今天试着写了个Swing，但是JFileChooser始终都报一个错...大虾们帮忙看看..
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class CreateUI{
static String displayTxt = " ";
JTextField tf = null;
public Component createCom(){
JPanel panel = new JPanel();
tf = new JTextField();
tf.setColumns(20);
JButton Fchoose = new JButton( "Choose Directory ");
Fchoose.setMnemonic(KeyEvent.VK_D);
ActionListener chooser = new ActionListener(){
public void actionPerformed(ActionEvent arg0) {
String txt = tf.getText();
JFileChooser jfc = null;
if(txt != null && txt.length()!=0){
File file = new File(txt);
if(!file.exists()){
txt = " ";
}
}else{
txt = " ";
}
if(txt.length() ==0){
try{
jfc = new JFileChooser( "c:\\ ");
}catch(Exception e){
System.out.println( "这儿报错了..... ");
e.printStackTrace();
}
}else{
jfc = new JFileChooser(txt);
}
jfc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
int rtnVal = jfc.showOpenDialog(null);
if(rtnVal == JFileChooser.APPROVE_OPTION){
tf.setText(jfc.getSelectedFile().getAbsolutePath());
}
}
};
Fchoose.addActionListener(chooser);
JButton jb1 = new JButton( "Convert HTM To txt ");
jb1.setMnemonic(KeyEvent.VK_H);
jb1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
boolean flag = true;
String txt = " ";
if(tf.getText() != null && tf.getText().length()!=0){
txt = new String(tf.getText());
File file = new File(txt);
if(!file.exists() || !file.isDirectory()){
flag = false;
}
}
if(flag){
HtmConvert convert = new HtmConvert();
displayTxt = convert.convert(txt);
}
}
});
JButton jb2 = new JButton( "Conver ansi to UTF-8 ");
jb2.setMnemonic(KeyEvent.VK_A);
ActionListener ac1 = new ActionListener(){
public void actionPerformed(ActionEvent arg0) {
boolean flag = true;
String txt = " ";
if(tf.getText() != null && tf.getText().length()!=0){
txt = new String(tf.getText());
File file = new File(txt);