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java进度条,java进度条显示百分比

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Java中如何实现进度条效果

import java.awt.Color; import java.awt.Toolkit; import javax.swing.ImageIcon; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JProgressBar; import javax.swing.JWindow; @SuppressWarnings("serial") public class Demo extends JWindow implements Runnable { // 定义加载窗口大小 public static final int LOAD_WIDTH = 455; public static final int LOAD_HEIGHT = 295; // 获取屏幕窗口大小 public static final int WIDTH = Toolkit.getDefaultToolkit().getScreenSize().width; public static final int HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().height; // 定义进度条组件 public JProgressBar progressbar; // 定义标签组件 public JLabel label; // 构造函数 public Demo() { // 创建标签,并在标签上放置一张图片 label = new JLabel(new ImageIcon("images/background.jpg")); label.setBounds(0, 0, LOAD_WIDTH, LOAD_HEIGHT - 15); // 创建进度条 progressbar = new JProgressBar(); // 显示当前进度值信息 progressbar.setStringPainted(true); // 设置进度条边框不显示 progressbar.setBorderPainted(false); // 设置进度条的前景色 progressbar.setForeground(new Color(0, 210, 40)); // 设置进度条的背景色 progressbar.setBackground(new Color(188, 190, 194)); progressbar.setBounds(0, LOAD_HEIGHT - 15, LOAD_WIDTH, 15); // 添加组件 this.add(label); this.add(progressbar); // 设置布局为空 this.setLayout(null); // 设置窗口初始位置 this.setLocation((WIDTH - LOAD_WIDTH) / 2, (HEIGHT - LOAD_HEIGHT) / 2); // 设置窗口大小 this.setSize(LOAD_WIDTH, LOAD_HEIGHT); // 设置窗口显示 this.setVisible(true); } public static void main(String[] args) { Demo t = new Demo(); new Thread(t).start(); } @Override public void run() { for (int i = 0; i 100; i++) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } progressbar.setValue(i); } JOptionPane.showMessageDialog(this, "加载完成"); this.dispose(); } }

JAVA 进度条

直接上官方示例

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.beans.*;

import java.util.Random;

 

public class ProgressBarDemo extends JPanel

                             implements ActionListener,

                                        PropertyChangeListener {

 

    private JProgressBar progressBar;

    private JButton startButton;

    private JTextArea taskOutput;

    private Task task;

 

    class Task extends SwingWorkerVoid, Void {

        /*

         * Main task. Executed in background thread.

         */

        @Override

        public Void doInBackground() {

            Random random = new Random();

            int progress = 0;

            //Initialize progress property.

            setProgress(0);

            while (progress  100) {

                //Sleep for up to one second.

                try {

                    Thread.sleep(random.nextInt(1000));

                } catch (InterruptedException ignore) {}

                //Make random progress.

                progress += random.nextInt(10);

                setProgress(Math.min(progress, 100));

            }

            return null;

        }

 

        /*

         * Executed in event dispatching thread

         */

        @Override

        public void done() {

            Toolkit.getDefaultToolkit().beep();

            startButton.setEnabled(true);

            setCursor(null); //turn off the wait cursor

            taskOutput.append("Done!\n");

        }

    }

 

    public ProgressBarDemo() {

        super(new BorderLayout());

 

        //Create the demo's UI.

        startButton = new JButton("Start");

        startButton.setActionCommand("start");

        startButton.addActionListener(this);

 

        progressBar = new JProgressBar(0, 100);

        progressBar.setValue(0);

        progressBar.setStringPainted(true);

 

        taskOutput = new JTextArea(5, 20);

        taskOutput.setMargin(new Insets(5,5,5,5));

        taskOutput.setEditable(false);

 

        JPanel panel = new JPanel();

        panel.add(startButton);

        panel.add(progressBar);

 

        add(panel, BorderLayout.PAGE_START);

        add(new JScrollPane(taskOutput), BorderLayout.CENTER);

        setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));

 

    }

 

    /**

     * Invoked when the user presses the start button.

     */

    public void actionPerformed(ActionEvent evt) {

        startButton.setEnabled(false);

        setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));

        //Instances of javax.swing.SwingWorker are not reusuable, so

        //we create new instances as needed.

        task = new Task();

        task.addPropertyChangeListener(this);

        task.execute();

    }

 

    /**

     * Invoked when task's progress property changes.

     */

    public void propertyChange(PropertyChangeEvent evt) {

        if ("progress" == evt.getPropertyName()) {

            int progress = (Integer) evt.getNewValue();

            progressBar.setValue(progress);

            taskOutput.append(String.format(

                    "Completed %d%% of task.\n", task.getProgress()));

        }

    }

 

 

    /**

     * Create the GUI and show it. As with all GUI code, this must run

     * on the event-dispatching thread.

     */

    private static void createAndShowGUI() {

        //Create and set up the window.

        JFrame frame = new JFrame("ProgressBarDemo");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 

        //Create and set up the content pane.

        JComponent newContentPane = new ProgressBarDemo();

        newContentPane.setOpaque(true); //content panes must be opaque

        frame.setContentPane(newContentPane);

 

        //Display the window.

        frame.pack();

        frame.setVisible(true);

    }

 

    public static void main(String[] args) {

        //Schedule a job for the event-dispatching thread:

        //creating and showing this application's GUI.

        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {

                createAndShowGUI();

            }

        });

    }

}

java 做进度条 进度数据获取

实现这个功能比较简单,用到的类有两个:ProgressMonitorInputStream(主要是整个类) 和 ProgressMonitor ,在javax.swing中整个文件的大小,和当前已经读取文件的大小,获得整个文件大小的方法

代码如下:

ProgressMonitorInputStream monitor;

/**

* @param 表示此进度条要依附在哪个组件上

* @param 显示在此进度条上的消息

* @param 需要监控的输入流

*/

monitor = new ProgressMonitorInputStream(null, "Loading ",new FileInputStream("filename path"));

int all = monitor.available();//整个文件的大小

int in = monitor.read(data);//每次读取文件的大小

例如:你每次读一行str=in.readLine();则data=str.instr.getBytes()+1;这里+1,主要是为了获得换行符的字节数,否则,最后获得的进步无法达到100%

代码如下:

int readed=0;//表示已经读取的文件

reader+=in;//累加读取文件大小

计算进度:

代码如下:

float process = (float) readed / all * 100;// 算出百分比

窗口显示:

代码如下:

progressMonitor.setNote("archived " + process + " %");// 显示在进度条上

用 java 怎么做进度条?

import java.awt.Canvas;

import java.awt.Color;

import java.awt.Graphics;

public class MyProgressBar extends Canvas {

private float scaleSize;

private float currentValue;

public MyProgressBar() {

this(100, 50);

}

public MyProgressBar(float scaleSize, float currentValue) {

this.scaleSize = scaleSize;

this.currentValue = currentValue;

this.setBackground(Color.lightGray);

this.setForeground(Color.magenta);

setSize(150, 25);

}

public float getCurrentValue() {

return currentValue;

}

public void setCurrentValue(float currentValue) {

this.currentValue = Math.max(0, currentValue);

if (this.scaleSize this.currentValue) {

this.currentValue = this.scaleSize;

}

}

public float getScaleSize() {

return scaleSize;

}

public void setScaleSize(float scaleSize) {

this.scaleSize = Math.max(1.0f, scaleSize);

if (this.scaleSize this.currentValue) {

this.scaleSize = this.currentValue;

}

}

public synchronized void paint(Graphics g) {

int w = getSize().width;

int h = getSize().height;

g.setColor(getBackground());

g.fillRect(1, 1, w - 2, h - 2);

g.fill3DRect(0, 0, w - 1, h - 1, true);

g.setColor(getForeground());

g.fillRect(3, 3, (int) (currentValue * (w - 6) / scaleSize), h - 6);

}

}

下面是程序执行入口点:

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

public class TestMyProgressBar extends JFrame implements Runnable,

ActionListener {

private MyProgressBar bar;

private JButton btnStart;

static TestMyProgressBar tmpb;

public TestMyProgressBar() {

setSize(400, 300);

setLocation(400, 400);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setTitle("演示自定义进度条");

setLayout(new FlowLayout());

btnStart = new JButton("开始");

this.add(btnStart);

btnStart.addActionListener(this);

bar = new MyProgressBar();

setVisible(true);

}

public static void main(String[] args) {

tmpb = new TestMyProgressBar();

}

@Override

public void run() {

for (int i = 1; i = 20; i++) {

int x = i * 5;

bar.setCurrentValue(x);

if (x 0 x 100) {

btnStart.setEnabled(false);

}

if (x == 100) {

btnStart.setEnabled(true);

}

try {

Thread.sleep(200);

add(bar);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

@Override

public void actionPerformed(ActionEvent e) {

if (e.getActionCommand().equals("开始")) {

Thread t = new Thread(tmpb);

t.start();

}

}

}

java多线程导出如何更新进度条

1:一个子进程进行计算

2:计算过程中返回计算的百分比,比如10%,20%。。。。。100%;

3:前端需要一个定时器不断请求进度,然后更新进度条。

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