Flex、java实现文件上传

发布时间：2020-12-15 04:44:43 所属栏目：百科来源：网络整理

导读：FileUpload.java: [java] ? view plain copy print ? import ?java.io.File;?? import ?java.io.IOException;?? import ?java.io.PrintWriter;?? import ?java.util.Iterator;?? import ?java.util.List;?? import ?javax.servlet.ServletException;?? impor

FileUpload.java:

[java]? 
   view plain 
   copy 
   print 
   ? 
    
   
 import?java.io.File;??
 import?java.io.IOException;??
import?java.io.PrintWriter;??
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.FileUploadException;??
import?org.apache.commons.fileupload.disk.DiskFileItemFactory;??
import?org.apache.commons.fileupload.servlet.ServletFileUpload;??
 @SuppressWarnings("serial")??
public?class?FileUpload?extends?HttpServlet???
 {??
 ????//定义文件上传的路径??
 ????private?String?uploadPath?=?"d://a//";??
 ??????
private?int?maxPostSize?=?100*1024*1024;??
 ????public?FileUpload()???
 ????{??
 ????????super();??
 ????}??
void?destroy()???
super.destroy();???
 ????@SuppressWarnings("unchecked")??
protected?void?processRequest(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,IOException??
 ????????System.out.println("Access!");??
 ????????response.setContentType("text/html;charset=UTF-8");??
 ????????PrintWriter?out?=?response.getWriter();??
 ????????out.print("已连接上!");??
 ??????????
 ????????//保存文件到服务器中??
 ????????DiskFileItemFactory?factory?=?new?DiskFileItemFactory();??
 ????????factory.setSizeThreshold(4096);??
 ????????ServletFileUpload?upload?=?new?ServletFileUpload(factory);??
 ????????upload.setSizeMax(maxPostSize);??
try??
 ????????{??
 ????????????List?fileItems?=?upload.parseRequest(request);??
 ????????????Iterator?iter?=?fileItems.iterator();??
 ????????????while(iter.hasNext())??
 ????????????{??
 ????????????????FileItem?item?=?(FileItem)iter.next();??
 ????????????????if(!item.isFormField())??
 ????????????????{??
 ????????????????????String?name?=?item.getName();??
 ????????????????????System.out.println(name);??
 ????????????????????try??
 ????????????????????{??
 ????????????????????????item.write(new?File(uploadPath+name));??
 ????????????????????}??
catch(Exception?e)??
 ????????????????????????e.printStackTrace();??
 ????????????????}??
 ????????????}??
 ????????}??
catch(FileUploadException?e)??
 ????????????e.printStackTrace();??
 ????????????System.out.println(e.getMessage()+"结束");??
 ????????}??
void?doGet(HttpServletRequest?request,?IOException???
 ????????processRequest(request,?response);??
void?doPost(HttpServletRequest?request,108); list-style:decimal-leading-zero outside; color:inherit; line-height:17.27272605895996px"> }??

FileUpload.mxml

[c-sharp]? 
   ?

<?xml?version="1.0"?encoding="utf-8"?>??

<mx:Application?xmlns:mx="http://www.adobe.com/2006/mxml"?layout="absolute"?creationComplete="init()">??
????<mx:Script>??
????????<![CDATA[??
????????????import?flash.net.FileReference;??
????????????import?mx.controls.Alert;??
????????????import?mx.events.CloseEvent;??
????????????import?flash.events.*;??
??????????????
????????????private?var?file:FileReference;??
private?function?init():void??
????????????{??
????????????????Security.allowDomain("*");??
????????????????file?=?new?FileReference();??
????????????????file.addEventListener(ProgressEvent.PROGRESS,?onProgress);??
????????????????file.addEventListener(Event.SELECT,?onSelect);??
????????????????file.addEventListener(Event.COMPLETE,?completeHandle);??
??????????????
private?function?completeHandle(event:Event):void??
????????????????Alert.show("恭喜你，上传成功");??
????????????}??
private?function?upload(): ????????????????var?imageTypes:FileFilter?=?new?FileFilter("Images?(*.jpg,?*.jpeg,?*.png)","*.jpg;*.jpeg;*.png");??
????????????????var?allTypes:Array?=?new?Array(imageTypes);??
????????????????file.browse(allTypes);??
????????????????//file.browse();??
private?function?onSelect(e:Event): ????????????????Alert.show("上传?"?+?file.name?+?"?(共?"?+?Math.round(file.size)?+?"?字节)?","确认上传",Alert.YES|Alert.NO,null,proceedWithUpload);??
private?function?onProgress(e:ProgressEvent): ????????????????lbProgress.text?=?"已上传?"+e.bytesLoaded?+?"?字节，共?"+e.bytesTotal+"?字节";??
????????????????var?proc:uint?=?e.bytesLoaded/e.bytesTotal*100;??
????????????????bar.setProgress(proc,100);??
????????????????bar.label?=?"当前进度：?"+"?"+proc?+?"%";??
private?function?proceedWithUpload(e:CloseEvent): ????????????????if(e.detail?==?Alert.YES)??
????????????????{??
????????????????????var?request:URLRequest?=?new?URLRequest("http://localhost:8080/FileUpload/servlet/FileUpload");??
????????????????????????file.upload(request);??
catch(error:Error)??
????????????????????????Alert.show("上传失败");??
????????]]>??
????</mx:Script>??
????<mx:Canvas?width="100%"?height="100%"?x="10"?y="170"?fontSize="12">??
????????<mx:VBox?width="100%"?horizontalAlign="center">??
????????????<mx:Label?id="lbProgress"?text="上传"?/>??
????????????<mx:ProgressBar?id="bar"?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:Application>??

配置到tomcat上的时候，要在web-inf/lib里面要加入连个包：

commons-fileupload-1.2.1.jar
commons-io-1.4.jar

这两个包在网上很容易下载到。加入包以后要修改web.xml，在跟下加入下面servlet声明：

[xhtml]? 
   ?

<servlet>??

????servlet-name>FileUpload</>??
????servlet-class servlet-mappingurl-pattern>/servlet/FileUpload>??

我的文件是上传到D盘的a文件夹，要确保该目录存在。上传个图片试试吧！

（编辑：李大同）

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