在研究Flex DataGrid导入excel时,用到了Flex的文件上传功能。 (参见我的Blog:http://cwfmaker.iteye.com/blog/539449) 在Adobe的Flex RIA编程环境下,是无法读取本地文件的(据我所知),但是我们可以依赖于Flex调用后台的代码实现文件上传功能,我这里是利用Flex的URLRequest来向java的Servlet传送一个Http请求(Servlet集成自HttpServlet ,已实现文件上传功能),而Servlet响应请求之后会利用Apcahe的开源Jar包(org.apache.commons.fileupload.servlet.ServletFileUpload类)完成文件的生成。 通过以上原理就可以利用Flex+java实现文件上传。(这里也是参考了网上的一些文章)
java Servlet 代码
package com.yyhy.java.util; //多文件上传的Java端的类 import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.ServletException; import java.util.List; import java.util.Iterator; import java.io.File; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.net.URLDecoder; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.commons.fileupload.FileItem; import org.apache.log4j.Logger; import org.apache.commons.lang.ObjectUtils; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class FileUploadAction extends HttpServlet { // 限制文件的上传大小 private int maxPostSize = 100 * 1024 * 1024; //文件上传地址 private String uploadPath; public FileUploadAction() { //从配置文件中取得文件上传地址 setUploadPath(); } public String getUploadPath() { return uploadPath; } public void setUploadPath() { //从配置文件中取得文件上传地址 ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); ServerAddress serverAddressBean=(ServerAddress)context.getBean("ServerAddressBean"); this.uploadPath = serverAddressBean.getUploadPath().trim(); } // 文件上传 public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException { this.doUploadAdd(request, response); } private void logger(String info) { System.out.println(info); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doUploadAdd(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doUploadAdd(request, response); } private void doUploadAdd(HttpServletRequest request, HttpServletResponse response) throws ServletException { logger("begin to upload"); try { request.setCharacterEncoding("UTF-8");// 防止文件名称带有汉字后传到服务器乱码 //建立文件夹 this.makeDir(uploadPath); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } saveFiletoServer(request,response,uploadPath); } private void doUploadDelete(HttpServletRequest request,HttpServletResponse response) throws ServletException { String dirtyStr = "";//需要删除的文件名(单个文件)或文件夹名列表 try { if (request.getParameter("dirtyStr") != null) { dirtyStr=URLDecoder.decode(request.getParameter("dirtyStr"),"utf-8");//前台ENCODE,后台DECODE logger("删除的文件(夹)为:" + dirtyStr); } } catch (Exception e) { // TODO Auto-generated catch block logger(e.getMessage()); } try { new DeleteFiles().DeleteModifyFiles(dirtyStr, uploadPath); } catch (Exception e) { logger(e.getMessage()); } } //保存文件到服务器中 private void saveFiletoServer(HttpServletRequest request,HttpServletResponse response,String uploadPath) { // 操作文件 response.setContentType("text/html; charset=UTF-8"); DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(1024 * 4); ServletFileUpload upload = new ServletFileUpload(factory); upload.setFileSizeMax(maxPostSize); logger("request========" + ObjectUtils.toString(request)); List fileItems = null; try { fileItems = upload.parseRequest(request); logger("============" + ObjectUtils.toString(fileItems)); Iterator iter = fileItems.iterator(); while (iter.hasNext()) { FileItem item = (FileItem) iter.next(); log(item.toString()); if (!item.isFormField()) { String name = item.getName(); logger("上传的文件名 = " + name); try { item.write(new File(uploadPath + name)); } catch (Exception ex) { logger(ex.getMessage()); } } } } catch (FileUploadException ex1) { logger("FileUploadException->" + ex1.getMessage()); } } // 建立文件夹路径 private boolean makeDir(String uploadPath) { boolean isOK = false; try { File file = new File(uploadPath); file.mkdirs(); isOK = true; } catch (Exception e) { isOK = false; } finally { return isOK; } } // 建立文件夹路径 private boolean makeDirs(String uploadPath, String newDocStr) { boolean isOK = false; File file; String[] temp; try { temp = newDocStr.split(","); for (int i = 0; i < temp.length; i++) { file = new File(uploadPath + temp[i] + "\\"); file.mkdirs(); } isOK = true; } catch (Exception e) { isOK = false; } finally { return isOK; } } }
Flex前台代码:
<?xml version="1.0" encoding="utf-8"?> <mx:TitleWindow xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" layout="absolute" width="400" height="300" creationComplete="CreationCompletedHandler()" showCloseButton="true"> <fx:Script> <![CDATA[ import mx.controls.Alert; import mx.events.CloseEvent; import mx.managers.PopUpManager; import mx.utils.StringUtil; [Bindable] private var _filename:String; public function get filename():String { return _filename; } public function set filename(value:String):void { _filename = value; } [Bindable] private var _file:FileReference=new FileReference(); public function get file():FileReference { return _file; } public function set file(value:FileReference):void { _file = value; } [Bindable] private var _serveraddress:String; public function get serveraddress():String { return _serveraddress; } public function set serveraddress(value:String):void { _serveraddress = value; } /**creationComplete完成之后调用,获取服务器地址,建立事件监听 * @param null * @author 陈文锋 [email protected] * @return void * */ public function CreationCompletedHandler():void { Security.allowDomain("*"); var urlLoader:URLLoader=new URLLoader(new URLRequest("assets/conf/ServerAddressConfig.xml")); urlLoader.addEventListener(Event.COMPLETE,CompletedHandler); this.addEventListener(Event.CLOSE,TitleWindowClose); file.addEventListener(ProgressEvent.PROGRESS,progressHandler); file.addEventListener(Event.SELECT,selectedHandler); file.addEventListener(IOErrorEvent.IO_ERROR,ioErrorHandler); } private function ioErrorHandler(e:IOErrorEvent):void { Alert.show(e.toString()); } private function progressHandler(e:ProgressEvent):void { lblProgress.text = " 已上传 " + e.bytesLoaded + " 字节,共 " + e.bytesTotal + " 字节"; var proc: uint = e.bytesLoaded / e.bytesTotal * 100; uploadbar.setProgress(proc, 100); uploadbar.label= "当前进度: " + " " + proc + "%"; } /**Event事件监听处理函数,弹出上传提示窗口 * @param e,Event类型事件参数 * @author [email protected] * @return void * */ private function selectedHandler(e:Event):void { Alert.show("上传 " + file.name + " (共 "+Math.round(file.size/1024)+"KB)?", "确认上传", Alert.YES|Alert.NO, null, proceedWithUpload); } /**CloseEvent事件监听处理函数,访问upload的servlet服务 * @param e,Event类型事件参数 * @author [email protected] * @return void * */ private function proceedWithUpload(e:CloseEvent): void{ if (e.detail == Alert.YES) { filename=file.name; var request:URLRequest = new URLRequest(StringUtil.trim(serveraddress)); try { file.upload(request); } catch (error:Error) { Alert.show("上传失败","错误"); } } } private function upload(): void{ var typefiter:FileFilter=new FileFilter("Excel","*.xls"); file.browse([typefiter]); } /**CloseEvent事件监听处理函数,关闭TitleWindow弹出窗口 * @param e,事件参数 * @author [email protected] * @return void * */ private function TitleWindowClose(e:CloseEvent):void { PopUpManager.removePopUp(this); } /**Event事件监听处理函数,获取配置文件的文件上传路径 * @param e,事件参数 * @author [email protected] * @return void * */ private function CompletedHandler(e:Event):void { var configurationxml:XML=XML((URLLoader(e.target).data)); serveraddress=configurationxml.filesinservername; } ]]> </fx:Script> <mx:Canvas width="100%" height="100%"> <mx:VBox width="100%" horizontalAlign="center"> <mx:Label id="lblProgress" text="上传"/> <mx:ProgressBar id="uploadbar" labelPlacement="bottom" themeColor="#F20D7A" minimum="0" visible="true" maximum="100" label="当前进度: 0%" direction="right" mode="manual" width="200"/> <mx:Button label="上传文件" click="upload()"/> </mx:VBox> </mx:Canvas> </mx:TitleWindow>