import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.OutputStream;  

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileItemFactory;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.springframework.web.multipart.MultipartFile;

import org.springframework.web.multipart.commons.CommonsMultipartFile; 

/*

    创建FileItem

     */

	private FileItem createFileItem(File file, String fieldName) {

		FileItemFactory factory = new DiskFileItemFactory(16, null);

		FileItem item = factory.createItem(fieldName, "text/plain", true, file.getName());

		int bytesRead = 0;

		byte[] buffer = new byte[8192];

		try {

			FileInputStream fis = new FileInputStream(file);

			OutputStream os = item.getOutputStream();

			while ((bytesRead = fis.read(buffer, 0, 8192)) != -1) {

				os.write(buffer, 0, bytesRead);

			}

			os.close();

			fis.close();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return item;

	}

MultipartFile mfile = new CommonsMultipartFile(fileItem);