Redis是什么
一种数据库,但是不是mysql那样的表格,而是key-value的形式存储,而且它存在内存里,所以读写速度更快。
Redis常用数据类型
Redis常用命令简单使用
字符串操作
set name x
get name
哈希操作
列表操作
集合操作
有序集合操作
通用操作
在Java中操作Redis
配置Redis数据源
方法1
application.yml下的datasource
redis:host: localhostport: 6379database: 0
方法2(推荐)
配置类
package com.sky.config;import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;@Configuration
@Slf4j
public class RedisConfiguration {@Beanpublic RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory){RedisTemplate redisTemplate = new RedisTemplate();//设置redis的连接工厂对象redisTemplate.setConnectionFactory(redisConnectionFactory);//设置redis key的序列化器redisTemplate.setKeySerializer(new StringRedisSerializer());return redisTemplate;}
}
写一个测试类看看是否好使
package com.sky.test;import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;@SpringBootTest
public class SpringDataRedisTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testRedisTemplate(){System.out.println(redisTemplate);}
}
在测试类里的运行结果
在java中操作字符串类型
package com.sky.test;import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.*;import java.util.concurrent.TimeUnit;@SpringBootTest
public class SpringDataRedisTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testRedisTemplate(){System.out.println(redisTemplate);ValueOperations valueOperations=redisTemplate.opsForValue();HashOperations hashOperations = redisTemplate.opsForHash();ListOperations listOperations = redisTemplate.opsForList();SetOperations setOperations = redisTemplate.opsForSet();ZSetOperations zSetOperations = redisTemplate.opsForZSet();}/*** 操作字符串类型的数据*/@Testpublic void testString(){redisTemplate.opsForValue().set("city","北京");String city = (String) redisTemplate.opsForValue().get("city");System.out.println(city);//setexredisTemplate.opsForValue().set("code","1234",3, TimeUnit.MINUTES);//3分钟//setnxredisTemplate.opsForValue().setIfAbsent("lock",1);//成功redisTemplate.opsForValue().setIfAbsent("lock",2);//不成功}
}
在java中操作哈希类型
/*** 哈希*/@Testpublic void testHash(){HashOperations hashOperations = redisTemplate.opsForHash();//hsethashOperations.put("100","name","tom");hashOperations.put("100","age","20");//hgetString name = (String) hashOperations.get("100", "name");System.out.println(name);//hkeysSet keys = hashOperations.keys("100");System.out.println(keys);//hvalsList values = hashOperations.values("100");System.out.println(values);//hdelhashOperations.delete("100","age");}