您可以将tranisent base64imageFile属性添加到中User。它将保存图像的base64编码的字符串，您可以像在jsp中那样访问
<img alt="img" src="data:image/jpeg;base64,${user.base64imageFile}"/>
在您的方法中，您应该进行编码，例如
@RequestMapping(value = "/register", method = RequestMethod.POST)
public ModelAndView userRegister(@modelattribute("user") @Valid User user, BindingResult result, ModelMap model, @RequestParam("fileData") multipartfile fileData) throws Exception {
if (!fileData.isEmpty() && fileData != null) {
byte[] bytes = fileData.getBytes();
user.setFileName(fileData.getOriginalFilename());
user.setImageFile(bytes);
byte[] encodeBase64 = Base64.encodeBase64(bytes);
String base64Encoded = new String(encodeBase64, "UTF-8");
user.setBase64image(base64encoded);
}
}
IoUtils并且Base64是来自的方便的util类org.apache.commons，查找应该没有问题
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