java 图片读写

BufferedImage image = ImageIO.read(new File("d:\\1.jpg"));

ImageIO.write(image, "png", new File("d:\\2.jpg"));

spring mvc 处理用户端上传图片到服务器问题：

<form id="uploadForm" action="${ctx}/guigg/advertise/upLoadImg" method="post" enctype="multipart/form-data">
<input type="file" id="uploadFile1" name="uploadFile1" class="file-button" accept=".jpg,.gif,.bmp,.png,.jpeg"/>
<br/><input type="submit" value="确认提交">
</form>

public void upLoadImg(@RequestParam("uploadFile1") MultipartFile myfile,
HttpServletRequest request, HttpServletResponse response) throws Exception{
if(!myfile.isEmpty()){
//        byte[] bs= myfile.getBytes() ;
//        InputStream sbs = new ByteArrayInputStream(bs);

                String fileName = myfile.getOriginalFilename();
<pre name="code" class="java">                InputStream sbs = myfile.getInputStream();
File file= new File("D:\\2.jpg");
BufferedImage bi1 =ImageIO.read(sbs);
ImageIO.write(bi1, "jpg", file);
}
}