最近我制作了一个控制台程序,可以为我更新插件。我认为如果将它从控制台程序转换为 JFrame/UI 会更好看。我几乎是一个初学者,但我似乎在任何地方都找不到如何在每个方法完成后将文本添加到 JFrame/Panel。有点像进度条,但只是描述“幕后”发生的事情的文字。没什么特别的,但至少比我运行我的 jar 时更直观一点,我所看到的只是一个窗口加载环旋转了几秒钟。
public static void main(String[] args) {
JFrame frame = new JFrame("Updater");
JLabel label1=new JLabel("Testprogram 1",JLabel.LEFT);
JLabel label2=new JLabel("Method 1..",JLabel.LEFT);
JLabel label3=new JLabel("Method 3..",JLabel.LEFT);
JLabel label4=new JLabel("Method 4...",JLabel.LEFT);
JLabel label5=new JLabel("Done!",JLabel.LEFT);
JPanel panel=new JPanel();
panel.setLayout(new GridLayout(5,1));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300,300);
frame.setLocationRelativeTo(null);
frame.add(panel,BorderLayout.CENTER);
panel.setBackground(Color.WHITE);
frame.setResizable(false);
frame.setVisible(true);
panel.add(label1);
panel.add(label2);
panel.add(label3);
panel.add(label4);
panel.add(label5);
CreateFrame();
Start();
CreateDir();
LinkList();
Download();
unzip();
DeleteZip();
}
我尝试在每个方法之后添加标签,但我猜它不会那样工作,除非它实时“更新”。我希望有人理解我想要实现的目标。
最佳答案
我怀疑您有一大堆长时间运行的代码占用了您的 GUI,阻止它绘制和与用户交互。如果是这样,您需要阅读 Concurrency in Swing看看为什么你的程序没有像你期望的那样运行。
请注意,dani-h 的示例将面临 Swing 线程问题的风险,因为他在调用他的 Swing 代码的同一线程上调用 Thread.sleep(...)。如果他在 Swing 事件线程上正确启动了他的 Swing GUI,或者如果您尝试在任何其他 Swing 程序中使用他的代码,它将锁定,并且您最终会遇到与开始时相同的问题。
下面是使用 dani-h 示例的更正代码,但使用 SwingWorker 更正了他的线程问题:
import java.awt.Dimension;
import java.awt.Window;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;
@SuppressWarnings("serial")
public class Example2 extends JPanel {
private static final int PREF_W = 400;
private static final int PREF_H = 200;
private JLabel label = new JLabel();
public Example2() {
add(label);
final MySwingWorker mySwingWorker = new MySwingWorker();
mySwingWorker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent pcEvt) {
if (MySwingWorker.STEP_PERFORMING.equals(pcEvt.getPropertyName())) {
label.setText(mySwingWorker.getStepPerforming());
} else if (pcEvt.getNewValue() == SwingWorker.StateValue.DONE) {
Window win = SwingUtilities.getWindowAncestor(Example2.this);
win.dispose();
}
}
});
mySwingWorker.execute();
}
public Dimension getPreferredSize() {
return new Dimension(PREF_W, PREF_H);
}
private static void createAndShowGUI() {
Example2 example = new Example2();
JFrame frame = new JFrame("Example 2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(example);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
class MySwingWorker extends SwingWorker<Void, Void> {
public static final String STEP_PERFORMING = "step performing";
private static final long SLEEP_DELAY = 1500;
private String stepPerforming = "";
@Override
protected Void doInBackground() throws Exception {
start();
createDir();
linkList();
download();
unzip();
deletezip();
return null;
}
public String getStepPerforming() {
return stepPerforming;
}
public void setStepPerforming(String stepPerforming) {
String oldValue = this.stepPerforming;
String newValue = stepPerforming;
this.stepPerforming = stepPerforming;
firePropertyChange(STEP_PERFORMING, oldValue, newValue);
}
private void start() {
setStepPerforming("Starting...");
// Start();
try {
Thread.sleep(SLEEP_DELAY);
} catch (InterruptedException e) {}
}
private void createDir() {
setStepPerforming("Executing Create Directory");
// CreateDir();
try {
Thread.sleep(SLEEP_DELAY);
} catch (InterruptedException e) {}
}
private void linkList() {
setStepPerforming("Executing Link List");
// LinkList();
try {
Thread.sleep(SLEEP_DELAY);
} catch (InterruptedException e) {}
}
private void download() {
setStepPerforming("Executing Download");
// Download();
try {
Thread.sleep(SLEEP_DELAY);
} catch (InterruptedException e) {}
}
private void unzip() {
setStepPerforming("Executing Unzip");
// unzip();
try {
Thread.sleep(SLEEP_DELAY);
} catch (InterruptedException e) {}
}
private void deletezip() {
setStepPerforming("Executing Delete zip");
// DeleteZip();
try {
Thread.sleep(SLEEP_DELAY);
} catch (InterruptedException e) {}
}
}
关于java - 在 JFrame 上每个方法完成后写一个字符串,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20980975/