HTML5实现多文件的上传示例代码

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
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;

/**
 * Servlet implementation class UploadPhotoServlet
 */
public class UploadPhotoServlet extends HttpServlet {
private static final long serialVersiOnUID= 1L;

/**
 * @see HttpServlet#HttpServlet()
 */
public UploadPhotoServlet() {
super();
// TODO Auto-generated constructor stub
}

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
 *      response)
 */
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
 *      response)
 */
@SuppressWarnings("unchecked")
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String imagePath = "c:\\uploadFile\\Image\\" + getEachDate() + "\\";// 按日期生成文件夹
File uploadPath = new File(imagePath);
if (!uploadPath.exists()) {
uploadPath.mkdirs();
}
File tmp = new File("c:\\tmp\\");
if (!tmp.exists()) {
tmp.mkdirs();
}
DiskFileItemFactory factory = new DiskFileItemFactory();// 创建磁盘工厂
factory.setRepository(tmp);// 设置文件缓存路径
factory.setSizeThreshold(10 * 1096);// 将文件保存在内存还是磁盘临时文件夹的默认临界值，值为10240，即10kb
ServletFileUpload sfu = new ServletFileUpload(factory);// 创建处理工具
sfu.setSizeMax(10 * 1024 * 1024);// 服务器端可以接收的最大文件大小，-1表示无上限
String fileName = null;
try {
List list = sfu.parseRequest(request);// 解析
if (list.size() <1) {
return;
}
for (int j = 0; j FileItem item = list.get(j);
fileName = item.getName();
if (fileName.equals("")) {
request.getRequestDispatcher("/com/visualizerPhoto.jsp")
.forward(request, response);
return;
}
int pos = fileName.lastIndexOf(".");// 取图片文件格式
if (pos > 0) {
Date date = new Date();
fileName = imagePath + date.getTime()
+ fileName.substring(pos);
}
System.out.println("item:" + item);
item.write(new File(fileName));// 写到磁盘
}
} catch (FileUploadException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}

// 13-11-15
public static String getEachDate() {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, 0);
String yesterday = new SimpleDateFormat("yyyy-MM-dd ").format(cal
.getTime());
String[] dates = yesterday.split("-");
String realDate = dates[0].substring(2, 4) + "-" + dates[1] + "-"
+ dates[2];
return realDate.trim();
}
}