文件选择器JFileChooser的创建

package src10; import java.awt.BorderLayout; import java.awt.Container; import java.awt.Dimension; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; 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.JTextArea; public class s01 implements ActionListener { JFrame jf = null; JLabel jl = null; JTextArea jta = null; JFileChooser jfc = null; private Object Finally; public s01() { jf = new JFrame("FileChooser Example"); Container jcp = jf.getContentPane(); jta = new JTextArea(); JScrollPane jsp = new JScrollPane(jta); jsp.setPreferredSize(new Dimension(350, 300)); JPanel jp = new JPanel(); JButton jbt1 = new JButton("新建文件"); JButton jbt2 = new JButton("存储文件"); jbt1.addActionListener(this); jbt2.addActionListener(this); jp.add(jbt1); jp.add(jbt2); jl = new JLabel("", JLabel.CENTER); jfc = new JFileChooser("D:\\"); jcp.add(jl, BorderLayout.NORTH); jcp.add(jsp, BorderLayout.CENTER); jcp.add(jp, BorderLayout.SOUTH); jf.pack(); jf.setVisible(true); jf.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); } public static void main(String[] args) { new s01(); } public void actionPerformed(ActionEvent e) { File file = null; int result; FileInputStream fin = null; FileOutputStream fout = null; if(e.getActionCommand().equals("新建文件")) { jfc.setApproveButtonText("确定"); jfc.setDialogTitle("打开文件"); result = jfc.showOpenDialog(jf); jta.setText(""); if(result==jfc.APPROVE_OPTION) { file = jfc.getSelectedFile(); jl.setText("您选择打开的文件名称为： " + file.getName()); } else if(result==jfc.CANCEL_OPTION) { jl.setText("您没有选择任何文件"); } } if(file!=null) { try { fin = new FileInputStream(file); } catch (FileNotFoundException e1) { jl.setText("File not found"); return; } } int readbyte; try { while((readbyte=fin.read())!=-1) { jta.append(String.valueOf((char)readbyte)); } } catch (IOException e2) { jl.setText("读取文件错误"); } finally { try { if(fin!=null) { fin.close(); } } catch (IOException e3) {} } if(e.getActionCommand().equals("存储文件")) { result = jfc.showSaveDialog(jf); file = null; String fileName; if(result==jfc.APPROVE_OPTION) { file = jfc.getSelectedFile(); jl.setText("您选择存储的文件名称为： " + file.getName()); } else if(result==jfc.CANCEL_OPTION) { jl.setText("您没有选择任何文件"); } } if(file!=null) { try { fout = new FileOutputStream(file); } catch (FileNotFoundException e4) { jl.setText("File not found"); return; } String content = jta.getText(); try { fout.write(content.getBytes()); } catch (IOException e5) { jl.setText("写入文件错误"); } finally { if(fout!=null) { try { fout.close(); } catch (IOException e6) {} } } } } }