下面代码的想法是在加载延迟加载面板时在浏览器中显示下载对话框。
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.wicket.Component;
import org.apache.wicket.extensions.ajax.markup.html.AjaxLazyLoadPanel;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.panel.EmptyPanel;
import org.apache.wicket.request.handler.resource.ResourceStreamRequestHandler;
import org.apache.wicket.request.resource.ContentDisposition;
import org.apache.wicket.util.resource.AbstractResourceStreamWriter;
public class LazyLoadedPage extends WebPage {
public LazyLoadedPage() {
add(new Label("text", "waiting..."));
add(new AjaxLazyLoadPanel("lazy") {
@Override
public Component getLazyLoadComponent(final String id) {
try {
Thread.sleep(2000);
} catch (final InterruptedException e) {
throw new RuntimeException(e);
}
final ResourceStreamRequestHandler handler = new ResourceStreamRequestHandler(new Resource(),
"test2.txt");
// handler.setContentDisposition(ContentDisposition.ATTACHMENT);
getRequestCycle().scheduleRequestHandlerAfterCurrent(handler);
return new EmptyPanel(id);
}
});
}
class Resource extends AbstractResourceStreamWriter {
@Override
public void write(final OutputStream output) throws IOException {
final File tempFile = File.createTempFile("test", "txt");
final FileOutputStream fos = new FileOutputStream(tempFile);
fos.write("text".getBytes());
fos.close();
final FileInputStream fis = new FileInputStream(tempFile);
final byte[] buff = new byte[10];
final int cnt = fis.read(buff);
output.write(buff, 0, cnt);
}
}
}
但是当我尝试它时，我在 Wicket Ajax 调试窗口中收到此错误：
ERROR: Wicket.Ajax.Call.failure: Error while parsing response: Error: Invalid XML: text
如何修复我的代码（可能使用另一种方法）？