spring mvc 上传文件获取不到filename,该如何处理

spring mvc 上传文件获取不到filename

上图为ext form 下图为Controller定义的file
------解决方案--------------------
参考下这个

模型
FileUpload.java

package com.mkyong.common.model;
import org.springframework.web.multipart.MultipartFile;
 
public class FileUpload{
 
	MultipartFile file;
	//getter and setter methods
 
}

控制器
FileUploadController.java

package com.mkyong.common.controller;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.validation.BindException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
 
import com.mkyong.common.model.FileUpload;
 
public class FileUploadController extends SimpleFormController{
 
	public FileUploadController(){
		setCommandClass(FileUpload.class);
		setCommandName("fileUploadForm");
	}
 
	@Override
	protected ModelAndView onSubmit(HttpServletRequest request,
		HttpServletResponse response, Object command, BindException errors)
		throws Exception {
 
		FileUpload file = (FileUpload)command;
 
		MultipartFile multipartFile = file.getFile();
 
		String fileName="";
 
		if(multipartFile!=null){
			fileName = multipartFile.getOriginalFilename();
			//do whatever you want
		}
 
		return new ModelAndView("FileUploadSuccess","fileName",fileName);
	}
}

校验器
FileUploadValidator.java

package com.mkyong.common.validator;
 
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import com.mkyong.common.model.FileUpload;
 
public class FileUploadValidator implements Validator{
 
	@Override
	public boolean supports(Class clazz) {
		//just validate the FileUpload instances
		return FileUpload.class.isAssignableFrom(clazz);
	}
 
	@Override
	public void validate(Object target, Errors errors) {
 
		FileUpload file = (FileUpload)target;
 
		if(file.getFile().getSize()==0){
			errors.rejectValue("file", "required.fileUpload");
		}
	}
}