我有一个带有编辑按钮的jtable，当我选择一行并单击编辑按钮并编辑字段，然后单击以保存按钮，该行不会更新，并且我必须刷新我的表以更改行！
我的代码：
if (e.getSource() == editButton) {
selectedRow = uTable.getSelectedRow();
if (selectedRow >= 0) {
editUser(selectedRow);
} else {
JOptionPane.showMessageDialog(null, "Select a row");
}
}
public void editUser(int row) {
UserInformation userInf = userModel.getSelectedMember(row);
NewUserFrame_Edit edit = new NewUserFrame_Edit(userInf, row);
}
...
我的NewUserFrame_Edit类：
public class NewUserFrame_Edit extends javax.swing.JFrame {
private AllUser userModel;
private int selectedrow;
private String gender;
public NewUserFrame_Edit(AllUser userModel,UserInformation userinf, int row) {
...
this.userModel = userModel;
jTextField1.setText(userinf.getFname().toString().trim());
jTextField2.setText(userinf.getLname().toString().trim());
if (userinf.getGender().equals("Male")) {
jRadioButton1.setSelected(true);
} else {
jRadioButton2.setSelected(true);
}
jTextField3.setText(userinf.getDate());
selectedrow = row;
setVisible(true);
}
private void updateButtonActionPerformed(java.awt.event.ActionEvent evt) {
userinf = new UserInformation();
userinf.setFname(jTextField1.getText());
userinf.setLname(jTextField2.getText());
userinf.setGender(gender);
userinf.setDate(jTextField3.getText());
userModel.setValueAt(userinf.getFname() , selectedrow, 1);
userModel.setValueAt(userinf.getLname() , selectedrow, 2);
userModel.setValueAt(userinf.getGender(), selectedrow , 3);
userModel.setValueAt(userinf.getDate() , selectedrow, 4);
userModel.updateFile(userModel.Udata);
NewUserFrame_Edit.this.dispose();
}
...
}
我的模型类的setValueAt（）和updateFile（）方法：
public class AllUser extends AbstractTableModel {
...
@Override
public void setValueAt(Object value, int rowIndex, int columnIndex) {
UserInformation userInfo = Udata.get(rowIndex);
switch (columnIndex) {
case 0:
userInfo.setID((String) value);
break;
case 1:
userInfo.setFname((String) value);
break;
case 2:
userInfo.setLname((String) value);
break;
case 3:
userInfo.setGender((String) value);
break;
case 4:
userInfo.setDate((String) value);
break;
}
fireTableCellUpdated(rowIndex, columnIndex);
}
public void updateFile(ArrayList<UserInformation> data) {
PrintWriter pw;
try {
pw = new PrintWriter(new FileWriter("AllUserRecords.txt"));
for (UserInformation userinf : data) {
String line = userinf.getID()
+ " " + userinf.getFname()
+ " " + userinf.getLname()
+ " " + userinf.getGender()
+ " " + userinf.getDate();
pw.println(line);
}
pw.close();
} catch (IOException ioe) {
}
}
...
}
当我选择一行并单击编辑按钮时，会打开一个新的jframe，其文本字段将填充旧数据，然后我更新数据并单击以保存按钮。 因此，我的专栏不确定。 我选择整行，而不是单元格！
感谢。
答案 0 :(得分：6)
要更改JTable条目，请使用TableModel#setValueAt。调用fireTableDataChanged是不必要的。这适用于TableModel内部的内部使用。
if (selectedRow >= 0) {
...
userModel.setValueAt(newValue, selectedRow, 0);
// ... more values for columns 1, 2, 3, etc.
} ...
答案 1 :(得分：4)
您可以在updateRow(int index,String[] values)扩展类中创建一个名为AbstractModel的方法，并在其中使用setValueAt（newValue，row，index）为该行的每个单元格设置新值。并且在setValue的重写TableModel方法中写入fireTableCellUpdated（row，col）。
考虑下面给出的代码。查看updateRow课程中的setValueAt和MyModel方法。并观看((MyModel)myModel).updateRow(row,values);//update row课程中的MyMouseAdapter。
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
class TableRowEdit extends JFrame
{
private JTable table;
private JScrollPane jsPane;
private TableModel myModel;
private JPanel dialogPanel;
private JTextField tf[];
private JLabel lbl[];
public void prepareAndShowGUI()
{
myModel = new MyModel();
table = new JTable(myModel);
jsPane = new JScrollPane(table);
table.getColumnModel().getColumn(2).setCellRenderer(new LabelCellRenderer());
table.addMouseListener(new MyMouseAdapter());
getContentPane().add(jsPane);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
prepareDialogPanel();
pack();
setVisible(true);
}
private void prepareDialogPanel()
{
dialogPanel = new JPanel();
int col = table.getColumnCount() - 1;
dialogPanel.setLayout(new GridLayout(col,2));
tf = new JTextField[col];
lbl = new JLabel[col];
for (int i = 0; i < col; i++)
{
lbl[i] = new JLabel(table.getColumnName(i));
tf[i] = new JTextField(10);
dialogPanel.add(lbl[i]);
dialogPanel.add(tf[i]);
}
}
private void populateTextField(String[] s)
{
for (int i = 0 ; i < s.length ; i++ )
{
tf[i].setText(s[i]);
}
}
public class LabelCellRenderer extends DefaultTableCellRenderer
{
public Component getTableCellRendererComponent(JTable table,Object oValue, boolean isSelected, boolean hasFocus, int row, int column)
{
Component c = super.getTableCellRendererComponent(table, oValue,isSelected, hasFocus,row, column);
String value = (String)oValue;
JLabel label =(JLabel)c;
label.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
label.setBackground(Color.lightGray);
label.setHorizontalTextPosition(SwingUtilities.CENTER);
label.setHorizontalAlignment(SwingUtilities.CENTER);
label.setText(value);
return label;
}
}
private class MyMouseAdapter extends MouseAdapter
{
@Override
public void mousePressed(MouseEvent evt)
{
int x = evt.getX();
int y = evt.getY();
int row = table.rowAtPoint(new Point(x,y));
int col = table.columnAtPoint(new Point(x,y));
if (col == 2)
{
String arr[] = new String[table.getColumnCount() - 1];
for (int i = 0 ; i < arr.length ; i++)
{
arr[i] = (String)table.getValueAt(row,i);
}
populateTextField(arr);
JOptionPane.showMessageDialog(TableRowEdit.this,dialogPanel,"Information",JOptionPane.INFORMATION_MESSAGE);
String[] values = new String[tf.length];
for (int i = 0 ; i < tf.length ; i++)
{
values[i] = tf[i].getText();
}
((MyModel)myModel).updateRow(row,values);//update row
}
}
}
private class MyModel extends AbstractTableModel
{
String[] columns = {
"Roll No.",
"Name",
"Action"
};
String[][] inData = {
{"1","Anthony Hopkins","Edit"},
{"2","James William","Edit"},
{"3","Mc. Donald","Edit"}
};
@Override
public void setValueAt(Object value, int row, int col)
{
inData[row][col] = (String)value;
fireTableCellUpdated(row,col);
}
@Override
public Object getValueAt(int row, int col)
{
return inData[row][col];
}
@Override
public int getColumnCount()
{
return columns.length;
}
@Override
public int getRowCount()
{
return inData.length;
}
@Override
public String getColumnName(int col)
{
return columns[col];
}
@Override
public boolean isCellEditable(int row ,int col)
{
return true;
}
//This method updates the Row of table
public void updateRow(int index,String[] values)
{
for (int i = 0 ; i < values.length ; i++)
{
setValueAt(values[i],index,i);
}
}
}
public static void main(String st[])
{
SwingUtilities.invokeLater( new Runnable()
{
@Override
public void run()
{
TableRowEdit td = new TableRowEdit();
td.prepareAndShowGUI();
}
});
}
}
<强>更新
您的原始代码一切都很好。保持最初的代码。唯一的问题是方法userModel = new AllUser();中的行updateButtonActionPerformed。它创建了AllUser的新对象，而不是使用当前的对象。所以你应该从updateButtonActionPerformed中删除这一行。并按如下方式更改NewUserFrame_Edit构造函数：
public NewUserFrame_Edit(AllUser userModel/*Add this parameter*/,UserInformation userinf, int row) {
...
this.userModel = userModel;
jTextField1.setText(userinf.getFname().toString().trim());
jTextField2.setText(userinf.getLname().toString().trim());
if (userinf.getGender().equals("Male")) {
jRadioButton1.setSelected(true);
} else {
jRadioButton2.setSelected(true);
}
jTextField3.setText(userinf.getDate());
selectedrow = row;
setVisible(true);
}
将您的updateButtonActionPerformed更改为：
private void updateButtonActionPerformed(java.awt.event.ActionEvent evt) {
//userModel = new AllUser();//Comment it.
userinf = new UserInformation();
userinf.setFname(jTextField1.getText());
userinf.setLname(jTextField2.getText());
userinf.setGender(gender);
userinf.setDate(jTextField3.getText());
userModel.setValueAt(userinf.getFname() , selectedrow, 1);
userModel.setValueAt(userinf.getLname() , selectedrow, 2);
userModel.setValueAt(userinf.getGender(), selectedrow , 3);
userModel.setValueAt(userinf.getDate() , selectedrow, 4);
userModel.updateFile(userModel.Udata);
NewUserFrame_Edit.this.dispose();
}
更改类editUser(int row)的{{1}}方法，如下所示：
UserPage这是你的public void editUser(int row)
{
UserInformation userInf = userModel.getSelectedMember(row);
NewUserFrame_Edit edit = new NewUserFrame_Edit(userModel,userInf, row);
}
方法：
updateFile答案 2 :(得分：2)
通过JTable实现更改的另一种方法是使用下面的代码模板：
table.getModel().addTableModelListener(new TableModelListener(){
/**
* Called when table has been changed.
*/
@Override
public void tableChanged(TableModelEvent e) {
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel) e.getSource();
String newdata = (String) model.getValueAt(row, column);
model.setValueAt(newdata, row, column);
// do your update with the newdata variable.
}
});
在这里，您可以使用实际事件来获取JTable变量中已更改的单元格的行和列。