[英]Java jSch Exec with progress bar and real time output to a JTextArea
[英]java catch process time real time progress bar
new Scanner(new URL("SOME_URL.txt").openStream(), "UTF-8").useDelimiter("\\A").next();
使用此^,我从保存在字符串中的.txt文件获取数据。
对于我的progress bar
,我想知道这样的工作(或者通常是方法等)是否有可能计算(或类似地)完成工作的时间。 这样我就可以在bar
实时显示process time
。
这可能吗?
编辑:
package app.gui;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.net.URL;
import java.util.Scanner;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import org.apache.commons.io.IOUtils;
public class Updater {
private JFrame frame;
private static String rawG;
private static String versI;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
rawG = new Scanner(new URL("SOME_URL.txt").openStream(), "UTF-8").useDelimiter("\\A").next();
versI = IOUtils.toString(getClass().getClassLoader().getResourceAsStream("version.txt"));
} catch (Exception e) {
System.out.println("error class Updater try/catch raw github");
}
if (Integer.parseInt(rawG.split("\\.")[0]) < Integer.parseInt(versI.split("\\.")[0])) {
System.out.println("Version check failure, update needed");
try {
Updater window = new Updater();
window.frame.setVisible(true);
} catch (Exception e) {
System.out.println("error class Updater try/catch initialize frame");
}
} else {
System.out.println("Version check correct, no update needed");
}
}
});
}
public Updater() {
initialize();
}
private void initialize() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException
| UnsupportedLookAndFeelException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
frame.getContentPane().add(panel, BorderLayout.SOUTH);
panel.setLayout(new BorderLayout(0, 0));
JProgressBar progressBar = new JProgressBar();
progressBar.setStringPainted(true);
panel.add(progressBar, BorderLayout.NORTH);
}
}
可能吗? 是。 使用Scanner.next()读取URL的内容时可以吗? 没有。
您将需要自己读取字节并计数:
URL url = new URL("SOME_URL.txt");
URLConnection conn = url.openConnection();
ByteBuffer buffer = ByteBuffer.allocate(conn.getContentLength());
EventQueue.invokeLater(() -> progressBar.setMaximum(buffer.limit()));
EventQueue.invokeLater(() -> progressBar.setValue(0));
try (ReadableByteChannel channel = Channels.newChannel(conn.getInputStream())) {
while (channel.read(buffer) >= 0) {
EventQueue.invokeLater(() -> progressBar.setValue(buffer.position()));
}
}
buffer.flip();
String rawG = StandardCharsets.UTF_8.decode(buffer).toString();
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.