这是我的 servlet 的一部分:
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
@SuppressWarnings("deprecation")
Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(req);
UserService userService = UserServiceFactory.getUserService();
User user = userService.getCurrentUser();
ServletFileUpload upload = new ServletFileUpload();
FileItemIterator iterator;
try {
iterator = upload.getItemIterator(req);
Picture pic = null;
PictureAccess access = null;
while(iterator.hasNext()){
FileItemStream item = iterator.next();
pic = new Picture( blobs.get(item.getFieldName()).getKeyString() );
access = new PictureAccess();
access.addPictures(pic, user.getEmail() );
}
} catch (FileUploadException e) {
e.printStackTrace();
}
res.sendRedirect("/user/picture/upload.jsp");
}
在我的客户端,我使用 JavaScript 来更改文件的名称:
<script type="text/javascript">
function uploadFile() {
if (window.File && window.FileList) {
var fd = new FormData();
var files = document.getElementById('fileToUpload').files;
for ( var i = 0; i < files.length; i++) {
fd.append("file" + i, files[i]);
}
var xhr = new XMLHttpRequest();
xhr.open("POST", document.getElementById('uploadForm').action);
xhr.send(fd);
alert('already saved');
document.getElementById('uploadForm').value = '';
} else {
document.getElementById('uploadForm').submit(); //no html5
}
}
</script>
在我的 html/jsp 中:
<form id="uploadForm" enctype="multipart/form-data" method="post" action="<%= blobstoreService.createUploadUrl("/user/uploadPics") %>">
<input type="file" name="fileToUpload" id="fileToUpload" multiple="multiple" size="5"/>
<input type="button" onclick="uploadFile();" value="Upload" />
</form>
上面的代码在开发机器上工作,但在部署时不工作。可能的错误和解决问题的方法是什么?如何在 appengine 中查看错误?