denglu.java

秩序更改试题库

//导入所必须的包↓
import java.io.*;
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.BoxLayout.*;
import javax.swing.JOptionPane;
import java.io.FileOutputStream;
//导入所必须的包↑

public class Denglu  extends Dialog implements ActionListener  {
    Label nameLabel,passLabel;
    TextField nameText,passText;
    Button Bdenglu,Bquxiao;
    public String bb;
    public Denglu(Frame f,String s,boolean b) {
        super(f,"       "+s,true);
        setBounds(300,300,260,140);
        nameLabel=new  Label("用户名：");
        passLabel=new  Label("密　码：");
        nameText=new TextField(20);
        passText=new TextField(20);
        Bdenglu=new Button("登录");

        Bquxiao=new Button("取消");
        setLayout(new FlowLayout());
        add(nameLabel);
        add(nameText);
        add(passLabel);
        add(passText);


        passText.setEchoChar('*');
        add(Bdenglu);Bdenglu.addActionListener(this);
        add(Bquxiao);Bquxiao.addActionListener(this);
        setVisible(true);
    }
    public String getMessage()
    {
        return bb;
    }

    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==Bdenglu)//用户单击【登录】按钮
        {
            File jilu= new File("data.txt");
            try {
                BufferedReader Readline= new BufferedReader(new FileReader(jilu));
                String Jiu=null,all;
                Jiu=Readline.readLine();
                StringTokenizer fenjie=new StringTokenizer(Jiu,"#");
                String get[] =new String[200];
                int i=0;
                all=nameText.getText() +" "+ passText.getText();
                while(fenjie.hasMoreTokens())
                {
                    get[i]=fenjie.nextToken();
                    if(all.equals(get[i]))
                    {
                        this.setVisible(false);
                        bb=nameText.getText();
                        JOptionPane.showMessageDialog(this,bb
                                +"登录成功！单击【确定】查看您的现有成绩！");
                    }
                    i++;
                }
            } catch (IOException IOe) {}
        }
        if(e.getSource()==Bquxiao)
        {
            setVisible(false);
        }
    }
}