package com.puckasoft.video312.upload;

import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.Iterator;
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.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadFile extends HttpServlet {

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//原理性實驗
//		InputStream is = request.getInputStream();    //獲得request的輸入流
//		FileOutputStream fos = new FileOutputStream(new File("d:/testUpload.jpg"));   
//		byte[] b = new byte[1024];
//		while(is.read(b)!=-1){
//			fos.write(b);
//		}
//		is.close();
//		fos.close();


		String tempDirectory = "d:/temp/";    //要在最后加上斜杠:temp/
		try {
			int sizeThreshold = 1024 * 64;  //寫滿該大小的緩存后，存入硬盤中。
			File repositoryFile = new File(tempDirectory);
			FileItemFactory factory = new DiskFileItemFactory(sizeThreshold, repositoryFile);


		ServletFileUpload upload = new ServletFileUpload(factory);
			upload.setSizeMax(500 * 1024 * 1024); // set every upload file'size less than 500M
			
			List items = upload.parseRequest(request);   //這里開始執行上傳
			Iterator iter = items.iterator();
			
			while (iter.hasNext()) {
				FileItem item = (FileItem) iter.next();   //FileItem就是表示一個表單域數據
				
				if(item.isFormField()){ //isFormField方法用于判斷FileItem是否代表一個普通表單域(即非file表單域)
					System.out.println("***"+item.getFieldName());	
				}else {
					String fieldName = item.getFieldName();  //獲取表單域name屬性的值
					String fileName = item.getName();     //返回該文件在客戶機上的文件名。e.g: e:\dianying\\video\1.wmv
					System.out.println("getFieldName:"+fieldName);
					System.out.println("getName:"+fileName);
					File uploadedFile = new File("d:/video/"+new Date().getTime()+fileName.substring(fileName.lastIndexOf(".")));
					item.write(uploadedFile);
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}


	}

}