flex+java实现文件的上传

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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.javaeye.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

Java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：

Actionscript代码复制代码

<?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 54cwf@163.com
* @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 54cwf@163.com
* @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 54cwf@163.com
* @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 54cwf@163.com
* @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 54cwf@163.com
* @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>