Java中的SwingWorker

Question

我有个问题.

我有一个JFrame.它会创造一个JDialog.

当按下按钮时JDialog,应该处理它并发送电子邮件.与此同时,我需要另一个JDialog不确定的出现JProgressBar.发送电子邮件时,JDialog应该处理(和新的一个),或者它的内容应该更改.

我已经失败了好几个小时了,所以我问enyone他(或她)是否愿意给我写一个能做我想做的伪代码.

只是为了看看SwingWorker课程中应该包含什么(或者如果你觉得它更好的话就使用多线程),何时JDialog应该创建/处理,以及在电子邮件发送中的位置...

我知道我在这里要求一个完整的解决方案,但我已经在dedline并且已经失败了很多次......这是我的最后一招......

Answer 1

我做了一个简短的例子,希望它有所帮助.基本上显示了一个带JFrame按钮:

当JButton点击框架时,JDialog将出现另一个JButton(发送电子邮件) - 这将代表电子邮件对话框:

当JButton上emailDialog按下其配置的emailDialog,并创建一个新的JDialog将举行的进度(或在这种情况下,一个简单的JLabel):

然后它创建并执行SwingWorker发送电子邮件和dispose()的JDialog当其完成并显示JOptionPane出发送的成功消息:

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class Test {

    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new Test().createAndShowUI();
            }
        });
    }

    private void createAndShowUI() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        initComponents(frame);
        frame.setPreferredSize(new Dimension(300, 300));//testing purposes
        frame.pack();
        frame.setVisible(true);
    }

    private void initComponents(final JFrame frame) {

        final JDialog emailDialog = new JDialog(frame);
        emailDialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        emailDialog.setLayout(new BorderLayout());

        JButton sendMailBtn = new JButton("Send Email");
        sendMailBtn.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                //get content needed for email from old dialog

                //get rid of old dialog
                emailDialog.dispose();

                //create new dialog
                final JDialog emailProgressDialog = new JDialog(frame);
                emailProgressDialog.add(new JLabel("Mail in progress"));
                emailProgressDialog.pack();
                emailProgressDialog.setVisible(true);

                new Worker(emailProgressDialog).execute();

            }
        });

        emailDialog.add(sendMailBtn, BorderLayout.SOUTH);
        emailDialog.pack();

        JButton openDialog = new JButton("Open emailDialog");
        openDialog.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                emailDialog.setVisible(true);
            }
        });

        frame.getContentPane().add(openDialog);

    }
}

class Worker extends SwingWorker<String, Object> {

    private final JDialog dialog;

    Worker(JDialog dialog) {
        this.dialog = dialog;
    }

    @Override
    protected String doInBackground() throws Exception {

        Thread.sleep(2000);//simulate email sending

        return "DONE";
    }

    @Override
    protected void done() {
        super.done();
        dialog.dispose();
        JOptionPane.showMessageDialog(dialog.getOwner(), "Message sent", "Success", JOptionPane.INFORMATION_MESSAGE);

    }
}