📄 fileoperator.java
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JMenuItem helpItem = new JMenuItem("帮助");
aboutmenu.add(helpItem);
helpItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (dialog2 == null) //first run
dialog2 = new HelpDialog(AppFrame.this);
dialog2.show();
}
});
JMenuItem aboutItem = new JMenuItem("关于本软件");
aboutmenu.add(aboutItem);
aboutItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (dialog == null) //first run
dialog = new AboutDialog(AppFrame.this);
dialog.show();
}
});
}
}
class ViewFrame extends JFrame {
JTextArea textarea;
String directory;
JFileChooser chooser;
public ViewFrame() {
this(null, null);
}
public ViewFrame(String filename) {
this(null, filename);
}
public ViewFrame(String directory, String filename) {
super("查看文件");
setSize(200, 320);
// 创建一个用来显示文件内容的TextArea区域
textarea = new JTextArea("", 24, 80);
textarea.setFont(new Font("MonoSpaced", Font.PLAIN, 12));
textarea.setEditable(false);
Container contentPane = getContentPane();
contentPane.add("Center", textarea);
// 创建一个包含两个按钮控件的面板
JPanel p = new JPanel();
p.setLayout(new FlowLayout(FlowLayout.RIGHT, 10, 5));
contentPane.add(p, "South");
Font font = new Font("SansSerif", Font.BOLD, 14);
JButton openfile = new JButton("打开文件");
JButton close = new JButton("关闭");
openfile.addActionListener(new OpenAction(this, directory));
openfile.setActionCommand("open");
openfile.setFont(font);
close.addActionListener(new OpenAction(this, directory));
close.setActionCommand("close");
close.setFont(font);
p.add(openfile);
p.add(close);
this.pack();
// 指明目录
if (directory == null) {
File f;
if ((filename != null) && (f = new File(filename)).isAbsolute()) {
directory = f.getParent();
filename = f.getName();
} else
directory = System.getProperty("user.dir");
}
this.directory = directory; // 记住目录
setFile(directory, filename); // 载入并显示文件
}
public void setFile(String directory, String filename) {
if ((filename == null) || (filename.length() == 0))
return;
File f;
FileReader in = null;
// 读取并且显示文件内容 Since we're reading text, we
// 因为是在读取文本，所以使用FileReader，而不使用FileInputStream.
try {
f = new File(directory, filename); // 创建一个file对象
in = new FileReader(f); // 和一个用来读取它的字符流
char[] buffer = new char[4096]; // 每次读取4K字符
int len; // 每次读入的字符数
textarea.setText(""); // 清除文本区域
while ((len = in.read(buffer)) != -1) { // 读取一批字符
String s = new String(buffer, 0, len); // 转化为一个字符串
textarea.append(s); // 显示文本
}
this.setTitle("FileViewer: " + filename); // 设置窗口标题
textarea.setCaretPosition(0); // 设置文件起始位置
}
// 显示错误信息
catch (IOException e) {
textarea.setText(e.getClass().getName() + ": " + e.getMessage());
this.setTitle("FileViewer: " + filename + ": I/O Exception");
}
// 关闭输入流
finally {
try {
if (in != null)
in.close();
} catch (IOException e) {
try {
AppFrame.WriteError(e);
} catch (IOException err) {
}
}
}
}
class OpenAction implements ActionListener {
JFrame frame;
String directory;
public OpenAction(JFrame aframe, String dir) {
frame = aframe;
directory = dir;
}
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
if (cmd.equals("open")) { // 如果用户单击了“打开”按钮
// 创建一个文件对话框，提示输入新的文件
FileDialog f =
new FileDialog(frame, "Open File", FileDialog.LOAD);
f.setDirectory(directory); // 设置默认目录
// 显示对话框并等待用户的输入
f.show();
directory = f.getDirectory(); // 记住新的默认目录
setFile(directory, f.getFile()); // 载入并显示选择
f.dispose(); // 关闭对话框
} else if (cmd.equals("close")) // 如果用户单击了“关闭”按钮
frame.dispose(); //关闭窗口
}
}
}
class AboutDialog extends JDialog {
public AboutDialog(JFrame owner) {
super(owner, "About Dialog", true);
Container contentPane = getContentPane();
//add HTML label to center
contentPane.add(
new JLabel(
"<HTML><H1><I>FileOperator</I></H1><HR>"
+ " Made By Song !<HTML>"),
BorderLayout.CENTER);
JButton ok = new JButton("OK");
ok.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
}
});
JPanel panel = new JPanel();
panel.add(ok);
contentPane.add(panel, BorderLayout.SOUTH);
setSize(250, 150);
}
}
class HelpDialog extends JDialog {
public HelpDialog(JFrame owner) {
super(owner, "Help Dialog", true);
Container contentPane = getContentPane();
//add HTML label to center
contentPane.add(
new JLabel(
"<HTML><H1>本软件可以实现文件的基本删除，复制，压缩和查看等基本操作<HR>" +
"同时也可以对java所支持的图片(.gif,.jpg,.jpeg)查看。欢迎使用：）<</H1><HR>"
+ " Made By Song !<HTML>"),
BorderLayout.CENTER);
JButton ok = new JButton("OK");
ok.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
}
});
JPanel panel = new JPanel();
panel.add(ok);
contentPane.add(panel, BorderLayout.SOUTH);
setSize(500,300);
}
}
class ExtensionFileFilter extends FileFilter {
public void addExtension(String extension) {
if (!extension.startsWith("."))
extension = "." + extension;
extensions.add(extension.toLowerCase());
}
public void setDescription(String aDes) {
description = aDes;
}
public String getDescription() {
return description;
}
public boolean accept(File f) {
if (f.isDirectory())
return true;
String name = f.getName().toLowerCase();
for (int i = 0; i < extensions.size(); i++)
if (name.endsWith((String) extensions.get(i)))
return true;
return false;
}
private String description = "";
private ArrayList extensions = new ArrayList();
}
class FileIconView extends FileView {
private FileFilter filter;
private Icon icon;
public Icon getIcon(File f) {
if (!f.isDirectory() && filter.accept(f))
return icon;
else
return null;
}
}
class ImagePreviewer extends JLabel {
public ImagePreviewer(JFileChooser chooser) {
setPreferredSize(new Dimension(100, 100));
setBorder(BorderFactory.createEtchedBorder());
chooser.addPropertyChangeListener(new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent event) {
if (event.getPropertyName()
== JFileChooser.SELECTED_FILE_CHANGED_PROPERTY) {
File f = (File) event.getNewValue();
ImageIcon icon = new ImageIcon(f.getPath());
if (icon.getIconWidth() > getWidth())
icon =
new ImageIcon(
icon.getImage().getScaledInstance(
getWidth(),
-1,
Image.SCALE_DEFAULT));
setIcon(icon);
}
}
});
}
}
class ImageViewerFrame extends JFrame {
JLabel label;
JFileChooser chooser;
int dWIDTH = 300;
int dHEIGHT = 400;
AboutDialog dialog;
public ImageViewerFrame() {
setTitle("ImageViewer");
setSize(dWIDTH, dHEIGHT);
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu menu = new JMenu("File");
menuBar.add(menu);
JPanel myPanel = new JPanel();
Container contentPane = getContentPane();
contentPane.add(myPanel);
myPanel.setBackground(Color.yellow);
//用一个LABEL来显示图片
label = new JLabel();
myPanel.add(label);
chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));
//accept all image files ending with .jpg .jpeg .gif
final ExtensionFileFilter filter = new ExtensionFileFilter();
filter.addExtension("jpg");
filter.addExtension("jpeg");
filter.addExtension("gif");
filter.setDescription("Image files");
chooser.setFileFilter(filter);
chooser.setAccessory(new ImagePreviewer(chooser));
JMenuItem openItem = new JMenuItem("Open");
menu.add(openItem);
openItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int r = chooser.showOpenDialog(null);
//if file selected,set it as icon of the label
if (r == JFileChooser.APPROVE_OPTION) {
String name = chooser.getSelectedFile().getPath();
ImageIcon im = new ImageIcon(name);
im.getImage().getScaledInstance(
im.getIconWidth() * 2,
im.getIconHeight() * 2,
Image.SCALE_DEFAULT);
label.setIcon(im);
}
}
});
JMenuItem exitItem = new JMenuItem("Exit");
menu.add(exitItem);
exitItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
JMenuItem aboutItem = new JMenuItem("About");
menu.add(aboutItem);
aboutItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (dialog == null) //first run
dialog = new AboutDialog(ImageViewerFrame.this);
dialog.show();
}
});
}
}
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