java获取图片分辩率大小

一、String oriname = file.getOriginalFilename();
String atp = oriname.substring(oriname.lastIndexOf(".")+1, oriname.length());
Iterator  readers = ImageIO.getImageReadersByFormatName(atp);
if(readers.hasNext()){
ImageReader reader = readers.next();
ImageInputStream stream = new MemoryCacheImageInputStream(file.getInputStream());
   reader.setInput(stream);
   int width = reader.getWidth(reader.getMinIndex());
   int height = reader.getHeight(reader.getMinIndex());
   if(width != StaticParam.wego_pic_width || height != StaticParam.wego_pic_height){
    return "{\"success\":\"pix\"}";
   }
}

二、

BufferedImage sourceImg = null;
   sourceImg = javax.imageio.ImageIO.read(is);
   System.out.println("width:" + sourceImg.getWidth());
   System.out.println("height:" + sourceImg.getHeight());