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

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

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();
  }
}

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