swing与并发【工作线程】【拥有临时结果的任务】
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2022-07-12 14:35:44
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就是工作线程在后台运行到半拉,给出一个临时数据信息,也就是说临时的结果
方法就是在工作线程中使用publish()方法将中间数据存入其中,再覆盖process方法,存入的中间数据将被他调到事件分派线程来
方法就是在工作线程中使用publish()方法将中间数据存入其中,再覆盖process方法,存入的中间数据将被他调到事件分派线程来
//这段代码主要是为读者展示如何处理正在运行的程序的中间结果 import java.awt.Component; import java.awt.Dimension; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.List; import javax.swing.SwingUtilities; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.SwingWorker; public class threadtest { static final int WIDTH=600; static final int HEIGHT=800; JFrame frame; JPanel pane; static JTextField text1; private worker wor1; private worker wor2; public void add(Component c,GridBagConstraints constraints,int x,int y,int w,int h) { constraints.gridx=x; constraints.gridy=y; constraints.gridwidth=w; constraints.gridheight=h; pane.add(c,constraints); } public threadtest() { frame=new JFrame("中间结果任务测试"); pane=new JPanel(); frame.setContentPane(pane); Toolkit kit=Toolkit.getDefaultToolkit(); Dimension screenSize=kit.getScreenSize(); int width=screenSize.width; int height=screenSize.height; int x=(width-WIDTH)/2; int y=(height-HEIGHT)/2; frame.setSize(WIDTH,HEIGHT); frame.setLocation(x,y); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); frame.pack(); GridBagLayout layout=new GridBagLayout(); pane.setLayout(layout); GridBagConstraints constraints=new GridBagConstraints(); constraints.fill=GridBagConstraints.NONE; constraints.anchor=GridBagConstraints.EAST; constraints.weightx=4; constraints.weighty=3; JButton button1=new JButton("运行后台计数器一"); JButton button2=new JButton("运行后台计数器二"); JButton button3=new JButton("临时结果操作一"); JButton button4=new JButton("临时结果操作二"); text1=new JTextField(10); add(button1,constraints,1,0,1,1); add(button3,constraints,0,1,1,1); add(text1,constraints,2,1,1,1); add(button2,constraints,1,2,1,1); add(button4,constraints,0,3,1,1); button1.addActionListener (//将计数工作放入工作线程,然后执行它 new ActionListener() { public void actionPerformed(ActionEvent e) { (wor1 = new worker()).execute(); } } ); button2.addActionListener (//将计数工作放入工作线程,然后执行它 new ActionListener() { public void actionPerformed(ActionEvent Event) { (wor2 = new worker()).execute(); } } ); button3.addActionListener (//当单击此按钮时,后台计数会停止,并且会将目前的数据显示在文本组件中。 new ActionListener() { public void actionPerformed(ActionEvent Event) { wor1.cancel(true); wor1 = null; } } ); button4.addActionListener (//当单击此按钮时,后台计数会停止,并且会将目前的数据显示在文本组件中。 new ActionListener() { public void actionPerformed(ActionEvent Event) { wor2.cancel(true); wor2 = null; } } ); } private static class counter {//创建一个内部类,使用其构造器赋值 private final int sum; counter(int sum) { this.sum=sum; } } private class worker extends SwingWorker<Void, counter> {//创建一个worker类,这个类继承SwingWorker类,所以要实现doInBackground()和process()方法。这个方法主要是实现一个计数功能 protected Void doInBackground() { int sum = 0; while (!isCancelled()) { sum++; } publish(new counter(sum)); //使用publish()方法将中间数据储存起来 return null; } protected void process(List<counter> count) {//这个方法主要是将中间数据从publish()方法中提取出来,在放入到事件分发线程中去显示 counter cou = count.get(count.size() - 1); text1.setText(String.format("%d", cou.sum)); } } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new threadtest(); } }); } }
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