本案例通过使用JFileChooser实现对选定文件夹内图片实现自动播放和暂停播放
代码如下，如有不合适的地方 还请指教
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package com.xiaoqiang;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.util.Timer;
import java.util.TimerTask;
/**
* 本例通过JFileChooser选择文件夹
* 对文件夹内图片进行滚动播放 用到TimerTask以及ActionListener
* 详细解释JFileChooser使用及图片滚动过程需要的思维
* @author xiaoqiang
* @timer 2017年4月27日
*/
public class PlayPicture extends JFrame implements ActionListener{
private File fileDirectory;
private JFileChooser fileChooser;
private Container con;
private JButton nextPic;
private JButton previousPic;
private JButton showPic;
private JButton beginPlayPic;
private JButton stopPlayPic;
private JLabel picIcon;
private String[] fileName;
private String parentPath;
private static boolean play;
private static PlayPicture playPicture;
private int i=-1;
private PlayPicture(){
super("图片自动播放器");
this.draw();
}
/**
* 获取单例类
* 用于TimerTask执行时调用同一对象
* @return Object
*/
public static Object getInstance(){
if(playPicture==null)
playPicture=new PlayPicture();
return playPicture;
}
/**
* 画图方法 将GUI画出来
* 因为练习图片滚动和JFileChooser
* 所以GUI比较难看
*/
public void draw(){
con=this.getContentPane();
con.setLayout(new FlowLayout());
showPic=new JButton("请选择目录");
con.add(showPic);
showPic.addActionListener(this);
picIcon=new JLabel("请选择目录展示图片");
con.add(picIcon);
previousPic=new JButton("上一张");
con.add(previousPic);
previousPic.addActionListener(this);
nextPic=new JButton("下一张");
con.add(nextPic);
nextPic.addActionListener(this);
beginPlayPic=new JButton("开始自动播放");
stopPlayPic=new JButton("停止自动播放");
con.add(beginPlayPic);
con.add(stopPlayPic);
beginPlayPic.addActionListener(this);
stopPlayPic.addActionListener(this);
this.setLocation(550, 200);
this.setSize(900,700);
this.setVisible(true);
}
/**
* 执行自动播放效果
* 注意使用的单例类
* 暂停的话设置单例类静态变量
* play为false
*/
public void automatic(){
TimerTask task = new TimerTask() {
@Override
public void run() {
((PlayPicture) PlayPicture.getInstance()).NextPicture();
if(!((PlayPicture)PlayPicture.getInstance()).play){
((PlayPicture) PlayPicture.getInstance()).previousPicture();
}
}
};
Timer timer = new Timer();
long delay = 0;
//intevalPeriod为秒数
long intevalPeriod = 5 * 1000;
timer.scheduleAtFixedRate(task, delay, intevalPeriod);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource().equals(showPic)){
//设置G盘为默认打开路径
fileChooser=new JFileChooser(new File("G:"));
/*
* 设置可以选择文件夹，默认为只允许选择文件
*
* DIRECTORIES_ONLY 指示仅显示目录。
* FILES_AND_DIRECTORIES 指示显示文件和目录
* FILES_ONLY 指示仅显示文件。(默认)
*
*/
fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
//把JFileChooser释放
fileChooser.showOpenDialog(this);
fileDirectory=fileChooser.getSelectedFile();
i=-1;//每次打开都将i重置 方便播放文件
parentPath=fileDirectory.getAbsolutePath();
fileName=fileDirectory.list();
if(hasPicture()){
this.NextPicture();
setBottonEnabled(true);
}else{
picIcon.setText("该目录没有图片哦");
picIcon.setIcon(null);
setBottonEnabled(false);
}
}else if(e.getSource().equals(nextPic)){
this.NextPicture();
}else if(e.getSource().equals(previousPic)){
this.previousPicture();
}else if(e.getSource().equals(beginPlayPic)){
this.automatic();
play=true;
}else if(e.getSource().equals(stopPlayPic)){
play=false;
}
}
//设置按钮不可用
private void setBottonEnabled(boolean available){
nextPic.setEnabled(available);
previousPic.setEnabled(available);
beginPlayPic.setEnabled(available);
stopPlayPic.setEnabled(available);
}
//判断所选路径是否有图片
private boolean hasPicture(){
for(String s:fileName){
if(s.matches("(?i).*(.jpg|.png|.gif|.bpm|.jpeg)$"))
return true;
}
return false;
}
private void previousPicture(){
if(i==0){
i=fileName.length-1;
}
while(!fileName[--i].matches("(?i).*(.jpg|.png|.gif|.bpm|.jpeg)$")){
if(i==-1){
i=fileName.length;
}
}
System.out.println(i);
picIcon.setIcon(new ImageIcon(parentPath+"\\\\"+fileName[i]));
picIcon.setText("");
}
private void NextPicture() {
if(i==fileName.length-1){
i=0;
}
while(!fileName[++i].matches("(?i).*(.jpg|.png|.gif|.bpm|.jpeg)$")){
if(i==fileName.length-1){
i=-1;
}
}
System.out.println(i);
picIcon.setIcon(new ImageIcon(parentPath+"\\\\"+fileName[i]));
picIcon.setText("");
}
public static void main(String[] args) {
//获取实例调用构造方法
PlayPicture.getInstance();
}
}
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以上所述是小编给大家介绍的JFileChooser实现对选定文件夹内图片自动播放和暂停播放实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对快网idc网站的支持！
原文链接：http://blog.csdn.net/crpxnmmafq/article/details/70876399
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