在Java小程序中上传FTP文件期间显示进度
好的,这样我就可以使用Java
FTP上传文件,我想更新标签和进度条。用百分比文本标签,用百分比int值标记。现在,使用当前代码,在上传结束时只能获得100和完整条。在上传过程中,它们均未更改。
这里是:
OutputStream output = new BufferedOutputStream(ftpOut); CopyStreamListener listener = new CopyStreamListener() {
public void bytesTransferred(long totalBytesTransferred, int bytesTransferred, long streamSize) {
System.out.printf("\r%-30S: %d / %d", "Sent", totalBytesTransferred, streamSize);
ftpup.this.upd(totalBytesTransferred,streamSize);
}
public void bytesTransferred(CopyStreamEvent arg0) { }
};
Util.copyStream(input, output, ftp.getBufferSize(), f.length(), listener);
}
public void upd(long num, long size){
int k = (int) ((num*100)/size);
System.out.println(String.valueOf(k));
this.d.setText(String.valueOf(k));
//d.setText(String.valueOf(k));
progressBar.setValue(k);
}
回答:
从它的声音(并且没有任何证据可以证明主观)看来,您在事件调度线程中处理一个耗时的动作
您可能想阅读Swing中的并发性以获得更多了解
我建议使用SwingWorker进行实际的传输并利用其内置的进度支持
- 不要将重组分与轻组分混合。更改
Applet
为JApplet
,更改TextField
为JTextField
,请勿Canvas
使用aJPanel
或JComponent
- 如果您希望其他人阅读您的代码,请为变量使用专有名称,我不知道它是什么
p
。 - 你
Thread
没用。而不是启动线程并使用它的run
方法,您只需在它的构造函数中进行下载调用。这对您无济于事…
移除您的实作,MyThread
并以取代
public class MyWorker extends SwingWorker<Object, Object> { private URL host;
private File outputFile;
public MyWorker(URL host, File f) {
this.host = host;
outputFile = f;
}
@Override
protected Object doInBackground() throws Exception {
// You're ignoring the host you past in to the constructor
String hostName = "localhost";
String username = "un";
String password = "pass";
String location = f.toString();
//FTPClient ftp = null;
ftp.connect(hostName, 2121);
ftp.login(username, password);
ftp.setFileType(FTP.BINARY_FILE_TYPE);
ftp.setKeepAlive(true);
ftp.setControlKeepAliveTimeout(3000);
ftp.setDataTimeout(3000); // 100 minutes
ftp.setConnectTimeout(3000); // 100 minutes
ftp.changeWorkingDirectory("/SSL");
int reply = ftp.getReplyCode();
System.out.println("Received Reply from FTP Connection:" + reply);
if (FTPReply.isPositiveCompletion(reply)) {
System.out.println("Connected Success");
}
System.out.println(f.getName().toString());
File f1 = new File(location);
in = new FileInputStream(f1);
FileInputStream input = new FileInputStream(f1);
// ftp.storeFile(f.getName().toString(),in);
//ProgressMonitorInputStream is= new ProgressMonitorInputStream(getParent(), "st", in);
OutputStream ftpOut = ftp.storeFileStream(f.getName().toString());
System.out.println(ftpOut.toString());
//newname hereSystem.out.println(ftp.remoteRetrieve(f.toString()));
OutputStream output = new BufferedOutputStream(ftpOut);
CopyStreamListener listener = new CopyStreamListener() {
public void bytesTransferred(final long totalBytesTransferred, final int bytesTransferred, final long streamSize) {
setProgress((int) Math.round(((double) totalBytesTransferred / (double) streamSize) * 100d));
}
@Override
public void bytesTransferred(CopyStreamEvent arg0) {
// TODO Auto-generated method stub
}
};
Util.copyStream(input, output, ftp.getBufferSize(), f.length(), listener);
return null;
}
}
在您ActionListener
的o
(??)中,将线程执行代码替换为
try { MyWorker worker = new MyWorker(new URL("http://localhost"), file);
worker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if (evt.getPropertyName().equals("progress")) {
Integer progress = (Integer) evt.getNewValue();
progressBar.setValue(progress);
}
}
});
worker.execute();
} catch (MalformedURLException ex) {
ex.printStackTrace();
}
注意。您将忽略传递给构造函数的URL。http://不是ftp://,所以我怀疑这是否有效…
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