What is the method for caching images in Spring Boot?

2 years ago
Isabella Edwards
2 minutes

There are multiple methods for caching images in Spring Boot, here are some common ones:

  1. Utilize Http caching by setting the Cache-Control and Expires headers in the response to cache images. You can customize WebMvc configuration using Spring Boot’s WebMvcConfigurer and add an interceptor to set the response headers.
@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new CacheInterceptor());
    }
}

public class CacheInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 设置Cache-Control和Expires头信息
        response.setHeader("Cache-Control", "max-age=3600");
        response.setHeader("Expires", "Sun, 01 Jan 2023 00:00:00 GMT");
        return true;
    }
}
  1. Utilizing the Ehcache caching framework: Ehcache is an open-source Java caching framework that can be used to cache image data. Start by adding the Ehcache dependency in the pom.xml, then configure Ehcache in the Spring Boot configuration file.
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-cache</artifactId>
</dependency>

<dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache</artifactId>
</dependency>

spring:
  cache:
    type: ehcache

Then add the @Cacheable annotation to the method that requires caching images, specifying the cache name and cache key.

@Cacheable(cacheNames = "imageCache", key = "#url")
public byte[] getImage(String url) {
    // 从网络或其他地方获取图片数据
    return imageData;
}
  1. Utilize the Redis caching framework: Redis is a high-performance in-memory database that can be used to cache image data. Begin by adding the Redis dependency for Spring Boot in the pom.xml file, then configure Redis in the Spring Boot configuration file.
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

spring:
  redis:
    host: localhost
    port: 6379

Then, in the method where image caching is needed, add the @Cacheable annotation, and specify the cache name and cache key.

@Cacheable(cacheNames = "imageCache", key = "#url")
public byte[] getImage(String url) {
    // 从网络或其他地方获取图片数据
    return imageData;
}

In large-scale applications, utilizing Http caching or using Ehcache/Redis caching methods are more suitable options to maximize the speed of accessing images by fully utilizing the cache.

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