用Java写的一个类似QQ登陆界面的程序 Java QQ登陆界面

import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.ActionEvent;
import java.io.*;
import javax.swing.*;
import java.awt.Button;
import java.awt.Panel;
import java.lang.String;
import javax.swing.JOptionPane;
public class QQ extends Frame implements ActionListener{
Label Lname ,Lpassword; //定义用户名和密码的标签
TextField Tname; //定义用户名的文本框
JPasswordField Tpassword; //定义密码的文本框。注：使用JPasswordField的好处就是输入的密码是以****显示给用户的
Panel panel1=new Panel(); //定义面板
Button Load,login; //定义登陆和注册的按钮
boolean b=false;
File file1;    //定义记录用户注册的用户名和密码的文件夹
Writer writer;
String []Usersname=new String[1024]; //定义记录用户名的数组
String []Userspassword=new String[1024];//定义记录密码的数组
public QQ(){
Lname=new Label ("用户名");Lname.setBackground(Color.red);//设置标签的背景颜色
Lpassword=new Label ("密码");Lpassword.setBackground(Color.red);//设置标签的背景颜色
Tname=new TextField (10);
Tpassword=new JPasswordField (10);
Load=new Button("登陆");Load.setBackground(Color.lightGray);
login=new Button("注册");login.setBackground(Color.lightGray);
add(panel1,BorderLayout.CENTER);
setLayout(new CardLayout(3,2));
panel1.add(Lname);
panel1.add(Tname);
panel1.add(Lpassword);
panel1.add(Tpassword);
panel1.add(Load);Load.addActionListener(this);
panel1.add(login);login.addActionListener(this);

}
public void actionPerformed(ActionEvent e){
// 用户登录事件处理
if (e.getSource() == Load) {
String name1 = Tname.getText();
String password1 = Tpassword.getText();
boolean flag = false;
int index = 0;
for (int i = 0; i < Usersname.length; i++) {
if (name1.equals(Usersname[i])) {
flag = true;
index = i;
break;
}
}
if (flag && password1.equals(Userspassword[index])) {
//处理用户登录成功后的反馈信息
JOptionPane.showMessageDialog(null, "恭喜您登陆成功!", "消息", JOptionPane.INFORMATION_MESSAGE);
} else {
JOptionPane.showMessageDialog(null, "对不起您的用户名或密码错误!", "错误",JOptionPane.ERROR_MESSAGE);
}
}

// 用户注册模块的事件处理
if (e.getSource() == login) {
String NCmp = Tname.getText();
String PCmp = Tpassword.getText();

boolean flag = false;
for (int i = 0; i < Usersname.length; i++) {
if (NCmp.equals(Usersname[i])) {
flag = true;
break;
}
}
if (flag) {
JOptionPane.showMessageDialog(null, "对不起您的用户名已经注册!", "错误", JOptionPane.ERROR_MESSAGE);
} else {
int index = 0;
JOptionPane.showMessageDialog(null, "注册成功!", "消息", JOptionPane.INFORMATION_MESSAGE);
for (int i = 0; i < Usersname.length; i++) {
if (Usersname[i] == null) {
Usersname[i] = NCmp;
index = i;
break;
}
}
Userspassword[index] = PCmp;
}
try{
file1=new File("Student.dat");
FileWriter fw=new FileWriter(file1,true);
fw.write("用户名"+"\t\t"+"密码"+"\n");
fw.write(NCmp+"\t\t"+PCmp+"\n");
fw.close();
}catch (IOException e1){
e1.printStackTrace();
}
}

}
public static void main(String[] args) {
// TODO Auto-generated method stub
Frame Fstudent=new QQ();
Fstudent.setSize(200,200);
Fstudent.setTitle("QQ");

//   关闭窗口
Fstudent.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
Fstudent.setVisible(true);

}

}