package ioStream;import java.awt.AWTEvent;import java.awt.Color;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.Toolkit;import java.awt.event.AWTEventListener;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.MouseWheelEvent;import java.awt.event.MouseWheelListener;import java.awt.geom.AffineTransform;import java.io.File;import java.util.LinkedList;import java.util.List;import javax.swing.ImageIcon;import javax.swing.JFileChooser;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.Timer;import javax.swing.UIManager;import javax.swing.filechooser.FileNameExtensionFilter;/** 该代码意在实现照片查看器的功能* 当按下“右箭头”时浏览下一张图片* 当按下“左箭头"时浏览上一张图片* 实现循环浏览* 当按下"Ecs"时推出全屏浏览模式* 当按下CTRL+“上箭头”时，全屏显示* 只能浏览指定文件夹下面的所支持格式的图片（gif,jpg,png）*链表的大小与他的最大角标相隔1*/public class PicsViewer {static JFrame frame0;//原始的全屏显示的窗口static int SWidth=Toolkit.getDefaultToolkit().getScreenSize().width;static int SHeight=Toolkit.getDefaultToolkit().getScreenSize().height;static Image icon=(new ImageIcon("PicsViewer/img.png")).getImage();//框架图标JFileChooser chooser; //声明一个文件选择器对象static JPanel imgjp;static Image img0=(new ImageIcon("image/cat.png")).getImage();//默认的一张图片File files;static int j=0;static int k=0;static File root;static int i=0;Timer T00;String[] Str;//获取文件名字符串static Image img;static int xCoor,yCoor;//打印图片的左上角坐标static int PWidth,PHeight;//图片的宽高(小于屏幕宽高的时候的)static int PWidth0,PHeight0;//图片宽高大于屏幕宽高的时候的图片宽高String CPath;//直接获得的路径String newPath;//经过转换后的路径static List<Image> list=new LinkedList<Image>();int index=0;static int index0=0;static double xCoor0=1,yCoor0=1;//图片在X轴缩放的倍数，图片在Y轴的缩放倍数；static boolean isFull=true;//是否全屏显示static int now;//当前正在使用的图片public PicsViewer(){frame0=new JFrame();imgjp=new ImgsPanel();imgjp.setBackground(new Color(51,51,51));frame0.add(imgjp);frame0.setTitle("PicsViewer1.0");frame0.setSize(SWidth,SHeight);frame0.setUndecorated(isFull);frame0.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//不设置窗口的位置，是因为窗口默认的位置就是在桌面的左上角frame0.setIconImage(icon);//设置窗口图标frame0.setVisible(true);/** 程序一启动就弹出文件选择对话框让用户选择所要浏览的图片*/try {UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");//设置为当前操作系统的外观JFileChooser chooser = new JFileChooser();chooser.setDialogTitle("请选择要查看的图片");chooser.addChoosableFileFilter(new FileNameExtensionFilter("常见图片格式", "jpg", "gif", "png"));chooser.showOpenDialog(frame0);int returnVal = chooser.showOpenDialog(frame0);if(returnVal == JFileChooser.APPROVE_OPTION) {img=(new ImageIcon(chooser.getSelectedFile().toString())).getImage();CPath=chooser.getCurrentDirectory().toString()+System.getProperty("file.separator");newPath=CPath.replaceAll("\\\\","/");//路径转换root=new File(newPath);img0=img;imgjp.repaint();findImage(root);}} catch (Exception evt) {}Toolkit toolkit = Toolkit.getDefaultToolkit();toolkit.addAWTEventListener(new ShortcutKeyListener(), AWTEvent.KEY_EVENT_MASK | AWTEvent.MOUSE_EVENT_MASK| AWTEvent.WINDOW_EVENT_MASK);/*添加键盘监听事件，当点击键盘上的方向键右键时浏览下一张图片，点击左箭头浏览上一张，当按下上箭头时对当前图片进行放大操作* 当按下下箭头时，对当前浏览的图片进行缩小操作* 同时添加鼠标滚轮监听事件，也对当前图片进行缩放操作**/imgjp.addMouseWheelListener(new MouseWheelListener(){public void mouseWheelMoved(MouseWheelEvent e){if(e.getWheelRotation()<0){//如果鼠标滚轮向上滚动，则放大图片}else{//否则缩小图片}}});}public void findImage(File dir){File[] files=dir.listFiles();//得到当前路径下的所有文件和文件夹for(int i=0; i<files.length; i++){Str=new String[files.length];Str[i]=files[i].getAbsolutePath();//将路径和文件名存入字符串数组//使用链表替代数组if(Str[i].endsWith(".jpg")||Str[i].endsWith(".gif")||Str[i].endsWith(".png")==true){list.add(index,(new ImageIcon(Str[i])).getImage());index++;}}}//画图的算法有点问题？？？？static class ImgsPanel extends JPanel{private static final long serialVersionUID = 1L;public void paintComponent(Graphics g){super.paintComponent(g);Graphics2D G2=(Graphics2D)g;AffineTransform Trans=new AffineTransform();PWidth=img0.getWidth(null);PHeight=img0.getHeight(null);if(PWidth<=SWidth&&PHeight<=SHeight){xCoor=(SWidth-PWidth)/2;yCoor=(SHeight-PHeight)/2;PWidth0=PWidth;PHeight0=PHeight;Trans.scale(xCoor0,yCoor0);//对图片的缩放操作// G2.setTransform(Trans);}if(PWidth>SWidth||PHeight>SHeight){yCoor0=SHeight/(PHeight*1.0);PHeight0=SHeight;PWidth0=(int)(PWidth*yCoor0);xCoor0=yCoor0;xCoor=(SWidth-PWidth0)/2;yCoor=-(PHeight0-SHeight)/2;Trans.scale(xCoor0,yCoor0);//对图片的缩放操作// G2.setTransform(Trans);}G2.drawImage(img0,xCoor,yCoor,PWidth0,PHeight0,this);}}static class Tim implements ActionListener{public void actionPerformed(ActionEvent e){//看来变量最好不要用相同的变量名img0=(Image)(list.get(index0));index0++;if(index0==list.size()){index0=0;img0=(Image)(list.get(index0));index0++;imgjp.repaint();}imgjp.repaint();}}static class ShortcutKeyListener implements AWTEventListener { public void eventDispatched(AWTEvent e) {if (e.getClass() == KeyEvent.class) {// 被处理的事件是键盘事件.KeyEvent keyEvent = (KeyEvent) e;if (keyEvent.getID() == KeyEvent.KEY_PRESSED) {keyPressed(keyEvent);} else if (keyEvent.getID() == KeyEvent.KEY_RELEASED) {keyReleased(keyEvent);}}}/** 当只有一张图片是抛出异常，不能使用左右方向键，待解决*/private void keyPressed(KeyEvent e) {switch(e.getKeyCode()){case KeyEvent.VK_RIGHT: if(list.size()!=1){img0=(Image)(list.get(index0));now=index0;index0++;if(index0==list.size()-1){index0=0;img0=(Image)(list.get(index0));now=index0;index0++;imgjp.repaint();}imgjp.repaint();}else{img0=(Image)(list.get(index0));imgjp.repaint();}break;case KeyEvent.VK_LEFT:if(list.size()!=1){if(index0>0){img0=(Image)(list.get(index0));now=index0;index0--;imgjp.repaint();}if(index0<0){index0=list.size()-1;img0=(Image)(list.get(index0));now=index0;index0--;imgjp.repaint();}}else{index0=list.size()-1;img0=(Image)(list.get(index0));now=index0;index0--;imgjp.repaint();}break;case KeyEvent.VK_ESCAPE:isFull=false;frame0=new JFrame();imgjp=new ImgsPanel();imgjp.setBackground(new Color(51,51,51));frame0.add(imgjp);frame0.setTitle("PicsViewer1.0");frame0.setSize(SWidth,SHeight);frame0.setUndecorated(isFull);frame0.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame0.setIconImage(icon);//设置窗口图标frame0.setVisible(true);break;}if ((e.isControlDown() == true)&& (e.getKeyCode() == KeyEvent.VK_UP)) { isFull=true;frame0=new JFrame();imgjp=new ImgsPanel();imgjp.setBackground(new Color(51,51,51));frame0.add(imgjp);frame0.setTitle("PicsViewer1.0");frame0.setSize(SWidth,SHeight);frame0.setUndecorated(isFull);frame0.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame0.setIconImage(icon);frame0.setVisible(true);}}private void keyReleased(KeyEvent event) {}}public static void main(String[] args){new PicsViewer();}}。