1.pom.xml引入依赖

<dependency><groupId>net.coobird</groupId><artifactId>thumbnailator</artifactId><version>0.4.8</version></dependency>

2.接口

/*** 上传人员头像* @param multipartFile* @return*/@Log(title = "人员头像", businessType = BusinessType.UPDATE)@PostMapping("/avatar")@SneakyThrowspublic AjaxResult avatar(@RequestParam("multipartFile") MultipartFile multipartFile){if (!multipartFile.isEmpty()){String fileName = FileUploadUtils.extractFilename(multipartFile);byte[] bytes = multipartFile.getBytes();bytes = ThumbnailUtis.compressPictureForScale(bytes,92,128);//将字节数组写入到文件String filePath= RuoYiConfig.getAvatarPath()+"/"+fileName;FileUtils.writeByteArrayToFile(new File(filePath),bytes);//上传压缩后的图片//String avatar = FileUploadUtils.upload(RuoYiConfig.getAvatarPath(), file);String url=FileUploadUtils.getPathFileName(RuoYiConfig.getAvatarPath(),fileName);log.info("url={}",url);AjaxResult ajax = AjaxResult.success();ajax.put("url", url);return ajax;}return AjaxResult.error("上传头像异常，请联系管理员");}

3.工具类

/*** 文件压缩处理类** @author xiaoss* @since 1.0, 2022年05月26日 17:32:12*/
@Slf4j
public class ThumbnailUtis {/*** 根据指定尺寸压缩图片** @param imageBytes  源图片字节数组* @param width* @param hight* @return 压缩质量后的图片字节数组*/@SneakyThrowspublic static byte[] compressPictureForScale(byte[] imageBytes,int width,int hight) {if (imageBytes == null || imageBytes.length <= 0) {return imageBytes;}ByteArrayInputStream inputStream = new ByteArrayInputStream(imageBytes);ByteArrayOutputStream outputStream = new ByteArrayOutputStream(imageBytes.length);Thumbnails.of(inputStream).size(width,hight).keepAspectRatio(false).toOutputStream(outputStream);imageBytes = outputStream.toByteArray();return imageBytes;}}