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POInterrupt file upload when some condition is not true
 

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  1. POInterrupt file upload when some condition is not true
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    <p>I want to implement this: while uploading a file check file extension if it's not .zip, the upload will be interrupted and a message is showed to the user so i wrote this:</p> <pre><code>// Implement both receiver that saves upload in a file and // listener for successful upload class ReportUploader implements Receiver, SucceededListener { public File file; public OutputStream receiveUpload(String filename, String mimeType) { // Create upload stream FileOutputStream fos = null; // Stream to write to String userHome = System.getProperty("user.home"); String ext = filename.substring(filename.lastIndexOf('.')); System.out.println("+++++++++++&gt;" + ext); if (!ext.equals(".zip")) { Notification.show("Could not upload file", Notification.TYPE_ERROR_MESSAGE); return null; } try { file = new File(userHome + "/uploads/report/" + filename); fos = new FileOutputStream(file); } catch (final java.io.FileNotFoundException e) { Notification.show("Could not open file", e.getMessage(), Notification.TYPE_ERROR_MESSAGE); return null; } return fos; } public void uploadSucceeded(SucceededEvent event) { String filename; String basepath; String folderName; String uploadDir; filename = event.getFilename(); basepath = VaadinService.getCurrent().getBaseDirectory().getAbsolutePath(); uploadDir = Utilities.getProperty("uploadDir", basepath + "/WEB-INF/properties/config.properties"); file = new File(uploadDir + filename); folderName = filename.substring(0, filename.length() - 5); Utilities.unZipFolder(uploadDir + filename, uploadDir + folderName); addFilename(folderName); try { Utilities.deleteCompressedReport(file); } catch (IOException e) { e.printStackTrace(); } Notification.show("upload finished", Notification.TYPE_HUMANIZED_MESSAGE); } private void addFilename(String sFilename) { reportDirList.add(sFilename); selectDir.addItem(sFilename); } } </code></pre> <p>When the extension is not .zip, this error is accrued:</p> <pre><code>com.vaadin.server.UploadException: Upload failed at com.vaadin.server.communication.FileUploadHandler.streamToReceiver(FileUploadHandler.java:581) at com.vaadin.server.communication.FileUploadHandler.handleFileUploadValidationAndData(FileUploadHandler.java:419) at com.vaadin.server.communication.FileUploadHandler.doHandleSimpleMultipartFileUpload(FileUploadHandler.java:382) at com.vaadin.server.communication.FileUploadHandler.handleRequest(FileUploadHandler.java:267) at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1329) at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:236) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722) Caused by: com.vaadin.server.NoOutputStreamException at com.vaadin.server.communication.FileUploadHandler.streamToReceiver(FileUploadHandler.java:518) ... 22 more </code></pre> <p>So How to interrupt upload and show the message?</p>
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