java进度条

Java进度条(一)

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。

下面给出代码：

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();
}
}