学步园

当我们在JFrame中存在多个JProcessBar，每个按钮事件启动一个JProcessBar,当单击某个按钮的时候，运行其中一个进度条，往往位出现程序等待的情况，利用多线程技术可以很好的解决这些问题。。。

利用内部类来访问外部类的属性，

具体代码如下

 /*<br /> * To change this template, choose Tools | Templates<br /> * and open the template in the editor.<br /> */</p> <p>/*<br /> * NewJFrame1.java<br /> *<br /> * Created on 2009-7-28, 17:41:31<br /> */</p> <p>package desktopapplication1.resources;</p> <p>import java.util.logging.Level;<br /> import java.util.logging.Logger;</p> <p>/**<br /> *<br /> * @author Administrator<br /> */<br /> public class NewJFrame1 extends javax.swing.JFrame{</p> <p> /** Creates new form NewJFrame1 */<br /> public NewJFrame1() {<br /> initComponents();<br /> }</p> <p> /** This method is called from within the constructor to<br /> * initialize the form.<br /> * WARNING: Do NOT modify this code. The content of this method is<br /> * always regenerated by the Form Editor.<br /> */<br /> @SuppressWarnings("unchecked")<br /> // <editor-fold defaultstate="collapsed" desc="Generated Code"><br /> private void initComponents() {</p> <p> jButton1 = new javax.swing.JButton();<br /> jButton2 = new javax.swing.JButton();<br /> jTextField1 = new javax.swing.JTextField();<br /> jProgressBar1 = new javax.swing.JProgressBar();<br /> jProgressBar2 = new javax.swing.JProgressBar();<br /> jButton3 = new javax.swing.JButton();</p> <p> setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);</p> <p> jButton1.setText("jButton1");<br /> jButton1.setName("jButton1"); // NOI18N<br /> jButton1.addActionListener(new java.awt.event.ActionListener() {<br /> public void actionPerformed(java.awt.event.ActionEvent evt) {<br /> jButton1ActionPerformed(evt);<br /> }<br /> });</p> <p> jButton2.setText("jButton2");<br /> jButton2.setName("jButton2"); // NOI18N</p> <p> jTextField1.setText("jTextField1");<br /> jTextField1.setName("jTextField1"); // NOI18N<br /> jTextField1.addActionListener(new java.awt.event.ActionListener() {<br /> public void actionPerformed(java.awt.event.ActionEvent evt) {<br /> jTextField1ActionPerformed(evt);<br /> }<br /> });<br /> jTextField1.addKeyListener(new java.awt.event.KeyAdapter() {<br /> public void keyPressed(java.awt.event.KeyEvent evt) {<br /> ab(evt);<br /> }<br /> });</p> <p> jProgressBar1.setName("jProgressBar1"); // NOI18N<br /> jProgressBar1.addPropertyChangeListener(new java.beans.PropertyChangeListener() {<br /> public void propertyChange(java.beans.PropertyChangeEvent evt) {<br /> jProgressBar1PropertyChange(evt);<br /> }<br /> });</p> <p> jProgressBar2.setName("jProgressBar2"); // NOI18N</p> <p> jButton3.setText("jButton3");<br /> jButton3.setName("jButton3"); // NOI18N<br /> jButton3.addActionListener(new java.awt.event.ActionListener() {<br /> public void actionPerformed(java.awt.event.ActionEvent evt) {<br /> jButton3ActionPerformed(evt);<br /> }<br /> });</p> <p> javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());<br /> getContentPane().setLayout(layout);<br /> layout.setHorizontalGroup(<br /> layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)<br /> .addGroup(layout.createSequentialGroup()<br /> .addContainerGap(59, Short.MAX_VALUE)<br /> .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)<br /> .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)<br /> .addGroup(layout.createSequentialGroup()<br /> .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)<br /> .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)<br /> .addComponent(jProgressBar2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)<br /> .addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))<br /> .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)))<br /> .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)<br /> .addGroup(layout.createSequentialGroup()<br /> .addGap(60, 60, 60)<br /> .addComponent(jButton2)<br /> .addGap(54, 54, 54))<br /> .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()<br /> .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)<br /> .addComponent(jButton1)<br /> .addGap(33, 33, 33))<br /> .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()<br /> .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)<br /> .addComponent(jButton3)<br /> .addGap(46, 46, 46))))<br /> );<br /> layout.setVerticalGroup(<br /> layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)<br /> .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()<br /> .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)<br /> .addGroup(layout.createSequentialGroup()<br /> .addGap(34, 34, 34)<br /> .addComponent(jButton2))<br /> .addGroup(layout.createSequentialGroup()<br /> .addGap(45, 45, 45)<br /> .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))<br /> .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 65, Short.MAX_VALUE)<br /> .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)<br /> .addComponent(jButton1)<br /> .addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, 19, javax.swing.GroupLayout.PREFERRED_SIZE))<br /> .addGap(36, 36, 36)<br /> .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)<br /> .addComponent(jProgressBar2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)<br /> .addComponent(jButton3))<br /> .addGap(87, 87, 87))<br /> );</p> <p> pack();<br /> }// </editor-fold><br /> int leng=0;</p> <p> boolean a=false;</p> <p> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {<br /> // TODO add your handling code here: </p> <p> ProcessBar1 t=new ProcessBar1(this);<br /> t.start();<br /> jProgressBar1.setVisible(true);<br /> this.jButton1.setEnabled(false);<br /> } </p> <p> private void ab(java.awt.event.KeyEvent evt) {<br /> System.out.println(evt.getKeyChar());<br /> // TODO add your handling code here:<br /> } </p> <p> private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {<br /> // TODO add your handling code here:<br /> } </p> <p> private void jProgressBar1PropertyChange(java.beans.PropertyChangeEvent evt) {<br /> // TODO add your handling code here:<br /> javax.swing.JProgressBar bar = (javax.swing.JProgressBar)evt.getSource();</p> <p> } </p> <p> private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {<br /> // TODO add your handling code here:<br /> ProcessBar2 p = new ProcessBar2(this);<br /> p.start();</p> <p> }<br /> class ProcessBar2 extends Thread<br /> {</p> <p> javax.swing.JFrame j =null;<br /> ProcessBar2(javax.swing.JFrame jframe)<br /> {<br /> j = jframe;<br /> }<br /> @Override<br /> public void run() {<br /> int i=0;<br /> while(true){<br /> try {<br /> while(true)<br /> {</p> <p> jProgressBar2.setValue(DB.getComplete(4, DB.getCon()));<br /> java.lang.Thread.sleep(2000);<br /> if(jProgressBar2.getPercentComplete()==1.0)<br /> {<br /> System.out.println("Complete");<br /> jProgressBar2.setVisible(false);<br /> javax.swing.JOptionPane.showMessageDialog(j,"UserID=1" , "Rejudge Sucess", javax.swing.JOptionPane.INFORMATION_MESSAGE);<br /> break;<br /> }<br /> int a = (int) (jProgressBar2.getPercentComplete() * 100);<br /> jButton3.setText("完成"+a+"%");<br /> }<br /> jButton3.setText("Rejudge");<br /> jButton3.setEnabled(true);<br /> jProgressBar2.setVisible(false);</p> <p> break;<br /> } catch (InterruptedException ex) {<br /> Logger.getLogger(NewJFrame1.class.getName()).log(Level.SEVERE, null, ex);<br /> }<br /> }</p> <p> }</p> <p>}<br /> /**<br /> * @param args the command line arguments<br /> */<br /> public static void main() {<br /> java.awt.EventQueue.invokeLater(new Runnable() {<br /> public void run() {<br /> NewJFrame1 nej = new NewJFrame1();<br /> nej.jProgressBar1.setVisible(false);<br /> nej.setVisible(true);<br /> }<br /> });<br /> }</p> <p> // Variables declaration - do not modify<br /> private javax.swing.JButton jButton1;<br /> private javax.swing.JButton jButton2;<br /> private javax.swing.JButton jButton3;<br /> private javax.swing.JProgressBar jProgressBar1;<br /> private javax.swing.JProgressBar jProgressBar2;<br /> private javax.swing.JTextField jTextField1;<br /> // End of variables declaration<br /> //定义内部类，ProcessBar,@para JFrame<br /> class ProcessBar1 extends Thread<br /> {<br /> javax.swing.JFrame j =null;<br /> ProcessBar1(javax.swing.JFrame jframe)<br /> {<br /> j = jframe;<br /> }<br /> @Override<br /> public void run() {<br /> int i=0;<br /> while(true){<br /> try {<br /> while(true)<br /> {</p> <p> jProgressBar1.setValue(DB.getComplete(9, DB.getCon()));<br /> java.lang.Thread.sleep(2000);<br /> if(jProgressBar1.getPercentComplete()==1.0)<br /> {<br /> System.out.println("Complete");<br /> jProgressBar1.setVisible(false);<br /> javax.swing.JOptionPane.showMessageDialog(j,"UserID=1" , "Rejudge Sucess", javax.swing.JOptionPane.INFORMATION_MESSAGE);<br /> break;<br /> }<br /> int a = (int) (jProgressBar1.getPercentComplete() * 100);<br /> jButton1.setText("完成"+a+"%");<br /> }<br /> jButton1.setText("Rejudge");<br /> jButton1.setEnabled(true);<br /> jProgressBar1.setVisible(false);<br /> System.out.println(i);<br /> break;<br /> } catch (InterruptedException ex) {<br /> Logger.getLogger(NewJFrame1.class.getName()).log(Level.SEVERE, null, ex);<br /> }<br /> }</p> <p> }<br /> }</p> <p>}<br />