Redis-Jedis
# Redis-Jedis
# 1. 什么是Jedis?
Jedis 是 Redis 官方推荐的 java连接开发工具! 使用Java 操作Redis 中间件!如果你要使用java操作redis,那么一定要对Jedis 十分的熟悉!
# 2. 测试
# 2.1 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>
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# 2.2 测试连接
/**
* @Author: CHGGX
* @Description: <h1> 测试Jedis连接redis </h1>
*/
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());
}
}
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E:\develop\Java\jdk1.8.0_91\bin\java.exe "......
PONG
Process finished with exit code 0
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# 3. 常用API
所有的api命令,就是我们对应的redos的指令,一个都没有变化!
# 3.1 Redis-Key
/**
* @author CHGGX
*/
public class 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", "chggx"));
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());
}
}
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# 3.2 String (字符串)
/**
* @author CHGGX
* 测试String类型
*/
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("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("key01","value01","key02","value02","key03","value03"));
System.out.println("获取多个键值对:"+jedis.mget("key01","key02","key03"));
System.out.println("获取多个键值对:"+jedis.mget("key01","key02","key03","key04"));
System.out.println("删除多个键值对:"+jedis.del("key01","key02"));
System.out.println("获取多个键值对:"+jedis.mget("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(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("获得key2的值的字串:"+jedis.getrange("key2", 2, 4));
}
}
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# 3.3 List (列表)
/**
* @author CHGGX
*/
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", "WeakHashMap", "LinkedHashMap");
jedis.lpush("collections", "HashSet");
jedis.lpush("collections", "TreeSet");
jedis.lpush("collections", "TreeMap");
// -1代表倒数第一个元素,-2代表倒数第二个元素,end为-1表示查询全部
System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
System.out.println("collections区间0-3的元素:"+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,类似于出栈
System.out.println("删除指定元素个数:"+jedis.lrem("collections", 2, "HashMap"));
System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
System.out.println("删除下表0-3区间之外的元素:"+jedis.ltrim("collections", 0, 3));
System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈(左端):"+jedis.lpop("collections"));
System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
System.out.println("collections添加元素,从列表右端,与lpush相对应:"+jedis.rpush("collections", "EnumMap"));
System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈(右端):"+jedis.rpop("collections"));
System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
System.out.println("修改collections指定下标1的内容:"+jedis.lset("collections", 1, "LinkedArrayList"));
System.out.println("collections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collections下标为2的元素:"+jedis.lindex("collections", 2));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前:"+jedis.lrange("sortedList", 0, -1));
System.out.println(jedis.sort("sortedList"));
System.out.println("sortedList排序后:"+jedis.lrange("sortedList", 0, -1));
}
}
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# 3.4 Set (集合)
/**
* @author CHGGX
*/
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("eleSet", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet", "e6"));
System.out.println(jedis.sadd("eleSet", "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", "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", "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", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet2", "e1","e2","e4","e3","e0","e8"));
// 移到集合元素
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("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的并集:"+jedis.sunion("eleSet1","eleSet2"));
// eleSet1中有,eleSet2中没有
System.out.println("eleSet1和eleSet2的差集:"+jedis.sdiff("eleSet1","eleSet2"));
// 求交集并将交集保存到dstkey的集合
jedis.sinterstore("eleSet4","eleSet1","eleSet2");
System.out.println("eleSet4中的元素:"+jedis.smembers("eleSet4"));
}
}
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# 3.5 Hash
/**
* @author CHGGX
*/
public class TestHash {
public static void main(String[] args) {
Jedis jedis = new Jedis("127.0.0.1", 6379);
jedis.flushDB();
Map<String,String> map = new HashMap<String,String>();
map.put("key1","value1");
map.put("key2","value2");
map.put("key3","value3");
map.put("key4","value4");
//添加名称为hash(key)的hash元素
jedis.hmset("hash",map);
//向名称为hash的hash中添加key为key5,value为value5元素
jedis.hset("hash", "key5", "value5");
// return Map<String,String>
System.out.println("散列hash的所有键值对为:"+jedis.hgetAll("hash"));
// return Set<String>
System.out.println("散列hash的所有键为:"+jedis.hkeys("hash"));
// return List<String>
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", 6));
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", 3));
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", "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","key3"));
System.out.println("获取hash中的值:"+jedis.hmget("hash","key3","key4"));
}
}
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# 4. 事务
/**
* @author CHGGX
*/
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("hello","world");
jsonObject.put("name","chggx");
// 开启事务
Transaction multi = jedis.multi();
String result = jsonObject.toJSONString();
// jedis.watch(result);
try {
multi.set("user1",result);
multi.set("user2",result);
// 代码抛出异常事务,执行失败!
int i = 1/0 ;
// 执行事务!
multi.exec();
} catch (Exception e) {
// 放弃事务
multi.discard();
e.printStackTrace();
} finally {
System.out.println(jedis.get("user1"));
System.out.println(jedis.get("user2"));
// 关闭连接
jedis.close();
}
}
}
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同redis命令
上次更新: 2023/03/27, 08:56:25