JFileChooser fileChooser = new JFileChooser(); fileChooser.addChoosableFileFilter(new yourfilter()); //自己写个filter类
import java.io.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.filechooser.*;public class FileChooserDemo extends JFrame { static private final String newline = "\n"; public FileChooserDemo() { super("FileChooserDemo"); //Create the log first, because the action listeners //need to refer to it. final JTextArea log = new JTextArea(5,20); log.setMargin(new Insets(5,5,5,5)); log.setEditable(false); JScrollPane logScrollPane = new JScrollPane(log); //Create a file chooser final JFileChooser fc = new JFileChooser(); //Create the open button ImageIcon openIcon = new ImageIcon("images/open.gif"); JButton openButton = new JButton("Open a File...", openIcon); openButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int returnVal = fc.showOpenDialog(FileChooserDemo.this); if (returnVal == JFileChooser.APPROVE_OPTION) { File file = fc.getSelectedFile(); //this is where a real application would open the file. log.append("Opening: " + file.getName() + "." + newline); } else { log.append("Open command cancelled by user." + newline); } } }); //Create the save button ImageIcon saveIcon = new ImageIcon("images/save.gif"); JButton saveButton = new JButton("Save a File...", saveIcon); saveButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int returnVal = fc.showSaveDialog(FileChooserDemo.this); if (returnVal == JFileChooser.APPROVE_OPTION) { File file = fc.getSelectedFile(); //this is where a real application would save the file. log.append("Saving: " + file.getName() + "." + newline); } else { log.append("Save command cancelled by user." + newline); } } }); //For layout purposes, put the buttons in a separate panel JPanel buttonPanel = new JPanel(); buttonPanel.add(openButton); buttonPanel.add(saveButton); //Explicitly set the focus sequence. openButton.setNextFocusableComponent(saveButton); saveButton.setNextFocusableComponent(openButton); //Add the buttons and the log to the frame Container contentPane = getContentPane(); contentPane.add(buttonPanel, BorderLayout.NORTH); contentPane.add(logScrollPane, BorderLayout.CENTER); } public static void main(String[] args) { JFrame frame = new FileChooserDemo(); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); frame.pack(); frame.setVisible(true); } }
fileChooser.addChoosableFileFilter(new yourfilter()); //自己写个filter类
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.*;public class FileChooserDemo extends JFrame {
static private final String newline = "\n"; public FileChooserDemo() {
super("FileChooserDemo"); //Create the log first, because the action listeners
//need to refer to it.
final JTextArea log = new JTextArea(5,20);
log.setMargin(new Insets(5,5,5,5));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log); //Create a file chooser
final JFileChooser fc = new JFileChooser(); //Create the open button
ImageIcon openIcon = new ImageIcon("images/open.gif");
JButton openButton = new JButton("Open a File...", openIcon);
openButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int returnVal = fc.showOpenDialog(FileChooserDemo.this); if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//this is where a real application would open the file.
log.append("Opening: " + file.getName() + "." + newline);
} else {
log.append("Open command cancelled by user." + newline);
}
}
}); //Create the save button
ImageIcon saveIcon = new ImageIcon("images/save.gif");
JButton saveButton = new JButton("Save a File...", saveIcon);
saveButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int returnVal = fc.showSaveDialog(FileChooserDemo.this); if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//this is where a real application would save the file.
log.append("Saving: " + file.getName() + "." + newline);
} else {
log.append("Save command cancelled by user." + newline);
}
}
}); //For layout purposes, put the buttons in a separate panel
JPanel buttonPanel = new JPanel();
buttonPanel.add(openButton);
buttonPanel.add(saveButton); //Explicitly set the focus sequence.
openButton.setNextFocusableComponent(saveButton);
saveButton.setNextFocusableComponent(openButton); //Add the buttons and the log to the frame
Container contentPane = getContentPane();
contentPane.add(buttonPanel, BorderLayout.NORTH);
contentPane.add(logScrollPane, BorderLayout.CENTER);
} public static void main(String[] args) {
JFrame frame = new FileChooserDemo(); frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}); frame.pack();
frame.setVisible(true);
}
}
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
class opendisk extends JFrame implements ActionListener
{
opendisk()
{
super("open disk");
JPanel pane=new JPanel();
JButton open=new JButton("open");
open.addActionListener(this);
open.setActionCommand("open");
pane.add(open);
setContentPane(pane);
show();
}
public static void main(String argu[])
{
opendisk od=new opendisk();
od.pack();
}
public void actionPerformed(ActionEvent evt)
{
String cmd=evt.getActionCommand();
if(cmd=="open")
{
JFileChooser JFileChooser1 = new JFileChooser("D:\\");//启动一个文件选择器
if(JFileChooser1.APPROVE_OPTION==JFileChooser1.showOpenDialog(this))//如果文件选择完毕
{
openFile(JFileChooser1.getSelectedFile().getPath());//作为将来的接口
String filepath=JFileChooser1.getSelectedFile().getPath();//获取被选择文件的路径
System.out.println(filepath);//输出文件路径
}
}
}
void openFile(String fileName)
{
try
{
File file=new File(fileName);
int size =(int)file.length();
int chars_read=0;
FileReader in=new FileReader(file);
char[] data=new char[size];
while(in.ready())
{
chars_read+=in.read(data,chars_read,size-chars_read);
//read(目标数组、文件起始位置、文件结束位置)
//返回读入的数据量
}
in.close();
}
catch(IOException e)
{
System.out.println(e.toString());
}
}}