所以我拥有一个包含三列的DataView
,其中一列是一个复选框列,允许用户检查他们想要下载哪些文件。
为了简单起见(我认为);我决定将文件压缩成一个zip文件,并在生成后提供服务。
这是我到目前为止所拥有的:
代码::
Button downloadLogButton = new Button("downloadlogbutton") {
private static final long serialVersionUID = 1L;
@Override
public void onSubmit() {
// Some utility class I made that zips files
LogUtility util = new LogUtility();
util.zipLogFiles("sample", logs);
}
};
Form logsForm = new Form("logsform") {
};
logsForm.add(downloadLogButton);
CheckGroup<File> checkGroup = new CheckGroup<File>("logscheckgroup", new ArrayList<File>());
WebMarkupContainer logsViewContainer = new WebMarkupContainer("datatable");
DataView<File> logsView = new DataView<File>("logrows", new ListDataProvider<File>(logs)) {
private static final long serialVersionUID = 1L;
public void populateItem(final Item<File> item) {
final File file = (File) item.getModelObject();
item.add(new Check<File>("logdownloadcheck", item.getModel()));
item.add(new Label("logname", file.getName()));
SimpleDateFormat sdf = new SimpleDateFormat( "E, dd MMM yyyy hh:mm a");
item.add(new Label("logdatemodified", sdf.format(file .lastModified())));
}
};
logsViewContainer.add(logsView);
checkGroup.add(logsViewContainer);
logsForm.add(checkGroup);
add(logsForm);
如何生成下载后的zip文件?我有什么选择?我希望避免将其重定向到确认页面或Your download is ready
页面。
更新
根据XaviLópez的回答,我在Button
的{{1}}函数中添加了以下代码。
onSubmit
我得到org.apache.wicket.util.file.File log = new org.apache.wicket.util.file.File("/home/keeboi/Downloads/sample.zip");
IResourceStream resourceStream = new FileResourceStream(log);
IRequestHandler target = new ResourceStreamRequestHandler(resourceStream);
getRequestCycle().scheduleRequestHandlerAfterCurrent(target);
。
答案 0 :(得分:5)
你可以像DownloadLink
那样做,并从压缩文件中创建FileResourceStream
。然后,只需更改当前请求周期的目标:
Button downloadLogButton = new Button("downloadlogbutton") {
private static final long serialVersionUID = 1L;
@Override
public void onSubmit() {
// Some utility class I made that zips files
LogUtility util = new LogUtility();
util.zipLogFiles("sample", logs);
IResourceStream resourceStream = new FileResourceStream(
new org.apache.wicket.util.file.File(someFile)); // Use whatever file you need here
IRequestTarget t = new ResourceStreamRequestTarget(stream){
@Override
public String getFileName() {
return "filename.zip";
}
}
getRequestCycle().setRequestTarget(t);
}
};
如果您想在下载后删除该文件,可以覆盖IRequestTarget#respond(RequestCycle)
,如下所示:
@Override
public void respond(RequestCycle requestCycle) {
super.respond(requestCycle);
// Delete the file
((FileResourceStream)getResourceStream()).getFile().delete();
}
以下相关问题也很有用: How to use Wicket's DownloadLink with a file generated on the fly?。