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我一直在從csv wheres回讀，我成功地創建了csv。 我面臨的問題是我不能得到如何獲得從csv返回到jTable的值的線索。 我不會從public void fromCsvJava從csv讀取並在jTable上顯示
class FCMS extends JFrame{
String header[] = {"Firstname","Lastname","FCMS ID","Email"};
String data[][];
DefaultTableModel model = new DefaultTableModel(data, header);
JTable table = new JTable(model);
JPanel pane = new JPanel();
JPanel pane_input = new JPanel();
JLabel lbl_firstname = new JLabel(" Firstname");
JLabel lbl_lastname = new JLabel(" Lastname");
JLabel lbl_id = new JLabel(" FCMS ID");
JLabel lbl_email = new JLabel(" Email");
JTextField txt_firstname = new JTextField(10);
JTextField txt_lastname = new JTextField(10);
JTextField txt_id = new JTextField(10);
JTextField txt_email = new JTextField(10);
JButton btn_add = new JButton("Add Entry");
JButton btn_Csv = new JButton("Export to Csv");
JButton btn_load = new JButton("Load From Csv");
public FCMS(){
setSize(200,200);
setPreferredSize(new Dimension(350,300));
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setResizable(true);
setTitle("Flight Crew Management System");
btn_add.setMnemonic(KeyEvent.VK_A);
btn_Csv.setMnemonic(KeyEvent.VK_E);
btn_load.setMnemonic(KeyEvent.VK_L);
pane_input.setLayout(new GridLayout(0,2));
pane_input.add(lbl_firstname);
pane_input.add(txt_firstname);
pane_input.add(lbl_lastname);
pane_input.add(txt_lastname);
pane_input.add(lbl_id);
pane_input.add(txt_id);
pane_input.add(lbl_email);
pane_input.add(txt_email);
pane_input.add(btn_add);
pane_input.add(btn_Csv);
pane_input.add(btn_load);
pane.setLayout(new BorderLayout());
pane.add(pane_input, BorderLayout.NORTH);
pane.add(new JScrollPane(table), BorderLayout.CENTER);
add(pane);
pack();
setVisible(true);
btn_add.addActionListener(new AksyonListener());
btn_Csv.addActionListener(new AksyonListener());
btn_load.addActionListener(new AksyonListener());
txt_email.addActionListener(new AksyonListener());
}
public void toCsv(JTable table, File file){
try{
TableModel model = table.getModel();
FileWriter Csv = new FileWriter(file);
for(int i = 0; i < model.getColumnCount(); i++){
Csv.write(model.getColumnName(i) + ",");
}
Csv.write("\n");
for(int i=0; i< model.getRowCount(); i++) {
for(int j=0; j < model.getColumnCount(); j++) {
Csv.write(model.getValueAt(i,j).toString()+",");
}
Csv.write("\n");
}
Csv.close();
}catch(IOException e){ System.out.println(e); }
}
public void fromCsv(File file){
BufferedReader fileReader = null;
model.setRowCount(0);
try{
//Create the file reader
fileReader = new BufferedReader(new FileReader(file));
//Read the CSV file header to skip it
fileReader.readLine();
int fn = 0;
int ln = 1;
int id = 2;
int email = 3;
String line="";
//Read the file line by line starting from the second line
while ((line = fileReader.readLine()) != null) {
//Get all tokens available in line
String[] tokens = line.split(",");
model.insertRow(model.getRowCount(), new Object[]{Long.parseLong(tokens[fn]), tokens[ln], tokens[id], tokens[email]});
// if (tokens.length > 0) {
// }
}
/* for(int i=0; i< tokens.length; i++) {
for(int j=0; j < tokens.length; j++) {
//Csv.read(model.getValueAt(i,j).toString()+"\t");
model.insertRow(model.getRowCount(), new Object[]{Long.parseLong(tokens[fn]), tokens[ln], tokens[id], tokens[email]});
}
// Csv.read("\n");
}*/
fileReader.close();
}catch (Exception e) {
System.out.println("Error in CsvFileReader !!!");
e.printStackTrace();
}
}
public static void main(String[] args){
new FCMS();
}
class AksyonListener implements ActionListener{
public void actionPerformed(ActionEvent e){
if(e.getSource() == btn_add || e.getSource() == txt_email){
String fn = txt_firstname.getText();
String ln = txt_lastname.getText();
String id = txt_id.getText();
String mail = txt_email.getText();
txt_firstname.setText("");
txt_lastname.setText("");
txt_id.setText("");
txt_email.setText("");
txt_firstname.requestFocus();
model.insertRow(model.getRowCount(), new Object[]{fn, ln, id, mail});
}
else if(e.getSource() == btn_Csv){
JFileChooser fc = new JFileChooser();
int option = fc.showSaveDialog(FCMS.this);
if(option == JFileChooser.APPROVE_OPTION){
String filename = fc.getSelectedFile().getName();
String path = fc.getSelectedFile().getParentFile().getPath();
int len = filename.length();
String ext = "";
String file = "";
if(len > 4){
ext = filename.substring(len-4, len);
}
if(ext.equals(".csv")){
file = path + "\\" + filename;
}else{
file = path + "\\" + filename + ".csv";
}
toCsv(table, new File(file));
}
}
else if(e.getSource() == btn_load){
JFileChooser fc = new JFileChooser();
int option = fc.showOpenDialog(FCMS.this);
if(option == JFileChooser.APPROVE_OPTION){
String filename = fc.getSelectedFile().getName();
String path = fc.getSelectedFile().getParentFile().getPath();
int len = filename.length();
String ext = "";
String file = "";
if(len > 4){
ext = filename.substring(len-4, len);
}
if(ext.equals(".csv")){
file = path + "\\" + filename;
}else{
file = path + "\\" + filename + ".csv";
}
fromCsv(new File(file));
}
}
}
}
}
問題具有預留的任何其他問題得以解決：
try{
//Create the file reader
fileReader = new BufferedReader(new FileReader(file));
//Read the CSV file header to skip it
fileReader.readLine();
int fn = 0;
int ln = 1;
int id = 2;
int email = 3;
String line="";
//Read the file line by line starting from the second line
while ((line = fileReader.readLine()) != null) {
//Get all tokens available in line
String[] tokens = line.split(",");
model.insertRow(model.getRowCount(), new Object[]{(tokens[fn]), tokens[ln], tokens[id], tokens[email]});
// if (tokens.length > 0) {
// }
}
/* for(int i=0; i< tokens.length; i++) {
for(int j=0; j < tokens.length; j++) {
//Csv.read(model.getValueAt(i,j).toString()+"\t");
model.insertRow(model.getRowCount(), new Object[]{Long.parseLong(tokens[fn]), tokens[ln], tokens[id], tokens[email]});
}
// Csv.read("\n");
}*/
fileReader.close();
}
這意味着我應該只在while循環中執行而不使用先前的for循環，並且if（tokens.length> 0）？ –
nvm，我按照你的建議，我解決了它，並刪除Long.parseLong由於數字格式異常，這是很好的去。 –