loginframe.java

JAVA编写的登陆窗体

package loginexample;

import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Rectangle;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JButton;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JOptionPane;

public class LoginFrame extends JFrame {
    JPanel contentPane;
    JLabel jLabel1 = new JLabel();
    JLabel jLabel2 = new JLabel();
    JTextField jTextField1 = new JTextField();
    JPasswordField jPasswordField1 = new JPasswordField();
    JButton jButton1 = new JButton();
    JButton jButton2 = new JButton();
    JOptionPane jOptionPane1 = new JOptionPane();
    ///

    int i;
    public LoginFrame() {
        try {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    /**
     * Component initialization.
     *
     * @throws java.lang.Exception
     */
    private void jbInit() throws Exception {
        contentPane = (JPanel) getContentPane();
        contentPane.setLayout(null);
        setSize(new Dimension(306, 196));
        setTitle("登陆窗体");
        jLabel1.setText("姓名：");
        jLabel1.setBounds(new Rectangle(33, 43, 42, 15));
        jLabel2.setText("密码：");
        jLabel2.setBounds(new Rectangle(33, 93, 42, 15));
        jTextField1.setBounds(new Rectangle(118, 43, 115, 21));
        jPasswordField1.setBounds(new Rectangle(118, 91, 115, 25));
        jButton1.setBounds(new Rectangle(35, 146, 83, 25));
        jButton1.setMnemonic('A');
        jButton1.setText("确定(A)");
        jButton1.addActionListener(new LoginFrame_jButton1_actionAdapter(this));
        jButton2.setBounds(new Rectangle(154, 145, 83, 25));
        jButton2.setMnemonic('C');
        jButton2.setText("取消(C)");
        contentPane.add(jLabel1);
        contentPane.add(jLabel2);
        contentPane.add(jTextField1);
        contentPane.add(jPasswordField1);
        contentPane.add(jButton1);
        contentPane.add(jButton2);
    }

    public void jButton1_actionPerformed(ActionEvent e) {
        String strname = jTextField1.getText().trim();
        char c[] = jPasswordField1.getPassword();
        String strpass = new String(c);

//        if(strname.equals("aaa"))
        if (strname.length() == 0 || strpass.length() == 0) {
            jOptionPane1.showMessageDialog(this, "用户名或密码不能为空！", "错误提示",
                                           JOptionPane.INFORMATION_MESSAGE);

        } else {
            if (strname.equals("abc") && strpass.equals("123")) {
                jOptionPane1.showMessageDialog(this, "登陆成功", "提示",
                                               JOptionPane.INFORMATION_MESSAGE);
                MainFrame mf=new MainFrame();
                mf.setLocation(100,100);
                mf.setSize(600,500);
                mf.setVisible(true);

                this.dispose();

            } else {
                jOptionPane1.showMessageDialog(this, "用户名或密错误！", "错误提示",
                                               JOptionPane.INFORMATION_MESSAGE);

                if(i>=2)
                {
                    System.exit(0);
                }
                i++;
            }
            jTextField1.setText("");
            jPasswordField1.setText("");
        }
    }
}


class LoginFrame_jButton1_actionAdapter implements ActionListener {
    private LoginFrame adaptee;
    LoginFrame_jButton1_actionAdapter(LoginFrame adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.jButton1_actionPerformed(e);
    }
}