java上传文件工具类

不废话直接上代码干货。

package com.yl.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Iterator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class ExcelUpload {
		public static String  excelUpload(HttpServletRequest req) throws Exception{
			String filename = null;
			DiskFileItemFactory factory = new DiskFileItemFactory();
			ServletFileUpload upload = new ServletFileUpload(factory);
			List items = null;
			try {
				items = upload.parseRequest(req);
			} catch (FileUploadException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			Iterator iter = items.iterator();
			while (iter.hasNext()) {
				FileItem item = (FileItem) iter.next();
				if (!item.isFormField()) {
					InputStream is = item.getInputStream();
					filename = System.currentTimeMillis() + ".xls";
					String photoFolder = req.getServletContext().getRealPath("excel");
					File f = new File(photoFolder, filename);
					f.getParentFile().mkdirs();
					FileOutputStream fos = new FileOutputStream(f);
					byte b[] = new byte[1024 * 1024];
					int length = 0;
					while (-1 != (length = is.read(b))) {
						fos.write(b, 0, length);
					}
					fos.close();
				}			
		}
			return filename;
}
}