SpringCloud集成Spring Data Redis

我不是女神ヾ 2022-03-10 11:06 279阅读 0赞

### 文章目录 ###

*  Spring Data Redis
 *  源码
 *   *  springcloud-parent2父Maven模块
     *  spring-redis子Maven模块
 *  结果
 *  分析

# Spring Data Redis #

如同使用SpringData进行关系型数据库访问一样，使用Spring Data Redis的第一步就是连接到Redis服务器。要想实现连接，就需要获取RedisConnection，而获取RedisConnection的手段是使用RedisConnectionFactory接口。Spring Data Redis对Redis操作做了封装，提供了一个工具类RedisTemplate，通过注入RedisConnectionFactory到RedisTemplate中，该RedisTemplate就能获取RedisConnection。

RedisTemplate提供了丰富的接口来操作Redis的特定数据类型，这些接口包括ValueOperations、ListOperations、SetOperations、ZSetOperations和HashOperations等，分别对应Redis中的String、List、Set、ZSet和Hash 5种常见的数据结构。

SpringCloud在集成Spring Data Redis时，需要引入`spring-boot-starter-data-redis`依赖。

# 源码 #

## springcloud-parent2父Maven模块 ##

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <packaging>pom</packaging>
      <modules>
        <module>spring-data</module>
        <module>spring-redis</module>
      </modules>
    
      <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.4.RELEASE</version>
      </parent>
    
      <groupId>com.lyc</groupId>
      <artifactId>springcloud-parent2</artifactId>
      <version>1.0-SNAPSHOT</version>
    
      <name>springcloud-parent2</name>
    
      
      <dependencyManagement>
        <dependencies>
          <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Dalston.SR3</version>
            <type>pom</type>
            <scope>import</scope>
          </dependency>
        </dependencies>
      </dependencyManagement>
    
      <dependencies>
        <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <version>1.18.4</version>
        </dependency>
      </dependencies>
    
    </project>

## spring-redis子Maven模块 ##

pom.xml

SpringRedisApplication启动类

package com.lyc.pringRedis;
    
    import com.fasterxml.jackson.annotation.JsonAutoDetect;
    import com.fasterxml.jackson.annotation.PropertyAccessor;
    import com.fasterxml.jackson.databind.ObjectMapper;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.annotation.Bean;
    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;
    
    /** * @author: zhangzhenyi * @date: 2019/3/10 14:34 * @description: SpringRedis启动类 **/
    @SpringBootApplication
    public class SpringRedisApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(SpringRedisApplication.class,args);
        }
    
        @Bean
        public RedisTemplate<Object,Object> redisTemplate(RedisConnectionFactory redisConnectionFactory){ 
    
            RedisTemplate<Object,Object> template = new RedisTemplate<>();
            template.setConnectionFactory(redisConnectionFactory);
            @SuppressWarnings("unchecked")
            Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
            ObjectMapper om = new ObjectMapper();
            om.setVisibility(PropertyAccessor.ALL,JsonAutoDetect.Visibility.ANY);
            om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
            jackson2JsonRedisSerializer.setObjectMapper(om);
    
            template.setValueSerializer(jackson2JsonRedisSerializer);
            template.setKeySerializer(new StringRedisSerializer());
            return template;
        }
    }

PersonRedisController类

package com.lyc.pringRedis.controller;
    
    import com.lyc.pringRedis.entity.Person;
    import com.lyc.pringRedis.server.PersonRedisRepository;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /** * @author: zhangzhenyi * @date: 2019/3/10 14:41 * @description: PersonRedis Controller **/
    @RestController
    public class PersonRedisController { 
    
        @SuppressWarnings("SpringJavaAutowiredFieldsWarningInspection")
        @Autowired
        PersonRedisRepository personRedisRepository;
    
        /** * 在Redis中存值 */
        @RequestMapping("/setPerson")
        public void setPerson(){ 
            Person person = Person.builder()
                    .id(1L)
                    .name("zhangsan")
                    .age(32)
                    .address("shanghai")
                    .build();
            personRedisRepository.save(person);
        }
    
        /** * 读取存入Redis中的值 * @return */
        @RequestMapping("/getPerson")
        public Person getPerson(){ 
            return personRedisRepository.getPerson();
        }
    
    }

PersonRedisRepository类

package com.lyc.pringRedis.server;
    
    import com.lyc.pringRedis.entity.Person;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.redis.core.RedisTemplate;
    import org.springframework.data.redis.core.ValueOperations;
    import org.springframework.stereotype.Repository;
    
    import javax.annotation.Resource;
    
    /** * @author: zhangzhenyi * @date: 2019/3/10 14:29 * @description: PersonRedis Repository **/
    @Repository
    public class PersonRedisRepository { 
    
        @Autowired
        RedisTemplate<Object,Object> redisTemplate;
    
        @SuppressWarnings({ "SpringJavaInjectionPointsAutowiringInspection", "WeakerAccess"})
        @Resource(name = "redisTemplate")
        ValueOperations<Object,Object> valueOperations;
    
        public void save(Person person){ 
            valueOperations.set(person.getId().toString(),person);
        }
    
        public Person getPerson(){ 
            return (Person) valueOperations.get("1");
        }
    
    }

Person类

package com.lyc.pringRedis.entity;
    
    import lombok.*;
    
    /** * @author: zhangzhenyi * @date: 2019/3/10 11:02 * @description: Person实体类 **/
    @Getter
    @Setter
    @Builder
    @NoArgsConstructor
    @AllArgsConstructor
    public class Person { 
    
        private Long id;       //主键id
        private String name;    //姓名
        private Integer age;    //年龄
        private String address;    //地址
    
    }

# 结果 #

先访问：

http://localhost:8080/setPerson

再访问：

http://localhost:8080/getPerson

得到的结果如下：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1paWTEwNzg2ODkyNzY_size_16_color_FFFFFF_t_70]

该结果在Redis客户端中的访问结果如下：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1paWTEwNzg2ODkyNzY_size_16_color_FFFFFF_t_70 1]

# 分析 #

在Spring Data Redis中的Repository类需要注入Redis Template，并提供ValueOperations进行具体的操作，如在PersonRedisRepository类中的情况就是如此。

这里的ValueOperation依赖于RedisTemplate，而在RedisTemplate中可以对RedisConnectionFactory和序列化方式进行设置。在Spring Boot中，用于构建RedisTemplate的代码一般会放到Bootstrap类中，如上面的SpringRedisApplication就是如此。

在这里，由于我们在使用Redis时是采用的默认配置，所以说此处就没必要配置`application.yml`文件了。而在默认的配置信息中，Redis服务器是以6378为端口号进行启动。

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1paWTEwNzg2ODkyNzY_size_16_color_FFFFFF_t_70 1]: /images/20220310/fcdafba8f0394d91af52ba522159584e.png