进阶SpringBoot之集合 Redis

（在跑 Redis 测试之前，需要先安装 Redis，并开启 Redis 服务）

Spring Boot 项目添加依赖

NoSQL -> Spring Data Redis

pom.xml 文件如下

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

Spring boot 所有的配置类，都有一个自动配置类

自动配置类都会绑定一个 properties 配置文件

application.properties：

#配置redis
spring.data.redis.host=127.0.0.1
spring.data.redis.port=6397

测试类：

package com.demo.redis;

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
    void contextLoads() {
        redisTemplate.opsForValue().set("mykey","张三");
        System.out.println(redisTemplate.opsForValue().get("mykey"));
    }

}

pojo 包下创建实体类

implements Serializable 所有 pojo 的对象都会序列化

package com.demo.redis.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.stereotype.Component;

import java.io.Serializable;

@Component
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User implements Serializable {  //所有pojo的对象都会序列化
    private String name;
    private int age;
}

测试类：

package com.demo.redis;

import com.demo.redis.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;

@SpringBootTest
class RedisApplicationTests {

    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    void contextLoads() {
        redisTemplate.opsForValue().set("mykey","张三");
        System.out.println(redisTemplate.opsForValue().get("mykey"));
    }

    @Test
    public void test() throws JsonProcessingException {
        User user = new User("张三", 18);
        //String jsonUser = new ObjectMapper().writeValueAsString(user);
        //redisTemplate.opsForValue().set("user",jsonUser);
        redisTemplate.opsForValue().set("user",user);
        System.out.println(redisTemplate.opsForValue().get("user"));
    }

}

config 包下配置类：

可以自定义 RedisTemplate

package com.demo.redis.config;

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 {
    //自定义一个RedisTemplate
    @Bean
    public RedisTemplate<String,Object> redisTemplate(RedisConnectionFactory factory){
        RedisTemplate<String,Object> template = new RedisTemplate<>();
        template.setConnectionFactory(factory);

        //Json序列化配置
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

        //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序列化方法采用jackson
        template.setValueSerializer(jackson2JsonRedisSerializer);

        //hash的value序列化方法采用jackson
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        
        return template;
    }
}

测试类在属性上方添加 @Qualifier("redisTemplate") 指定 config 包下的配置类