Redis-Jedis 通过Java程序来操纵Redis数据库（五大数据类型方法的测试！事务的测试）
文章目录
- 通过Java程序来操纵Redis数据库
- 什么是Jedis？
- Jedis的使用
- 1、首先我们要创建一个普通的maven项目
- 2、导入Jedis的包
- 3、测试连接
- 4、关于Redis-key基本方法的使用
- 测试五大数据类型的使用
- 1.String
- 2.List
- 3.Set
- 4.Hash
- 5.Zset
- 事务
通过Java程序来操纵Redis数据库
终于到了用我们的Java程序来操纵Redis数据库的环节啦~还是程序写着舒坦
什么是Jedis？
它是官方推荐的Java连接开发工具！使用Java操纵Redis的中间件！说白了就是一个包，我们导入程序就可以使用了~
Jedis的使用
那么到底怎样去使用它呢？别急慢慢来~
1、首先我们要创建一个普通的maven项目
2、导入Jedis的包
另外，json的包我们也可能会用得到，也一起导进来！
<dependencies>
<dependency>
<groupId>redis.clientsgroupId>
<artifactId>jedisartifactId>
<version>3.2.0version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>fastjsonartifactId>
<version>1.2.62version>
dependency>
dependencies>3、测试连接
注意：我这里用的是windows系统连接本地的服务，就得在windows中也装上redis，并启动服务，才可连接成功！
package com.gang;
/*
Description:测试连接
Author:32259
Time:2020四月2020/4/316:15
*/
import redis.clients.jedis.Jedis;
public class TestPing {
public static void main(String[] args) {
//new Jedis对象即可
Jedis jedis = new Jedis("127.0.0.1", 6379);
//jedis所有的方法都是我之前博客里写的那些命令！只不过在这里成为了方法
System.out.println(jedis.ping());
}
}查看测试结果：连接成功！
下面是一些基本方法的使用测试！对应我以前博客中redis的命令，这里只不过变成了方法而已！
4、关于Redis-key基本方法的使用
package com.gang;
/*
Description:测试普通键key
Author:32259
Time:2020四月2020/4/316:40
*/
import redis.clients.jedis.Jedis;
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','fanmenggang'>的键值对:"+jedis.set("username","fanmenggang"));
System.out.println("新增<'password','123456'>的键值对:"+jedis.set("password","123456"));
System.out.println("查看系统中所有的键:"+jedis.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中的一个:"+jedis.randomKey());
System.out.println("重命名key:"+jedis.rename("username","root"));
System.out.println("取出改名后root键的值:"+jedis.get("root"));
System.out.println("切换到2号数据库:"+jedis.select(2));
System.out.println("查看2号数据库中的所有键（当然里面没存东西）:"+jedis.keys("*"));
System.out.println("新增<'username','gangzi'>的键值对:"+jedis.set("username","gangzi"));
System.out.println("切换回0号数据库:"+jedis.select(0));
System.out.println("查看0号数据库中的所有键:"+jedis.keys("*"));
System.out.println("删除当前数据库中的所有key:"+jedis.flushDB());
System.out.println("返回当前数据库的大小（key的数目）:"+jedis.dbSize());
System.out.println("清空所有的数据库:"+jedis.flushAll());
System.out.println("查看2号数据库中还有没有username这个键:"+jedis.keys("*"));
}
}
结果：
测试五大数据类型的使用
1.String
package com.gang;
/*
Description:测试String类型
Author:32259
Time:2020四月2020/4/317:22
*/
import redis.clients.jedis.Jedis;
import java.util.concurrent.TimeUnit;
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("k1","v1"));
System.out.println(jedis.set("k2","v2"));
System.out.println(jedis.set("k3","v3"));
System.out.println("删除键k2："+jedis.del("k2"));
System.out.println("获取键k2："+jedis.get("k2"));
System.out.println("修改k1："+jedis.set("k1","v1changed"));
System.out.println("获取k1的值："+jedis.get("k1"));
System.out.println("在k3后面拼接值："+jedis.append("k3","End"));
System.out.println("获取k3的值："+jedis.get("k3"));
System.out.println("增加多个键值对："+jedis.mset("key1","value1","key2","value2"));
System.out.println("获取多个键的值："+jedis.mget("k1","k2","key1","key2"));
System.out.println("删除多个键："+jedis.del("k1","key1"));
jedis.flushDB();
System.out.println("==========新增键值对防止覆盖原先值=========");
System.out.println(jedis.setnx("k1","v1"));
System.out.println(jedis.setnx("k2","v2"));
System.out.println(jedis.setnx("k2","v8"));
System.out.println(jedis.get("k1"));
System.out.println(jedis.get("k2"));
System.out.println("==========新增键值对并设置有效时间=========");
System.out.println(jedis.setex("k3",5,"v3"));
System.out.println(jedis.get("k3"));
try {
//休眠6秒
TimeUnit.SECONDS.sleep(6);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(jedis.get("k3"));
System.out.println("========获取原来的值，并更新为新的值=========");
System.out.println(jedis.getSet("k2","v2xinzhi"));
System.out.println(jedis.get("k2"));
System.out.println("截取指定下标的字符串："+jedis.getrange("k2",3,6));
}
}
结果：
2.List
package com.gang;
/*
Description:测试List
Author:32259
Time:2020四月2020/4/319:43
*/
import redis.clients.jedis.Jedis;
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"));
}
}
结果：
3.Set
package com.gang;
/*
Description:测试Set
Author:32259
Time:2020四月2020/4/320:13
*/
import redis.clients.jedis.Jedis;
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"));
}
}
结果：
4.Hash
package com.gang;
/*
Description:测试Hash
Author:32259
Time:2020四月2020/4/321:31
*/
import redis.clients.jedis.Jedis;
import java.util.HashMap;
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<>();
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"));
}
}
结果：
5.Zset
package com.gang;
/*
Description:测试Zset
Author:32259
Time:2020四月2020/4/321:48
*/
import redis.clients.jedis.Jedis;
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));
}
}
结果：
事务
- 正常运行
package com.gang;
/*
Description:测试事务
Author:32259
Time:2020四月2020/4/322:15
*/
import com.alibaba.fastjson.JSONObject;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Transaction;
public class TestTX {
public static void main(String[] args) {
Jedis jedis = new Jedis("127.0.0.1", 6379);
JSONObject jsonObject = new JSONObject();
jsonObject.put("name","fanmenggang");
jsonObject.put("sex","nan");
//开启事务
Transaction multi = jedis.multi();
String s = jsonObject.toJSONString();
try {
multi.set("user1",s);
multi.set("user2","haha");
multi.exec();//执行事务
}catch (Exception e){
multi.discard();//放弃事务
e.printStackTrace();
}finally {
System.out.println(jedis.get("user1"));
System.out.println(jedis.get("user2"));
jedis.close();//关闭连接
}
}
}结果：
- 测试原子性，模拟运行时异常，语法错误
package com.gang;
/*
Description:测试事务
Author:32259
Time:2020四月2020/4/322:15
*/
import com.alibaba.fastjson.JSONObject;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Transaction;
public class TestTX {
public static void main(String[] args) {
Jedis jedis = new Jedis("127.0.0.1", 6379);
JSONObject jsonObject = new JSONObject();
jsonObject.put("name","fanmenggang");
jsonObject.put("sex","nan");
//开启事务
Transaction multi = jedis.multi();
String s = jsonObject.toJSONString();
try {
multi.set("user1",s);
multi.set("user2","haha");
multi.incrBy("user2",5);//模拟运行时异常，语法错误，字符串不能进行自增，证明事务不保证原子性
multi.exec();//执行事务
}catch (Exception e){
multi.discard();//放弃事务
e.printStackTrace();
}finally {
System.out.println(jedis.get("user1"));
System.out.println(jedis.get("user2"));
jedis.close();//关闭连接
}
}
}结果：
