Java进度条，

Java进度条，

  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title
        dialog.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();
    }
}