Redis入门到实战教程（基础篇）笔记

news2024/11/24 15:38:45

教学来源：

Redis课程介绍导学_哔哩哔哩_bilibilihttps://www.bilibili.com/video/BV1cr4y1671t?p=1一、Redis 入门

1.认识NoSQL

2.Redis在虚拟机中的安装和开机自启

Redis在虚拟机中安装和配置开机自启-CSDN博客https://blog.csdn.net/qq_69183322/article/details/138168301

3.Redis的数据结构

4.Redis的基本类型

（1）字符串String类型

（2）哈希Hash类型

（3）列表List类型

（4）集合Set类型

（5）有序集合类型

二、Redis的Java客户端Jedis

（1）Jedis简单示例

引入依赖：

        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>3.7.0</version>
        </dependency>

代码示例：

package com.example.redisdemo;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import redis.clients.jedis.Jedis;

import java.util.Map;

@SpringBootTest
class RedisDemoApplicationTests {

    private Jedis jedis;

   @BeforeEach
    void setUp(){
       jedis = new Jedis("localhost",6379);
//密码
//       jedis.auth("123");
       jedis.select(0);
   }

   @Test
    void testString(){
       String result  = jedis.set("name","张四");
       System.out.println("result="+result);

       String name = jedis.get("name");
       System.out.println("name="+name);
   }

   @Test
   void testHash(){
       jedis.hset("user:1","name","Jack");
       jedis.hset("user:1","age","21");

       Map<String,String> map = jedis.hgetAll("user:1");

       System.out.println(map);
   }

   @AfterEach
    void tearDown(){
       if(jedis !=null){
           jedis.close();
       }
   }

}

（2）Jedis连接池

在utils中写Jedis连接池的配置:

package com.example.redisdemo.utils;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class JedisConnectionFactory {

    private static  final JedisPool jedisPool;

    static {
        JedisPoolConfig poolConfig = new JedisPoolConfig();
        poolConfig.setMaxTotal(8);
        poolConfig.setMaxIdle(8);
        poolConfig.setMaxIdle(0);
        poolConfig.setMaxWaitMillis(1000);

        jedisPool = new JedisPool(poolConfig,"192.168.92.136",6379,1000,"123456");
    }

    public static Jedis getJedis(){
        return jedisPool.getResource();
    }
}

在test中进行测试：

package com.example.redisdemo;

import com.example.redisdemo.utils.JedisConnectionFactory;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import redis.clients.jedis.Jedis;

import java.util.Map;

@SpringBootTest
class RedisDemoApplicationTests {

    private Jedis jedis;

   @BeforeEach
    void setUp(){
//       jedis = new Jedis("192.168.92.136",6379);
       jedis = JedisConnectionFactory.getJedis();
       jedis.auth("123456");
       jedis.select(0);
   }

   @Test
    void testString(){
       String result  = jedis.set("name","张四");
       System.out.println("result="+result);

       String name = jedis.get("name");
       System.out.println("name="+name);
   }

   @Test
   void testHash(){
       jedis.hset("user:1","name","Jack");
       jedis.hset("user:1","age","21");

       Map<String,String> map = jedis.hgetAll("user:1");

       System.out.println(map);
   }

   @AfterEach
    void tearDown(){
       if(jedis !=null){
           jedis.close();
       }
   }

}

三、SpringDataRedis

（1）快速入门实例：

1.引入依赖

        <!--        Redis依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
<!--        连接池依赖-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>

2.在application.yml中进行配置

server:
  port: 8080

spring:
  redis:
    host: 192.168.92.136
    port: 6379
    password: 123456
    lettuce:
      pool:
        max-active: 8 #最大连接
        max-idle: 8 #最大空闲连接
        min-idle: 0 #最小空闲连接
        max-wait: 100 #连接等待时间

3.Test中编写示例

package com.example.redisdemo;

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 RedisDemoApplicationTests {

    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    void testString(){
        redisTemplate.opsForValue().set("name","小龙");
        Object name = redisTemplate.opsForValue().get("name");
        System.out.println("name="+name);
    }

}

（2）RedisTemplate序列化

配置序列化 config.RedisConfig

package com.example.redisdemo.config;

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.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;

@Configuration
public class RedisConfig {

   @Bean
    public  RedisTemplate<String,Object> redisTemplate(RedisConnectionFactory connectionFactory){

       RedisTemplate<String,Object> template = new RedisTemplate<>();
       //设置连接工厂
       template.setConnectionFactory(connectionFactory);
       //创建Json序列化工具
       GenericJackson2JsonRedisSerializer jsonRedisSerializer =new GenericJackson2JsonRedisSerializer();
       //设置Key的序列化
       template.setKeySerializer(RedisSerializer.string());
       template.setHashKeySerializer(RedisSerializer.string());
       //设置Value的序列化
       template.setValueSerializer(jsonRedisSerializer);
       template.setHashValueSerializer(jsonRedisSerializer);

       return template;
   }

}

创建实体 pojo.User

package com.example.redisdemo.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private String name;
    private Integer age;
}

在Test中编写测试用例

package com.example.redisdemo;

import com.example.redisdemo.pojo.User;
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 RedisDemoApplicationTests {

    @Autowired
    private RedisTemplate<String,Object> redisTemplate;

    @Test
    void testString(){
        redisTemplate.opsForValue().set("name","小龙");
        Object name = redisTemplate.opsForValue().get("name");
        System.out.println("name="+name);
    }

    @Test
    void testSaveUser(){
        redisTemplate.opsForValue().set("user:100",new User("小虎",21));
        User user = (User) redisTemplate.opsForValue().get("user:100");
        System.out.println("user="+user);
    }


}

报错可能没有引入Jackson依赖

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>

（3）序列化的另一种方式StringRedisTemplate

示例代码：

package com.example.redisdemo;

import com.example.redisdemo.pojo.User;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
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;
import org.springframework.data.redis.core.StringRedisTemplate;

import java.util.Map;

@SpringBootTest
class RedisDemoApplicationTests {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    //Json工具
    private static final ObjectMapper mapper = new ObjectMapper();

    @Test
    void testStringTemplate() throws JsonProcessingException{
        User user = new User("小明",20);
        //手动序列化
        String json = mapper.writeValueAsString(user);

        stringRedisTemplate.opsForValue().set("user:200",json);

        String val = stringRedisTemplate.opsForValue().get("user:200");
        //反序列化
        User user1 = mapper.readValue(val, User.class);
        System.out.println("user1:"+user1);
    }

    @Test
    void testHash(){
        stringRedisTemplate.opsForHash().put("user:400","name","小胡");
        stringRedisTemplate.opsForHash().put("user:400","age","21");
        
        Map<Object,Object> entries = stringRedisTemplate.opsForHash().entries("user:400");
        System.out.println("entries:"+entries);
    }

}

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