我有两个类，Window和CustomerInfo。 Window类显示登录用户界面，用户将在其中输入有效的用户名和密码到textFields中。我编写的代码正确地接受了正确的用户名和密码并拒绝了错误的信息。如果信息正确，则打开CustomerInfo类，其中包含多个textField，用于显示名称，地址，电话号码等用户信息。此用户信息存储在SQLite数据库中，当用户登录并设置textFields时，我将从该数据库中提取该数据库。使用适当的先前输入和保存的信息。
如您所见，我正在使用SELECT FROM语句来访问此信息。我需要包含一个WHERE子句，它将从输入的用户名中提取（例如SELECT FirstName FROM CustInfo WHERE Username = username）。 username变量将是用户登录的任何一个。我试图通过String username = textFieldUsernameCust.getText（）;设置该变量。我不知道在哪里声明这个变量语句，因为textFieldUsernameCust文本框在Window类中，我需要在CustomerInfo类中使用这个变量。
窗口类......
public class Window {
private JFrame frame;
public static JTextField textFieldUsernameCust;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Window window = new Window();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
Connection connection=null;
public JPasswordField passwordFieldCust;
public JTextField textFieldUsernameComp;
public JPasswordField passwordFieldComp;
/**
* Create the application.
*/
public Window() {
initialize();
connection=sqliteConnection.dbConnector();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setResizable(false);
frame.setBounds(100, 100, 619, 377);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
JLabel lblUsername = new JLabel("Username:");
lblUsername.setFont(new Font("Tahoma", Font.PLAIN, 14));
lblUsername.setBounds(86, 166, 86, 14);
frame.getContentPane().add(lblUsername);
JLabel lblPassword = new JLabel("Password:");
lblPassword.setFont(new Font("Tahoma", Font.PLAIN, 14));
lblPassword.setBounds(86, 202, 65, 14);
frame.getContentPane().add(lblPassword);
textFieldUsernameCust = new JTextField();
textFieldUsernameCust.setBounds(182, 165, 97, 20);
frame.getContentPane().add(textFieldUsernameCust);
textFieldUsernameCust.setColumns(10);
JButton btnLoginCust = new JButton("Login (Customer)");
btnLoginCust.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
try {
String query="select * from CustomerInfo where Username=? and Password=?";
PreparedStatement pst=connection.prepareStatement(query);
pst.setString(1, textFieldUsernameCust.getText() );
pst.setString(2, passwordFieldCust.getText() );
ResultSet rs=pst.executeQuery();
int count=0;
while(rs.next()){
count=count+1;
}
if (count==1)
{
JOptionPane.showMessageDialog(null, "Login Successful");
frame.dispose();
CustomerInfo custinfo=new CustomerInfo();
custinfo.setVisible(true);
}
else if(count>1)
{
JOptionPane.showMessageDialog(null, "Duplicate Username or Password");
}
else
{
JOptionPane.showMessageDialog(null, "Username or Password is incorrect. Please try again");
}
rs.close();
pst.close();
} catch(Exception e)
{
JOptionPane.showMessageDialog(null, e);
}
}
});
btnLoginCust.setBounds(116, 259, 117, 23);
frame.getContentPane().add(btnLoginCust);
JLabel lblWelcome = new JLabel("Welcome to InsurU");
lblWelcome.setFont(new Font("Tahoma", Font.BOLD | Font.ITALIC, 20));
lblWelcome.setBounds(221, 46, 232, 20);
frame.getContentPane().add(lblWelcome);
passwordFieldCust = new JPasswordField();
passwordFieldCust.setBounds(182, 201, 97, 20);
frame.getContentPane().add(passwordFieldCust);
JLabel label = new JLabel("Username:");
label.setFont(new Font("Tahoma", Font.PLAIN, 14));
label.setBounds(329, 168, 86, 14);
frame.getContentPane().add(label);
JLabel label_1 = new JLabel("Password:");
label_1.setFont(new Font("Tahoma", Font.PLAIN, 14));
label_1.setBounds(329, 204, 65, 14);
frame.getContentPane().add(label_1);
textFieldUsernameComp = new JTextField();
textFieldUsernameComp.setColumns(10);
textFieldUsernameComp.setBounds(425, 165, 97, 20);
frame.getContentPane().add(textFieldUsernameComp);
JButton btnLogincompanyt = new JButton("Login (Company)");
btnLogincompanyt.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
try {
String query="select * from CustomerInfo where UserName=? and Password=?";
PreparedStatement pst=connection.prepareStatement(query);
pst.setString(1, textFieldUsernameComp.getText() );
pst.setString(2, passwordFieldComp.getText() );
ResultSet rs=pst.executeQuery();
int count=0;
while(rs.next()){
count=count+1;
}
if (count==1)
{
JOptionPane.showMessageDialog(null, "Login Successful");
frame.dispose();
CompanyInfo compinfo=new CompanyInfo();
compinfo.setVisible(true);
}
else if(count>1)
{
JOptionPane.showMessageDialog(null, "Duplicate Username or Password");
}
else
{
JOptionPane.showMessageDialog(null, "Username or Password is incorrect. Please try again");
}
rs.close();
pst.close();
} catch(Exception e)
{
JOptionPane.showMessageDialog(null, e);
}
}
});
btnLogincompanyt.setBounds(374, 259, 117, 23);
frame.getContentPane().add(btnLogincompanyt);
JLabel lblCustomerLogin = new JLabel("Customer Login");
lblCustomerLogin.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblCustomerLogin.setBounds(116, 107, 117, 22);
frame.getContentPane().add(lblCustomerLogin);
JLabel lblCompanyLogin = new JLabel("Company Login");
lblCompanyLogin.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblCompanyLogin.setBounds(374, 108, 117, 20);
frame.getContentPane().add(lblCompanyLogin);
passwordFieldComp = new JPasswordField();
passwordFieldComp.setBounds(425, 201, 97, 20);
frame.getContentPane().add(passwordFieldComp);
}
}
CustomerInfo类......
public class CustomerInfo extends JFrame {
private JPanel contentPane;
private JTextField textFieldFirstName;
private JTextField textFieldLastName;
private JTextField textFieldAdress;
private JTextField textFieldCity;
private JTextField textFieldZipCode;
private JTextField textFieldEmail;
private JTextField textFieldNumber;
private JTextField textFieldAge;
private JTextField textFieldUsername;
private JTextField textFieldPassword;
private JTextField textField_10;
private JTextField textField_11;
private JTextField textField_12;
private JTextField textField_13;
private JTextField textField_14;
private JTextField textField_15;
private JTextField textField_16;
private JTextField textField_17;
private JTextField textFieldAnnualCar1;
private JTextField textField_19;
private JTextField textField_20;
private JTextField textFieldAnnualCar2;
private JTextField textField_22;
private JTextField textField_23;
private JTextField textFieldAnnualCar3;
private JTextField textFieldTotalDrivers;
private JTextField textField_26;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
CustomerInfo frame = new CustomerInfo();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public CustomerInfo() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 623, 382);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
tabbedPane.setBounds(10, 11, 593, 327);
contentPane.add(tabbedPane);
JPanel panel = new JPanel();
tabbedPane.addTab("Profile", null, panel, null);
panel.setLayout(null);
JLabel lblFirstName = new JLabel("First Name:");
lblFirstName.setBounds(26, 26, 65, 14);
panel.add(lblFirstName);
textFieldFirstName = new JTextField();
textFieldFirstName.setBounds(92, 23, 86, 20);
panel.add(textFieldFirstName);
textFieldFirstName.setColumns(10);
JLabel lblAdress = new JLabel("Adress:");
lblAdress.setBounds(26, 51, 46, 14);
panel.add(lblAdress);
JLabel lblDOB = new JLabel("Date of Birth:");
lblDOB.setBounds(26, 155, 76, 14);
panel.add(lblDOB);
JLabel lblRelationship = new JLabel("Relationship Status:");
lblRelationship.setBounds(310, 186, 96, 14);
panel.add(lblRelationship);
JLabel lblEmail = new JLabel("E-mail:");
lblEmail.setBounds(26, 211, 46, 14);
panel.add(lblEmail);
JLabel lblPhone = new JLabel("Phone Number:");
lblPhone.setBounds(310, 211, 76, 14);
panel.add(lblPhone);
JLabel lblLastName = new JLabel("Last Name:");
lblLastName.setBounds(204, 26, 65, 14);
panel.add(lblLastName);
textFieldLastName = new JTextField();
textFieldLastName.setBounds(270, 23, 86, 20);
panel.add(textFieldLastName);
textFieldLastName.setColumns(10);
JLabel lblCityAdress = new JLabel("City:");
lblCityAdress.setBounds(26, 76, 46, 14);
panel.add(lblCityAdress);
JLabel lblStateAdress = new JLabel("State:");
lblStateAdress.setBounds(26, 101, 46, 14);
panel.add(lblStateAdress);
JLabel lblZipCode = new JLabel("Zip Code:");
lblZipCode.setBounds(26, 126, 46, 14);
panel.add(lblZipCode);
textFieldAdress = new JTextField();
textFieldAdress.setBounds(92, 48, 264, 20);
panel.add(textFieldAdress);
textFieldAdress.setColumns(10);
textFieldCity = new JTextField();
textFieldCity.setBounds(92, 73, 86, 20);
panel.add(textFieldCity);
textFieldCity.setColumns(10);
textFieldZipCode = new JTextField();
textFieldZipCode.setBounds(92, 123, 86, 20);
panel.add(textFieldZipCode);
textFieldZipCode.setColumns(10);
JComboBox comboBoxState = new JComboBox();
comboBoxState.setModel(new DefaultComboBoxModel(new String[] {"Al", "AK", "AZ", "AR", "CA", "CO", "CT", "DE", "FL", "GA", "HI", "ID", "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MD", "MA", "MI", "MN", "MS", "MO", "MT", "NE", "NV", "NH", "NJ", "NM", "NY", "NC", "ND", "OH", "OK", "OR", "PA", "RI", "SC", "SD", "TN", "TX", "UT", "VT", "VA", "WA", "WV", "WI", "WY"}));
comboBoxState.setBounds(92, 98, 46, 20);
panel.add(comboBoxState);
JComboBox comboBoxDBMonth = new JComboBox();
comboBoxDBMonth.setModel(new DefaultComboBoxModel(new String[] {"01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12"}));
comboBoxDBMonth.setBounds(92, 152, 46, 20);
panel.add(comboBoxDBMonth);
JComboBox comboBoxDBDay = new JComboBox();
comboBoxDBDay.setModel(new DefaultComboBoxModel(new String[] {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31"}));
comboBoxDBDay.setBounds(141, 152, 37, 20);
panel.add(comboBoxDBDay);
JComboBox comboBoxDBYear = new JComboBox();
comboBoxDBYear.setBounds(182, 152, 65, 20);
panel.add(comboBoxDBYear);
textFieldEmail = new JTextField();
textFieldEmail.setBounds(92, 208, 130, 20);
panel.add(textFieldEmail);
textFieldEmail.setColumns(10);
JComboBox comboRelationshipStatus = new JComboBox();
comboRelationshipStatus.setModel(new DefaultComboBoxModel(new String[] {"Married", "Single", "Divorced", "Widowed", "Domestic Partners"}));
comboRelationshipStatus.setBounds(422, 183, 86, 20);
panel.add(comboRelationshipStatus);
textFieldNumber = new JTextField();
textFieldNumber.setBounds(422, 208, 122, 20);
panel.add(textFieldNumber);
textFieldNumber.setColumns(10);
Statement stmt = null;
Connection connection=null;
connection=sqliteConnection.dbConnector();
try{
Class.forName("org.sqlite.JDBC");
Connection conn=DriverManager.getConnection("jdbc:sqlite:C:\\Users\\Gregory\\workspacefinal\\Customer.sqlite");
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT FirstName, LastName, Adress, City, ZipCode, Email, PhoneNumber, Age FROM CustomerInfo WHERE Username = username");
String firstName = rs.getString("FirstName");
String lastName = rs.getString("LastName");
String adress = rs.getString("Adress");
String city = rs.getString("City");
String zipcode = rs.getString("ZipCode");
String email = rs.getString("Email");
String phonenumber = rs.getString("PhoneNumber");
String age = rs.getString("Age");
textFieldFirstName.setText(firstName);
textFieldLastName.setText(lastName);
textFieldAdress.setText(adress);
textFieldCity.setText(city);
textFieldZipCode.setText(zipcode);
textFieldEmail.setText(email);
textFieldNumber.setText(phonenumber);
textFieldAge.setText(age);
stmt.close();
conn.close();
}
catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
答案 0 :(得分：1)
首先，CustomerInfo看起来比名称所暗示的更多。它正在扩展JFrame，这意味着它是视图的一部分。您应该在班级名称中反映这一点。
考虑将用户名传递给CustomerInfo的构造函数。
答案 1 :(得分：1)
这种gui逻辑和应用逻辑的混合非常糟糕。
您的主要功能应按如下方式构建：
LoginInfo类中返回它们以保存用户名和密码。CustomerInfo类中返回此信息以保存该信息。 （不要调用对话框CustomerInfo。对话框应调用CustomerInfoDialog。）返回null而不是实际的LoginInfo或CustomerInfo对象的gui函数意味着用户已取消。