【发布时间】：2013-09-11 04:59:35
【问题描述】：
我正在使用这个库：http://www.moxiegroup.com/moxieapps/gwt-uploader/，在我的 Web 应用程序中上传文件。我按照这里解释的步骤：http://www.moxiegroup.com/moxieapps/gwt-uploader/userguide.jsp，并在他们的展示中使用第一个示例：http://www.moxiegroup.com/moxieapps/gwt-uploader/showcase/index.jsp，我用我的 servlet 的信息修改了方法Upload.setUploadURL() 中的参数，似乎一切正常。服务器日志甚至说文件已成功上传。我的问题是我找不到它（文件）。我应该在哪里寻找它或者我可以在哪里设置文件应该上传的路径？
这是客户端代码：
包org.moxieapps.gwt.uploader.showcase.client；
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import org.moxieapps.gwt.uploader.client.Uploader;
import org.moxieapps.gwt.uploader.client.events.*;
/**
* Simple Text Link and Progress text label example of GWT Uploader
*/
public class TextButtonAndProgressText implements EntryPoint {
private Label progressLabel;
private Uploader uploader;
public void onModuleLoad() {
progressLabel = new Label();
progressLabel.setStyleName("progressLabel");
uploader = new Uploader();
uploader.setUploadURL("/DevNullUploadServlet")
.setButtonText("<span class=\"buttonText\">Click to Upload</span>")
.setButtonTextStyle(".buttonText {font-family: Arial, sans-serif; font-size: 14px; color: #BB4B44}")
.setFileSizeLimit("50 MB")
.setButtonWidth(150)
.setButtonHeight(22)
.setButtonCursor(Uploader.Cursor.HAND)
.setButtonAction(Uploader.ButtonAction.SELECT_FILE)
.setUploadProgressHandler(new UploadProgressHandler() {
public boolean onUploadProgress(UploadProgressEvent uploadProgressEvent) {
progressLabel.setText(NumberFormat.getPercentFormat().format(
(double)uploadProgressEvent.getBytesComplete() / (double)uploadProgressEvent.getBytesTotal()
));
return true;
}
})
.setUploadSuccessHandler(new UploadSuccessHandler() {
public boolean onUploadSuccess(UploadSuccessEvent uploadSuccessEvent) {
resetText();
StringBuilder sb = new StringBuilder();
sb.append("File ").append(uploadSuccessEvent.getFile().getName())
.append(" (")
.append(NumberFormat.getDecimalFormat().format(uploadSuccessEvent.getFile().getSize() / 1024))
.append(" KB)")
.append(" uploaded successfully at ")
.append(NumberFormat.getDecimalFormat().format(
uploadSuccessEvent.getFile().getAverageSpeed() / 1024
))
.append(" Kb/second");
progressLabel.setText(sb.toString());
return true;
}
})
.setFileDialogCompleteHandler(new FileDialogCompleteHandler() {
public boolean onFileDialogComplete(FileDialogCompleteEvent fileDialogCompleteEvent) {
if (fileDialogCompleteEvent.getTotalFilesInQueue() > 0 && uploader.getStats().getUploadsInProgress() <= 0) {
progressLabel.setText("0%");
uploader.setButtonText("<span class=\"buttonText\">Uploading...</span>");
uploader.startUpload();
}
return true;
}
})
.setFileQueueErrorHandler(new FileQueueErrorHandler() {
public boolean onFileQueueError(FileQueueErrorEvent fileQueueErrorEvent) {
resetText();
Window.alert("Upload of file " + fileQueueErrorEvent.getFile().getName() + " failed due to [" +
fileQueueErrorEvent.getErrorCode().toString() + "]: " + fileQueueErrorEvent.getMessage()
);
return true;
}
})
.setUploadErrorHandler(new UploadErrorHandler() {
public boolean onUploadError(UploadErrorEvent uploadErrorEvent) {
resetText();
Window.alert("Upload of file " + uploadErrorEvent.getFile().getName() + " failed due to [" +
uploadErrorEvent.getErrorCode().toString() + "]: " + uploadErrorEvent.getMessage()
);
return true;
}
});
VerticalPanel verticalPanel = new VerticalPanel();
verticalPanel.add(uploader);
verticalPanel.add(progressLabel);
verticalPanel.setCellHorizontalAlignment(uploader, HorizontalPanel.ALIGN_LEFT);
verticalPanel.setCellHorizontalAlignment(progressLabel, HorizontalPanel.ALIGN_LEFT);
//noinspection GwtToHtmlReferences
RootPanel.get("TextButtonAndProgressText").add(verticalPanel);
}
private void resetText() {
progressLabel.setText("");
uploader.setButtonText("<span class=\"buttonText\">Click to Upload</span>");
}
}
这是服务器代码：
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
public class FileUploadServlet extends HttpServlet {
private long FILE_SIZE_LIMIT = 20 * 1024 * 1024; // 20 MiB
private final Logger logger = Logger.getLogger("UploadServlet");
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
DiskFileItemFactory fileItemFactory = new DiskFileItemFactory();
ServletFileUpload fileUpload = new ServletFileUpload(fileItemFactory);
fileUpload.setSizeMax(FILE_SIZE_LIMIT);
List<FileItem> items = fileUpload.parseRequest(req);
for (FileItem item : items) {
if (item.isFormField()) {
logger.log(Level.INFO, "Received form field:");
logger.log(Level.INFO, "Name: " + item.getFieldName());
logger.log(Level.INFO, "Value: " + item.getString());
} else {
logger.log(Level.INFO, "Received file:");
logger.log(Level.INFO, "Name: " + item.getName());
logger.log(Level.INFO, "Size: " + item.getSize());
}
if (!item.isFormField()) {
if (item.getSize() > FILE_SIZE_LIMIT) {
resp.sendError(HttpServletResponse.SC_REQUEST_ENTITY_TOO_LARGE,
"File size exceeds limit");
return;
}
// Typically here you would process the file in some way:
// InputStream in = item.getInputStream();
// ...
if (!item.isInMemory())
item.delete();
}
}
} catch (Exception e) {
logger.log(Level.SEVERE, "Throwing servlet exception for unhandled exception", e);
throw new ServletException(e);
}
}
}
【问题讨论】：
标签： java gwt file-upload