我正在用Java制作简单的CRUD应用程序，我想为用户选择的结果创建＆＃34;详细视图＆＃34; 。我有一个简单的代码，可以创建记录并使用JDBC将它们填充到表中。现在我想要做到这一点，如果用户在JTable中双击行时选择一条记录，他应该看到结果的详细视图。
Class Customer.java
package customereditor;
public class Customer {
private int Id;
private String name;
private String surname;
public int getID() {
return Id;
}
public void setId(int Id) {
this.Id = Id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
@Override
public String toString() {
return "Customer{" + "ID=" + Id + ", name=" + name + ", surname=" + surname + '}';
}
}
Class CustomerDao.java
package customereditor;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
public class CustomerDao {
public static Connection getConnection() {
Connection conn = null;
try {
conn = DriverManager.getConnection("jdbc:derby://localhost:1527/CustomerEditorDb");
} catch (SQLException ex) {
Logger.getLogger(CustomerDao.class.getName()).log(Level.SEVERE, null, ex);
}
return conn;
}
public static List<Customer> getAllCustomers() {
List<Customer> allCustomers = new ArrayList();
try {
Connection conn = getConnection();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM CE_CUSTOMERS");
while (rs.next()) {
Customer customer = new Customer();
customer.setId(rs.getInt(1));
customer.setName(rs.getString(2));
customer.setSurname(rs.getString(3));
allCustomers.add(customer);
}
} catch (SQLException ex) {
Logger.getLogger(CustomerDao.class.getName()).log(Level.SEVERE, null, ex);
}
return allCustomers;
}
public static List<String> getColumnNames() {
List<String> columnNames = new ArrayList();
try {
Connection conn = getConnection();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM CE_CUSTOMERS");
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();
for (int i = 1; i <= columnCount; i++) {
String columnName = rsmd.getColumnName(i);
columnNames.add(columnName);
}
} catch (SQLException ex) {
Logger.getLogger(CustomerDao.class.getName()).log(Level.SEVERE, null, ex);
}
return columnNames;
}
public static void createCustomer(Customer customer) {
try {
Connection conn = getConnection();
PreparedStatement pstmt = conn.prepareStatement("INSERT INTO CE_CUSTOMERS(ID, NAME, SURNAME) VALUES (?,?,?)");
pstmt.setInt(1, customer.getID());
pstmt.setString(2, customer.getName());
pstmt.setString(3, customer.getSurname());
pstmt.execute();
} catch (SQLException ex) {
Logger.getLogger(CustomerDao.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static Customer getCustomerById(int customerId) {
Customer customer = new Customer();
try {
Connection conn = getConnection();
PreparedStatement pstmt = conn.prepareStatement("SELECT * FROM CE_CUSTOMERS WHERE ID=?");
pstmt.setInt(1, customerId);
ResultSet rs = pstmt.executeQuery();
while (rs.next()) {
customer.setId(rs.getInt(1));
customer.setName(rs.getString(2));
customer.setSurname(rs.getString(3));
}
} catch (SQLException ex) {
Logger.getLogger(CustomerDao.class.getName()).log(Level.SEVERE, null, ex);
}
return customer;
}
public static void deleteCustomer(int customerId) {
try {
Connection conn = getConnection();
PreparedStatement pstmt = conn.prepareStatement("DELETE FROM CE_CUSTOMERS WHERE ID=?");
pstmt.setInt(1, customerId);
pstmt.executeUpdate();
} catch (SQLException ex) {
Logger.getLogger(CustomerDao.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
Class DataTableModel.java
package customereditor;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.swing.table.AbstractTableModel;
public class DataTableModel extends AbstractTableModel {
private final Map<Integer, Boolean> checkBoxes;
private final List<String> columnNames;
private final List<Customer> allCustomers;
public DataTableModel() {
this.checkBoxes = new HashMap<>();
this.columnNames = CustomerDao.getColumnNames();
this.allCustomers = CustomerDao.getAllCustomers();
}
public void addRow(Customer customer) {
allCustomers.add(customer);
fireTableRowsInserted(allCustomers.size() - 1, allCustomers.size() - 1);
}
public void removeRow(int rowIndex) {
allCustomers.remove(rowIndex);
fireTableRowsDeleted(rowIndex, rowIndex);
}
@Override
public String getColumnName(int columnIndex) {
if (columnIndex > 0) {
return columnNames.get(columnIndex - 1);
} else {
return "#";
}
}
@Override
public int getRowCount() {
return allCustomers.size();
}
@Override
public int getColumnCount() {
return columnNames.size() + 1;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Customer customer = allCustomers.get(rowIndex);
switch (columnIndex) {
case 0:
Object value = checkBoxes.get(rowIndex);
return (value == null) ? Boolean.FALSE : value;
case 1:
return customer.getID();
case 2:
return customer.getName();
case 3:
return customer.getSurname();
default:
return null;
}
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
if (columnIndex > 0) {
return false;
} else {
return true;
}
}
@Override
public void setValueAt(Object value, int rowIndex, int columnIndex) {
if (columnIndex > 0) {
Customer customer = allCustomers.get(rowIndex);
switch (columnIndex) {
case 1:
customer.setId((int) value);
case 2:
customer.setName((String) value);
case 3:
customer.setSurname((String) value);
}
} else {
checkBoxes.put(rowIndex, (boolean) value);
}
}
@Override
public Class getColumnClass(int columnIndex) {
switch (columnIndex) {
case 0:
return Boolean.class;
case 1:
return Integer.class;
case 2:
return String.class;
case 3:
return String.class;
default:
return String.class;
}
}
}
Class CustomerEditorMain.java
package customereditor;
import javax.swing.JFrame;
public class CustomerEditorMain {
private static void createAndShowGui() {
//Create and set up the window.
JFrame frame = new JFrame("TableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
CustomerView view = new CustomerView();
frame.add(view);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
Class CustomerView.java
package customereditor;
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
public class CustomerView extends JPanel {
private final CardLayout cardLayout;
private final JPanel cards;
private final DataTableModel dataModel;
private final JTable table;
public CustomerView() {
this.cardLayout = new CardLayout();
this.cards = new JPanel(cardLayout);
this.dataModel = new DataTableModel();
this.table = new JTable(dataModel);
initComponents();
}
private void initComponents() {
setLayout(new BorderLayout());
add(createButtonsPanel(), BorderLayout.PAGE_START);
cards.add(createShowAllCustomersPanel(), "createShowAllCustomersPanel");
cards.add(createNewCustomerPanel(), "createNewCustomerPanel");
add(cards, BorderLayout.CENTER);
}
private JPanel createButtonsPanel() {
JPanel buttonsPanel = new JPanel(new FlowLayout());
JButton createNewCustomer = new JButton("New");
createNewCustomer.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
cardLayout.show(cards, "createNewCustomerPanel");
}
});
buttonsPanel.add(createNewCustomer);
JButton deleteCustomer = new JButton("Delete");
deleteCustomer.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
for (int i = dataModel.getRowCount() - 1; i >= 0; i--) {
boolean checked = (boolean) dataModel.getValueAt(i, 0);
if (checked) {
CustomerDao.deleteCustomer((int) dataModel.getValueAt(i, 1));
dataModel.removeRow(i);
dataModel.setValueAt(Boolean.FALSE, i, 0);
}
}
}
});
buttonsPanel.add(deleteCustomer);
return buttonsPanel;
}
private JPanel createShowAllCustomersPanel() {
JPanel createShowAllCustomersPanel = new JPanel(new BorderLayout());
table.addMouseListener(new MouseListener() {
@Override
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
// get ID value from selected row and "first" column
int getCustomerId = (int) table.getValueAt(table.getSelectedRow(), 1);
// create JPanel and add to cards
cards.add(detailCustomerViewPanel(getCustomerId), "detailCustomerViewPanel");
cardLayout.show(cards, "detailCustomerViewPanel");
}
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
});
JScrollPane paneTable = new JScrollPane(table);
createShowAllCustomersPanel.add(paneTable);
return createShowAllCustomersPanel;
}
private JPanel createNewCustomerPanel() {
JPanel createNewCustomerPanel = new JPanel();
JLabel idLabel = new JLabel("Id:");
createNewCustomerPanel.add(idLabel);
JTextField idField = new JTextField(10);
createNewCustomerPanel.add(idField);
JLabel nameLabel = new JLabel("Name:");
createNewCustomerPanel.add(nameLabel);
JTextField nameField = new JTextField(10);
createNewCustomerPanel.add(nameField);
JLabel surnameLabel = new JLabel("Surname:");
createNewCustomerPanel.add(surnameLabel);
JTextField surnameField = new JTextField(10);
createNewCustomerPanel.add(surnameField);
JButton saveButton = new JButton("Save");
saveButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (idField.getText() != "") {
Customer customer = new Customer();
customer.setId(Integer.parseInt(idField.getText()));
customer.setName(nameField.getText());
customer.setSurname(surnameField.getText());
CustomerDao.createCustomer(customer);
dataModel.addRow(customer);
}
}
});
createNewCustomerPanel.add(saveButton);
JButton closeButton = new JButton("Close");
closeButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
cardLayout.show(cards, "createShowAllCustomersPanel");
}
});
createNewCustomerPanel.add(closeButton);
return createNewCustomerPanel;
}
private JPanel detailCustomerViewPanel(int customerId) {
JPanel detailCustomerViewPanel = new JPanel(new FlowLayout());
// get customer by ID
Customer customer = CustomerDao.getCustomerById(customerId);
JLabel idLabel = new JLabel("Id:");
detailCustomerViewPanel.add(idLabel);
JTextField idField = new JTextField(10);
idField.setText(Integer.toString(customer.getID()));
detailCustomerViewPanel.add(idField);
JLabel nameLabel = new JLabel("Name:");
detailCustomerViewPanel.add(nameLabel);
JTextField nameField = new JTextField(10);
nameField.setText(customer.getName());
detailCustomerViewPanel.add(nameField);
JLabel surnameLabel = new JLabel("Surname:");
detailCustomerViewPanel.add(surnameLabel);
JTextField surnameField = new JTextField(10);
surnameField.setText(customer.getSurname());
detailCustomerViewPanel.add(surnameField);
JButton closeButton = new JButton("Close");
closeButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
cardLayout.show(cards, "createShowAllCustomersPanel");
}
});
detailCustomerViewPanel.add(closeButton);
return detailCustomerViewPanel;
}
}
所以我的问题是：有更好的方法吗？