Webdynpro文件上传下载.docx

Webdynpro 中的文件上传和下载文件上传下载操作步骤如下：一，建立一个webdynpro工程，如下图，应用名(Application)为Webdynpro01,组件名 (Component)为Webdynpro01Comp,视图名(View)为Webdynpro01CompView, 窗口名(Window)名为Webdynpro01Window.二，打开view的大纲视图，在Webdynpro01CompView中添加如下元素。注意，元素的Id属性默认就行。添加元素后的效果如下图：三，在Webdynpro01CompView的Context定义如下节点和元素，其中元素file和元素FileResource的类型为com.sap.ide.webdynpro.uielementdefinitions.Resource，元素OnDemandStream的类型为com.sap.tc.webdynpro.progmodel.api.IWDInputStream。注意，元素onDemandStream要进行如下图的设置，把Calculated设置成true.四，对view中的元素进行绑定，元素绑定Context中的FileResource元素，上传的Events事件中的onAction方法名为UploadFile，元素绑定Context中的file元素，并把其中的属性behaviour设置成allowSave。五，在Webdynpro01CompView中添加如下代码即可。publicvoid wdDoInit() {//@@begin wdDoInit() IFileElement elem = wdContext.currentFileElement();//getting the attributepointer of the calculated attributeIWDAttributePointer attributePointer = elem.getAttributePointer(onDemandStream);IWDResource resource = WDResourceFactory.createResource(attributePointer,uploadtest.txt,WDWebResourceType.TXT);// setting value to the bound attributeelem.setFile(resource);IWDAttributeInfo attributeInfo = wdContext.getNodeInfo().getAttribute(IPrivateWebdynpro01CompView.IContextElement.FILE_RESOURCE);attributeInfo.getModifiableSimpleType();//@@end }public com.sap.tc.webdynpro.progmodel.api.IWDInputStream getFileOnDemandStream(IPrivateWebdynpro01CompView.IFileElement element) {//@@begin getFileOnDemandStream IWDInputStream stream = null;try { String path = WDURLGenerator.getResourcePath(wdComponentAPI.getDeployableObjectPart(),uploadtest.txt); stream = WDResourceFactory.createInputStream(new FileInputStream(path)); } catch (Exception ioExp) { }return stream;//@@end }publicvoid onActionUpLoadFile(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent ) {//@@begin onActionUpLoadFile(ServerEvent) IPrivateWebdynpro01CompView.IContextElement ele = wdContext.currentContextElement();this.wdComponentAPI.getMessageManager().reportSuccess(come);if(ele.getFileResource() != null)