上一个小demo中，我们使用的是传入数组的方式，接下来我们可以使用单个入参的方式也是可以的
/*//多文件上传
@RequestMapping(value="/useraddsave.html",method=RequestMethod.POST)
public String addUserSave(User user,HttpSession session,HttpServletRequest request,
@RequestParam(value ="a_idPicPath", required = false) MultipartFile idPicFile,
@RequestParam(value ="a_workPicPath", required = false) MultipartFile workPicFile){
String idPicPath = null;
String workPicPath = null;
String path = request.getSession().getServletContext().getRealPath("statics"+File.separator+"uploadfiles");
logger.info("uploadFile path ============== > "+path);
//判断文件是否为空(证件照)
if(!idPicFile.isEmpty()){
String oldFileName = idPicFile.getOriginalFilename();//原文件名
logger.info("uploadFile oldFileName ============== > "+oldFileName);
String prefix=FilenameUtils.getExtension(oldFileName);//原文件后缀
logger.debug("uploadFile prefix============> " + prefix);
int filesize = 500000;
logger.debug("uploadFile size============> " + idPicFile.getSize());
if(idPicFile.getSize() > filesize){//上传大小不得超过 500k
request.setAttribute("uploadFileError", " * 上传大小不得超过 500k");
return "useradd";
}else if(prefix.equalsIgnoreCase("jpg") || prefix.equalsIgnoreCase("png")
|| prefix.equalsIgnoreCase("jpeg") || prefix.equalsIgnoreCase("pneg")){//上传图片格式不正确
String fileName = System.currentTimeMillis()+RandomUtils.nextInt(1000000)+"_Personal.jpg";
logger.debug("new fileName======== " + idPicFile.getName());
File targetFile = new File(path, fileName);
if(!targetFile.exists()){
targetFile.mkdirs();
}
//保存
try {
idPicFile.transferTo(targetFile);
} catch (Exception e) {
e.printStackTrace();
request.setAttribute("uploadFileError", " * 上传失败！");
return "useradd";
}
idPicPath = path+File.separator+fileName;
}else{
request.setAttribute("uploadFileError", " * 上传图片格式不正确");
return "useradd";
}
}
//判断文件是否为空(工作证照)
if(!workPicFile.isEmpty()){
String oldFileName = workPicFile.getOriginalFilename();//原文件名
logger.info("uploadFile oldFileName ============== > "+oldFileName);
String prefix=FilenameUtils.getExtension(oldFileName);//原文件后缀
logger.debug("uploadFile prefix============> " + prefix);
int filesize = 500000;
logger.debug("uploadFile size============> " + workPicFile.getSize());
if(workPicFile.getSize() > filesize){//上传大小不得超过 500k
request.setAttribute("uploadWpError", " * 上传大小不得超过 500k");
return "useradd";
}else if(prefix.equalsIgnoreCase("jpg") || prefix.equalsIgnoreCase("png")
|| prefix.equalsIgnoreCase("jpeg") || prefix.equalsIgnoreCase("pneg")){//上传图片格式不正确
String fileName = System.currentTimeMillis()+RandomUtils.nextInt(1000000)+"_Personal.jpg";
logger.debug("new fileName======== " + workPicFile.getName());
File targetFile = new File(path, fileName);
if(!targetFile.exists()){
targetFile.mkdirs();
}
//保存
try {
workPicFile.transferTo(targetFile);
} catch (Exception e) {
e.printStackTrace();
request.setAttribute("uploadWpError", " * 上传失败！");
return "useradd";
}
workPicPath = path+File.separator+fileName;
}else{
request.setAttribute("uploadWpError", " * 上传图片格式不正确");
return "useradd";
}
}
user.setCreatedBy(((User)session.getAttribute(Constants.USER_SESSION)).getId());
user.setCreationDate(new Date());
user.setIdPicPath(idPicPath);
user.setWorkPicPath(workPicPath);
if(userService.add(user)){
return "redirect:/user/userlist.html";
}
return "useradd";
}*/
原文：https://www.cnblogs.com/dongyaotou/p/12243147.html