文件作为存储数据的单元，会根据数据类型产生很多分类，也就是所谓的文件类型。在对数据文件进行操作时，常常需要根据不同的文件类型来作不同的处理。本实例实现的是读取文件夹指定类型的文件并显示到表格控件中。这对于项目开发中的文件分类起到了抛砖引玉的作用。
思路分析：
代码如下：
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import java.awt.BorderLayout;import java.awt.EventQueue;import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import java.awt.Insets;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.File;import java.sql.Date;import
javax.swing.JButton;import
javax.swing.JFileChooser;import
javax.swing.JFrame;import
javax.swing.JLabel;import
javax.swing.JPanel;import
javax.swing.JScrollPane;import
javax.swing.JTable;import
javax.swing.JTextField;import
javax.swing.border.EmptyBorder;import
javax.swing.event.CaretEvent;import
javax.swing.event.CaretListener;import
javax.swing.table.DefaultTableModel;public
class ListCustomTypeFile extends
JFrame { /** * */ private
static final long serialVersionUID = -6263975104443132420L; /** * 自定义扩展名过滤器 * * @author 李钟尉 */ private
final class CustomFilter implements
java.io.FileFilter { @Override public
boolean accept(File pathname) { // 获取用户设置的指定扩展名 String extName = extNameField.getText(); if
(extName == null
|| extName.isEmpty()) return
false; if
(!extName.startsWith("."))// 判断扩展名前缀 extName = "."
+ extName;// 完事扩展名前缀 extName = extName.toLowerCase(); // 判断扩展名与过滤文件名是否符合要求 if
(pathname.getName().toLowerCase().endsWith(extName)) return
true; return
false; } } private
JPanel contentPane; private
JTextField extNameField; private
JTable table; private
File dir; private
JLabel label; /** * Launch the application. */ public
static void main(String[] args) { EventQueue.invokeLater(new
Runnable() { public
void run() { try
{ ListCustomTypeFile frame = new
ListCustomTypeFile(); frame.setVisible(true); } catch
(Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public
ListCustomTypeFile() { setTitle("显示指定类型的文件"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new
JPanel(); contentPane.setBorder(new
EmptyBorder(5, 5, 5, 5)); contentPane.setLayout(new
BorderLayout(0, 0)); setContentPane(contentPane); JPanel panel = new
JPanel(); contentPane.add(panel, BorderLayout.NORTH); GridBagLayout gbl_panel = new
GridBagLayout(); gbl_panel.columnWidths = new
int[] { 93, 54, 0
}; gbl_panel.rowHeights = new
int[] { 23, 0, 0
}; gbl_panel.columnWeights = new
double[] { 0.0, 1.0, Double.MIN_VALUE }; gbl_panel.rowWeights = new
double[] { 0.0, 0.0, Double.MIN_VALUE }; panel.setLayout(gbl_panel); JButton button = new
JButton("选择文件夹"); button.addActionListener(new
ActionListener() { public
void actionPerformed(ActionEvent e) { do_button_actionPerformed(e); } }); GridBagConstraints gbc_button = new
GridBagConstraints(); gbc_button.anchor = GridBagConstraints.NORTH; gbc_button.gridx = 0; gbc_button.gridy = 0; panel.add(button, gbc_button); label = new
JLabel("文件夹"); GridBagConstraints gbc_label = new
GridBagConstraints(); gbc_label.fill = GridBagConstraints.HORIZONTAL; gbc_label.gridx = 1; gbc_label.gridy = 0; panel.add(label, gbc_label); JLabel label_1 = new
JLabel("输入指定文件扩展名称："); GridBagConstraints gbc_label_1 = new
GridBagConstraints(); gbc_label_1.anchor = GridBagConstraints.EAST; gbc_label_1.insets = new
Insets(0, 0, 0, 5); gbc_label_1.gridx = 0; gbc_label_1.gridy = 1; panel.add(label_1, gbc_label_1); extNameField = new
JTextField(); extNameField.addCaretListener(new
CaretListener() { public
void caretUpdate(CaretEvent e) { do_extNameField_caretUpdate(e); } }); extNameField.setText(".gif"); GridBagConstraints gbc_extNameField = new
GridBagConstraints(); gbc_extNameField.insets = new
Insets(0, 0, 5, 0); gbc_extNameField.fill = GridBagConstraints.HORIZONTAL; gbc_extNameField.gridx = 1; gbc_extNameField.gridy = 1; panel.add(extNameField, gbc_extNameField); extNameField.setColumns(10); JScrollPane scrollPane = new
JScrollPane(); contentPane.add(scrollPane, BorderLayout.CENTER); table = new
JTable(); table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); table.setModel(new
DefaultTableModel(new
Object[][] {}, new
String[] {"文件名称", "文件大小","修改日期"
}) { /** * */ private
static final long serialVersionUID = 5274214559103654856L; boolean[] columnEditables = new
boolean[] { false, false, false
}; public
boolean isCellEditable(int
row, int
column) { return
columnEditables[column]; } }); table.getColumnModel().getColumn(0).setPreferredWidth(220); table.getColumnModel().getColumn(1).setPreferredWidth(85); table.getColumnModel().getColumn(2).setPreferredWidth(110); scrollPane.setViewportView(table); } /** * 选择文件夹按钮的事件处理方法 * * @param e */ protected
void do_button_actionPerformed(ActionEvent e) { JFileChooser chooser = new
JFileChooser();// 创建文件选择器 // 设置选择器的过滤器 chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); chooser.showDialog(this, null); dir = chooser.getSelectedFile(); getLabel().setText(dir.toString()); // 获取过滤后的符合条件的文件数组 listFiles(); } /** * 显示文件夹中的文件 */ private
void listFiles() { if
(dir == null) return; // 获取符合条件的文件数组 File[] files = dir.listFiles(new
CustomFilter()); // 获取表格的数据模型 DefaultTableModel model = (DefaultTableModel) table.getModel(); model.setRowCount(0); for
(File file : files) {// 遍历文件数组 // 创建表格行数据 Object[] row = { file.getName(), file.length(), new
Date(file.lastModified()) }; model.addRow(row);// 添加行数据到表格模型 } } protected
void do_extNameField_caretUpdate(CaretEvent e) { listFiles(); } protected
JLabel getLabel() { return
label; }} |
效果如图：
原文：http://www.cnblogs.com/cysolo/p/3570424.html