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maven依赖

<!-- 压缩图片jar -->
<dependency>
   <groupId>net.coobird</groupId>
   <artifactId>thumbnailator</artifactId>
   <version>0.4.8</version>
</dependency>

详细代码

前端使用ajaxfileupload上传,Java框架springmvc,接受文件流使用

CommonsMultipartFile,

(

CommonsMultipartFile file

)

//控制图片的尺寸

BufferedImage image = Thumbnails.of(file.getInputStream()).size(1080,1920).asBufferedImage();
//BufferedImage 转 InputStream
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(image,"png",os);
ByteArrayInputStream byteArrayInputStream   = new ByteArrayInputStream(os.toByteArray());

result = oSSFileUtil.uploadFileStream(byteArrayInputStream, uploadPath);
详细参考http://blog.csdn.net/chenleixing/article/details/44685817;
供自己日后参考。