flex文件上传，mmons－fileupload做后台

最新推荐文章于 2016-01-03 09:58:11 发布

最新推荐文章于 2016-01-03 09:58:11 发布 · 186 阅读

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#Flex #Struts #Apache #Servlet #Web

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本文介绍了一个使用Flex前端和Java后端实现文件上传的应用案例。前端通过ActionScript处理文件选择和上传过程，并与Struts框架集成；后端采用Apache Commons FileUpload组件处理上传的文件。

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[color=red]flex端的AS代码: [/color]

internal function init():void{ 
    Security.allowDomain("*"); 
     file = new FileReference();   
     file.addEventListener(Event.SELECT, onSelect);   
    file.addEventListener(ProgressEvent.PROGRESS, processHandler);   
    file.addEventListener(IOErrorEvent.IO_ERROR,ioShow);                 
    } 
internal function ioShow(evt: IOErrorEvent){ 
     Alert.show(evt.toString(),"IO错误"); 
    } 
internal function doSelect():void{ 
//文件类型限制，第一个是文件类型选项只显示"png"类型的，第二个是只把.png文件显示出来
     var imageTypes:FileFilter = new FileFilter("png", "*.png");   
     var allTypes:Array = new Array(imageTypes);   
     file.browse(allTypes); 
    } 
internal function onSelect(evt:Event):void{ 
     pic_txt.text = file.name; 
    } 
internal function doUpload():void{ 
//指向struts的一个action,或servlte,注意一写要写完整路径 
     var request:URLRequest = new URLRequest("http://localhost:8080/productManage/uploadPic.do"); 

     fileName = "productImage\\"+new Date().getTime().toString() +".png"; 
       request.data = new URLVariables("filename="+fileName); 
          file.upload(request); 
       CursorManager.setBusyCursor(); 
    } 
//上传完成更新源 
    internal function processHandler(evt:ProgressEvent):void{ 
     if(evt.bytesLoaded == evt.bytesTotal){ 

      CursorManager.removeBusyCursor(); 

      var n:Number = new Date().getTime();           
      img.source = fileName +"?time="+n; 
     } 
    }  
<mx:TextInput id="pic_txt" width="150"/> 
   <mx:Button label="选择文件" click="doSelect()"/> 
   <mx:Button label="开始上传" click="doUpload()"/>

[color=red]java端: [/color]

import java.io.File; 
import java.util.List; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import org.apache.commons.fileupload.DiskFileUpload; 
import org.apache.commons.fileupload.FileItem; 
import org.apache.commons.fileupload.FileUploadException; 
import org.apache.struts.action.Action; 
import org.apache.struts.action.ActionForm; 
import org.apache.struts.action.ActionForward; 
import org.apache.struts.action.ActionMapping; 
public class UploadPicAction extends Action { 
public ActionForward execute(ActionMapping mapping, ActionForm form, 
   HttpServletRequest request, HttpServletResponse response) { 
  response.setContentType("text/html; charset=UTF-8"); 
  DiskFileUpload upload = new DiskFileUpload(); 
  try { 
   List itemlist = upload.parseRequest(request); 
//itemlist里包含多个参数，所以要判断一下是文件类型，还是参数字段，这里修改一下可以用于多个文件上传
   for (int i = 0; i < itemlist.size(); i++) { 
    FileItem item = (FileItem) itemlist.get(i); 
    if (item.isFormField())[color=red]//是表单字段跳过 [/color]
     continue; 
    String name = request.getRealPath("") + "[url=file://\\bin\\]\\bin\\[/url]" 
      + request.getParameter("filename");//获得Web应用绝对路径，如果路径不在web应用下，由于安全机制，将会说"找不到系统指定路径" 

    try { 
     File f = new File(name); 
     item.write(f); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
   } 
  } catch (FileUploadException e) { 
   e.printStackTrace(); 
  } 
  return null; 
} 
}