一、实验目的
? ? ? ??学习使用组件类；学习使用布局类；学习Java的事件处理模式及各种事件的处理。
二、实验内容
? ? ? ??实现如图所示的注册窗口和登录窗口，在注册窗口中填写好注册信息，点击注册按钮，将切换到登录窗口，在登录窗口中输入用户名和密码，如果用户名和密码与注册时输入的一致则弹出登录成功对话框，否则弹出登录失败对话框。
? ? ? ? 思考：修改程序，将注册信息保存到文件，登录时，输入的用户名和密码与保存的一致则弹出登录成功对话框，否则弹出登录失败对话框。
三、代码实现
//登录界面
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
public class LoginFrame extends JFrame {
public LoginFrame() {
init();
}
public void init() {
JFrame frame = new JFrame("登录窗口");
frame.setBounds(400, 100, 480, 410);
frame.setLayout(null);
Font font = new Font("Serief", Font.BOLD, 18);
Label lb_username = new Label("用户名：");
lb_username.setBounds(100, 76, 76, 20);
lb_username.setFont(font);
JTextField jtf_username = new JTextField();
jtf_username.setBounds(199, 73, 127, 30);
jtf_username.setFont(font);
frame.add(lb_username);
frame.add(jtf_username);
Label lb_password = new Label("密码：");
lb_password.setBounds(100, 143, 76, 20);
lb_password.setFont(font);
JPasswordField jpf_password = new JPasswordField();
jpf_password.setBounds(199, 140, 127, 30);
jpf_password.setFont(font);
frame.add(lb_password);
frame.add(jpf_password);
JButton btn_login = new JButton("login");
btn_login.setBounds(190, 220, 80, 40);
btn_login.setFont(font);
btn_login.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String username = jtf_username.getText().trim();
String password = String.valueOf(jpf_password.getPassword());
File file = new File("./user.txt");
boolean result = false;
if (file.exists()) {
try {
BufferedReader bfr = new BufferedReader(new FileReader(file));
String curLine = null;
while ((curLine = bfr.readLine()) != null) {
System.out.println(curLine);
String[] infos = curLine.split("---");
if (username.equals(infos[0]) && password.equals(infos[1])) {
result = true;
break;
}
}
bfr.close();
if (result) {
frame.setVisible(false);
JOptionPane.showMessageDialog(null, "登录成功！", "登录成功", JOptionPane.INFORMATION_MESSAGE);
} else {
JOptionPane.showMessageDialog(null, "登录失败！", "登录失败", JOptionPane.ERROR_MESSAGE);
}
} catch (Exception ep) {
ep.printStackTrace();
}
} else {
JOptionPane.showMessageDialog(null, "登录失败！", "登录失败", JOptionPane.ERROR_MESSAGE);
}
}
});
frame.add(btn_login);
frame.setVisible(true);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
//注册界面
import javafx.scene.control.ComboBox;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
public class RegisterFrame {
public RegisterFrame() {
init();
}
public void init() {
JFrame frame = new JFrame("注册窗口");
frame.setLayout(new FlowLayout(FlowLayout.LEFT, 50, 30));
frame.setBounds(400, 100, 760, 600);
Font font = new Font("Serief", Font.BOLD, 18);
JPanel row1 = new JPanel(new FlowLayout(FlowLayout.LEFT, 20, 5));
Label lb_username = new Label("用户名：");
lb_username.setSize(76, 20);
lb_username.setFont(font);
row1.add(lb_username);
JTextField jtf_username = new JTextField();
jtf_username.setPreferredSize(new Dimension(140, 30));
jtf_username.setFont(font);
row1.add(jtf_username);
Label lb_password = new Label("密码：");
lb_password.setSize(66, 20);
lb_password.setFont(font);
row1.add(lb_password);
JPasswordField jpf_password = new JPasswordField();
jpf_password.setPreferredSize(new Dimension(140, 30));
jpf_password.setFont(font);
row1.add(jpf_password);
JPanel row2 = new JPanel(new FlowLayout(FlowLayout.LEFT, 20, 5));
Label lb_sex = new Label("性别：");
lb_sex.setSize(66, 20);
lb_sex.setFont(font);
row2.add(lb_sex);
ButtonGroup rbtgp = new ButtonGroup();
JRadioButton rb1 = new JRadioButton("男");
rb1.setFont(font);
rb1.setSelected(true);
JRadioButton rb2 = new JRadioButton("女");
rb2.setFont(font);
rbtgp.add(rb1);
rbtgp.add(rb2);
row2.add(rb1);
row2.add(rb2);
Label lb_hobby = new Label("爱好：");
lb_hobby.setSize(66, 20);
lb_hobby.setFont(font);
row2.add(lb_hobby);
JCheckBox cb1 = new JCheckBox("音乐");
cb1.setFont(font);
JCheckBox cb2 = new JCheckBox("国内旅游");
cb2.setFont(font);
JCheckBox cb3 = new JCheckBox("阅读");
cb3.setFont(font);
row2.add(cb1);
row2.add(cb2);
row2.add(cb3);
JPanel row3 = new JPanel(new FlowLayout(FlowLayout.LEFT, 20, 5));
Label lb_job = new Label("职业：");
lb_job.setSize(66, 20);
lb_job.setFont(font);
row3.add(lb_job);
JComboBox<String> cb_job = new JComboBox<>();
cb_job.setFont(font);
cb_job.setEnabled(true);
cb_job.addItem("学生");
cb_job.addItem("企业员工");
cb_job.addItem("教师");
row3.add(cb_job);
Label lb_note = new Label("Note：");
lb_note.setSize(66, 20);
lb_note.setFont(font);
row3.add(lb_note);
JTextArea ta_note = new JTextArea(10,10);
ta_note.setFont(font);
row3.add(ta_note);
JButton btn_register = new JButton("register");
btn_register.setFont(font);
btn_register.setPreferredSize(new Dimension(130, 35));
btn_register.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String username = jtf_username.getText().trim();
String password = String.valueOf(jpf_password.getPassword()).trim();
if (username.equals("") || password.equals("")) {
JOptionPane.showMessageDialog(null, "用户名或密码不能为空！", "注册失败", JOptionPane.WARNING_MESSAGE);
return;
}
try {
File file = new File("./user.txt");
// 创建文件
file.createNewFile();
//将用户信息写入文件中
FileWriter fw = new FileWriter(file, true);
String content = username + "---" + password + "\n";
fw.write(content);
fw.close();
// 跳转到登录界面
frame.setVisible(false);
new LoginFrame();
} catch (Exception ep) {
ep.printStackTrace();
}
}
});
row3.add(btn_register);
frame.add(row1);
frame.add(row2);
frame.add(row3);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
//主程序
public class Test5 {
public static void main(String[] args) {
new RegisterFrame();
}
}
四、运行结果
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