing {
    public static void main(String[] args) {
        // 1、 new Jedis 对象即可
        Jedis jedis = new Jedis("127.0.0.1",6379);
        // jedis 所有的命令就是我们之前学习的所有指令！所以之前的指令学习很重要！
        System.out.println(jedis.ping());
    }
}

输出：

连接Redis时要修改配置文件

daemonize 设置yes (后台运行)
protected-mode no 关闭保护模式（即开启远程访问）
把 bine 127.0.0.1 注释掉，去掉请求访问ip限制
关闭防火墙等

常用API

public class JedisType {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);

        System.out.println("=================== String =========================");
        System.out.println(jedis.set("name", "zs"));
        System.out.println(jedis.get("name"));
        System.out.println(jedis.append("name", "+value"));
        System.out.println(jedis.get("name"));
        System.out.println(jedis.strlen("name"));

        System.out.println("=================== List =========================");
        System.out.println(jedis.lpush("listKey", "l1", "l2", "l3"));
        System.out.println(jedis.lrange("listKey", 0, -1)); // [l3, l2, l1]
        System.out.println(jedis.llen("listKey"));

        System.out.println("=================== Hash =========================");
        System.out.println(jedis.hset("hashKey", "k1", "v1"));
        System.out.println(jedis.hset("hashKey", "k2", "v2"));
        System.out.println(jedis.hset("hashKey", "k3", "v3"));
        System.out.println(jedis.hmget("hashKey", "k1", "k2", "k3")); // [v1, v2, v3]
        System.out.println(jedis.hgetAll("hashKey")); // {k3=v3, k2=v2, k1=v1}

        System.out.println("=================== Set =========================");
        System.out.println(jedis.sadd("setKey", "s1", "s2", "s3", "s4"));
        System.out.println(jedis.smembers("setKey")); // [s2, s1, s4, s3]
        System.out.println(jedis.scard("setKey"));

        System.out.println("=================== Zset =========================");
        System.out.println(jedis.zadd("ZKey", 90, "z1"));
        System.out.println(jedis.zadd("ZKey", 80, "z2"));
        System.out.println(jedis.zadd("ZKey", 85, "z3"));
        System.out.println(jedis.zrange("ZKey", 0, -1)); // [z2, z3, z1]
    }
}

1、通用API

public class TestKey {
    public TestKey() {
    }

    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        System.out.println("清空数据：" + jedis.flushDB());
        System.out.println("判断某个键是否存在：" + jedis.exists("username"));
        System.out.println("新增<'username','kuangshen'>的键值对：" + jedis.set("username", "kuangshen"));
        System.out.println("新增<'password','password'>的键值对：" + jedis.set("password", "password"));
        System.out.print("系统中所有的键如下：");
        Set<String> keys = jedis.keys("*");
        System.out.println(keys);
        System.out.println("删除键password:" + jedis.del("password"));
        System.out.println("判断键password是否存在：" + jedis.exists("password"));
        System.out.println("查看键username所存储的值的类型：" + jedis.type("username"));
        System.out.println("随机返回key空间的一个：" + jedis.randomKey());
        System.out.println("重命名key：" + jedis.rename("username", "name"));
        System.out.println("取出改后的name：" + jedis.get("name"));
        System.out.println("按索引查询：" + jedis.select(0));
        System.out.println("删除当前选择数据库中的所有key：" + jedis.flushDB());
        System.out.println("返回当前数据库中key的数目：" + jedis.dbSize());
        System.out.println("删除所有数据库中的所有key：" + jedis.flushAll());
        
        jedis.connect();
        jedis.disconnect();
        jedis.flushAll();
    }
}

2、String（字符串）

public class TestString {
    public TestString() {
    }

    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        System.out.println("===========增加数据===========");
        System.out.println(jedis.set("key1", "value1"));
        System.out.println(jedis.set("key2", "value2"));
        System.out.println(jedis.set("key3", "value3"));
        
        System.out.println("删除键key2:" + jedis.del("key2"));
        System.out.println("获取键key2:" + jedis.get("key2"));
        System.out.println("修改key1:" + jedis.set("key1", "value1Changed"));
        System.out.println("获取key1的值：" + jedis.get("key1"));
        System.out.println("在key3后面加入值：" + jedis.append("key3", "End"));
        System.out.println("key3的值：" + jedis.get("key3"));
        System.out.println("增加多个键值对：" + jedis.mset(new String[]{"key01", "value01", "key02", "value02", "key03", "value03"}));
        System.out.println("获取多个键值对：" + jedis.mget(new String[]{"key01", "key02", "key03"}));
        System.out.println("获取多个键值对：" + jedis.mget(new String[]{"key01", "key02", "key03", "key04"}));
        System.out.println("删除多个键值对：" + jedis.del(new String[]{"key01", "key02"}));
        System.out.println("获取多个键值对：" + jedis.mget(new String[]{"key01", "key02", "key03"}));
        jedis.flushDB();
        System.out.println("===========新增键值对防止覆盖原先值==============");
        System.out.println(jedis.setnx("key1", "value1"));
        System.out.println(jedis.setnx("key2", "value2"));
        System.out.println(jedis.setnx("key2", "value2-new"));
        System.out.println(jedis.get("key1"));
        System.out.println(jedis.get("key2"));
        System.out.println("===========新增键值对并设置有效时间=============");
        System.out.println(jedis.setex("key3", 2, "value3"));
        System.out.println(jedis.get("key3"));

        try {
            TimeUnit.SECONDS.sleep(3L);
        } catch (InterruptedException var3) {
            var3.printStackTrace();
        }

        System.out.println(jedis.get("key3"));
        System.out.println("===========获取原值，更新为新值==========");
        System.out.println(jedis.getSet("key2", "key2GetSet"));
        System.out.println(jedis.get("key2"));
        System.out.println("获得key2的值的字串：" + jedis.getrange("key2", 2L, 4L));
    }
}

3、List（列表）

public class TestList {
    public TestList() {
    }

    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        System.out.println("===========添加一个list===========");
        jedis.lpush("collections", new String[]{"ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap"});
        jedis.lpush("collections", new String[]{"HashSet"});
        jedis.lpush("collections", new String[]{"TreeSet"});
        jedis.lpush("collections", new String[]{"TreeMap"});
        System.out.println("collections的内容：" + jedis.lrange("collections", 0L, -1L));
        System.out.println("collections区间0-3的元素：" + jedis.lrange("collections", 0L, 3L));
        System.out.println("===============================");
        System.out.println("删除指定元素个数：" + jedis.lrem("collections", 2L, "HashMap"));
        System.out.println("collections的内容：" + jedis.lrange("collections", 0L, -1L));
        System.out.println("删除下表0-3区间之外的元素：" + jedis.ltrim("collections", 0L, 3L));
        System.out.println("collections的内容：" + jedis.lrange("collections", 0L, -1L));
        System.out.println("collections列表出栈（左端）：" + jedis.lpop("collections"));
        System.out.println("collections的内容：" + jedis.lrange("collections", 0L, -1L));
        System.out.println("collections添加元素，从列表右端，与lpush相对应：" + jedis.rpush("collections", new String[]{"EnumMap"}));
        System.out.println("collections的内容：" + jedis.lrange("collections", 0L, -1L));
        System.out.println("collections列表出栈（右端）：" + jedis.rpop("collections"));
        System.out.println("collections的内容：" + jedis.lrange("collections", 0L, -1L));
        System.out.println("修改collections指定下标1的内容：" + jedis.lset("collections", 1L, "LinkedArrayList"));
        System.out.println("collections的内容：" + jedis.lrange("collections", 0L, -1L));
        System.out.println("===============================");
        System.out.println("collections的长度：" + jedis.llen("collections"));
        System.out.println("获取collections下标为2的元素：" + jedis.lindex("collections", 2L));
        System.out.println("===============================");
        jedis.lpush("sortedList", new String[]{"3", "6", "2", "0", "7", "4"});
        System.out.println("sortedList排序前：" + jedis.lrange("sortedList", 0L, -1L));
        System.out.println(jedis.sort("sortedList"));
        System.out.println("sortedList排序后：" + jedis.lrange("sortedList", 0L, -1L));
    }
}

4、set（集合）

public class TestSet {
    public TestSet() {
    }

    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        System.out.println("============向集合中添加元素（不重复）============");
        System.out.println(jedis.sadd("eleSet", new String[]{"e1", "e2", "e4", "e3", "e0", "e8", "e7", "e5"}));
        System.out.println(jedis.sadd("eleSet", new String[]{"e6"}));
        System.out.println(jedis.sadd("eleSet", new String[]{"e6"}));
        System.out.println("eleSet的所有元素为：" + jedis.smembers("eleSet"));
        System.out.println("删除一个元素e0：" + jedis.srem("eleSet", new String[]{"e0"}));
        System.out.println("eleSet的所有元素为：" + jedis.smembers("eleSet"));
        System.out.println("删除两个元素e7和e6：" + jedis.srem("eleSet", new String[]{"e7", "e6"}));
        System.out.println("eleSet的所有元素为：" + jedis.smembers("eleSet"));
        System.out.println("随机的移除集合中的一个元素：" + jedis.spop("eleSet"));
        System.out.println("随机的移除集合中的一个元素：" + jedis.spop("eleSet"));
        System.out.println("eleSet的所有元素为：" + jedis.smembers("eleSet"));
        System.out.println("eleSet中包含元素的个数：" + jedis.scard("eleSet"));
        System.out.println("e3是否在eleSet中：" + jedis.sismember("eleSet", "e3"));
        System.out.println("e1是否在eleSet中：" + jedis.sismember("eleSet", "e1"));
        System.out.println("e1是否在eleSet中：" + jedis.sismember("eleSet", "e5"));
        System.out.println("=================================");
        System.out.println(jedis.sadd("eleSet1", new String[]{"e1", "e2", "e4", "e3", "e0", "e8", "e7", "e5"}));
        System.out.println(jedis.sadd("eleSet2", new String[]{"e1", "e2", "e4", "e3", "e0", "e8"}));
        System.out.println("将eleSet1中删除e1并存入eleSet3中：" + jedis.smove("eleSet1", "eleSet3", "e1"));
        System.out.println("将eleSet1中删除e2并存入eleSet3中：" + jedis.smove("eleSet1", "eleSet3", "e2"));
        System.out.println("eleSet1中的元素：" + jedis.smembers("eleSet1"));
        System.out.println("eleSet3中的元素：" + jedis.smembers("eleSet3"));
        System.out.println("============集合运算=================");
        System.out.println("eleSet1中的元素：" + jedis.smembers("eleSet1"));
        System.out.println("eleSet2中的元素：" + jedis.smembers("eleSet2"));
        System.out.println("eleSet1和eleSet2的交集:" + jedis.sinter(new String[]{"eleSet1", "eleSet2"}));
        System.out.println("eleSet1和eleSet2的并集:" + jedis.sunion(new String[]{"eleSet1", "eleSet2"}));
        System.out.println("eleSet1和eleSet2的差集:" + jedis.sdiff(new String[]{"eleSet1", "eleSet2"}));
        jedis.sinterstore("eleSet4", new String[]{"eleSet1", "eleSet2"});
        System.out.println("eleSet4中的元素：" + jedis.smembers("eleSet4"));
    }
}

5、Hash（哈希）

public class TestHash {
    public TestHash() {
    }

    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        Map<String, String> map = new HashMap();
        map.put("key1", "value1");
        map.put("key2", "value2");
        map.put("key3", "value3");
        map.put("key4", "value4");
        jedis.hmset("hash", map);
        jedis.hset("hash", "key5", "value5");
        System.out.println("散列hash的所有键值对为：" + jedis.hgetAll("hash"));
        System.out.println("散列hash的所有键为：" + jedis.hkeys("hash"));
        System.out.println("散列hash的所有值为：" + jedis.hvals("hash"));
        System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6：" + jedis.hincrBy("hash", "key6", 6L));
        System.out.println("散列hash的所有键值对为：" + jedis.hgetAll("hash"));
        System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6：" + jedis.hincrBy("hash", "key6", 3L));
        System.out.println("散列hash的所有键值对为：" + jedis.hgetAll("hash"));
        System.out.println("删除一个或者多个键值对：" + jedis.hdel("hash", new String[]{"key2"}));
        System.out.println("散列hash的所有键值对为：" + jedis.hgetAll("hash"));
        System.out.println("散列hash中键值对的个数：" + jedis.hlen("hash"));
        System.out.println("判断hash中是否存在key2：" + jedis.hexists("hash", "key2"));
        System.out.println("判断hash中是否存在key3：" + jedis.hexists("hash", "key3"));
        System.out.println("获取hash中的值：" + jedis.hmget("hash", new String[]{"key3"}));
        System.out.println("获取hash中的值：" + jedis.hmget("hash", new String[]{"key3", "key4"}));
    }
}

测试事务

public class TestTX {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("name", "张三");
        jsonObject.put("age", "21");
        jsonObject.put("sex", "boy");

         //  开启事务
        Transaction multi = jedis.multi();
        String user = jsonObject.toJSONString();
        try {
            multi.set("user1", user);
            multi.set("user2", user);
            //执行事务
            multi.exec();
        } catch (Exception e) {
            multi.discard(); // 出现问题，放弃事务
            e.printStackTrace();
        } finally {
            System.out.println(jedis.mget("user1", "user2"));
            jedis.close(); // 关闭连接
        }
    }
}

输出

[{"sex":"boy","name":"张三","age":"21"}, {"sex":"boy","name":"张三","age":"21"}]