Webdynpro文件上傳

1、Webdynpro 中的文件上傳和下載文件上傳下載操作步驟如下：一，建立一個webdynpro工程，如下圖，應用名(Application)為Webdynpro01,組件名 (Component) 為Webdynpro01Comp,視圖名(View)為Webdynpro01CompView, 窗口名(Window)名為Webdynpro01Window.二 ，打開view的大綱視圖，在Webdynpro01CompView中添加如下元素。注意，元素的Id屬性默認就行。添加元素后的效果如下圖：三，在Webdynpro01CompView的Context定義如下節(jié)點和元素，其中元素file和元素F

2、ileResource的類型為com.sap.ide.webdynpro.uielementdefinitions.Resource，元素OnDemandStream的類型為gmodel.api.IWDInputStream。注意，元素onDemandStream要進行如下圖的設置，把Calculated設置成true.四，對view中的元素進行綁定，元素綁定Context中的FileResource元素，上傳的Events事件中的onAction方法名為UploadFile，元素綁定Context中的file元素，并把其中的屬性behaviou

3、r設置成allowSave。五，在Webdynpro01CompView中添加如下代碼即可。 public void wdDoInit() /begin wdDoInit() IFileElement elem = wdContext.currentFileElement(); /getting the attributepointer of the calculated attributeIWDAttributePointer attributePointer = elem.getAttributePointer("onDemandStream"); IWDResourc

4、e resource = WDResourceFactory.createResource(attributePointer,"uploadtest.txt",WDWebResourceType.TXT); / setting value to the bound attribute elem.setFile(resource); IWDAttributeInfo attributeInfo = wdContext.getNodeInfo().getAttribute(IPrivateWebdynpro01CompView.IContextElement.FILE_RESO

5、URCE);attributeInfo.getModifiableSimpleType(); /end public gmodel.api.IWDInputStream getFileOnDemandStream(IPrivateWebdynpro01CompView.IFileElement element) /begin getFileOnDemandStream IWDInputStream stream = null; try String path = WDURLGenerator.getResourcePath(wdComponent

6、API.getDeployableObjectPart(),"uploadtest.txt"); stream = WDResourceFactory.createInputStream(new FileInputStream(path); catch (Exception ioExp) return stream; /end public void onActionUpLoadFile(gmodel.api.IWDCustomEvent wdEvent ) /begin onActionUpLoadFile(ServerEv

7、ent) IPrivateWebdynpro01CompView.IContextElement ele = wdContext.currentContextElement(); this.wdComponentAPI.getMessageManager().reportSuccess("come"); if(ele.getFileResource() != null) try IWDResource file = ele.getFileResource(); InputStream input = file.read(false); String rurl = this.

8、wdComponentAPI.getURLService().getResourcePath("download.txt"); OutputStream out = new FileOutputStream(new File(rurl.substring(0,rurl.lastIndexOf("/")+"/"+file.getResourceName(); int b = -1; while(b=input.read()!=-1) out.write(b); out.close(); input.close(); catch(Exception e ) e.printStackTrace(); else this.wdCom