「java的进度条」java如何实现进度条
本篇文章给大家谈谈java的进度条，以及java如何实现进度条对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。
本文目录一览：
JAVA怎么自己绘制进度条样式
package com.test;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Dimension;
import java.net.URL;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.JWindow;
/**
* 程序启动模拟进度条
* 配置操作：
* 1、更换url的test图片。图片的路径和.java文件一级
* 2、showFrame里，new出下一个JFrame
* 3、main方法里的new可以带到上一个JFrame
* @author Administrator
*
*/
public class ProgrammStart extends JWindow implements Runnable {
Thread splashThread; //进度条更新线程
JProgressBar progress; //进度条
public ProgrammStart() {
Container container=getContentPane(); //得到容器
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)); //设置光标
URL url = getClass().getResource("test.jpg"); //图片的位置
if(url != null){
container.add(new JLabel(new ImageIcon(url)),BorderLayout.CENTER); //增加图片
}
progress = new JProgressBar(1,100); //实例化进度条
progress.setStringPainted(true); //描绘文字
progress.setString("程序加载中,请稍候......"); //设置显示文字
progress.setBackground(Color.white); //设置背景色
container.add(progress,BorderLayout.SOUTH); //增加进度条到容器上
Dimension screen = getToolkit().getScreenSize(); //得到屏幕尺寸
pack(); //窗口适应组件尺寸
setLocation((screen.width-getSize().width)/2,(screen.height-getSize().height)/2); //设置窗口位置
}
public void start(){
this.toFront(); //窗口前端显示
splashThread=new Thread(this); //实例化线程
splashThread.start(); //开始运行线程
}
public void run(){
setVisible(true); //显示窗口
try {
for (int i=0;i100;i++){
Thread.sleep(100); //线程休眠
progress.setValue(progress.getValue()+1); //设置进度条值
}
}
catch (Exception ex) {
ex.printStackTrace();
}
dispose(); //释放窗口
showFrame(); //运行主程序
}
static void showFrame(){
//实例化JFrame对象
}
public static void main(String[] args) {
new ProgrammStart().start();
}
}
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
java实现进度条
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
public class Test extends JFrame {
public Test(){
super();
setSize(100,100);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
JProgressBar progressBar = new JProgressBar();
getContentPane().add(progressBar,BorderLayout.NORTH);
progressBar.setStringPainted(true);
for (int i = 0;i 50;i++){
progressBar.setValue(i);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
new Test();
}
}
for循环里面加了个延时函数。
关于Java中进度条的问题
import java.awt.BorderLayout;
import java.awt.Cursor;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;
public class Bar extends JFrame implements PropertyChangeListener
{
private static final long serialVersionUID = 1L;
private JProgressBar progressBar;
private JButton copy;
private Task task;
public Bar(String title)
{
setTitle(title);
setLayout(new BorderLayout());
progressBar = new JProgressBar(0, 100);
progressBar.setValue(0);
progressBar.setStringPainted(true);
add(progressBar, BorderLayout.CENTER);
copy = new JButton("拷贝");
copy.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
start();
copy.setEnabled(false);
}
});
add(copy, BorderLayout.EAST);
}
class Task extends SwingWorkerVoid, Void
{
@Override
public Void doInBackground()
{
setProgress(0);
File file = new File("aa.mp3");
long size = file.length();
byte[] bts = new byte[1024 * 10];
int length = 0;
long cLength = 0;
try
{
InputStream stream = new FileInputStream(file);
OutputStream os = new FileOutputStream(new File("a.mp3"));
while((length = stream.read(bts)) 0)
{
os.write(bts, 0, length);
cLength += length;
setProgress((int) (cLength * 100 / size));
Thread.sleep(100);
}
os.close();
stream.close();
}
catch(Exception e1)
{
e1.printStackTrace();
}
return null;
}
@Override
public void done()
{
setTitle("拷贝完毕");
Toolkit.getDefaultToolkit().beep();
copy.setEnabled(true);
setCursor(null);
}
}
public void propertyChange(PropertyChangeEvent evt)
{
if("progress" == evt.getPropertyName())
{
int progress = (Integer) evt.getNewValue();
progressBar.setValue(progress);
}
}
private void start()
{
task = new Task();
task.addPropertyChangeListener(this);
task.execute();
setTitle("正在拷贝...");
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
}
private static void createAndShowGUI()
{
Bar frame = new Bar("Bar");
frame.setAlwaysOnTop(true);
frame.setSize(280, 60);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public static void main(String[] args)
{
javax.swing.SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}
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中如何实现进度条效果
代码如下：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(); } } 效果图：
java的进度条的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java如何实现进度条、java的进度条的信息别忘了在本站进行查找喔。
发布于：2022-12-04，除非注明，否则均为原创文章，转载请注明出处。