微信公众号素材下载之java

<dependency>
   <groupId>com.github.binarywang</groupId>
   <artifactId>wx-java-mp-spring-boot-starter</artifactId>
    <version>4.0.0</version>
</dependency>

关键代码  
import me.chanjar.weixin.mp.api.WxMpService;
@Autowired
 private  WxMpService wxMpService;
 //mediaID是前台传给你的 -seOcBlnScPObUDYqqvS6bjkXMYMX3oViECw1PE0u6pZ-2ahcKjHA2zeYNS1pv2G
File file = wxMpService.getMaterialService().mediaDownload(mediaId);