MultipartFile上传图片并压缩
背景
之前写过一个图片上传，使用了spring的MultipartFile实现的，比较简单，限制了1M的大小，后来产品需求上传图片需压缩，遂着手开始实现
压缩工具
之前用过google的图片压缩工具thumbnailator，简单好用，决定这次也使用这个，具体使用可自行百度
github地址（/coobird/thumbnailator）, pom引用
<!--thumbnailator 压缩工具--><dependency><groupId>net.coobird</groupId><artifactId>thumbnailator</artifactId><version>0.4.8</version></dependency>
代码
talk is cheap，show me the code，话不多说，直接贴代码
@PostMapping("/uploadrespic")@ApiOperation(value = "上传文件")@ApiImplicitParams({@ApiImplicitParam(name = "platform", paramType = "query", dataType = "string", required = true),@ApiImplicitParam(name = "module", paramType = "query", dataType = "string", required = true),@ApiImplicitParam(name = "type", paramType = "query", dataType = "string", required = true)})public ResponseEnvelope imgUpload(@RequestPart("file") MultipartFile file,@RequestParam String platform,@RequestParam String module,@RequestParam String type) {LoginUser loginUser = LoginContext.getLoginUser(LoginUser.class);if (loginUser == null) {return new ResponseEnvelope(false, "请先登录");}//上传图片压缩start//记录原MultipartFile，如果压缩异常就用原来的MultipartFileMultipartFile oldMultipartFile = file;try {String fileName = file.getName();String originalFilename = file.getOriginalFilename();String contentType = file.getContentType();LocalDateTime now = LocalDateTime.now();//这里就是生成一个绝对路径，使用了公司的工具类FilePathUtil，几个参数都没什么重要含义，里面引用太多，就不贴出来了，大家测试随便给个路径出来能构建file对象就好了String absolutePath = FilePathUtil.absolutePath(storagePath, platform, "temp", type, now, file.getOriginalFilename());File tempFile = new File(absolutePath);Thumbnails.of(file.getInputStream()).scale(1f).outputQuality(0.99f).toFile(tempFile);FileInputStream fileInputStream = new FileInputStream(tempFile);file = new MockMultipartFile(fileName, originalFilename, contentType, fileInputStream);fileInputStream.close();boolean success = tempFile.delete();log.info(CLASS_LOG_PREFIX + "删除临时file success：{}", success);} catch (IOException e) {log.error(CLASS_LOG_PREFIX + "压缩图片失败,把MultipartFile赋值为原来的值oldFile,exception：{}", e);file = oldMultipartFile;}//上传图片压缩endLocalDateTime now = LocalDateTime.now();String absolutePath = FilePathUtil.absolutePath(storagePath, platform, module, type, now, file.getOriginalFilename());Uploader uploader = UploaderFactory.createUploader(type, file, absolutePath);if (file.getSize() > DEFAULT_LIMIT) {return new ResponseEnvelope(false, "请上传小于1M的图片");}String baseName = getBaseName(absolutePath) + FilePathUtil.getExtension(absolutePath).toUpperCase();Pattern compile = pile(DEFAULT_RESFORMAT);Matcher matcher = compile.matcher(baseName);if (!matcher.find()) {return new ResponseEnvelope(false, "允许上传的图片格式为BMP\\JPG\\JPEG\\GIF\\PNG(格式不区分大小写)");}uploader.upload();FileVO fileVO = uploader.getFileVO();String returnPath = "/" + FilePathUtil.relativePath(storagePath, absolutePath);fileVO.setUrl(returnPath);//保存到数据库 并设置返回idLong picId = supplyDemandPicService.saveResPic(fileVO, type, absolutePath, loginUser, storagePath);fileVO.setResId(picId);if (picId == null || picId == 0) {return new ResponseEnvelope(false, "Failed to upload picture");}return new ResponseEnvelope(true, "Success to upload picture", fileVO);}
逻辑就在上传图片start和end中间的部分，没什么说的，就是把MultipartFile的输入流压缩到一个临时的file里，然后再根据临时file和之前的参数生成一个新的MultipartFile，完美的在之前的逻辑中嵌入了图片压缩，亲测有效，记录一下
后记
路还很长，不懂得还很多，坚持每天进步！！！
