Java Swing組件JFileChooser用法實(shí)例分析
更新時(shí)間：2017年11月13日 12:15:12 作者：pzy4447
這篇文章主要介紹了Java Swing組件JFileChooser用法,結(jié)合實(shí)例形式分析了java Swing組件JFileChooser文件選擇器的功能、使用方法及相關(guān)注意事項(xiàng),需要的朋友可以參考下
本文實(shí)例講述了Java Swing組件JFileChooser用法。分享給大家供大家參考，具體如下：
JFileChooser文件選擇器是Swing中經(jīng)常用到的一個(gè)控件。它的使用主要包含以下幾個(gè)參數(shù)：
1.當(dāng)前路徑。也就是它第一次打開(kāi)時(shí)所在的路徑，許多軟件喜歡設(shè)置為桌面。
2.文件過(guò)濾器。通過(guò)設(shè)置文件過(guò)濾器，只有特定類型的文件是可見(jiàn)的，比如文本，音頻，等。
3.選擇模式。包含三種情況：僅文件, 僅目錄, 文件或目錄。
4.是否允許多選。
JFileChooser的參數(shù)當(dāng)然不止以上4種，它還有很多高級(jí)選項(xiàng)，比如你可以對(duì)文件的顯示圖標(biāo)進(jìn)行定制等，由于不經(jīng)常用，這里不再介紹。
有2個(gè)地方要注意：
1.文件過(guò)濾器建議使用FileNameExtensionFilter，它是FileFilter的子類，以非常方便的方法實(shí)現(xiàn)了過(guò)濾器。用法見(jiàn)代碼。
2.getSelectedFiles()方法，它只在isMultiSelectionEnable()方法返回true是有效。也就是說(shuō)，如果你不允許多選，則只能使用getSelectedFile()方法，否則只能得到一個(gè)空的文件列表。
下面通過(guò)一個(gè)demo來(lái)展示它的基本用法。
package awtDemo;
import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.filechooser.FileSystemView;
/**
*
* @author pzy
*/
@SuppressWarnings("serial")
public class JFileChooserFrame extends javax.swing.JFrame {
/**
* Creates new form JFileChooserFrame
*/
public JFileChooserFrame() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
fileFilterisBG = new javax.swing.ButtonGroup();
isMultiSelectBG = new javax.swing.ButtonGroup();
jPanel1 = new javax.swing.JPanel();
text_rb = new javax.swing.JRadioButton();
video_rb = new javax.swing.JRadioButton();
audio_rb = new javax.swing.JRadioButton();
all_rb = new javax.swing.JRadioButton();
jPanel2 = new javax.swing.JPanel();
jComboBox1 = new javax.swing.JComboBox();
multiSelect_rb = new javax.swing.JRadioButton();
singleSelect_rb = new javax.swing.JRadioButton();
jPanel3 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setLocationByPlatform(true);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("文件類型"));
fileFilterisBG.add(text_rb);
text_rb.setText("文本");
fileFilterisBG.add(video_rb);
video_rb.setText("視頻");
fileFilterisBG.add(audio_rb);
audio_rb.setText("音頻");
fileFilterisBG.add(all_rb);
all_rb.setSelected(true);
all_rb.setText("所有");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(text_rb)
.addGap(29, 29, 29)
.addComponent(video_rb)
.addGap(35, 35, 35)
.addComponent(audio_rb)
.addGap(39, 39, 39)
.addComponent(all_rb)
.addGap(32, 32, 32))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(video_rb)
.addComponent(text_rb)
.addComponent(audio_rb)
.addComponent(all_rb))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder("選擇模式"));
jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "僅文件", "僅目錄", "文件或目錄" }));
jComboBox1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jComboBox1ActionPerformed(evt);
}
});
isMultiSelectBG.add(multiSelect_rb);
multiSelect_rb.setText("可多選");
isMultiSelectBG.add(singleSelect_rb);
singleSelect_rb.setSelected(true);
singleSelect_rb.setText("不可多選");
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 144, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(multiSelect_rb, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(singleSelect_rb, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(14, Short.MAX_VALUE))
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(multiSelect_rb)
.addComponent(singleSelect_rb))
.addContainerGap(16, Short.MAX_VALUE))
);
jButton1.setText("開(kāi)始");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addGap(117, 117, 117)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 139, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addGap(26, 26, 26)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(19, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(84, 84, 84)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(8, 8, 8)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String itemString = jComboBox1.getSelectedItem().toString();
if ("僅文件".equals(itemString)) {
fileSelectionMode = JFileChooser.FILES_ONLY;
} else if ("僅目錄".equals(itemString)) {
fileSelectionMode = JFileChooser.DIRECTORIES_ONLY;
} else if ("文件或目錄".equals(itemString)) {
fileSelectionMode = JFileChooser.FILES_AND_DIRECTORIES;
}
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
fileChooser = new JFileChooser();
//初始化當(dāng)前路徑
FileSystemView fsv = FileSystemView.getFileSystemView();
File homeFile =fsv.getHomeDirectory(); //這便是讀取桌面路徑的方法了
fileChooser.setCurrentDirectory(homeFile);
//初始化文件過(guò)濾器
if (text_rb.isSelected()) {
filter = new FileNameExtensionFilter("文本文件", "log", "txt");
fileChooser.setFileFilter(filter);
}
if (video_rb.isSelected()) {
filter = new FileNameExtensionFilter("視頻文件", "mp4", "mkv");
fileChooser.setFileFilter(filter);
}
if (audio_rb.isSelected()) {
filter = new FileNameExtensionFilter("音頻文件", "mp3", "wma");
fileChooser.setFileFilter(filter);
}
//初始化選擇模式
fileChooser.setFileSelectionMode(fileSelectionMode);
//是否允許多選
if (multiSelect_rb.isSelected()) {
fileChooser.setMultiSelectionEnabled(true);
}
else if(singleSelect_rb.isSelected()) {
fileChooser.setMultiSelectionEnabled(false);
}
//打開(kāi)文件選擇器
int i = fileChooser.showDialog(this, "選擇");
if(i == JFileChooser.APPROVE_OPTION){
StringBuilder sb;
if(fileChooser.isMultiSelectionEnabled()){
sb = new StringBuilder("您選擇了以下文件：");
File [] files = fileChooser.getSelectedFiles();
for (File file : files) {
sb.append("\n");
sb.append(file.getName());
}
}
else{
File file = fileChooser.getSelectedFile();
sb = new StringBuilder("您選擇的文件是：");
sb.append("\n");
sb.append(file.getName());
}
JOptionPane.showMessageDialog(this, sb);
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
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(JFileChooserFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(JFileChooserFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(JFileChooserFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(JFileChooserFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new JFileChooserFrame().setVisible(true);
}
});
}
private JFileChooser fileChooser;
private FileNameExtensionFilter filter;
private int fileSelectionMode = JFileChooser.FILES_ONLY;
// Variables declaration - do not modify
private javax.swing.JRadioButton all_rb;
private javax.swing.JRadioButton audio_rb;
private javax.swing.ButtonGroup fileFilterisBG;
private javax.swing.ButtonGroup isMultiSelectBG;
private javax.swing.JButton jButton1;
@SuppressWarnings("rawtypes")
private javax.swing.JComboBox jComboBox1;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JRadioButton multiSelect_rb;
private javax.swing.JRadioButton singleSelect_rb;
private javax.swing.JRadioButton text_rb;
private javax.swing.JRadioButton video_rb;
// End of variables declaration
}
運(yùn)行效果如下：
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