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) {}}}}}}