gridbaglayoutload.java

java图书销售系统。。。。。。。。。。。。。。。。。。。。

import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;





public class GridBagLayoutLoad extends JFrame{
	/**
	 * 
	 */
	
	private static final long serialVersionUID = 1L;
	private JFrame frame = new JFrame();
	private JLabel labload=new JLabel("用  户");
	private JTextField txtload=new JTextField(10);
	private JLabel labpwd=new JLabel("密  码");
	private JPasswordField txtpwd=new JPasswordField(10);
	JButton btnOk=new JButton("登  陆");
	JButton btnCancel=new JButton("取  消");
	private String name = "taoge";
	private String password = "007"; 
	public GridBagLayoutLoad(){
		//面板p中显示登陆信息
		JPanel p=new JPanel();
		p.setBorder(BorderFactory.createLoweredBevelBorder());
		p.setLayout(new GridBagLayout());
		LayoutUtil.add(p,GridBagConstraints.NONE,GridBagConstraints.CENTER,0,0,0,0,1,1,labload);
		LayoutUtil.add(p,GridBagConstraints.NONE,GridBagConstraints.CENTER,1,0,1,0,1,1,txtload);
		LayoutUtil.add(p,GridBagConstraints.NONE,GridBagConstraints.CENTER,0,0,0,1,1,1,labpwd);
		LayoutUtil.add(p,GridBagConstraints.NONE,GridBagConstraints.CENTER,1,0,1,1,1,1,txtpwd);
		getContentPane().add(p,BorderLayout.CENTER);
		//面板aP中显示两个按钮
		JPanel ap=new JPanel();
		ap.setLayout(new GridBagLayout());
		LayoutUtil.add(ap,GridBagConstraints.NONE,GridBagConstraints.CENTER,0,0,0,0,1,1,btnOk);
		btnOk.addActionListener(new action());
		LayoutUtil.add(ap,GridBagConstraints.NONE,GridBagConstraints.CENTER,0,0,1,0,1,1,btnCancel);
		btnCancel.addActionListener(new action());
		getContentPane().add(ap,BorderLayout.SOUTH);
		
		
	}
	
	class action implements ActionListener{

		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub
		    if(e.getActionCommand()=="登  陆"){
		    	if(txtload.getText().equals("")||txtpwd.getPassword().equals("")){
		    		String message = "用户名或密码不能为空！";
					JOptionPane.showMessageDialog(null,message);
		    	}
		    	else if(txtload.getText().equals(name)||txtpwd.getPassword().equals(password)){
		    		SellBooks1 f = new SellBooks1();
		    		f.launchFrame();
		    		frame.setVisible(false);
		    			
		    	}
		    }
		  else if(e.getActionCommand()=="取  消"){
				System.exit(0);
			}
		}
		
	}
	 public static void main(String []args){
		 GridBagLayoutLoad window=new GridBagLayoutLoad();
		      window.setTitle("登    陆");
		 	  window.setSize(250,150);
              window.show();
	  }
}