6.Jedis相关API和事务操作

感谢秦疆老师的redis视频教程，更多了解哔哩哔哩搜索【狂神说Java】。

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Jedis

我们要使用Java来操作Redis!

什么是Jedis ？是Redis官方推荐的java连接开发工具！使用Java操作Redis操作reids,那么一定要对Jedis十分的熟悉！

测试

导入pom.xml依赖

<dependencies>
    <!--导入jedis包-->
    <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>

编码测试：
- 连接数据库
- 操作命令
- 断开连接

在这里插入图片描述

package com.beiluo;
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所有的命令就是之前在redis-cli 操作的所有命令      
        //看本地redis是否ping通
        System.out.println(jedis.ping());
        
    }
}

输出：

在这里插入图片描述

常用的API

String
List
Set
Hash
Zset

1.测试key

package com.beiluo;

import redis.clients.jedis.Jedis;

import java.util.Set;

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

        //测试key-value的用法
        System.out.println("1.清空数据："+jedis.flushDB());
        System.out.println("2.判断某个键是否存在："+jedis.exists("username"));
        System.out.println("3.新增<'username','lq'>的键值对："+jedis.set("username","lq"));
        System.out.println("4.新增<'password','123456'>的键值对："+jedis.set("password","123456"));
        System.out.println("5.系统中所有的键如下：");
        Set<String > keys = jedis.keys("*");
        System.out.println(keys);
        System.out.println("6.删除键password:"+jedis.del("password"));
        System.out.println("7.判断键password是否存在："+jedis.exists("password"));
        System.out.println("8.查看键username缩存储的值的类型："+jedis.type("username"));
        System.out.println("9.随机返回key空间的某一个："+jedis.randomKey());
        System.out.println("10.重命名key:"+jedis.rename("username","myname"));
        System.out.println("11.取出改后的myname:"+jedis.get("myname"));
        System.out.println("12.按索引查询："+jedis.select(0));
        System.out.println("13.删除当前选择数据库的所有key:"+jedis.flushDB());
        System.out.println("14.返回当前数据库中key的数目："+jedis.dbSize());
        System.out.println("15.删除所有数据库中的所有key:"+jedis.flushAll());

    }
}

输出：

在这里插入图片描述

2.测试String

public class 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("1.删除键key2:" + jedis.del("key2"));
        System.out.println("2.获取键key2：" + jedis.get("key2"));
        System.out.println("3.修改key1:" + jedis.set("key1", "valueChanged"));
        System.out.println("4.获取key1的值：" + jedis.get("key1"));
        System.out.println("5.在key3后面追加值：" + jedis.append("key3", "End"));
        System.out.println("6.获取key3的值：" + jedis.get("key3"));
        System.out.println("7.增加多个键值对：" + jedis.mset("key4", "value4", "key5", "value5"));
        System.out.println("8.获取多个键值对：" + jedis.mget("key1", "key4"));
        System.out.println("9.获取多个键值对：" + jedis.mget(""));
        System.out.println("10.删除多个键值对：" + jedis.del("key1", "key4"));
        System.out.println("11.获取多个键值对：" + jedis.mget("key1", "key2"));

        jedis.flushDB();
        System.out.println("================新增键值对防止被覆盖================");
        System.out.println(jedis.setnx("key1", "value1"));
        System.out.println(jedis.setnx("key2", "value2"));
        System.out.println(jedis.setnx("key2", "value2-newValue"));
        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(3);
        } catch (InterruptedException e) {
            e.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("截取指定下标key2的字符串：" + jedis.getrange("key2", 2, 4));

    }
}

输出：

Connected to the target VM, address: '127.0.0.1:59337', transport: 'socket'
===================增加数据====================
OK
OK
OK
1.删除键key2:1
2.获取键key2：null
3.修改key1:OK
4.获取key1的值：valueChanged
5.在key3后面追加值：9
6.获取key3的值：value3End
7.增加多个键值对：OK
8.获取多个键值对：[valueChanged, value4]
9.获取多个键值对：[null]
10.删除多个键值对：2
11.获取多个键值对：[null, null]
================新增键值对防止被覆盖================
1
1
0
value1
value2
================新增键值对并设置有效时间================
OK
value3
null
================获取原值，更新为新值================
value2
key2GetSet
截取指定下标key2的字符串：y2G

3.测试List

public class 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","ArrayList","Vector","Stack","HashMap");
        jedis.lpush("collections","HashSet");
        jedis.lpush("collections","TreeSet");//从左边往进加
        jedis.rpush("collections","HashMap");//从右边往进加
        jedis.lpush("collections","TreeMap");
        System.out.println("collections中的内容："+jedis.lrange("collections",0,-1));//-1代表倒数第一个
        System.out.println("collections中0到3区间的内容："+jedis.lrange("collections",0,3));
        System.out.println("============================");
        //删除列表指定的值，第二个参数为删除的个数（有重复时）！后add进去的值先被删掉，类似于出栈！
        System.out.println("删除指定个数的元素："+jedis.lrem("collections",2,"HashMap"));
        System.out.println("collections中的内容："+jedis.lrange("collections",0,-1));
        System.out.println("删除下标0-3区间之外的元素："+jedis.ltrim("collections",0,3));
        System.out.println("collections中的内容："+jedis.lrange("collections",0,-1));
        System.out.println("collections列表出栈（左）："+jedis.lpop("collections"));
        System.out.println("collections中的内容："+jedis.lrange("collections",0,-1));
        System.out.println("collections列表出栈（右）："+jedis.rpop("collections"));
        System.out.println("collections中的内容："+jedis.lrange("collections",0,-1));
        System.out.println("修改指定下标1的内容："+jedis.lset("collections",1,"hahaaha"));
        System.out.println("collections中的内容："+jedis.lrange("collections",0,-1));
        System.out.println("============================");
        System.out.println("collections的长度："+jedis.llen("collections"));
        System.out.println("获取指定下标1的元素："+jedis.lindex("collections",1));
        System.out.println("==============排序==============");
        jedis.lpush("sortedList","5","6","4","3","9","1");
        System.out.println("排序前："+jedis.lrange("sortedList",0,-1));
        System.out.println("排序后："+jedis.sort("sortedList"));
    }
}

输出：

Connected to the target VM, address: '127.0.0.1:59438', transport: 'socket'
=========添加一个List========
collections中的内容：[TreeMap, TreeSet, HashSet, HashMap, Stack, Vector, ArrayList, HashMap]
collections中0到3区间的内容：[TreeMap, TreeSet, HashSet, HashMap]
============================
删除指定个数的元素：2
collections中的内容：[TreeMap, TreeSet, HashSet, Stack, Vector, ArrayList]
删除下标0-3区间之外的元素：OK
collections中的内容：[TreeMap, TreeSet, HashSet, Stack]
collections列表出栈（左）：TreeMap
collections中的内容：[TreeSet, HashSet, Stack]
collections列表出栈（右）：Stack
collections中的内容：[TreeSet, HashSet]
修改指定下标1的内容：OK
collections中的内容：[TreeSet, hahaaha]
============================
collections的长度：2
获取指定下标1的元素：hahaaha
==============排序==============
排序前：[1, 9, 3, 4, 6, 5]
排序后：[1, 3, 4, 5, 6, 9]

4.测试Set

public class 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("set","e1","e3","e2","e5","e7","e4","e0","e8"));
        System.out.println(jedis.sadd("set","e6"));
        System.out.println(jedis.sadd("set","e6"));
        System.out.println("set集合中所有的元素为："+jedis.smembers("set"));
        System.out.println("删除一个指定元素e0："+jedis.srem("set","e0"));
        System.out.println("set集合中所有的元素为："+jedis.smembers("set"));
        System.out.println("删除多个指定元素e7，e5："+jedis.srem("set","e7","e5"));
        System.out.println("set集合中所有的元素为："+jedis.smembers("set"));
        System.out.println("随机的移除集合中的一个元素："+jedis.spop("set"));
        System.out.println("随机的移除集合中的一个元素："+jedis.spop("set"));
        System.out.println("set集合中所有的元素为："+jedis.smembers("set"));
        System.out.println("set集合中的元素个数："+jedis.scard("set"));
        System.out.println("e1是否在set集合中："+jedis.sismember("set","e1"));
        System.out.println("========================================================");
        System.out.println(jedis.sadd("set1","e1","e3","e2","e5","e7","e4","e6"));
        System.out.println(jedis.sadd("set2","e1","e3","e0","e5","e8","e4","e6"));
        System.out.println("将set1中的元素删掉e1并将e1存入set3中："+jedis.smove("set1","set3","e1"));
        System.out.println("将set1中的元素删掉e5并将e5存入set3中："+jedis.smove("set1","set3","e5"));
        System.out.println("set1集合中所有的元素为："+jedis.smembers("set1"));
        System.out.println("set3集合中所有的元素为："+jedis.smembers("set3"));
        System.out.println("=====================集合运算=======================");
        System.out.println("set1集合中所有的元素为："+jedis.smembers("set1"));
        System.out.println("set2集合中所有的元素为："+jedis.smembers("set2"));
        System.out.println("set1与set2集合的并集："+jedis.sunion("set1","set2"));
        System.out.println("set1与set2集合的交集："+jedis.sinter("set1","set2"));
        System.out.println("set1与set2集合的差集："+jedis.sdiff("set1","set2"));//set1与set2中去掉交集后剩余的元素
        jedis.sinterstore("set4","set1","set2");//求交集并将交集保存在dstkey中
        System.out.println("set4集合中所有的元素为："+jedis.smembers("set4"));
    }
}

输出：

Connected to the target VM, address: '127.0.0.1:59524', transport: 'socket'
===============向集合中添加元素（不重复）================
8
1
0
set集合中所有的元素为：[e0, e7, e1, e3, e2, e5, e4, e6, e8]
删除一个指定元素e0：1
set集合中所有的元素为：[e7, e1, e3, e2, e5, e4, e6, e8]
删除多个指定元素e7，e5：2
set集合中所有的元素为：[e4, e6, e2, e3, e1, e8]
随机的移除集合中的一个元素：e1
随机的移除集合中的一个元素：e4
set集合中所有的元素为：[e6, e2, e3, e8]
set集合中的元素个数：4
e1是否在set集合中：false
========================================================
7
7
将set1中的元素删掉e1并将e1存入set3中：1
将set1中的元素删掉e5并将e5存入set3中：1
set1集合中所有的元素为：[e6, e7, e3, e2, e4]
set3集合中所有的元素为：[e1, e5]
=====================集合运算=======================
set1集合中所有的元素为：[e6, e7, e3, e2, e4]
set2集合中所有的元素为：[e8, e6, e0, e1, e3, e5, e4]
set1与set2集合的并集：[e0, e7, e1, e3, e2, e4, e6, e8, e5]
set1与set2集合的交集：[e6, e3, e4]
set1与set2集合的差集：[e7, e2]
set4集合中所有的元素为：[e3, e6, e4]

5.测试Hash

public class TestHash {

    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        HashMap<String, String> map = new HashMap<String, String>();
        map.put("k1","v1");
        map.put("k2","v2");
        map.put("k3","v3");
        map.put("k4","v4");

        //添加元素
        jedis.hmset("hash",map);
        //还可以这么添加
        jedis.hset("hash","k5","v5");
        System.out.println("散列hash的所有键值对："+jedis.hgetAll("hash"));
        System.out.println("散列hash的所有键："+jedis.hkeys("hash"));
        System.out.println("散列hash的所有值："+jedis.hvals("hash"));
        System.out.println("将k6的保存的值加上一个整数，如果k6不存在则添加k6："+jedis.hincrBy("hash","k6",5));
        System.out.println("散列hash的所有键值对："+jedis.hgetAll("hash"));
        System.out.println("将k6的保存的值加上一个整数，如果k6不存在则添加k6："+jedis.hincrBy("hash","k6",5));
        System.out.println("散列hash的所有键值对："+jedis.hgetAll("hash"));
        System.out.println("删除一个或者多个键值对："+jedis.hdel("hash","k1","k3"));
        System.out.println("散列hash的所有键值对："+jedis.hgetAll("hash"));
        System.out.println("散列hash的所有键值对个数："+jedis.hlen("hash"));
        System.out.println("判断k2是否在hash中："+jedis.hexists("hash","k2"));
        System.out.println("判断k1是否在hash中："+jedis.hexists("hash","k1"));
        System.out.println("获取hash中的一个值："+jedis.hmget("hash","k4"));
        System.out.println("获取hash中的多个值："+jedis.hmget("hash","k4","k6"));

    }
}

输出：

Connected to the target VM, address: '127.0.0.1:59560', transport: 'socket'
散列hash的所有键值对：{k3=v3, k4=v4, k5=v5, k1=v1, k2=v2}
散列hash的所有键：[k3, k4, k5, k1, k2]
散列hash的所有值：[v4, v3, v1, v2, v5]
将k6的保存的值加上一个整数，如果k6不存在则添加k6：5
散列hash的所有键值对：{k3=v3, k4=v4, k5=v5, k6=5, k1=v1, k2=v2}
将k6的保存的值加上一个整数，如果k6不存在则添加k6：10
散列hash的所有键值对：{k3=v3, k4=v4, k5=v5, k6=10, k1=v1, k2=v2}
删除一个或者多个键值对：2
散列hash的所有键值对：{k4=v4, k5=v5, k2=v2, k6=10}
散列hash的所有键值对个数：4
判断k2是否在hash中：true
判断k1是否在hash中：false
获取hash中的一个值：[v4]
获取hash中的多个值：[v4, 10]

6.测试Zset

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

        jedis.flushDB();
        jedis.zadd("myset",1,"one");
        jedis.zadd("myset",2,"two");
        jedis.zadd("myset",3,"three");
        System.out.println("查看全部的值："+jedis.zrange("myset",0,-1));

        jedis.flushDB();
        jedis.zadd("salsry",2500,"zhangsan");
        jedis.zadd("salsry",500,"lisi");
        jedis.zadd("salsry",5000,"wangwu");
        System.out.println("由高到低排序："+jedis.zrangeByScore("salsry","-inf","+inf"));
        System.out.println("由高到低排序："+jedis.zrevrangeByScore("salsry","+inf","-inf"));
        System.out.println("查看全部的值："+jedis.zrange("salsry",0,-1));
        jedis.zrem("salsry","lisi");
        System.out.println("查看全部的值："+jedis.zrange("salsry",0,-1));
        System.out.println("查看所有元素的个数："+jedis.zcard("salsry"));

        jedis.flushDB();
        jedis.zadd("myset",1,"one");
        jedis.zadd("myset",2,"two");
        jedis.zadd("myset",3,"three");
        jedis.zadd("myset",4,"four");
        System.out.println("获取指定区间元素的个数："+jedis.zcount("myset", 0, 3));
    }
}

输出：

Connected to the target VM, address: '127.0.0.1:59609', transport: 'socket'
查看全部的值：[one, two, three]
由高到低排序：[lisi, zhangsan, wangwu]
由高到低排序：[wangwu, zhangsan, lisi]
查看全部的值：[lisi, zhangsan, wangwu]
查看全部的值：[zhangsan, wangwu]
查看所有元素的个数：2
获取指定区间元素的个数：3

通过Jedis再次理解事务

1.正常执行事务

package com.beiluo;

import com.alibaba.fastjson.JSONObject;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Transaction;

import java.util.Random;

public class TestTransaction {
    public static void main(String[] args) {

        Jedis jedis = new Jedis("127.0.0.1",6379);

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("username","lq");
        jsonObject.put("age",23);

        //开启事务
        Transaction transaction =jedis.multi();
        
        String result = jsonObject.toJSONString();

        //jedis.watch(result);

        try{
            transaction.set("user1",result);
            transaction.set("user2",result);

            //执行事务
            transaction.exec();
        }catch (Exception e){

            //放弃事务
            transaction.discard();
            e.printStackTrace();
        }finally {
            System.out.println(jedis.get("user1"));
            System.out.println(jedis.get("user2"));

            //关闭连接
            jedis.close();
        }
    }
}

输出：

在这里插入图片描述

加入异常代码测试

 //事务执行失败，代码发送异常
 int i = 1/0;

输出：
在这里插入图片描述

posted @ 2020-05-17 17:19 我有满天星辰阅读(5) 评论(0) 编辑收藏举报

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6.Jedis相关API和事务操作

Jedis

常用的API

1.测试key

2.测试String

3.测试List

4.测试Set

5.测试Hash

6.测试Zset

通过Jedis再次理解事务

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