尝试制作一个登录页面,我卡住了! [java]

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英文:

Trying to make a login page, I am stuck! [java]

问题

这是我的代码,我想要做的是,当点击登录按钮时,希望它检查密码和文本字段中的密码是否正确(在if语句中找到)。我需要帮助获取文本字段和密码字段中的输入。当我运行代码时,它直接跳转到else语句并执行其中的代码,我希望它执行if语句,因为我已经输入了正确的用户名和密码。我试图弄清楚如何从文本字段获取输入,但我不知道该怎么做。我会感激一些帮助,谢谢。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class GUI_2 implements ActionListener {

    private JLabel PassLabel;
    private JFrame frame;
    private JButton enterButton;
    private JLabel UserLabel;
    private JLabel label;
    private JPanel panel;
    private JFrame Incorrect;
    private JTextField password;
    private JTextField username;
    private String rightPassword;
    private String rightUsername;
    private String passwordInput;
    private String usernameInput;
    private JButton UsernameEnter;
    private JButton PasswordEnter;
    private final static String newline = "\n";
    private TextArea textArea;

    public GUI_2() {
        PassLabel = new JLabel("Enter Password:");
        password = new JPasswordField(11);
        UserLabel = new JLabel("Enter Username:");
        username = new JTextField(11);
        enterButton = new JButton("Login");
        label = new JLabel("Access");
        UsernameEnter = new JButton("Enter");
        PasswordEnter = new JButton("Enter");
        frame = new JFrame();
        panel = new JPanel();
        Incorrect = new JFrame();
        enterButton.addActionListener(this);

        panel.setBorder(BorderFactory.createEmptyBorder(200, 200, 60, 300));
        panel.setLayout(new GridLayout(5, 5));
        panel.add(UserLabel);
        panel.add(username);
        panel.add(PassLabel);
        panel.add(password);
        panel.add(label);
        panel.add(enterButton);

        frame.add(panel, BorderLayout.CENTER);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("Password Login");
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        new GUI_2();
        // TODO Auto-generated method stub
    }

    public void actionPerformed(ActionEvent arg0) {
        // 获取文本字段中的输入
        usernameInput = username.getText();
        passwordInput = new String(password.getPassword());

        if (passwordInput.equals("password") && usernameInput.equals("harry")) {
            frame.setTitle("Success");
            label.setForeground(Color.green);
            label.setText("Access granted");
        } else {
            frame.setTitle("Access Denied");
            label.setForeground(Color.red);
            label.setText("Access Denied");
        }
    }
}

我已经将代码中获取文本字段和密码字段输入的部分进行了更新。

英文:

Here is my code and what I want to do is, when the login button is pressed, I would like it to check the password and text fields for the right password(found in the if statement). I need help on what to do to get the input from the text and password fields. When I run the code, it skips right to the else statement and does the code in there, I want it to do the if statement as I have entered the right username and password. I was trying to figure out how to get input from the text fields but I don't know how to. I would appreciate some help, thank you.

    import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class GUI_2 implements ActionListener {
private JLabel PassLabel;
private JFrame frame;
private JButton enterButton;
private JLabel UserLabel;
private JLabel label;
private JPanel panel;
private JFrame Incorrect;
private JTextField password;
private JTextField username;
private String rightPassword;
private String rightUsername;
private String passwordInput;
private String usernameInput;
private JButton UsernameEnter;
private JButton PasswordEnter;
private final static String newline = "\n";
private TextArea textArea;
public GUI_2()
{
PassLabel = new JLabel("Enter Password:");
password = new JPasswordField(11);
UserLabel = new JLabel("Enter Username:");
username = new JTextField(11);
enterButton = new JButton("Login");
label = new JLabel("Access");
UsernameEnter = new JButton("Enter");
PasswordEnter = new JButton("Enter");
frame = new JFrame();
panel = new JPanel();
Incorrect = new JFrame();
enterButton.addActionListener(this);
panel.setBorder(BorderFactory.createEmptyBorder(200,200,60,300));
panel.setLayout(new GridLayout(5, 5));
panel.add(UserLabel);
panel.add(username);
panel.add(PassLabel);
panel.add(password);
panel.add(label);
panel.add(enterButton);
frame.add(panel, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Password Login");
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
new GUI_2();
// TODO Auto-generated method stub
}
public void actionPerformed(ActionEvent arg0)
{
if (passwordInput == "password" && usernameInput == "harry")
{
frame.setTitle("Success");
label.setForeground(Color.green);
label.setText("Access granted");
}
else
{
frame.setTitle("Access Denied");
label.setForeground(Color.red);
label.setText("Access Denied");
}
}
}

答案1

得分: 1

1: 你可以通过以下方式获取输入密码:password.getText()

2: 你应该使用 "equals" 来比较两个字符串 passwordInput.equals("password")

所以修改 actionPerformed 方法如下:

    public void actionPerformed(ActionEvent arg0) {

        passwordInput = password.getText();
        usernameInput = username.getText();
        if (passwordInput != null
                && usernameInput != null
                && passwordInput.equals("password")
                && usernameInput.equals("harry")) {
            frame.setTitle("Success");
            label.setForeground(Color.green);
            label.setText("Access granted");
        } else {
            frame.setTitle("Access Denied");
            label.setForeground(Color.red);
            label.setText("Access Denied");
        }
    }
英文:

1: you can get the input password with: password.getText()

2: you should use "equals" compare two string passwordInput.equals("password")

so modify the actionPerformed method like this:

    public void actionPerformed(ActionEvent arg0) {

        passwordInput = password.getText();
        usernameInput = username.getText();
        if (passwordInput != null
                && usernameInput != null
                && passwordInput.equals("password")
                && usernameInput.equals("harry")) {
            frame.setTitle("Success");
            label.setForeground(Color.green);
            label.setText("Access granted");
        } else {
            frame.setTitle("Access Denied");
            label.setForeground(Color.red);
            label.setText("Access Denied");
        }
    }

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  • 本文由 发表于 2020年8月4日 19:36:36
  • 转载请务必保留本文链接:https://go.coder-hub.com/63246065.html
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