springboot如何在redis里存入HashMap又取出HashMap

在Spring Boot中使用Redis存储HashMap可以通过使用RedisTemplate来实现。以下是一个示例：

首先，在pom.xml文件中添加Redis依赖：

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

在application.properties中配置Redis连接信息：

spring.redis.host=localhost
spring.redis.port=6379

创建一个Redis配置类，用于配置RedisTemplate：

@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(redisConnectionFactory);

        // 使用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值
        Jackson2JsonRedisSerializer<Object> jacksonSerializer = new Jackson2JsonRedisSerializer<>(Object.class);

        // 设置value的序列化器
        template.setValueSerializer(jacksonSerializer);
        template.setDefaultSerializer(jacksonSerializer);

        template.afterPropertiesSet();
        return template;
    }
}

创建一个Service类，用于操作Redis：

@Service
public class RedisService {

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    public void saveHashMap(String key, HashMap<String, Object> hashMap) {
        redisTemplate.opsForHash().putAll(key, hashMap);
    }

    public HashMap<String, Object> getHashMap(String key) {
        return (HashMap<String, Object>) redisTemplate.opsForHash().entries(key);
    }
}

在Controller中使用RedisService：

@RestController
public class MyController {

    @Autowired
    private RedisService redisService;

    @PostMapping("/saveHashMap")
    public void saveHashMap() {
        HashMap<String, Object> hashMap = new HashMap<>();
        hashMap.put("key1", "value1");
        hashMap.put("key2", "value2");
        redisService.saveHashMap("myHashMap", hashMap);
    }

    @GetMapping("/getHashMap")
    public HashMap<String, Object> getHashMap() {
        return redisService.getHashMap("myHashMap");
    }
}

这样，当调用/saveHashMap接口时，会将HashMap存储到Redis中；而调用/getHashMap接口时，会从Redis中取出HashMap