flex +jsp 文件上传

最新推荐文章于 2021-02-20 22:10:24 发布

转载最新推荐文章于 2021-02-20 22:10:24 发布 · 1.1k 阅读

文章标签：

#flex #jsp #string #function #import #file

本文介绍了一个使用Flash技术实现的文件上传组件，支持多种文件类型筛选，并具备进度显示及大小限制功能。通过具体代码展示了如何利用Flash进行文件选择、上传及处理过程。

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upload.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" fontSize="12">

<mx:Script>
<![CDATA[

  import flash.net.FileReference;
  import flash.events.IOErrorEvent;
  import mx.controls.Alert;

   private var myFileReference:FileReference = new FileReference();


  private function uploadfile():void{

      var imageTypes:FileFilter = new FileFilter("Images (*.jpg, *.jpeg, *.gif, *.png)", "*.jpg; *.jpeg; *.gif; *.png");
            var textTypes:FileFilter = new FileFilter("Files (*.txt, *.doc,*.xls,*.rar)", "*.txt; *.doc;*.xls;*.rar");
            var allTypes:Array = new Array(imageTypes, textTypes);
      myFileReference.browse(allTypes);

      myFileReference.addEventListener(Event.SELECT, selectHandler);
            myFileReference.addEventListener(Event.COMPLETE, completeHandler);
            myFileReference.addEventListener(IOErrorEvent.IO_ERROR,ioerror);
            myFileReference.addEventListener(ProgressEvent.PROGRESS, progressHandler);

        }
        private function progressHandler(event:ProgressEvent):void {
            var file:FileReference = FileReference(event.target);
            var baifenbi:Number=(event.bytesLoaded /event.bytesTotal)*100;
            bar.label=baifenbi.toString().substring(0,3)+"%";
            bar.setProgress(baifenbi,100);

            if(event.bytesTotal>=1024*1024*10){
          Alert.show("文件大小超出10M");
          myFileReference.cancel();
          upbtn.enabled=true;
          bar.label="";

          }
        }

        private function ioerror(event:Event):void{

        Alert.show("IO错误！/n确认服务器端是否有权限上传！","警告");
        upbtn.enabled=true;

        }
        private function selectHandler(event:Event):void{

          var request:URLRequest = new URLRequest("../a.jsp")


            try
              {
              myFileReference.upload(request);
              upbtn.enabled=false;
              }
            catch (error:Error)
              {
                Alert.show("没有上传文件");
                upbtn.enabled=true;
              }

         }


       private function completeHandler(event:Event):void
         {
          Alert.show("上传完成！");
          upbtn.enabled=true;
        }

]]>
</mx:Script>
<mx:Button id="upbtn" x="401" y="223" label="上传(小于10M)" click="uploadfile()"/>
<mx:ProgressBar id="bar" labelPlacement="bottom" themeColor="#F20D7A"
minimum="0" visible="true" maximum="100" label=""
direction="right" mode="manual" width="340" x="53" y="223"/>

</mx:Application>

a.jsp

<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<html><head><title>upFile</title></head>
<body>
<%
//定义上载文件的最大字节
int MAX_SIZE = 1024*1024*10;
System.out.println("最大上传大小："+MAX_SIZE/1024/1024+"M");
// 创建根路径的保存变量
String rootPath;
//声明文件读入类
DataInputStream in = null;
FileOutputStream fileOut = null;
//取得客户端的网络地址
String remoteAddr = request.getRemoteAddr();

//获得服务器的名字
String serverName = request.getServerName();

//取得互联网程序的绝对地址
String realPath = request.getRealPath(serverName);

realPath = realPath.substring(0,realPath.lastIndexOf("//"));

//创建文件的保存目录
rootPath = realPath + "//upload//";
System.out.println("文件的保存目录="+rootPath);

//取得客户端上传的数据类型
String contentType = request.getContentType();

try{
if(contentType.indexOf("multipart/form-data") >= 0){
//读入上传的数据
in = new DataInputStream(request.getInputStream());
int formDataLength = request.getContentLength();
if(formDataLength > MAX_SIZE){
System.out.println("上传的文件字节数不可以超过" + MAX_SIZE/1024/1024+"M");
return;
}
//保存上传文件的数据
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
//上传的数据保存在byte数组
while(totalBytesRead < formDataLength){
byteRead = in.read(dataBytes,totalBytesRead,formDataLength);
totalBytesRead += byteRead;
}
//根据byte数组创建字符串
String file = new String(dataBytes);
//out.println(file);
//取得上传的数据的文件名

Date mydate=new Date();
long mytime=mydate.getTime();
//String saveFile =String.valueOf(mytime);

String saveFile = file.substring(file.indexOf("filename=/"") + 10);

saveFile = saveFile.substring(0,saveFile.indexOf("/n"));

saveFile = saveFile.substring(saveFile.lastIndexOf("//") + 1,saveFile.indexOf("/""));

String dianArr[]=saveFile.split("[.]");

saveFile=String.valueOf(mytime)+"."+dianArr[dianArr.length-1];

int lastIndex = contentType.lastIndexOf("=");
//取得数据的分隔字符串
String boundary = contentType.substring(lastIndex + 1,contentType.length());
//创建保存路径的文件名
String fileName = rootPath + saveFile;
//out.print(fileName);
int pos;
pos = file.indexOf("filename=/"");
pos = file.indexOf("/n",pos) + 1;
pos = file.indexOf("/n",pos) + 1;
pos = file.indexOf("/n",pos) + 1;
int boundaryLocation = file.indexOf(boundary,pos) - 4;
//out.println(boundaryLocation);
//取得文件数据的开始的位置
int startPos = ((file.substring(0,pos)).getBytes()).length;
//out.println(startPos);
//取得文件数据的结束的位置
int endPos = ((file.substring(0,boundaryLocation)).getBytes()).length;
//out.println(endPos);
//检查上载文件是否存在
File checkFile = new File(fileName);
if(checkFile.exists()){
System.out.println(saveFile + "文件已经存在");
}
//检查上载文件的目录是否存在
File fileDir = new File(rootPath);
if(!fileDir.exists()){
fileDir.mkdirs();
}
//创建文件的写出类
fileOut = new FileOutputStream(fileName);
//保存文件的数据
fileOut.write(dataBytes,startPos,(endPos - startPos));
fileOut.close();
System.out.println(saveFile + "文件成功上载");
}else{
String content = request.getContentType();