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() + "\\";// 按日期生成資料夾
		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();// 建立磁碟工廠
		factory.setRepository(tmp);// 設定檔案快取路徑
		factory.setSizeThreshold(10 * 1096);// 將檔案儲存在記憶體還是磁碟臨時資料夾的預設臨界值，值為10240，即10kb
		ServletFileUpload sfu = new ServletFileUpload(factory);// 建立處理工具
		sfu.setSizeMax(10 * 1024 * 1024);// 伺服器端可以接收的最大檔案大小，-1表示無上限
		String fileName = null;
		try {
			List<FileItem> list = sfu.parseRequest(request);// 解析
			if (list.size() < 1) {
				return;
			}
			for (int j = 0; j < list.size(); 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(".");// 取圖片檔案格式
				if (pos > 0) {
					Date date = new Date();
					fileName = imagePath + date.getTime()
							+ fileName.substring(pos);
				}
				System.out.println("item:" + item);
				item.write(new File(fileName));// 寫到磁碟
			}
		} 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();
	}
}