Redis（Remote Dictionary Server，远程数据字典服务器）是一个开源的高性能内存数据库，常用作缓存服务器使用，也做消息队列使用。因其高性能、丰富的数据类型、可扩展等特性受开发者青睐，这里介绍在java中使用Jedis操作Redis的基本用法。
1. 字符串String。
package com.zws.redis.examples;
import java.util.concurrent.TimeUnit;
import redis.clients.jedis.Jedis;
public class RedisString {
public static void main(String[] args) throws InterruptedException {
String host = "192.168.137.131";
int port = 6379;
String password = "redis";
Jedis jedis = new Jedis(host, port);
jedis.auth(password);
jedis.ping();
jedis.set("name", "张三"); //设置
jedis.set("age", "23");
String name = jedis.get("name");//获取
String age = jedis.get("age");
System.out.println("name:" + name + ",age:" + age);
jedis.set("name", "李四"); //覆盖
name = jedis.get("name");
System.out.println("name:" + name);
jedis.append("name", "-尼古拉斯"); //追加
name = jedis.get("name");//获取
age = jedis.get("age");
System.out.println("name:" + name + ",age:" + age);
jedis.del("name"); //删除
name = jedis.get("name");
System.out.println("name:" + name);
jedis.del("name", "age"); //删除多个key
name = jedis.get("name");//获取
age = jedis.get("age");
System.out.println("name:" + name + ",age:" + age);
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("key1:" + jedis.get("key1"));
System.out.println("key2:" + 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"));
TimeUnit.SECONDS.sleep(3);
System.out.println("key3:" + jedis.get("key3"));
System.out.println("===========获取原值，更新为新值==========");
//GETSET is an atomic set this value and return the old value command.
System.out.println(jedis.getSet("key2", "key2GetSet"));
System.out.println("key2:" + jedis.get("key2"));
System.out.println("截取key2的值：" + jedis.getrange("key2", 2, 4));
jedis.close();
}
}2. 集合List。
package com.zws.redis.examples;
import java.util.List;
import redis.clients.jedis.Jedis;
public class RedisList {
public static void main(String[] args) {
String host = "192.168.137.131";
int port = 6379;
Jedis jedis = new Jedis(host, port);
jedis.auth("redis");
jedis.ping();
System.out.println("===========添加一个list===========");
Long cnt = jedis.del("collections");
System.out.println("del cnt:" + cnt);
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
jedis.lpush("collections", "HashSet");
jedis.lpush("collections", "TreeSet");
jedis.lpush("collections", "TreeMap");
jedis.lpush("collections", "BrrayList");
jedis.lpush("collections", "CrrayList");
jedis.lpush("collections", "CrrayList");
List<String> collections = jedis.lrange("collections", 0, -1);
System.out.println("collections的内容：" + collections);//-1代表倒数第一个元素，-2代表倒数第二个元素, 倒序出来
System.out.println("collections区间0-3的元素："+jedis.lrange("collections", 0, 3));// 倒序出来
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("删除下标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.del("sortedList");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println("sortedList返回有序：" + jedis.sort("sortedList"));
System.out.println("sortedList排序后："+jedis.lrange("sortedList", 0, -1));
jedis.close();
//Redis中还有阻塞式的列表弹出命令以及在列表之间移动元素的命令：blpop, brpop, rpoplpush, brpoplpush等。
}
}3. 散列HashMap。
package com.zws.redis.examples;
import java.util.HashMap;
import java.util.Map;
import redis.clients.jedis.Jedis;
public class RedisHashMap {
public static void main(String[] args) throws InterruptedException {
String host = "192.168.137.131";
int port = 6379;
String password = "redis";
Jedis jedis = new Jedis(host, port);
jedis.auth(password);
jedis.ping();
jedis.del("hash");
Map<String,String> map = new HashMap<String, String>();
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", 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"));
jedis.close();
}
}4. Set。
package com.zws.redis.examples;
import redis.clients.jedis.Jedis;
public class RedisSet {
public static void main(String[] args) throws InterruptedException {
String host = "192.168.137.131";
int port = 6379;
String password = "redis";
Jedis jedis = new Jedis(host, port);
jedis.auth(password);
jedis.ping();
jedis.del("eleSet");
System.out.println("============向集合中添加元素============");
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("e2是否在eleSet中：" + jedis.sismember("eleSet", "e2"));
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"));
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"));
System.out.println("eleSet1和eleSet2的差集:" + jedis.sdiff("eleSet1", "eleSet2"));// eleSet1中有，eleSet2中没有
//关于Set还有一些其他命令：srandmember, sdiffstore, sinterstore, sunionstore等。
jedis.close();
}
}5.排序Sort
package com.zws.redis.examples;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.SortingParams;
public class RedisSort {
public static void main(String[] args) {
String host = "192.168.137.131";
int port = 6379;
String password = "redis";
Jedis jedis = new Jedis(host, port);
jedis.auth(password);
jedis.ping();
jedis.del("collections", "sortedList");
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
System.out.println("collections的内容：" + jedis.lrange("collections", 0, -1));
SortingParams sortingParameters = new SortingParams();
System.out.println("返回升序集合：" + jedis.sort("collections", sortingParameters.alpha().asc()));
System.out.println("返回降序集合：" + jedis.sort("collections", sortingParameters.alpha().desc()));
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("sortedList升序：" + jedis.sort("sortedList", sortingParameters.asc()));
System.out.println("sortedList降序：" + jedis.sort("sortedList", sortingParameters.desc()));
System.out.println("===============================");
jedis.lpush("userlist", "33");
jedis.lpush("userlist", "22");
jedis.lpush("userlist", "55");
jedis.lpush("userlist", "11");
jedis.hset("user:66", "name", "66");
jedis.hset("user:55", "name", "55");
jedis.hset("user:33", "name", "33");
jedis.hset("user:22", "name", "79");
jedis.hset("user:11", "name", "24");
jedis.hset("user:11", "add", "beijing");
jedis.hset("user:22", "add", "shanghai");
jedis.hset("user:33", "add", "guangzhou");
jedis.hset("user:55", "add", "chongqing");
jedis.hset("user:66", "add", "xi'an");
sortingParameters = new SortingParams();
sortingParameters.get("user:*->name");
sortingParameters.get("user:*->add");
System.out.println(jedis.sort("userlist", sortingParameters));
jedis.close();
}
}6. 排序集合SortedSet.
package com.zws.redis;
import java.util.HashMap;
import java.util.Map;
import redis.clients.jedis.Jedis;
public class RedisSortedSet {
public static void main(String[] args) {
String host = "192.168.137.131";
int port = 6379;
Jedis jedis = new Jedis(host, port);
jedis.auth("redis");
jedis.ping();
jedis.del("englishScore");
Map<String, Double> englishScore = new HashMap<String, Double>();
englishScore.put("熊大", 56D);
englishScore.put("熊二", 67.9D);
englishScore.put("张三", 90D);
englishScore.put("李四", 60D);
englishScore.put("王五", 40D);
System.out.println(jedis.zadd("englishScore", 39D,"赵六"));
System.out.println(jedis.zadd("englishScore", englishScore));
System.out.println("englishScore中的所有元素："+jedis.zrange("englishScore", 0, -1));
System.out.println("englishScore中的所有元素："+jedis.zrangeWithScores("englishScore", 0, -1));
System.out.println("englishScore中的所有元素："+jedis.zrangeByScore("englishScore", 0,100));
System.out.println("englishScore中的所有元素："+jedis.zrangeByScoreWithScores("englishScore", 0,100));
System.out.println("englishScore中张三的分值："+jedis.zscore("englishScore", "张三"));
System.out.println("englishScore中张三的排名："+jedis.zrank("englishScore", "张三"));
System.out.println("删除englishScore中的元素张三："+jedis.zrem("englishScore", "张三"));
System.out.println("englishScore中的所有元素："+jedis.zrange("englishScore", 0, -1));
System.out.println("englishScore中元素的个数："+jedis.zcard("englishScore"));
System.out.println("englishScore中分值在60-100之间的元素的个数："+jedis.zcount("englishScore", 60, 100));
System.out.println("熊大的分值加上5："+jedis.zincrby("englishScore", 5, "熊大"));
System.out.println("熊二的分值加上4："+jedis.zincrby("englishScore", 4, "熊二"));
System.out.println("englishScore中的所有元素："+jedis.zrange("englishScore", 0, -1));
jedis.close();
}
}7. key相关
package com.zws.redis.examples;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import redis.clients.jedis.Jedis;
public class RedisKey {
public static void main(String[] args) throws InterruptedException {
String host = "192.168.137.131";
int port = 6379;
Jedis jedis = new Jedis(host, port);
jedis.auth("redis");
jedis.ping();
System.out.println("是否存在username：" + jedis.exists("username"));
System.out.println("新增<'username','zzh'>的键值对：" + jedis.set("username", "zzh"));
System.out.println("是否存在username：" + jedis.exists("username"));
System.out.println("新增<'password','password'>的键值对：" + jedis.set("password", "password"));
Set<String> keys = jedis.keys("*");
System.out.println("系统中所有的键：" + 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("设置键username的过期时间为5s:" + jedis.expire("username", 5));
TimeUnit.SECONDS.sleep(2);
System.out.println("查看键username的剩余生存时间：" + jedis.ttl("username"));
System.out.println("移除键username的生存时间：" + jedis.persist("username"));
System.out.println("查看键username的剩余生存时间：" + jedis.ttl("username"));
System.out.println("查看键username所存储的值的类型：" + jedis.type("username"));
jedis.close();
}
}来源：oschina
链接：https://my.oschina.net/u/4382844/blog/4344786