comm-upload 多文件上传重名文件丢失问题

starnight_cbj 2009-03-26 10:47:43





package example;



import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.List;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



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;



/**

 * 上传servlet

 * 

 * @author Administrator

 * 

 */

public class Upload extends HttpServlet {



	public Upload() {



	}



	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {



		DiskFileItemFactory factory = new DiskFileItemFactory();

		String path = getServletContext().getRealPath("/") + "upload/";// 取得站台文件夹路径

		factory.setRepository(new File(path));

		factory.setSizeThreshold(2 * 1024 * 1024);

		ServletFileUpload upload = new ServletFileUpload(factory);

		upload.setHeaderEncoding("utf-8");



		try {

			List<FileItem> list = upload.parseRequest(request);



			for (FileItem item : list) {

				if (item.isFormField()) {	// 如果是表单域，不是文件域

					String name = item.getFieldName();

					String value = item.getString("UTF-8");

				} else {

					String name = item.getFieldName();// 取得文件域的名称（name）

					String value = item.getName();// (表单值)

					if (!"".equals(value)) {// 文件域不为空的上传



						String fileName = getFileName(value);// 传入值取得文件名

						String fileType = getExt(fileName);// 取得后缀



						String fileNewName = String.valueOf(System

								.currentTimeMillis())

								+ "." + fileType;// 以时间命名



						System.out.println("文件名 : " + fileName);

						System.out.println("文件类型 : " + fileType);



					    // Thread.sleep(200);//这里停下时间，问题解决，但感觉不好！！

						File saveFile = new File(path, fileNewName);

						// File saveFile = new File(path, fileName);

						item.write(saveFile);



					}

				}

			}

		} catch (FileUploadException e) {



			System.out.println("文件上传出错" + e.getMessage());

			e.printStackTrace();

		} catch (Exception e) {

			System.out.println("写入硬盘出错" + e.getMessage());

			e.printStackTrace();

		}

		response.getWriter().print("Upload OK!");

	}



	/**

	 * 取得文件名

	 * 

	 * @param fieldValue

	 * @return

	 */

	private String getFileName(String fieldValue) {



		int fileNameIndex = fieldValue.lastIndexOf("\\");// 最后斜杠的位置

		String fieldName = fieldValue.substring(fileNameIndex + 1);



		return fieldName;

	}



	/**

	 * 取得文件后缀

	 * 

	 * @param fileName

	 * @return

	 */

	private String getExt(String fileName) {

		String type = fileName.substring(fileName.lastIndexOf(".") + 1);

		return type;

	}



}