spring boot 学习笔记系列-redis简单使用

1、在Maven pom.xml文件中加入Redis包

<!--redis-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-redis</artifactId>
    <version>${boot.version}</version>
</dependency>

2、SpringBoot配置文件中配置Redis连接（YAML方式配置）默认是localhost:6379

#mybatis配置
mybatis:
  mapper-locations: classpath:mapper/*Mapper.xml
  type-aliases-package: com.carry.domain
数据源
spring:
  redis:
    host: 127.0.0.1
    port: 6379

3、RedisTemplate 配置(RedisTemplate 实例化默认配置或需要按需配置后使用，StringRedisTemplate 则可以直接使用——继承自RedisTemplate)

package com.example.redis.demo;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
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.StringRedisSerializer;

@Configuration
public class RedisConfig {
 
   @Bean
   public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
      RedisTemplate<Object, Object> template = new RedisTemplate<>();
      template.setConnectionFactory(connectionFactory);
 
      //使用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值
      Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class);
 
      ObjectMapper mapper = new ObjectMapper();
      mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
      mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
      serializer.setObjectMapper(mapper);
 
      template.setValueSerializer(serializer);
      //使用StringRedisSerializer来序列化和反序列化redis的key值
      template.setKeySerializer(new StringRedisSerializer());
      template.afterPropertiesSet();
      return template;
   }
}

4、RedisTemplate的简单使用

package com.example.redis.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;

@Service
public class RedisSave {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Autowired
    private RedisTemplate redisTemplate;
    @PostConstruct
    public void find() {

        redisTemplate.opsForValue().set("users3", "1");
    }
}

opsForValue的作用是返回redis的操作命令,这里附上官方api解释:

opsForValue()
Returns the operations performed on simple values (or Strings in Redis terminology).

stringRedisTemplate 直接使用可以 查到 （users2）,而

RedisTemplate直接使用则不可以(users3)，需要配置后使用(配置后才可以)。