jedis
java操作redis
jedis是官方推荐的java连接开发工具
maven依赖
<!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>3.5.2</version>
</dependency>
编写java代码
public class redisText {
public static void main(String[] args) {
Jedis jedis = new Jedis("192.168.31.193",6379);
System.out.println(jedis.ping());
System.out.println(jedis.set("name","blank"));
System.out.println(jedis.set("age","age"));
System.out.println(jedis.get("name"));
}
}
失败原因1
Exception in thread “main“ redis.clients.jedis.exceptions.JedisDataException
关闭受保护模式
进入redis
config set protected-mode "no"
是说Redis服务处于保护模式,我们需要修改配置文件redis.conf。将NETWORK下的protected-mode yes修改
为protected-mode no,然后重启服务(./bin/redis-server ./redis.conf)
blank@ubuntu:~/桌面$ cd /usr/local/bin/bconfig
blank@ubuntu:/usr/local/bin/bconfig$ ls
redis.conf
blank@ubuntu:/usr/local/bin/bconfig$ sudo gedit redis.conf
blank@ubuntu:~$redis-server /usr/local/bin/bconfig/redis.conf
java.net.SocketTimeoutException: connect timed out
解决:关闭bind:127.0.0.1 ::1
进入配置文件注释这一句
blank@ubuntu:~/桌面$ cd /usr/local/bin/bconfig blank@ubuntu:/usr/local/bin/bconfig$ ls redis.conf blank@ubuntu:/usr/local/bin/bconfig$ sudo gedit redis.conf blank@ubuntu:~$redis-server /usr/local/bin/bconfig/redis.conf
测试运行
PONG OK OK blank
全部的命令都可以使用
jedis.方法运行
jedis事务
Transaction multi = jedis.multi(); try{ multi.set("hello","world"); multi.ecec(); }catch(Exception e){ multi.discard(); }finally{ sout(jedis.get("hello")); jedis.close(); }
Spring Boot整合
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency>
在SpringBoot 2.x以后 , jedis被替换成了 lettuce
jedis: 采用直连 , 多线程不安全 , 如果要避免,需要使用jedis pool
lettuce:采用netty , 实力可以在多个线程中共享 , 减少线程数据 , 性能更高
spring.redis.host=192.168.31.193 spring.redis.port=6379
测试
使用springboot存对象相关序列化问题
1 . 构建自己的实体类
对象必须序列化,不序列化报错
package com.cxy.redis.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import java.io.Serializable; @Data @AllArgsConstructor @NoArgsConstructor public class User implements Serializable { private String name; private Integer age; }
2 . 编写测试类
package com.cxy.redis; import com.cxy.redis.pojo.User; import com.fasterxml.jackson.core.JsonProcessingException; 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 class RedisApplicationTests { @Autowired private RedisTemplate redisTemplate; @Test public void test() throws JsonProcessingException { User user = new User("user", 3); redisTemplate.opsForValue().set("user",user); System.out.println(redisTemplate.opsForValue().get("user")); } }
序列化问题
直接向value中存对象 , 会发生问题
对象的key被保存成了乱码的样子
原因是redisTemplate , 默认使用的JDK序列化方式
解决
key的序列化使用String序列化
stringRedisSerializer
, value使用jackson2JsonRedisSerializer
序列化编写自己的配置类
package com.cxy.redis.config; import com.fasterxml.jackson.annotation.JsonAutoDetect; import com.fasterxml.jackson.annotation.JsonTypeInfo; import com.fasterxml.jackson.annotation.PropertyAccessor; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator; 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.Jackson2JsonRedisSerializer; import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer; import org.springframework.data.redis.serializer.StringRedisSerializer; import java.net.UnknownHostException; @Configuration public class RedisConfig { //自己的redisTemplate @Bean @SuppressWarnings("all") public RedisTemplate<String, Object> redisTemplates(RedisConnectionFactory factory) { RedisTemplate<String,Object> template = new RedisTemplate<>(); template.setConnectionFactory(factory); //序列化配置 Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class); ObjectMapper om = new ObjectMapper(); om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); om.activateDefaultTyping(LaissezFaireSubTypeValidator.instance,ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.WRAPPER_ARRAY); jackson2JsonRedisSerializer.setObjectMapper(om); //string的序列化 StringRedisSerializer stringRedisSerializer = new StringRedisSerializer(); //key采用string的序列化方式 template.setKeySerializer(stringRedisSerializer); //hash的key采用string的序列化方式 template.setHashKeySerializer(stringRedisSerializer); //value采用string的序列化方式 template.setValueSerializer(jackson2JsonRedisSerializer); //hash的value采用string的序列化方式 template.setHashValueSerializer(jackson2JsonRedisSerializer); template.afterPropertiesSet(); return template; } }
使用注解导入自己的配置
@Qualifier("redisTemplates") private RedisTemplate redisTemplate;
启动测试
乱码解决
一般会编写RedisUtil去调用redis