布局上讲：一个Panel展示，一个Panel操作
设计的话，，首先得有图片的路径，可以保存在一个list链表中，点击上一页或下一页，展示图片的JPanel通过list的路径，找到相应的图片，并画出来，，这样就可以了
其他：至于其他的扩展功能，如全屏，旋转等，，都可以一点一点再加，先完成大体的架构功能吧
import java.awt.BorderLayoutimport java.awt.Graphics
import java.awt.GridLayout
import java.awt.event.ActionEvent
import java.awt.event.ActionListener
import java.io.File
import java.util.ArrayList
import javax.swing.ImageIcon
import javax.swing.JButton
import javax.swing.JFileChooser
import javax.swing.JFrame
import javax.swing.JMenu
import javax.swing.JMenuBar
import javax.swing.JMenuItem
import javax.swing.JPanel
public class ImageGallery extends JFrame implements ActionListener {
public static final int G_WIDTH = 400, G_HEIGHT = 620
public static final int L_WIDTH = 1200, L_HEIGHT = 520
public static final int MAX_R = 3, MAX_C = 2
public static final int GRID = 1, LARGE = 2
private JFileChooser chooser
private JMenuBar toolBar
private JMenu menu
private JMenuItem open
private ArrayList<String>paths
private JPanel showingPanel, buttonPanel
private int page = 1
private int count = 0
private int showType = GRID
private int pageMax
private JButton last, next, large, grid
public ImageGallery() {
this.setTitle("Image gallery 0.1")
this.setBounds(100, 100, G_WIDTH, G_HEIGHT)
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
toolBar = new JMenuBar()
chooser = new JFileChooser()
chooser.setCurrentDirectory(new java.io.File("."))
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY)
menu = new JMenu("File")
toolBar.add(menu)
open = new JMenuItem("open")
open.addActionListener(this)
menu.add(open)
paths = new ArrayList<String>()
this.setJMenuBar(toolBar)
showingPanel = new JPanel()
buttonPanel = new JPanel()
last = new JButton("last")
last.addActionListener(this)
next = new JButton("next")
next.addActionListener(this)
large = new JButton("large")
large.addActionListener(this)
grid = new JButton("grid")
grid.addActionListener(this)
buttonPanel.add(last)
buttonPanel.add(large)
buttonPanel.add(grid)
buttonPanel.add(next)
this.add(buttonPanel, BorderLayout.SOUTH)
this.add(showingPanel)
this.setVisible(true)
}
public void doOpen() {
int result = chooser.showOpenDialog(null)
if (result == JFileChooser.APPROVE_OPTION) {
String directory = chooser.getSelectedFile().getPath()
this.getAllImage(directory)
for (String s : this.paths) {
System.out.println(s)
}
this.showingImage()
}
}
public void getAllImage(String directory) {
paths.clear()
page = 1
count = 0
File file = new File(directory)
if (file.isDirectory()) {
String[] list = file.list()
for (String s : list) {
String path = directory + "\\" + s
File temp = new File(path)
if (!temp.isDirectory()) {
this.paths.add(path)
}
}
}
}
public void changePage(int page) {
if (!paths.isEmpty()) {
switch (showType) {
case GRID:
this.page += page
if (this.page == 0) {
this.page = 1
}
if (this.page >pageMax) {
this.page = pageMax
}
break
case LARGE:
this.count += page
if (count <0) {
count = 0
}
if (count >paths.size() - 1) {
count = paths.size() - 1
}
break
}
this.showingImage()
}
}
public void showingImage() {
this.remove(showingPanel)
showingPanel = new JPanel()
int size = paths.size()
int max = MAX_R * MAX_C
pageMax = (size % max == 0 ? size / max : size / max + 1)
switch (showType) {
case GRID:
this.setBounds(100, 100, G_WIDTH, G_HEIGHT)
showingPanel.setLayout(new GridLayout(MAX_R, MAX_C - 1))
int i = (page - 1) * max
int j = page * max
for (i <j &&i <sizei++) {
String path = paths.get(i)
showingPanel.add(new ImagePanel(path))
}
break
case LARGE:
int left = count - 1
int right = count + 1
this.setBounds(100, 100, L_WIDTH, L_HEIGHT)
showingPanel.setLayout(new GridLayout(1, 2))
if (left >= 0) {
showingPanel.add(new ImagePanel(paths.get(left)))
} else {
showingPanel.add(new ImagePanel(""))
}
showingPanel.add(new ImagePanel(paths.get(count)))
if (right <size) {
showingPanel.add(new ImagePanel(paths.get(right)))
} else {
showingPanel.add(new ImagePanel(""))
}
break
}
this.add(showingPanel, BorderLayout.CENTER)
showingPanel.updateUI()
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new ImageGallery()
}
class ImagePanel extends JPanel {
private ImageIcon image
ImagePanel(String path) {
image = new ImageIcon(path)
}
public ImageIcon getImageIcon() {
return this.image
}
@Override
protected void paintComponent(Graphics g) {
// TODO Auto-generated method stub
g.drawImage(image.getImage(), 0, 0, this.getWidth(), this
.getHeight(), this)
}
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String key = e.getActionCommand()
System.out.println(key)
if (key.equals("open")) {
doOpen()
} else if (key.endsWith("last")) {
changePage(-1)
} else if (key.endsWith("next")) {
changePage(1)
} else if (key.endsWith("large")) {
if (!paths.isEmpty()) {
count =0
showType = LARGE
showingImage()
}
} else if (key.endsWith("grid")) {
if (!paths.isEmpty()) {
page = 1
showType = GRID
showingImage()
}
}
}
}
自定义一个jpanel用于展示image
/***
*/
package org.demo
import java.awt.Graphics
import java.awt.Graphics2D
import java.awt.Image
import java.util.HashMap
import java.util.Map
import javax.swing.JPanel
/**
* @ClassName: ImageView
* @Description: TODO(这里用一句话描述这个类的作用)
* @author Btboy1978
* @date 2017年6月12日 下午9:46:13 *
*/
public class ImageView extends JPanel {
private Map<Integer, Image> images
private int currentIndex
public ImageView() {
super()
images = new HashMap<Integer, Image>()
currentIndex = 0
}
/*
* (non-Javadoc)
*
* @see javax.swing.JComponent#paint(java.awt.Graphics)
*/
@Override
public void paint(Graphics g) {
g.clearRect(0, 0, WIDTH, HEIGHT)
Graphics2D g2 = (Graphics2D) g
g2.drawImage(images.get(currentIndex), 0, 0, this)
}
public void showNext() {
if (images.size() != 0) {
if (currentIndex != images.size() - 1) {
currentIndex++
}
}
this.repaint()
}
public void showUp() {
if (images.size() != 0) {
if (currentIndex != 0) {
currentIndex--
}
}
this.repaint()
}
public void addImage(Image image){
images.put(images.size(), image)
System.out.println(images.size())
}
}
测试方法
/***
*/
package org.demo
import java.awt.BorderLayout
import java.awt.EventQueue
import javax.swing.JFrame
import javax.swing.JPanel
import javax.swing.border.EmptyBorder
import javax.imageio.ImageIO
import javax.swing.JButton
import java.awt.event.ActionListener
import java.io.File
import java.io.IOException
import java.awt.event.ActionEvent
/**
* @ClassName: ImageViewTest
* @Description: TODO(这里用一句话描述这个类的作用)
* @author Btboy1978
* @date 2017年6月12日 下午9:59:42 *
*/
public class ImageViewTest extends JFrame {
private JPanel contentPane
private ImageView imageView
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
ImageViewTest frame = new ImageViewTest()
frame.setVisible(true)
} catch (Exception e) {
e.printStackTrace()
}
}
})
}
/**
* Create the frame.
*/
public ImageViewTest() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
setBounds(100, 100, 450, 393)
contentPane = new JPanel()
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5))
setContentPane(contentPane)
contentPane.setLayout(null)
imageView = new ImageView()
imageView.setBounds(10, 10, 414, 284)
try {
imageView.addImage(ImageIO.read(new File("images/1.jpg")))
imageView.addImage(ImageIO.read(new File("images/2.jpg")))
imageView.addImage(ImageIO.read(new File("images/3.jpg")))
imageView.addImage(ImageIO.read(new File("images/4.jpg")))
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace()
}
contentPane.add(imageView)
JButton btnNewButton = new JButton("UP")
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
imageView.showUp()
}
})
btnNewButton.setBounds(81, 304, 117, 41)
contentPane.add(btnNewButton)
JButton button = new JButton("NEXT")
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
imageView.showNext()
}
})
button.setBounds(228, 304, 117, 41)
contentPane.add(button)
}
}
