Java 中的 SwingWorker [英] SwingWorker in Java

问题描述

我有问题.

我有一个 JFrame.它将创建一个 JDialog.

I have a JFrame. It will create a JDialog.

当 JDialog 上的按钮被按下时，它应该被处理并发送一封电子邮件.同时，我需要另一个 JDialog 以不确定的 JProgressBar 出现.发送电子邮件时，JDialog 应该被处理(并生成新的)或者它的内容应该改变.

When button on JDialog is pressed it should be disposed and an email should be sent. At the same time, I need another JDialog to appear with indetermined JProgressBar. When email is sent, JDialog should either be disposed (and new one creted) or it's contents should change.

我已经失败了几个小时了，所以我问大家他(或她)是否愿意给我写一个伪代码来做我想做的事.

I have been failing with this for several hours now, so I'm asking enyone if he (or she) would be kind enough to write me a pseudo-code that will do what I want.

只是看看应该在 SwingWorker 类中包含什么(或者如果你认为它更好，则使用多线程)，何时应该创建/处置 JDialog(s)，以及在哪里坚持发送电子邮件...

Just to see what should be included in SwingWorker class (or use multithreading if you think it's better), when JDialog(s) should be created/disposed, and where to stick in the email sending...

我知道我在这里要求一个完整的解决方案，但我在一个截止日期并且已经失败了很多次......这是我最后的手段......

I know I'm asking for a finished solution here, but I'm on a dedline and have failed so many times already... This was my last resort...

推荐答案

我为你做了一个简短的例子，希望对你有所帮助.基本上显示了一个带有按钮的 JFrame:

I did a short example for you hope it helps. Basically a JFrame witha button is shown:

当点击框架上的 JButton 时，会出现一个 JDialog 和另一个 JButton(发送电子邮件)- 这将代表电子邮件对话框:

when the JButton on the frame is clicked a JDialog will appear with another JButton (Send Email) - this would represent the email dialog:

当 emailDialog 上的 JButton 被按下时，它会处理 emailDialog 并创建一个新的 JDialog将保存 progressbar(或者在这种情况下是一个简单的 JLabel):

When the JButton on the emailDialog is pressed it disposes of the emailDialog and creates a new JDialog which will hold the progressbar (or in this case a simple JLabel):

然后它创建并执行 SwingWorker 以发送电子邮件和 JDialog 的 dispose() 完成并显示 JOptionPane 显示发送成功的消息:

and then it creates and executes the SwingWorker to send the email and dispose() of the JDialog when its done and show a JOptionPane message showing success of the sending:

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);

    }
}

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