用Java写的一个类似QQ登陆界面的程序 Java QQ登陆界面

来源：互联网发布：xp编程器使用说明编辑：程序博客网时间：2024/04/29 16:24
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); }}
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