我正在尝试使用 JTabbedPane 创建一个 gui 应用程序来创建连接到数据库的 5 个选项卡。每个选项卡都包含一个面板，其中包含 3 个面板（一个面板用于保存 JButton，另一个用于保存 JLabels 和 JTextField，最后一个用于保存 JTable。分别位于南、中和北）。但是在创建选项卡及其组件后，只显示最后一个选项卡并且显示不正确（它显示所有 5 个选项卡的 JLabels、JTextfields 和 JButtons）。如果我删除所有选项卡并留下一个，它会正确显示，但如果有多个，它会显示在最后一个选项卡上。我不知道如何解决它。请帮我。
源代码有点长，请多多包涵并帮我检查。如果有更好的方法来编写代码，请告诉我。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
import java.sql.*;
import java.util.Vector;
public class Project_SalesDatabase extends JFrame {
JTabbedPane tabbedPane = new JTabbedPane();
ImageIcon icon = createImageIcon("images/middle.gif");
JButton view = new JButton(" View ");
JButton save = new JButton(" Save ");
JButton addNew = new JButton(" Add New ");
JButton exit = new JButton(" Exit Application ");
JPanel displayBiscuitsPanel = new JPanel();
JPanel displayCookingPanel = new JPanel();
JPanel displayCustomersPanel = new JPanel();
JPanel displayEmployeesPanel = new JPanel();
JPanel displayProvisionsPanel = new JPanel();
JPanel displayButton = new JPanel();
JPanel displayContent = new JPanel((new GridLayout(10, 2)));
JPanel displayTable = new JPanel(new GridLayout(1, 2));
JTextField biscuitName = new JTextField();
JTextField biscuitPrice = new JTextField();
JTextField biscuitCompany = new JTextField();
JTextField quantityOfBiscuitsBought = new JTextField();
JTextField quantityOfBiscuitsSold = new JTextField();
JTextField quantityInStock = new JTextField();
JTextField itemName = new JTextField();
JTextField itemPrice = new JTextField();
JTextField itemType = new JTextField();
JTextField quantityOfitemsBought = new JTextField();
JTextField quantityOfitemsSold = new JTextField();
JTextField firstName = new JTextField();
JTextField lastName = new JTextField();
JTextField customerAttendant = new JTextField();
JTextField customerAttendantPosition = new JTextField();
JTextField isCustomerADebtor = new JTextField();
JTextField orderNumber = new JTextField();
JTextField debtAmount = new JTextField();
JTextField address = new JTextField();
JTextField phoneNumber = new JTextField();
JTextField position = new JTextField();
JTextField age = new JTextField();
JTextField salary = new JTextField();
JTextField nextOfKin = new JTextField();
JTextField relationshipWithNextOfKin = new JTextField();
JTextField nextOfKinPhoneNumber = new JTextField();
JTextField itemCompany = new JTextField();
public static void main(String[] args) {
Project_SalesDatabase mainFrame = new Project_SalesDatabase();
mainFrame.setLocationRelativeTo(null);
mainFrame.setVisible(true);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public Project_SalesDatabase() {
setTitle(" Database App ");
setSize(1000, 500);
// Create the tab pages
biscuitsTable();
cookingIngredientsTable();
customersTable();
employeesTable();
provisionsTable();
JPanel topPanel = new JPanel();
topPanel.setLayout(new GridLayout(1, 3));
getContentPane().add(topPanel);
topPanel.add(tabbedPane, BorderLayout.CENTER);
// Create tabs in tabbedPane
tabbedPane.addTab("Biscuits Database", icon, displayBiscuitsPanel,
"Allows you to view or Enter Data into the Biscuits Database");
tabbedPane.addTab("Cooking Ingredients Database", icon, displayCookingPanel,
"Allows you to view or Enter Data into the Cooking Ingredients Database");
tabbedPane.addTab("Customers Database", icon, displayCustomersPanel,
"Allows you to view or Enter Data into the Customers Database");
tabbedPane.addTab("Employees Database", icon, displayEmployeesPanel,
"Allows you to view or Enter Data into the Employees Database");
tabbedPane.addTab("Provisions Database", icon, displayProvisionsPanel,
"Allows you to view or Enter Data into the Provisions Database");
//Enable scrolling in tabs.
tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
}
public static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = Project_SalesDatabase.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
public final void biscuitsTable() {
displayBiscuitsPanel.setLayout(new BorderLayout());
displayBiscuitsPanel.add(displayContent, BorderLayout.CENTER);
displayBiscuitsPanel.add(displayButton, BorderLayout.SOUTH);
displayBiscuitsPanel.add(displayTable, BorderLayout.NORTH);
displayContent.add(new JLabel("Biscuit Name"));
displayContent.add(biscuitName);
displayContent.add(new JLabel("Biscuit Price"));
displayContent.add(biscuitPrice);
displayContent.add(new JLabel("Biscuit Company"));
displayContent.add(biscuitCompany);
displayContent.add(new JLabel("Quantity Of Biscuits Bought"));
displayContent.add(quantityOfBiscuitsBought);
displayContent.add(new JLabel("Quantity Of Biscuits Sold"));
displayContent.add(quantityOfBiscuitsSold);
displayContent.add(new JLabel("Quantity In Stock"));
displayContent.add(quantityInStock);
displayButton.add(addNew);
displayButton.add(save);
displayButton.add(view);
displayButton.add(exit);
view.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String db_url = "jdbc:odbc:ProjectSalesDatabase";
String username = "";
String password = "";
Connection con = null;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection(db_url, username, password);
} catch (ClassNotFoundException | SQLException f) {
JOptionPane.showMessageDialog(rootPane, f.getMessage());
}
Statement state = null;
ResultSet set = null;
try {
String Query = "SELECT * FROM Biscuits";
state = con.createStatement();
set = state.executeQuery(Query);
boolean nextrec = set.next();
if (!nextrec) {
JOptionPane.showMessageDialog(rootPane, "No Record");
} else {
Vector col = new Vector();
Vector row = new Vector();
ResultSetMetaData rsm = set.getMetaData();
for (int x = 1; x <= rsm.getColumnCount(); x++) {
col.addElement(rsm.getColumnName(x));
}
do {
row.addElement(getNextRow(set, rsm));
} while (set.next());
JTable tab = new JTable(row, col);
displayContent.removeAll();
displayTable.removeAll();
displayTable.add(new JScrollPane(tab), BorderLayout.CENTER);
validate();
}
state.close();
} catch (SQLException sql) {
JOptionPane.showMessageDialog(rootPane, sql.getMessage());
}
}
});
save.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
String Query = "INSERT INTO Biscuits VALUES ('" + biscuitName.getText() + "',"
+ " '" + biscuitPrice.getText() + "',"
+ " '" + biscuitCompany.getText() + "',"
+ " '" + quantityOfBiscuitsBought.getText() + "',"
+ " '" + quantityOfBiscuitsSold.getText() + "',"
+ " '" + quantityInStock.getText() + "')";
String db_url = "jdbc:odbc:ProjectSalesDatabase";
String username = "";
String password = "";
Connection con = null;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection(db_url, username, password);
} catch (ClassNotFoundException | SQLException f) {
JOptionPane.showMessageDialog(rootPane, f.getMessage());
}
Statement state = con.createStatement();
int rep = state.executeUpdate(Query);
if (rep == 0) {
JOptionPane.showMessageDialog(rootPane, "No Data Saved");
} else {
JOptionPane.showMessageDialog(rootPane, "Data Saved");
}
} catch (SQLException sqle) {
sqle.getMessage();
}
}
});
addNew.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
biscuitName.setText("");
biscuitPrice.setText("");
biscuitCompany.setText("");
quantityOfBiscuitsBought.setText("");
quantityOfBiscuitsSold.setText("");
quantityInStock.setText("");
displayTable.removeAll();
displayContent.removeAll();
displayContent.add(new JLabel("Biscuit Name"));
displayContent.add(biscuitName);
displayContent.add(new JLabel("Biscuit Price"));
displayContent.add(biscuitPrice);
displayContent.add(new JLabel("Biscuit Company"));
displayContent.add(biscuitCompany);
displayContent.add(new JLabel("Quantity Of Biscuits Bought"));
displayContent.add(quantityOfBiscuitsBought);
displayContent.add(new JLabel("Quantity Of Biscuits Sold"));
displayContent.add(quantityOfBiscuitsSold);
displayContent.add(new JLabel("Quantity In Stock"));
displayContent.add(quantityInStock);
validate();
} catch (Exception f) {
f.getMessage();
}
}
});
exit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
}
public final void cookingIngredientsTable() {
displayCookingPanel.setLayout(new BorderLayout());
displayCookingPanel.add(displayContent, BorderLayout.CENTER);
displayCookingPanel.add(displayButton, BorderLayout.SOUTH);
displayCookingPanel.add(displayTable, BorderLayout.NORTH);
displayContent.add(new JLabel("Item Name"));
displayContent.add(itemName);
displayContent.add(new JLabel("Item Price"));
displayContent.add(itemPrice);
displayContent.add(new JLabel("Item Type"));
displayContent.add(itemType);
displayContent.add(new JLabel("Quantity Of Items Bought"));
displayContent.add(quantityOfitemsBought);
displayContent.add(new JLabel("Quantity Of Items Sold"));
displayContent.add(quantityOfitemsSold);
displayContent.add(new JLabel("Quantity In Stock"));
displayContent.add(quantityInStock);
displayButton.add(addNew);
displayButton.add(save);
displayButton.add(view);
displayButton.add(exit);
view.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String db_url = "jdbc:odbc:ProjectSalesDatabase";
String username = "";
String password = "";
Connection con = null;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection(db_url, username, password);
} catch (ClassNotFoundException | SQLException f) {
JOptionPane.showMessageDialog(rootPane, f.getMessage());
}
Statement state = null;
ResultSet set = null;
try {
String Query = "SELECT * FROM CookingIngredients";
state = con.createStatement();
set = state.executeQuery(Query);
boolean nextrec = set.next();
if (!nextrec) {
JOptionPane.showMessageDialog(rootPane, "No Record");
} else {
Vector col = new Vector();
Vector row = new Vector();
ResultSetMetaData rsm = set.getMetaData();
for (int x = 1; x <= rsm.getColumnCount(); x++) {
col.addElement(rsm.getColumnName(x));
}
do {
row.addElement(getNextRow(set, rsm));
} while (set.next());
JTable tab = new JTable(row, col);
displayContent.removeAll();
displayTable.removeAll();
displayTable.add(new JScrollPane(tab), BorderLayout.CENTER);
validate();
}
state.close();
} catch (SQLException sql) {
JOptionPane.showMessageDialog(rootPane, sql.getMessage());
}
}
});
save.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
String Query = "INSERT INTO CookingIngredients VALUES ('" + itemName.getText() + "',"
+ " '" + itemPrice.getText() + "',"
+ " '" + itemType.getText() + "',"
+ " '" + quantityOfitemsBought.getText() + "',"
+ " '" + quantityOfitemsSold.getText() + "',"
+ " '" + quantityInStock.getText() + "')";
String db_url = "jdbc:odbc:ProjectSalesDatabase";
String username = "";
String password = "";
Connection con = null;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection(db_url, username, password);
} catch (ClassNotFoundException | SQLException f) {
JOptionPane.showMessageDialog(rootPane, f.getMessage());
}
Statement state = con.createStatement();
int rep = state.executeUpdate(Query);
if (rep == 0) {
JOptionPane.showMessageDialog(rootPane, "No Data Saved");
} else {
JOptionPane.showMessageDialog(rootPane, "Data Saved");
}
} catch (SQLException sqle) {
sqle.getMessage();
}
}
});
addNew.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
itemName.setText("");
itemPrice.setText("");
itemType.setText("");
quantityOfitemsBought.setText("");
quantityOfBiscuitsSold.setText("");
quantityOfitemsSold.setText("");
quantityInStock.setText("");
displayTable.removeAll();
displayContent.removeAll();
displayContent.add(new JLabel("Item Name"));
displayContent.add(itemName);
displayContent.add(new JLabel("Item Price"));
displayContent.add(itemPrice);
displayContent.add(new JLabel("Item Type"));
displayContent.add(itemType);
displayContent.add(new JLabel("Quantity Of Items Bought"));
displayContent.add(quantityOfitemsBought);
displayContent.add(new JLabel("Quantity Of Items Sold"));
displayContent.add(quantityOfitemsSold);
displayContent.add(new JLabel("Quantity In Stock"));
displayContent.add(quantityInStock);
validate();
} catch (Exception f) {
f.getMessage();
}
}
});
}
public final void customersTable() {
displayCustomersPanel.setLayout(new BorderLayout());
displayCustomersPanel.add(displayContent, BorderLayout.CENTER);
displayCustomersPanel.add(displayButton, BorderLayout.SOUTH);
displayCustomersPanel.add(displayTable, BorderLayout.NORTH);
displayContent.add(new JLabel("First Name"));
displayContent.add(firstName);
displayContent.add(new JLabel("Last Name"));
displayContent.add(lastName);
displayContent.add(new JLabel("Customer Attendant"));
displayContent.add(customerAttendant);
displayContent.add(new JLabel("Customer Attendant's Position"));
displayContent.add(customerAttendantPosition);
displayContent.add(new JLabel("Is This Customer A Debtor?"));
displayContent.add(isCustomerADebtor);
displayContent.add(new JLabel("Order Number"));
displayContent.add(orderNumber);
displayContent.add(new JLabel("Debt Amount"));
displayContent.add(debtAmount);
displayContent.add(new JLabel("Customer's Address"));
displayContent.add(address);
displayContent.add(new JLabel("Customer's Phone Number"));
displayContent.add(phoneNumber);
displayButton.add(addNew);
displayButton.add(save);
displayButton.add(view);
displayButton.add(exit);
//button actions same as other methods. Removed it because of body character limits
}
public final void employeesTable() {
displayEmployeesPanel.setLayout(new BorderLayout());
displayEmployeesPanel.add(displayContent, BorderLayout.CENTER);
displayEmployeesPanel.add(displayButton, BorderLayout.SOUTH);
displayEmployeesPanel.add(displayTable, BorderLayout.NORTH);
displayContent.add(new JLabel("First Name"));
displayContent.add(firstName);
displayContent.add(new JLabel("Last Name"));
displayContent.add(lastName);
displayContent.add(new JLabel("Position"));
displayContent.add(position);
displayContent.add(new JLabel("Age"));
displayContent.add(age);
displayContent.add(new JLabel("Salary"));
displayContent.add(salary);
displayContent.add(new JLabel("Employees's Address"));
displayContent.add(address);
displayContent.add(new JLabel("Employees's Phone Number(s)"));
displayContent.add(phoneNumber);
displayContent.add(new JLabel("Next of Kin"));
displayContent.add(nextOfKin);
displayContent.add(new JLabel("Relationship With Next of Kin"));
displayContent.add(relationshipWithNextOfKin);
displayContent.add(new JLabel("Next of Kin's Phone Number(s)"));
displayContent.add(nextOfKinPhoneNumber);
displayButton.add(addNew);
displayButton.add(save);
displayButton.add(view);
displayButton.add(exit);
//button actions same as other methods. Removed it because of body character limits
}
public final void provisionsTable() {
displayProvisionsPanel.setLayout(new BorderLayout());
displayProvisionsPanel.add(displayContent, BorderLayout.CENTER);
displayProvisionsPanel.add(displayButton, BorderLayout.SOUTH);
displayProvisionsPanel.add(displayTable, BorderLayout.NORTH);
displayContent.add(new JLabel("Item Name"));
displayContent.add(itemName);
displayContent.add(new JLabel("Item Price"));
displayContent.add(itemPrice);
displayContent.add(new JLabel("Item Company"));
displayContent.add(itemCompany);
displayContent.add(new JLabel("Quantity Of Items Bought"));
displayContent.add(quantityOfitemsBought);
displayContent.add(new JLabel("Quantity Of Items Sold"));
displayContent.add(quantityOfitemsSold);
displayContent.add(new JLabel("Quantity In Stock"));
displayContent.add(quantityInStock);
displayButton.add(addNew);
displayButton.add(save);
displayButton.add(view);
displayButton.add(exit);
view.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String db_url = "jdbc:odbc:ProjectSalesDatabase";
String username = "";
String password = "";
Connection con = null;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection(db_url, username, password);
} catch (ClassNotFoundException | SQLException f) {
JOptionPane.showMessageDialog(rootPane, f.getMessage());
}
Statement state = null;
ResultSet set = null;
try {
String Query = "SELECT * FROM Provisions";
state = con.createStatement();
set = state.executeQuery(Query);
boolean nextrec = set.next();
if (!nextrec) {
JOptionPane.showMessageDialog(rootPane, "No Record");
} else {
Vector col = new Vector();
Vector row = new Vector();
ResultSetMetaData rsm = set.getMetaData();
for (int x = 1; x <= rsm.getColumnCount(); x++) {
col.addElement(rsm.getColumnName(x));
}
do {
row.addElement(getNextRow(set, rsm));
} while (set.next());
JTable tab = new JTable(row, col);
displayContent.removeAll();
displayTable.removeAll();
displayTable.add(new JScrollPane(tab), BorderLayout.CENTER);
validate();
}
state.close();
} catch (SQLException sql) {
JOptionPane.showMessageDialog(rootPane, sql.getMessage());
}
}
});
save.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
String Query = "INSERT INTO Provisions VALUES ('" + itemName.getText() + "',"
+ " '" + itemPrice.getText() + "',"
+ " '" + itemCompany.getText() + "',"
+ " '" + quantityOfitemsBought.getText() + "',"
+ " '" + quantityOfitemsSold.getText() + "',"
+ " '" + quantityInStock.getText() + "')";
String db_url = "jdbc:odbc:ProjectSalesDatabase";
String username = "";
String password = "";
Connection con = null;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection(db_url, username, password);
} catch (ClassNotFoundException | SQLException f) {
JOptionPane.showMessageDialog(rootPane, f.getMessage());
}
Statement state = con.createStatement();
int rep = state.executeUpdate(Query);
if (rep == 0) {
JOptionPane.showMessageDialog(rootPane, "No Data Saved");
} else {
JOptionPane.showMessageDialog(rootPane, "Data Saved");
}
} catch (SQLException sqle) {
sqle.getMessage();
}
}
});
addNew.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
itemName.setText("");
itemPrice.setText("");
itemCompany.setText("");
quantityOfitemsBought.setText("");
quantityOfitemsSold.setText("");
quantityInStock.setText("");
displayTable.removeAll();
displayContent.removeAll();
displayContent.add(new JLabel("Item Name"));
displayContent.add(itemName);
displayContent.add(new JLabel("Item Price"));
displayContent.add(itemPrice);
displayContent.add(new JLabel("Item Company"));
displayContent.add(itemCompany);
displayContent.add(new JLabel("Quantity Of Items Bought"));
displayContent.add(quantityOfitemsBought);
displayContent.add(new JLabel("Quantity Of Items Sold"));
displayContent.add(quantityOfitemsSold);
displayContent.add(new JLabel("Quantity In Stock"));
displayContent.add(quantityInStock);
validate();
} catch (Exception f) {
f.getMessage();
}
}
});
}
Vector getNextRow(ResultSet set, ResultSetMetaData rsm) {
Vector currentRow = new Vector();
try {
for (int x = 1; x <= rsm.getColumnCount(); x++) {
switch (rsm.getColumnType(x)) {
case Types.VARCHAR:
currentRow.addElement(set.getString(x));
break;
case Types.INTEGER:
currentRow.addElement(new Long(set.getLong(x)));
break;
default:
System.out.println("No column type known");
break;
}
}
} catch (SQLException sqle) {
sqle.getMessage();
}
return currentRow;
}
}
我不知道为什么它不能正常工作。请如果有人可以尝试编译/运行它来看看我在说什么。谢谢。