Java连接redis及基本操作示例

Z时代
2024-01-10
分类：综合

本文实例讲述了Java连接redis及基本操作。分享给大家供大家参考，具体如下：

点击此处：本站下载安装。

解压安装

启动redis：使用cd命令切换目录到 D:\redis运行redis-server.exe redis.windows.conf

默认端口为6379

访问：切换到redis目录下运行 redis-cli.exe -h 127.0.0.1 -p 6379。

pom.xml:


<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>testRedis</groupId>
 <artifactId>testRedis</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <build/>
 <dependencies>
  <!-- Redis NoSQL 操作依赖 -->
    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>2.1.0</version>
    </dependency>
 </dependencies>
</project>

测试代码：


package com.crisy.redis;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.JedisShardInfo;
import redis.clients.jedis.ShardedJedis;
import redis.clients.jedis.ShardedJedisPool;
public class RedisClient {
 /**
 * 一般项目基本都使用非切片池；
 * 切片池主要用于分布式项目，可以设置主从Redis库
 */
 private Jedis jedis;//非切片客户端连接
 private JedisPool jedisPool;//非切片连接池
 private ShardedJedis shardedJedis;//切片客户端连接
 private ShardedJedisPool shardedJedisPool;//切片连接池
 public RedisClient(){ 
    initialPool(); //初始化非切片连接池
    initialShardedPool(); //初始化切片连接池
    shardedJedis = shardedJedisPool.getResource(); 
    jedis = jedisPool.getResource(); 
  }
 private void initialPool() {
 JedisPoolConfig config = new JedisPoolConfig();
 config.setMaxActive(20);
 config.setMaxIdle(5);
 config.setMaxWait(100001);
 config.setTestOnBorrow(false);
 jedisPool = new JedisPool(config,"127.0.0.1",6379);
 } 
 private void initialShardedPool() {
 JedisPoolConfig config = new JedisPoolConfig();
 config.setMaxActive(20);
 config.setMaxIdle(5);
 config.setMaxWait(100001);
 config.setTestOnBorrow(false);
 //slave连接
 List<JedisShardInfo> shardInfos = new ArrayList<JedisShardInfo>();
 shardInfos.add(new JedisShardInfo("127.0.0.1",6379,"master"));
 //构造池
 shardedJedisPool = new ShardedJedisPool(config, shardInfos);
 }
 public void show(){
 System.out.println("----对Value操作的命令----");
 valueOperate();
 System.out.println("----对String操作的命令----");
 stringOperator();
 System.out.println("----对List操作的命令----");
 listOperator();
 System.out.println("----对Set操作的命令----");
 setOperator();
 System.out.println("----对hash操作的命令----");
 hashOperate();
 }
 /**
 * 对Value操作的命令
 * @throws InterruptedException 
 */
 private void valueOperate(){
 System.out.println("清空当前选择库中所有key："+jedis.flushDB());
 System.out.println("清空所有库中所有key："+jedis.flushAll());
 System.out.println("判断myKey键是否存在："+shardedJedis.exists("myKey")); 
 System.out.println("新增myKey："+shardedJedis.set("myKey","myValue")); 
 System.out.println("判断myKey键是否存在："+shardedJedis.exists("myKey")); 
 System.out.println("查看myKey所储存的值的类型："+jedis.type("myKey"));
 System.out.println("重命名myKey-myKey_1："+jedis.rename("myKey", "myKey_1")); 
 System.out.println("判断myKey键是否存在："+shardedJedis.exists("myKey")); 
 System.out.println("判断myKey_1键是否存在："+shardedJedis.exists("myKey_1")); 
 System.out.println("新增myKey_2："+shardedJedis.set("myKey_2","myValue_2")); 
 System.out.println("查看索引为0的Key："+jedis.select(0));
 System.out.println("当前数据库中key的数目："+jedis.dbSize());
 System.out.println("系统中所有键如下：");
 //返回满足给定pattern的所有key
    Set<String> keys = jedis.keys("*"); 
    Iterator<String> it=keys.iterator() ;  
    while(it.hasNext()){  
      String key = it.next();  
      System.out.println(key);  
    }
    //删除时，如果不存在忽略此命令
    System.out.println("系统中删除myKey_3: "+jedis.del("myKey_3"));
    System.out.println("系统中删除myKey_2: "+jedis.del("myKey_2"));
    System.out.println("判断myKey_2是否存在："+shardedJedis.exists("myKey_2"));
    System.out.println("设置 myKey_1的过期时间为5秒:"+jedis.expire("myKey_1", 5));
    try {
  Thread.sleep(2000);
 } catch (InterruptedException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 } 
    //没有设置过期时间或者不存在的都返回-1
    System.out.println("获得myKey_1的剩余活动时间："+jedis.ttl("myKey_1"));
    System.out.println("取消设置myKey_1的活动时间："+jedis.persist("myKey_1"));
    System.out.println("查看myKey_1的剩余活动时间："+jedis.ttl("myKey_1"));
 }
 /**
 * 对String操作的命令
 */
 private void stringOperator(){
 System.out.println("清空当前选择库中所有key："+jedis.flushDB());
 System.out.println("给数据库中名称为key01的string赋予值value："+jedis.set("key01", "value01"));
 System.out.println("给数据库中名称为key02的string赋予值value："+jedis.set("key02", "value02"));
 System.out.println("给数据库中名称为key03的string赋予值value："+jedis.set("key03", "value03"));
 System.out.println("返回数据库中名称为key01的string的value："+jedis.get("key01"));
 System.out.println("返回库中多个string的value："+jedis.mget("key01","key02","key03"));
 System.out.println("添加string，名称为key，值为value："+jedis.setnx("key04","value04"));
 System.out.println("向库中添加string，设定过期时间time："+jedis.setex("key05",5,"value05"));
 System.out.println("批量设置多个string的值："+jedis.mset("key06_1","value06_1","key06_2","value06_2"));
 System.out.println("给数据库中名称为key07的string赋予值value："+jedis.set("key07", "1"));
 System.out.println("名称为key07的string增1操作："+jedis.incr("key07"));
 //ERR value is not an integer or out of range
 //System.out.println("名称为key01的string增1操作："+jedis.incr("key01"));
 System.out.println("名称为key07的string增加integer："+jedis.incrBy("key07", 5));
 System.out.println("名称为key07的string减1操作："+jedis.decr("key07"));
 System.out.println("名称为key07的string减少integer："+jedis.decrBy("key07", 3));
 System.out.println("名称为key的string的值附加value："+jedis.append("key01","Hello World"));
 System.out.println("返回名称为key的string的value的子串："+jedis.substr("key01",0,5));
 }
 /**
 * 对List操作的命令
 */
 private void listOperator(){
 System.out.println("清空当前选择库中所有key："+jedis.flushDB());
 //准备两个list
 shardedJedis.lpush("mylist", "Java"); 
    shardedJedis.lpush("mylist", "C"); 
    shardedJedis.lpush("mylist", "C++");
    shardedJedis.lpush("mylist", "Java");
 System.out.println("在名称为mylist的list尾添加一个值为value的元素："+jedis.rpush("mylist","phython"));
 System.out.println("在名称为mylist的list头添加一个值为value的 元素："+jedis.rpush("mylist","PHP"));
 System.out.println("返回名称为mylist的list的长度："+jedis.llen("mylist"));
 System.out.println("返回名称为mylist中start至end之间的元素："+jedis.lrange("mylist",0,3));
 System.out.println("截取名称为mylist的list："+jedis.ltrim("mylist",0,3));
 System.out.println("返回名称为mylist的list中index位置的元素："+jedis.lindex("mylist",0));
 System.out.println("给名称为mylist的list中index位置的元素赋值："+jedis.lset("mylist",0,"hahahahah我改啦"));
 System.out.println("删除count个mylist的key中值为value的元素："+jedis.lrem("mylist",1,"Java"));
 System.out.println("返回并删除名称为mylist的list中的首元素："+jedis.lpop("mylist"));
 System.out.println("返回并删除名称为mylist的list中的尾元素："+jedis.rpop("mylist"));
 }
 /**
 * 对Set操作的命令
 */
 private void setOperator(){
 System.out.println("清空当前选择库中所有key："+jedis.flushDB());
 //准备两个set
 jedis.sadd("myset","hahaha");
 jedis.sadd("myset","hahaha");
 jedis.sadd("myset","lalala");
 jedis.sadd("myset","kakaka");
 jedis.sadd("myset2","hahaha");
 jedis.sadd("myset2","lalala");
 jedis.sadd("myset2","kakaka");
 System.out.println("向名称为myset的set中添加元素member："+jedis.sadd("myset","wawawa"));
 System.out.println("返回名称为myset的set的所有元素："+jedis.smembers("myset"));
 System.out.println("删除名称为myset的set中的元素member："+jedis.srem("myset","wawawa"));
 System.out.println("返回名称为myset的set的所有元素："+jedis.smembers("myset"));
 System.out.println("随机返回并删除名称为myset的set中一个元素："+jedis.spop("myset"));
 System.out.println("移到集合元素："+jedis.smove("myset","myset2","hahaha"));
 System.out.println("返回名称为myset的set的所有元素："+jedis.smembers("myset"));
 System.out.println("返回名称为myset2的set的所有元素："+jedis.smembers("myset2"));
 System.out.println("返回名称为mykey的set的基数："+jedis.scard("myset"));
 System.out.println("member是否是名称为mykey的set的元素："+jedis.sismember("myset","hahaha"));
 System.out.println("求交集："+jedis.sinter("myset","myset2"));
 System.out.println("求交集并将交集保存到dstkey的集合："+jedis.sinterstore("dstkey","myset2","myset"));
 System.out.println("返回名称为dstkey的set的所有元素："+jedis.smembers("dstkey"));
 System.out.println("求并集："+jedis.sunion("myset","myset2"));
 System.out.println("求并集并将并集保存到dstkey的集合："+jedis.sinterstore("dstkey","myset2","myset"));
 System.out.println("返回名称为dstkey的set的所有元素："+jedis.smembers("dstkey"));
 System.out.println("求差集："+jedis.sdiff("myset2","myset"));
 System.out.println("求差集并将差集保存到dstkey的集合："+jedis.sdiffstore("dstkey","myset2","myset"));
 System.out.println("返回名称为dstkey的set的所有元素："+jedis.smembers("dstkey"));
 System.out.println("随机返回名称为dstkey的set的一个元素："+jedis.srandmember("dstkey"));
 }
 /**
 * hash
 */
 private void hashOperate(){
 System.out.println(jedis.flushDB());
 System.out.println("向名称为key的hash中添加元素field1："+shardedJedis.hset("key", "field1", "value1")); 
    System.out.println("向名称为key的hash中添加元素field2："+shardedJedis.hset("key", "field2", "value2")); 
    System.out.println("向名称为key的hash中添加元素field3："+shardedJedis.hset("key", "field3", "value3"));
    System.out.println("返回名称为key的hash中field1对应的value："+shardedJedis.hget("key", "field1"));
    System.out.println("返回名称为key的hash中field1对应的value："+shardedJedis.hmget("key", "field1","field2","field3"));
    System.out.println("删除名称为key的hash中键为field1的域："+shardedJedis.hdel("key", "field1"));
    System.out.println("返回名称为key的hash中所有键对应的value："+shardedJedis.hvals("key"));
    System.out.println("返回名称为key的hash中元素个数："+shardedJedis.hlen("key"));
    System.out.println("返回名称为key的hash中所有键："+shardedJedis.hkeys("key"));
    System.out.println("返回名称为key的hash中所有的键（field）及其对应的value："+shardedJedis.hgetAll("key"));
    System.out.println("名称为key的hash中是否存在键为field1的域："+shardedJedis.hexists("key","field1"));
 }
}