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我正在用 Java 编写一个 GUI,并且有一个布局,您可以在其中找到一个 JTable 和两个用于“操作”JTable 的按钮(尽管功能仍然缺失)。每当单击两个按钮之一时,就会出现一个面板,用户可以在其中输入信息,然后在保存数据时单击“保存”按钮。
从可见框架的设计中可以清楚地看出,我希望“添加行”按钮向 JTable 添加新行,而“编辑行”按钮应该更改数据。
如何保存在单击“保存”时打开的新 JDialog 中输入的数据(最好在内存中)。现在,我使用 saveData()
方法和一个名为 lastData
的全局 Object[]
。有更好的方法吗?此外我无法让它工作。
如何确保每次单击两个按钮中的任何一个时都打开一个新的 JDialog(其中没有以前的输入)。他们对打开的面板使用相同的模板。不同之处在于“编辑行”按钮从 JTable
获取内容并将其输入到文本字段(此 MCVE 中未显示)。我的问题是,如果我在“添加行 JDialog”中输入某些内容,那么当我下次打开对话框时,输入仍然存在。如何以最佳方式在每次打开时创建新的 JDialog 或清除 JDialog 中的数据?
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Window;
import java.awt.Dialog.ModalityType;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.TitledBorder;
import javax.swing.table.DefaultTableModel;
public class Test extends JPanel{
private dialogTemplate diagPanel1 = new dialogTemplate();
private dialogTemplate diagPanel2 = new dialogTemplate();
Object[] columnIdentifiers = {
"id",
"imei",
};
Object[][] data = {
{"1", "123"},
{"2", "123"},
{"3", "123"}
};
private JDialog addDialog;
private JDialog editDialog;
private static DefaultTableModel model;
private JTable table;
public Test(){
setLayout(new BorderLayout());
JPanel pane = new JPanel(new BorderLayout());
JButton addRow = new JButton("Add Row");
addRow.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
openAddRowPane("Add Row");
}
});
JButton editRow = new JButton("Edit Row");
editRow.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
openEditRowPane("Edit Row");
}
});
JPanel buttonPane = new JPanel(new GridLayout(0, 1));
TitledBorder buttonBorder = new TitledBorder("Buttons");
buttonPane.setBorder(buttonBorder);
buttonPane.add(addRow);
buttonPane.add(editRow);
model = new DefaultTableModel();
model.setColumnIdentifiers(columnIdentifiers);
JTable table = new JTable(model);
for(int i = 0; i < data.length; i++){
model.insertRow(i, data[i]);
}
JScrollPane scrollPane = new JScrollPane(table);
pane.add(buttonPane, BorderLayout.LINE_END);
pane.add(scrollPane, BorderLayout.CENTER);
add(pane, BorderLayout.CENTER);
}
public void openAddRowPane(String name){
if(addDialog == null){
Window win = SwingUtilities.getWindowAncestor(this);
if(win != null){
addDialog = new JDialog(win, name, ModalityType.APPLICATION_MODAL);
addDialog.getContentPane().add(diagPanel1);
addDialog.pack();
addDialog.setLocationRelativeTo(null);
}
}
addDialog.setVisible(true);
printRow(diagPanel1.getData());
}
public void openEditRowPane(String name){
if(editDialog == null){
Window win = SwingUtilities.getWindowAncestor(this);
if(win != null){
editDialog = new JDialog(win, name, ModalityType.APPLICATION_MODAL);
editDialog.getContentPane().add(diagPanel2);
editDialog.pack();
editDialog.setLocationRelativeTo(null);
}
}
editDialog.setVisible(true);
printRow(diagPanel2.getData());
}
public void printRow(Object[] data){
int length = data.length;
String s = "[";
for(int i = 0; i < length; i++){
if(i == length-1){
s += data[i].toString() + "]";
} else {
s += data[i].toString() + ", ";
}
}
System.out.println(s);
}
public static void createAndShowGUI(){
JFrame frame = new JFrame("MCVE");
Template_StackOverflowExample mainPanel = new Template_StackOverflowExample();
frame.add(mainPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args){
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowGUI();
}
});
}
}
class dialogTemplate extends JPanel{
private JComponent[] content;
private String[] labelHeaders = {
"ID:",
"IMEI:",
};
private Object[] lastData;
public dialogTemplate(){
JPanel diagTemplate = new JPanel();
diagTemplate.setLayout(new BorderLayout());
JPanel rowContent = new JPanel(new GridLayout(0, 2));
JLabel idLabel = null;
JLabel imeiLabel = null;
JLabel[] labels = {
idLabel,
imeiLabel,
};
JTextField idTextField = new JTextField(20);
JTextField imeiTextField = new JTextField(20);
content = new JComponent[] {
idTextField,
imeiTextField,
};
for(int i = 0; i < labels.length; i++){
labels[i] = new JLabel(labelHeaders[i]);
rowContent.add(labels[i]);
rowContent.add(content[i]);
labels[i].setLabelFor(content[i]);
}
JButton save = new JButton("Save");
save.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
saveData();
closeWindow();
}
});
JButton cancel = new JButton("Cancel");
cancel.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
closeWindow();
}
});
JPanel buttonPane = new JPanel(new GridLayout(0, 1, 5, 5));
buttonPane.add(save);
buttonPane.add(cancel);
buttonPane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
diagTemplate.add(buttonPane, BorderLayout.PAGE_END);
diagTemplate.add(rowContent, BorderLayout.CENTER);
add(diagTemplate);
}
public void saveData(){
lastData = new Object[content.length];
for(int i = 0; i < lastData.length; i++){
if(content[i] instanceof JTextField){
JTextField temp = (JTextField) content[i];
lastData[i] = temp.getText();
}
}
}
public Object[] getData(){
return lastData;
}
public void closeWindow(){
Window win = SwingUtilities.getWindowAncestor(this);
if(win != null) {
win.dispose();
}
}
}
作为一个小旁注,我已经在自己的示例中实现了在表中创建添加和编辑行,并且它们已被排除在此 MCVE 之外。在此示例中,我只想看到我获得了一些“数据”,因此使用了 printRow()
方法。
最佳答案
我修复了编译错误并回答了你的第二个问题。查看评论:
import java.awt.BorderLayout;
import java.awt.Dialog.ModalityType;
import java.awt.GridLayout;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.TitledBorder;
import javax.swing.table.DefaultTableModel;
public class Template_StackOverflowExample extends JPanel{
//changed type to DialogTemplate so you can use getData()
//Alternatively you can keep the type as JPanle and cast:
// ((DialogTemplate)diagPanel1).getData()
private DialogTemplate diagPanel1 = new DialogTemplate();
private DialogTemplate diagPanel2 = new DialogTemplate();
Object[] columnIdentifiers = {
"id",
"imei",
};
Object[][] data = {
{"1", "123"},
{"2", "123"},
{"3", "123"}
};
private JDialog addDialog;
private JDialog editDialog;
private static DefaultTableModel model;
private JTable table;
public Template_StackOverflowExample(){
setLayout(new BorderLayout());
JPanel pane = new JPanel(new BorderLayout());
JButton addRow = new JButton("Add Row");
addRow.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
openAddRowPane("Add Row");
}
});
JButton editRow = new JButton("Edit Row");
editRow.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
openEditRowPane("Edit Row");
}
});
JPanel buttonPane = new JPanel(new GridLayout(0, 1));
TitledBorder buttonBorder = new TitledBorder("Buttons");
buttonPane.setBorder(buttonBorder);
buttonPane.add(addRow);
buttonPane.add(editRow);
model = new DefaultTableModel();
model.setColumnIdentifiers(columnIdentifiers);
JTable table = new JTable(model);
for(int i = 0; i < data.length; i++){
model.insertRow(i, data[i]);
}
JScrollPane scrollPane = new JScrollPane(table);
pane.add(buttonPane, BorderLayout.LINE_END);
pane.add(scrollPane, BorderLayout.CENTER);
add(pane, BorderLayout.CENTER);
}
public void openAddRowPane(String name){
//remove to make a new JDiag each time
//if(addDialog == null){
Window win = SwingUtilities.getWindowAncestor(this);
//if(win != null){ //it is ok if win is null
addDialog = new JDialog(win, name, ModalityType.APPLICATION_MODAL);
addDialog.getContentPane().add(diagPanel1);
addDialog.pack();
addDialog.setLocationRelativeTo(null);
//}
//}
addDialog.setVisible(true);
printRow(diagPanel1.getData());
}
public void openEditRowPane(String name){
//remove to make a new JDiag each time
//if(editDialog == null){
Window win = SwingUtilities.getWindowAncestor(this);
//if(win != null){//it ok if win = null
editDialog = new JDialog(win, name, ModalityType.APPLICATION_MODAL);
editDialog.getContentPane().add(diagPanel2);
editDialog.pack();
editDialog.setLocationRelativeTo(null);
//}
//}
editDialog.setVisible(true);
printRow(diagPanel2.getData());
}
public void printRow(Object[] data){
//add null protection
if(data == null) {
return;
}
int length = data.length;
String s = "[";
for(int i = 0; i < length; i++){
if(i == (length-1)){
s += data[i].toString() + "]";
} else {
s += data[i].toString() + ", ";
}
}
System.out.println(s);
}
public static void createAndShowGUI(){
JFrame frame = new JFrame("MCVE");
Template_StackOverflowExample mainPanel = new Template_StackOverflowExample();
frame.add(mainPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args){
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowGUI();
}
});
}
}
//changed name to start with capital letter
class DialogTemplate extends JPanel{
private JComponent[] content;
private String[] labelHeaders = {
"ID:",
"IMEI:",
};
private Object[] lastData;
public DialogTemplate(){
JPanel diagTemplate = new JPanel();
diagTemplate.setLayout(new BorderLayout());
JPanel rowContent = new JPanel(new GridLayout(0, 2));
JLabel idLabel = null;
JLabel imeiLabel = null;
JLabel[] labels = {
idLabel,
imeiLabel,
};
JTextField idTextField = new JTextField(20);
JTextField imeiTextField = new JTextField(20);
content = new JComponent[] {
idTextField,
imeiTextField,
};
for(int i = 0; i < labels.length; i++){
labels[i] = new JLabel(labelHeaders[i]);
rowContent.add(labels[i]);
rowContent.add(content[i]);
labels[i].setLabelFor(content[i]);
}
JButton save = new JButton("Save");
save.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
saveData();
closeWindow();
}
});
JButton cancel = new JButton("Cancel");
cancel.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
closeWindow();
}
});
JPanel buttonPane = new JPanel(new GridLayout(0, 1, 5, 5));
buttonPane.add(save);
buttonPane.add(cancel);
buttonPane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
diagTemplate.add(buttonPane, BorderLayout.PAGE_END);
diagTemplate.add(rowContent, BorderLayout.CENTER);
add(diagTemplate);
}
public void saveData(){
lastData = new Object[content.length];
for(int i = 0; i < lastData.length; i++){
if(content[i] instanceof JTextField){
JTextField temp = (JTextField) content[i];
lastData[i] = temp.getText();
}
}
}
public Object[] getData(){
return lastData;
}
public void closeWindow(){
Window win = SwingUtilities.getWindowAncestor(this);
if(win != null) {
win.dispose();
}
}
}
(顺便说一句:为什么每次都想打开一个新的诊断?)
为了解决第二个问题,我添加了一个带有 getData() 功能的 JDialog 子类。查看评论:
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.TitledBorder;
import javax.swing.table.DefaultTableModel;
public class Template_StackOverflowExample extends JPanel{
//changed type to DialogTemplate so you can use getData()
//Alternatively you can keep the type as JPanle and cast:
// ((DialogTemplate)diagPanel1).getData()
private DialogTemplate diagPanel1 = new DialogTemplate();
private DialogTemplate diagPanel2 = new DialogTemplate();
Object[] columnIdentifiers = {
"id",
"imei",
};
Object[][] data = {
{"1", "123"},
{"2", "123"},
{"3", "123"}
};
//changed type to JDialog subclass
private Dialog addDialog;
private Dialog editDialog;
private static DefaultTableModel model;
private JTable table;
public Template_StackOverflowExample(){
setLayout(new BorderLayout());
JPanel pane = new JPanel(new BorderLayout());
JButton addRow = new JButton("Add Row");
addRow.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
addDialog = openDialog("Add Row");
Object[] getData = addDialog.getData();
printRow(getData);
}
});
JButton editRow = new JButton("Edit Row");
editRow.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
editDialog = openDialog("Edit Row");
Object[] getData = editDialog.getData();
printRow(getData);
}
});
JPanel buttonPane = new JPanel(new GridLayout(0, 1));
TitledBorder buttonBorder = new TitledBorder("Buttons");
buttonPane.setBorder(buttonBorder);
buttonPane.add(addRow);
buttonPane.add(editRow);
model = new DefaultTableModel();
model.setColumnIdentifiers(columnIdentifiers);
JTable table = new JTable(model);
for(int i = 0; i < data.length; i++){
model.insertRow(i, data[i]);
}
JScrollPane scrollPane = new JScrollPane(table);
pane.add(buttonPane, BorderLayout.LINE_END);
pane.add(scrollPane, BorderLayout.CENTER);
add(pane, BorderLayout.CENTER);
}
public Dialog openDialog(String name){
Window win = SwingUtilities.getWindowAncestor(this);
return new Dialog(win, new DialogTemplate(), name);
}
public void printRow(Object[] data){
//add null protection
if(data == null) {
return;
}
int length = data.length;
String s = "[";
for(int i = 0; i < length; i++){
if(i == (length-1)){
s += data[i].toString() + "]";
} else {
s += data[i].toString() + ", ";
}
}
System.out.println(s);
}
public static void createAndShowGUI(){
JFrame frame = new JFrame("MCVE");
Template_StackOverflowExample mainPanel = new Template_StackOverflowExample();
frame.add(mainPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args){
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowGUI();
}
});
}
}
//subclassed JDialog to add get data functionality
class Dialog extends JDialog {
DialogTemplate diagPanel;
Dialog(Window win, DialogTemplate diagPanel, String name) {
super(win, name, ModalityType.APPLICATION_MODAL);
this.diagPanel = diagPanel;
getContentPane().add(diagPanel);
pack();
setLocationRelativeTo(null);
setVisible(true);
}
Object[] getData(){
return diagPanel.getData();
}
}
//changed name to start with capital letter
class DialogTemplate extends JPanel{
private JComponent[] content;
private String[] labelHeaders = {
"ID:",
"IMEI:",
};
private Object[] lastData;
public DialogTemplate(){
JPanel diagTemplate = new JPanel();
diagTemplate.setLayout(new BorderLayout());
JPanel rowContent = new JPanel(new GridLayout(0, 2));
JLabel idLabel = null;
JLabel imeiLabel = null;
JLabel[] labels = {
idLabel,
imeiLabel,
};
JTextField idTextField = new JTextField(20);
JTextField imeiTextField = new JTextField(20);
content = new JComponent[] {
idTextField,
imeiTextField,
};
for(int i = 0; i < labels.length; i++){
labels[i] = new JLabel(labelHeaders[i]);
rowContent.add(labels[i]);
rowContent.add(content[i]);
labels[i].setLabelFor(content[i]);
}
JButton save = new JButton("Save");
save.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
saveData();
closeWindow();
}
});
JButton cancel = new JButton("Cancel");
cancel.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
closeWindow();
}
});
JPanel buttonPane = new JPanel(new GridLayout(0, 1, 5, 5));
buttonPane.add(save);
buttonPane.add(cancel);
buttonPane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
diagTemplate.add(buttonPane, BorderLayout.PAGE_END);
diagTemplate.add(rowContent, BorderLayout.CENTER);
add(diagTemplate);
}
public void saveData(){
lastData = new Object[content.length];
for(int i = 0; i < lastData.length; i++){
if(content[i] instanceof JTextField){
JTextField temp = (JTextField) content[i];
lastData[i] = temp.getText();
}
}
}
public Object[] getData(){
return lastData;
}
public void closeWindow(){
Window win = SwingUtilities.getWindowAncestor(this);
if(win != null) {
win.dispose();
}
}
}
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