Java 使用 Zk 框架上传文件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19013970/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Upload files with Zk framework
提问by user2768380
I need upload csv files in ZK this is my zul page:
我需要在 ZK 中上传 csv 文件，这是我的 zul 页面：
<zk>
<window
apply="org.zkoss.bind.BindComposer"
viewModel="@id('vm') @init('UploadVM')"
title="win"
position="center"
mode="overlapped"
border="normal"
width="300px"
height="200px">
<button
label="upload"
upload="true,maxsize=801192"
onUpload="@command('uploadFile',upload=event)"
autodisable="self" />
</window>
</zk>
And my java page:
还有我的 Java 页面：
public class UploadVM {
private Media media;
public Media getMedia(){
return media;
}
@NotifyChange("media")
@Command
public void uploadFile(@ContextParam(ContextType.TRIGGER_EVENT) UploadEvent event) {
media = event.getMedia();
media.getStreamData();
}
But with this simple example i have the following error:
但是在这个简单的例子中，我有以下错误：
Use getStringData() instead
And i don not know what happen.
我不知道会发生什么。
Who can help me???
谁能帮我？？？
回答by Eugene Evdokimov
You should know the format of the media before getting data from it.
According to the documentationmedia data can be in the binaryor text-basedformat. To retrieve its content you should use getByteData()or getStreamData()in the former case and getStringData()or getReaderData()in the latter. For example,
在从中获取数据之前，您应该了解媒体的格式。根据文档媒体数据可以是binary或text-based格式。要检索其内容，您应该使用getByteData()或getStreamData()在前一种情况下和/getStringData()或getReaderData()在后一种情况下。例如，
media = event.getMedia();
if (media.isBinary()) {
InputStream is = media.getStreamData();
} else {
String s = media.getStringData();
}
回答by Sitansu
I have a best example dropuploadfor uploading csvfile,i thing it
will help you for better understanding.
我有一个dropupload上传csv文件的最佳示例，我认为它会帮助您更好地理解。
index.zul
索引.zul
<?page title="Auto Generated index.zul"?>
<window title="Drop here" border="normal" width="100%" height="100%"
apply="org.zkoss.bind.BindComposer"
viewModel="@id('vm') @init('com.demo.DropFileViewModel')">
<dropupload maxsize="5120" detection="none"
onUpload="@command('doUpload')">
</dropupload>
<button label="Download" onClick="@command('doDownload')"></button>
</window>
DropFileViewModel.java
DropFileViewModel.java
package com.demo;
import org.zkoss.bind.BindContext;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.ContextParam;
import org.zkoss.bind.annotation.ContextType;
import org.zkoss.util.media.Media;
import org.zkoss.zhtml.Filedownload;
import org.zkoss.zk.ui.event.UploadEvent;
import org.zkoss.zul.Messagebox;
public class DropFileViewModel {
Media media;
@Command
public void doUpload(@ContextParam(ContextType.BIND_CONTEXT) BindContext ctx) {
UploadEvent upEvent = null;
Object objUploadEvent = ctx.getTriggerEvent();
if (objUploadEvent != null && (objUploadEvent instanceof UploadEvent)) {
upEvent = (UploadEvent) objUploadEvent;
}
if (upEvent != null) {
media = upEvent.getMedia();
Messagebox.show("File Uploaded: " + media.getName());
}
}
@Command
public void doDownload() {
if (media != null)
Filedownload.save(media);
else
Messagebox.show("First Drop Your File");
}
}
Thanks
谢谢
回答by Klaudiusz Skowronski
It is my solution for generating PDF document:
这是我生成PDF文档的解决方案：
@Command
@NotifyChange("savePDF")
public void savePDF() throws IOException, Exception {
File f = new File("PDF_test.pdf");
OutputStream file = new FileOutputStream(f);
Document document = new Document();
PdfWriter.getInstance(document, file);
Filedownload.save(f, "application/pdf");
PdfPTable table=new PdfPTable(3);
PdfPCell cell .....
}
