package?upload;

import?java.io.File;
import?java.io.IOException;
import?java.io.PrintWriter;
import?java.util.Date;
import?java.util.List;

import?javax.servlet.ServletConfig;
import?javax.servlet.ServletContext;
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;

/**
?*?
?*?文件上傳?具體步驟：?1）獲得磁盤文件條目工廠?DiskFileItemFactory?要導包?2）?利用?request?獲取?真實路徑
?*?，供臨時文件存儲，和?最終文件存儲?，這兩個存儲位置可不同，也可相同?3）對?DiskFileItemFactory?對象設置一些?屬性
?*?4）高水平的API文件上傳處理?ServletFileUpload?upload?=?new?ServletFileUpload（factory）;
?*?目的是調用?parseRequest（request）方法?獲得?FileItem?集合list?，
?*?
?*?5）在?FileItem?對象中?獲取信息，?遍歷，?判斷?表單提交過來的信息?是否是?普通文本信息?另做處理?6）?第一種.?用第三方?提供的
?*?item.write（?new?File（pathfilename）?）;?直接寫到磁盤上?第二種.?手動處理
?*?
?*/
public?class?UploadProcessorServlet?extends?HttpServlet?{
	private?static?final?long?serialVersionUID?=?1L;
	//?保存文件的目錄
	private?static?String?PATH_FOLDER?=?“/“;
	//?存放臨時文件的目錄
	private?static?String?TEMP_FOLDER?=?“/“;
	
	
	@Override
	public?void?init（ServletConfig?config）?throws?ServletException?{
		ServletContext?servletCtx?=?config.getServletContext（）;
		//?初始化路徑
		//?保存文件的目錄
		PATH_FOLDER?=?servletCtx.getRealPath（“/upload“）;
		//?存放臨時文件的目錄存放xxx.tmp文件的目錄
		TEMP_FOLDER?=?servletCtx.getRealPath（“/uploadTemp“）;
	}

	/**
	?*?@see?HttpServlet#doGet（HttpServletRequest?request?HttpServletResponse
	?*??????response）
	?*/
	protected?void?doGet（HttpServletRequest?request
			HttpServletResponse?response）?throws?ServletException?IOException?{
		request.setCharacterEncoding（“utf-8“）;?//?設置編碼
		response.setCharacterEncoding（“utf-8“）;
		response.setContentType（“text/html;charset=UTF-8“）;
		//?獲得磁盤文件條目工廠
		DiskFileItemFactory?factory?=?new?DiskFileItemFactory（）;
		
		//?如果沒以下兩行設置的話，上傳大的?文件?會占用?很多內存，
		//?設置暫時存放的?存儲室??這個存儲室，可以和?最終存儲文件?的目錄不同
		/**
		?*?原理?它是先存到?暫時存儲室，然后在真正寫到?對應目錄的硬盤上，?按理來說?當上傳一個文件時，其實是上傳了兩份，第一個是以?.tem
		?*?格式的?然后再將其真正寫到?對應目錄的硬盤上
		?*/
		factory.setRepository（new?File（TEMP_FOLDER））;
		//?設置?緩存的大小，當上傳文件的容量超過該緩存時，直接放到?暫時存儲室
		factory.setSizeThreshold（1024?*?1024）;

		//?高水平的API文件上傳處理
		ServletFileUpload?upload?=?new?ServletFileUpload（factory）;
		
		try?{
			//?提交上來的信息都在這個list里面
			//?這意味著可以上傳多個文件
			//?請自行組織代碼
			List?list?=?upload.parseRequest（request）;
			//?獲取上傳的文件
			FileItem?item?=?getUploadFileItem（list）;
			//?獲取文件名
			String?filename?=?getUploadFileName（item）;
			//?保存后的文件名
			String?saveName?=?new?Date（）.getTime（）?+?filename.substring（filename.lastIndexOf（“.“））;
			//?保存后圖片的瀏覽器訪問路徑
			String?picUrl?=?request.getScheme（）+“://“+request.getServerName（）+“:“+request.getServerPort（）+request.getContextPath（）+“/uploa

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-07-06?08:20??ajaxFileUpload\
?????文件?????????850??2016-07-06?08:20??ajaxFileUpload\.classpath
?????文件????????1339??2016-07-06?08:23??ajaxFileUpload\.project
?????目錄???????????0??2016-07-06?08:23??ajaxFileUpload\.settings\
?????文件?????????522??2016-07-06?08:20??ajaxFileUpload\.settings\.jsdtscope
?????文件??????????90??2016-07-06?08:23??ajaxFileUpload\.settings\com.genuitec.eclipse.core.prefs
?????文件??????????57??2016-07-06?08:22??ajaxFileUpload\.settings\org.eclipse.core.resources.prefs
?????文件?????????364??2016-07-06?08:20??ajaxFileUpload\.settings\org.eclipse.jdt.core.prefs
?????文件?????????501??2016-07-06?08:20??ajaxFileUpload\.settings\org.eclipse.wst.common.component
?????文件?????????345??2016-07-06?08:20??ajaxFileUpload\.settings\org.eclipse.wst.common.project.facet.core.xml
?????文件??????????49??2016-07-06?08:20??ajaxFileUpload\.settings\org.eclipse.wst.jsdt.ui.superType.container
?????文件???????????6??2016-07-06?08:20??ajaxFileUpload\.settings\org.eclipse.wst.jsdt.ui.superType.name
?????目錄???????????0??2016-07-06?08:20??ajaxFileUpload\src\
?????目錄???????????0??2016-07-06?08:20??ajaxFileUpload\src\upload\
?????文件????????5388??2016-07-06?08:20??ajaxFileUpload\src\upload\UploadProcessorServlet.java
?????目錄???????????0??2016-07-06?08:22??ajaxFileUpload\WebRoot\
?????文件????????8568??2016-07-06?08:22??ajaxFileUpload\WebRoot\ajaxfileupload.js
?????文件????????1159??2016-07-06?08:22??ajaxFileUpload\WebRoot\ajaxFileUpload.jsp
?????文件???????25773??2016-07-06?08:22??ajaxFileUpload\WebRoot\ajaxupload.js
?????文件????????1263??2016-07-06?08:22??ajaxFileUpload\WebRoot\ajaxupload.jsp
?????文件?????????508??2016-07-06?08:22??ajaxFileUpload\WebRoot\index.jsp
?????文件???????93871??2016-07-06?08:22??ajaxFileUpload\WebRoot\jquery.js
?????文件????????4204??2016-07-06?08:22??ajaxFileUpload\WebRoot\loading.gif
?????目錄???????????0??2016-07-06?08:20??ajaxFileUpload\WebRoot\meta-INF\
?????文件??????????39??2016-07-06?08:20??ajaxFileUpload\WebRoot\meta-INF\MANIFEST.MF
?????目錄???????????0??2016-07-06?08:21??ajaxFileUpload\WebRoot\upload\
?????目錄???????????0??2016-07-06?08:21??ajaxFileUpload\WebRoot\uploadTemp\
?????目錄???????????0??2016-07-06?08:20??ajaxFileUpload\WebRoot\WEB-INF\
?????文件???????????9??2016-07-06?08:20??ajaxFileUpload\WebRoot\WEB-INF\.gitignore
?????目錄???????????0??2016-07-06?08:21??ajaxFileUpload\WebRoot\WEB-INF\classes\
?????目錄???????????0??2016-07-06?08:21??ajaxFileUpload\WebRoot\WEB-INF\classes\upload\
............此處省略5個文件信息