【发布时间】：2013-12-11 18:48:23
【问题描述】：
我尝试用 Java 实现一个注册表单。我的主框架由 3 个按钮组成：登录、注册、下订单，我有 setEnabled(false)。如果用户想要登录（意味着他已经拥有一个帐户）并且他提供了正确的 id 和 psw，我希望隐藏登录框架并显示我的主框架，并且这次启用了下订单按钮。这是我的第一个问题。我的第二个问题是在注册时我无法将用户的输入保存在 ArrayList<User> 中。
MainFrame.java：
public class MainFrame extends JFrame {
private JButton loginButton;
private JButton signUpButton;
JButton placeOrderButton;
private boolean q;
private UserManager userManager;
public MainFrame(){
super("Main Panel");
userManager = new UserManager();
loginButton = new JButton("Login");
loginButton.addActionListener(new LoginButtonListener());
placeOrderButton = new JButton("Place Order");
placeOrderButton.addActionListener(new PlaceOrderButtonListener());
placeOrderButton.setEnabled(false);
signUpButton = new JButton("Sign Up");
signUpButton.addActionListener(new SignUpButtonListener());
this.getContentPane().add(loginButton, BorderLayout.LINE_START);
this.getContentPane().add(signUpButton, BorderLayout.CENTER);
this.getContentPane().add(placeOrderButton, BorderLayout.LINE_END);
this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
class LoginButtonListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent arg0) {
new LoginFrame(userManager);
}
}
class SignUpButtonListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent arg0) {
new SignUpFrame(userManager);
}
}
class PlaceOrderButtonListener implements ActionListener {
public void actionPerformed(ActionEvent argO){
}
}
用户.java：
public class User {
private String fullName;
private String email;
private String userID;
private String password;
public User(String fullName, String email, String userID, String password) {
this.fullName = fullName;
this.email = email;
this.userID = userID;
this.password = password;
}
public String getFullName() {
return fullName;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getUserID() {
return userID;
}
public void setUserID(String userID) {
this.userID = userID;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
LoginFrame.java：
public class LoginFrame extends JFrame{
private JButton loginButton;
private JTextField usernameField;
private JPasswordField password;
private UserManager userManager;
public LoginFrame(UserManager userManager){
super("Enter your credentials to login");
this.userManager = userManager;
loginButton = new JButton("Login");
loginButton.addActionListener(new LoginButtonListener());
usernameField = new JTextField(15);
password = new JPasswordField(15);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new GridLayout(3,2));
mainPanel.add(new JLabel("Username:"));
mainPanel.add(usernameField);
mainPanel.add(new JLabel("Password:"));
mainPanel.add(password);
mainPanel.add(loginButton);
this.setContentPane(mainPanel);
this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
class LoginButtonListener implements ActionListener{
public void actionPerformed(ActionEvent arg0) {
String givenID = usernameField.getText();
if(userManager.isUserInList(givenID)){
String givenPass = password.getText();
User theUser = userManager.getUserWithID(givenID);
if(givenPass.equals(theUser.getPassword())){
JOptionPane.showMessageDialog(null, "Access granted!");
dispose();
new MainFrame();
}
else{
JOptionPane.showMessageDialog(null,
"Wrong Password",
"Error!",
JOptionPane.ERROR_MESSAGE);
}
}
else{
JOptionPane.showMessageDialog(null,
"Wrong username",
"Error!",
JOptionPane.ERROR_MESSAGE);
}
}
}
SignUpFrame.java：
public class SignUpFrame extends JFrame{
private JButton signupButton;
private JTextField name;
private JTextField email;
private JTextField username;
private JPasswordField pass;
private UserManager userManager;
public SignUpFrame (UserManager userManager){
super("Please fill in your Data");
userManager = new UserManager();
signupButton = new JButton("Sign Up!");
signupButton.addActionListener(new signupButtonListener());
JTextField name = new JTextField(15);
JTextField email = new JTextField(15);
JTextField username = new JTextField(15);
JTextField pass = new JTextField(15);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new GridLayout(5,2));
mainPanel.add(new JLabel("Name:"));
mainPanel.add(name);
mainPanel.add(new JLabel("Email:"));
mainPanel.add(email);
mainPanel.add(new JLabel("Username"));
mainPanel.add(username);
mainPanel.add(new JLabel("Password:"));
mainPanel.add(pass);
mainPanel.add(signupButton);
this.setContentPane(mainPanel);
this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
class signupButtonListener implements ActionListener{
public void actionPerformed(ActionEvent arg0) {
User u2 = new User(name.getText(),email.getText(),username.getText(),pass.getText());
add(u2);
}
}
导入 java.util.ArrayList;
公共类用户管理器{
private ArrayList<User> userList;
public UserManager(){
userList = new ArrayList<User>();
User u1 = new User("Teo Haik", "teo@uom.gr","teohaik","teopass");
userList.add(u1);
}
public boolean isUserInList(String ID){
for(User u: userList){
if(u.getUserID().equals(ID)){
return true;
}
}
return false;
}
public User getUserWithID(String ID){
for(User u: userList){
if(u.getUserID().equals(ID)){
return u;
}
}
return null;
}
【问题讨论】：
-
请发布您尝试过的代码。
-
发布sscce.org 以获得快速帮助
-
你能告诉我们一些你的代码吗？你有存储数据的问题吗？或从字段中获取数据？究竟是什么问题我无法将用户输入保存到数组列表中 .. 为什么？原因？修改您的问题，以便我们提供更好的答案。字段中的 GetText 将其放入一个字符串中，使用分隔符并将该数据放入 arraylist 应该没有问题
-
我做了所有需要的更改
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附带问题：什么是 UserManeger 类？是预定义的还是你自己做的