上传大图片时速度很慢，所以对图片进行压缩之后再进行存储
Thumbnailator官网：http://code.google.com/p/thumbnailator/
pom中添加
<dependency> <groupId>net.coobird</groupId> <artifactId>thumbnailator</artifactId> <version>0.4.8</version> </dependency> controller @PostMapping("/upload") public Object upload(@RequestParam("file") MultipartFile file) throws IOException {// if(file.getSize() > 2 * ONE_MB){// return ResponseUtil.fail(500,"图片大小超出2M！");// } String originalFilename = file.getOriginalFilename(); logger.info("压缩前："+file.getSize()); ByteArrayInputStream inputStream = uploadFile(file); logger.info("压缩后："+inputStream.available()); LitemallStorage litemallStorage = storageService.store(inputStream, inputStream.available(), file.getContentType(), originalFilename); return ResponseUtil.ok(litemallStorage); } /** * 压缩图片 * @return */ public static ByteArrayInputStream uploadFile(MultipartFile file){ if(file == null)return null; ByteArrayOutputStream baos = null; try { baos = new ByteArrayOutputStream(); Thumbnails.of(file.getInputStream()).scale(0.4f).outputQuality(0.25f).toOutputStream(baos); if(baos!=null) return parse(baos); } catch (Exception e) { e.printStackTrace(); } return null; } // outputStream转inputStream public static ByteArrayInputStream parse(OutputStream out) throws Exception { ByteArrayOutputStream baos = new ByteArrayOutputStream(); baos = (ByteArrayOutputStream) out; ByteArrayInputStream swapStream = new ByteArrayInputStream(baos.toByteArray()); return swapStream; } service: /** * 存储一个文件对象 * * @param inputStream 文件输入流 * @param contentLength 文件长度 * @param contentType 文件类型 * @param fileName 文件索引名 */ public LitemallStorage store(InputStream inputStream, long contentLength, String contentType, String fileName) { String key = generateKey(fileName); store(inputStream, contentLength, contentType, key); String url = generateUrl(key); LitemallStorage storageInfo = new LitemallStorage(); storageInfo.setName(fileName); storageInfo.setSize((int) contentLength); storageInfo.setType(contentType); storageInfo.setKey(key); storageInfo.setUrl(url); litemallStorageService.add(storageInfo); return storageInfo; } @Override public void store(InputStream inputStream, long contentLength, String contentType, String keyName) { try { // 简单文件上传, 最大支持 5 GB, 适用于小文件上传, 建议 20M以下的文件使用该接口 ObjectMetadata objectMetadata = new ObjectMetadata(); objectMetadata.setContentLength(contentLength); objectMetadata.setContentType(contentType); // 对象键（Key）是对象在存储桶中的唯一标识。 PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, keyName, inputStream, objectMetadata); PutObjectResult putObjectResult = getOSSClient().putObject(putObjectRequest); } catch (Exception ex) { logger.error(ex.getMessage(), ex); } } Thumbnailator的其他方法： //按指定大小把图片进行缩和放（会遵循原图bzddp比例）//此处把图片压成400×500的缩略图Thumbnails.of(fromPic).size(400,500).toFile(toPic);按照指定比例进行缩小和放大 //按照比例进行缩小和放大Thumbnails.of(fromPic).scale(0.2f).toFile(toPic);//按比例缩小Thumbnails.of(fromPic).scale(2f);//按比例放大 图片尺寸不变，压缩图片文件大小//图片尺寸不变，压缩图片文件大小outputQuality实现,参数1为最高质量Thumbnails.of(fromPic).scale(1f).outputQuality(0.25f).toFile(toPic);