转自：点击打开链接

进度条用在很多的地方，比如登录验证等待过程、程序加载、数据下载、数据更新与删除等，它可以一目了然的让用户知道程序执行的进度。下面给大家看一个登录验证的进度条，首先上效果图：

在代码中未连接数据库，只是模拟这个效果，实际操作中大家可以调用这个进度条，并控制进度条显示与提示消息。

import java.awt.Dialog;
import java.awt.Frame;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;public class ProgressBar implements ActionListener{private static final String DEFAULT_STATUS = "Please Waiting";private JDialog dialog;private JProgressBar progressBar;private JLabel lbStatus;private JButton btnCancel;private Window parent;  private Thread thread;  							//处理业务的线程 private String statusInfo; private String resultInfo; private String cancelInfo;public ProgressBar(){Thread thread = new Thread(){public void run(){int index = 0;while(index < 5){try{sleep(1000);  ++index;}catch(InterruptedException e){e.printStackTrace();}}}};ProgressBar.show((Frame)null, thread, "正在登陆系统,请稍候……", "登陆成功", "登陆失败，请查看数据库是否连接！");        }public static void show(Window parent, Thread thread){new ProgressBar(parent, thread, DEFAULT_STATUS, null, null);}public static void show(Window parent, Thread thread, String statusInfo){new ProgressBar(parent, thread, statusInfo, null, null);}public static void show(Window parent, Thread thread, String statusInfo,String resultInfo, String cancelInfo){new ProgressBar(parent, thread, statusInfo, resultInfo, cancelInfo);}private ProgressBar(Window parent, Thread thread, String statusInfo,String resultInfo, String cancelInfo){this.parent = parent;this.thread = thread;this.statusInfo = statusInfo;this.resultInfo = resultInfo;this.cancelInfo = cancelInfo;initUI();startThread();dialog.setVisible(true);}private void initUI(){if(parent instanceof Dialog){dialog = new JDialog((Dialog)parent,  true);}else if(parent instanceof Frame){dialog = new JDialog((Frame)parent,  true);}else{dialog = new JDialog((Frame)null,  true);}final JPanel mainPane = new JPanel(null);progressBar = new JProgressBar();lbStatus = new JLabel("" + statusInfo);btnCancel = new JButton("Cancel");progressBar.setIndeterminate(true);btnCancel.addActionListener(this);mainPane.add(progressBar);mainPane.add(lbStatus);dialog.getContentPane().add(mainPane);dialog.setUndecorated(true);//除去titledialog.setResizable(true);dialog.setSize(390, 100);dialog.setLocationRelativeTo(parent); 						//设置此窗口相对于指定组件的位置dialog.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE); 			// 不允许关闭mainPane.addComponentListener(new ComponentAdapter(){public void componentResized(ComponentEvent e){layout(mainPane.getWidth(), mainPane.getHeight());}});}private void startThread(){new Thread(){public void run(){try{thread.start(); 							// 处理耗时任务// 等待事务处理线程结束thread.join();}catch(InterruptedException e){e.printStackTrace();}finally{// 关闭进度提示框dialog.dispose();if(resultInfo != null && !resultInfo.trim().equals("")){String title = "消息";JOptionPane.showMessageDialog(parent, resultInfo, title,JOptionPane.INFORMATION_MESSAGE);}}}}.start();}private void layout(int width, int height){progressBar.setBounds(20, 20, 350, 15);lbStatus.setBounds(20, 50, 350, 25);btnCancel.setBounds(width - 85, height - 31, 75, 21);}@SuppressWarnings("deprecation")public void actionPerformed(ActionEvent e){resultInfo = cancelInfo;thread.stop();}  public static void main(String[] args) throws Exception{new ProgressBar();}
}