java – 是否可以在JFileChooser窗口中选择文件名？
发布时间：2020-12-15 02:17:02 所属栏目：Java 来源：网络整理
导读：我可以使用以下命令在JFileChooser窗口中设置默认文件名： fileChooser.setSelectedFile(); 我想知道是否也可以选择它,所以如果你想将文件另存为其他东西,你可以立即开始改写它.感谢您的帮助. package filetest;import java.awt.event.*;import java.io.File
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我可以使用以下命令在JFileChooser窗口中设置默认文件名：
fileChooser.setSelectedFile(); 我想知道是否也可以选择它,所以如果你想将文件另存为其他东西,你可以立即开始改写它.感谢您的帮助. package filetest;
import java.awt.event.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.UnsupportedEncodingException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
@SuppressWarnings("serial")
class Editor {
public static class TextClass extends JTextArea {
FileClass fileClass = new FileClass();
public void setKeyboardShortcuts() {
fileClass.setKeyboardShortcuts();
}
private class FileClass {
private File directory;
private String filepath = "";
private String filename = "";
private void setKeyboardShortcuts() {
Action ctrlo = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
try {
openFile();
} catch (UnsupportedEncodingException e1) {
}
}
};
getInputMap().put(KeyStroke.getKeyStroke("ctrl O"),"ctrlo");
getActionMap().put("ctrlo",ctrlo);
Action ctrls = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
try {
saveFile();
} catch (UnsupportedEncodingException e1) {
}
}
};
getInputMap().put(KeyStroke.getKeyStroke("ctrl S"),"ctrls");
getActionMap().put("ctrls",ctrls);
}
private String selectFile(String fileaction) throws FileNotFoundException {
JFileChooser filechooser = new JFileChooser();
if (directory != null) {
filechooser.setCurrentDirectory(directory);
} else {
filechooser.setCurrentDirectory(new File("."));
}
filechooser.setSelectedFile(new File(filepath));
int r = 0;
if (fileaction.equals("openfile"))
r = filechooser.showDialog(new JPanel(),"Open file");
else
r = filechooser.showDialog(new JPanel(),"Save file");
if (r == JFileChooser.APPROVE_OPTION) {
try {
directory = filechooser.getSelectedFile().getParentFile();
filename = filechooser.getSelectedFile().getName();
return filename;
} catch (Exception exception) {
return "";
}
} else {
return "";
}
}
private void openFile() throws UnsupportedEncodingException {
try {
String filestr = selectFile("openfile");
if (filestr.equals(""))
return;
else
filepath = filestr;
} catch (FileNotFoundException ex) {
Logger.getLogger(Editor.class.getName()).log(Level.SEVERE,null,ex);
}
}
private void saveFile() throws UnsupportedEncodingException {
try {
String filestr = selectFile("savefile");
if (filestr.equals(""))
return;
else
filepath = filestr;
} catch (FileNotFoundException ex) {
Logger.getLogger(Editor.class.getName()).log(Level.SEVERE,ex);
}
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Editor.class.getName()).log(java.util.logging.Level.SEVERE,ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Editor.class.getName()).log(java.util.logging.Level.SEVERE,ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Editor.class.getName()).log(java.util.logging.Level.SEVERE,ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Editor.class.getName()).log(java.util.logging.Level.SEVERE,ex);
}
createAndShowGui();
}
});
}
private static void createAndShowGui() {
JFrame frame = new JFrame();
frame.setSize(800,600);
frame.setLocationRelativeTo(null);
JTextArea textArea = new TextClass();
frame.add(textArea);
((TextClass) textArea).setKeyboardShortcuts();
frame.setVisible(true);
}
}
解决方法
它默认在我输入的机器上执行此操作：
package stackoverflow;
import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileNameExtensionFilter;
/**
*
* @author ub
*/
public class StackOverflow
{
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
JFileChooser chooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("Images","jpg","gif","png");
chooser.setFileFilter(filter);
chooser.setSelectedFile(new File("C:UsersubPicturesCapt.PNG"));
int returnVal = chooser.showOpenDialog(null);
if(returnVal == JFileChooser.APPROVE_OPTION)
System.out.println("You chose to open this file: "+chooser.getSelectedFile().getName());
}
}
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