import java.io.File;

import java.util.*;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Iterator;



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.FileUploadBase.SizeLimitExceededException;

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

import org.apache.commons.fileupload.servlet.ServletFileUpload;







@SuppressWarnings("serial")

public class UploadServlet extends HttpServlet{



	@Override

	protected void doGet(HttpServletRequest req, HttpServletResponse resp)

			throws ServletException, IOException {

		doPost(req, resp);

	}



	@SuppressWarnings({ "deprecation", "unchecked" })

	@Override

	protected void doPost(HttpServletRequest req, HttpServletResponse resp)

			throws ServletException, IOException {

		final long MAX_SIZE = 10*1024*1024;	//设置上传文件最大为10M

		final String[] allowedExt = new String[]{"jpg","jpeg","gif","txt","doc","docx","mp3","wma","w4a","bmp","JPG"};

		resp.setContentType("text/html");

		//设置字符编码为UTF-8，这样支持汉字显示

		resp.setCharacterEncoding("UTF-8");

		//实例化一个硬盘文件工厂，用来配置上传组件ServletFileUpload

		DiskFileItemFactory dfif = new DiskFileItemFactory();

		//设置上传文件时用于临时存放文件的内存大小，这里是4K，多余部分将临时存在硬盘

		dfif.setSizeThreshold(4096);

		//设置存放临时文件的目录，web根目录下的ImagesUploadTemp

		dfif.setRepository(new File(req.getRealPath("/")+"ImagesUploadTemp"));

		//用以上工厂实例化上传组件

		ServletFileUpload sfu = new ServletFileUpload(dfif);

		//设置最大上传尺寸

		sfu.setSizeMax(MAX_SIZE);

		PrintWriter out = resp.getWriter();

		//从req得到所有上传域的列表

		List fileList = null;

		try {

			fileList = sfu.parseRequest(req);		

		}catch(FileUploadException e) {			//处理文件尺寸过大异常

			if(e instanceof SizeLimitExceededException) {

				out.println("文件尺寸超过规定大小：" + MAX_SIZE + "字节</p>");

				out.println("<a href=\"\\chap11\\fileupload.jsp\" target=\"_top\">返回</a>");

				return;

			}

			//没有文件上传

			if(fileList == null || fileList.size() == 0) {

				out.println("请选择上传文件1</p>");

				out.println("<a href=\"\\chap11\\fileupload.jsp\" target=\"_top\">返回</a>");

				return;

			}

			//得到所有上传的文件

			Iterator fileltr = fileList.iterator();

			//循环处理所有文件

			while(fileltr.hasNext()) {

				FileItem fileitem = null;

				String path = null;

				long size = 0;

				//得到当前文件

				fileitem = (FileItem)fileltr.next();