java环境下集成redis

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