seachflightpanel.java

老师给的在线航班系统

package com.toa.abs.cui;

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;



/**
 * 查询航班面板
 * @author tangliang
 *
 */
public class SeachFlightPanel extends JPanel implements ActionListener{
	private JLabel message;//显示当前用户信息
	private JLabel label1;//查询航班：
	private JLabel label2;//出发地：
	private JTextField fromAddress;//文本框
	private JLabel label3;//目的地：
	private JTextField toAddress;//文本框
	private JLabel label4;//日期：
	private JTextField date;//文本框
	private JButton button;//查询按钮
	
	public SeachFlightPanel(){
		message=new JLabel();
		message.setForeground(Color.RED);
		label1=new JLabel("查询航班：");
		label2=new JLabel("出发地：");
		fromAddress=new JTextField(8);
		label3=new JLabel("目的地：");
		toAddress=new JTextField(8);
		label4=new JLabel("日期：");
		date=new JTextField(12);
		button=new JButton("查询");
		init();
		eventHandle();
	}
	
	/**
	 * 该方法用于构造图形界面.
	 *
	 */
	private void init(){
		GridBagLayout gbl=new GridBagLayout();
		GridBagConstraints constraints=new GridBagConstraints();
		this.setLayout(gbl);
		
		buildConstraints(constraints,0,0,1,1,10,100);
		constraints.fill=GridBagConstraints.NONE;
		constraints.anchor=GridBagConstraints.EAST;
		gbl.setConstraints(label1,constraints);
		this.add(label1);
		
		buildConstraints(constraints,1,0,1,1,10,100);
		constraints.fill=GridBagConstraints.NONE;
		constraints.anchor=GridBagConstraints.EAST;
		gbl.setConstraints(label2,constraints);
		this.add(label2);
		
		buildConstraints(constraints,2,0,1,1,20,100);
		constraints.fill=GridBagConstraints.BOTH;
		constraints.anchor=GridBagConstraints.CENTER;
		gbl.setConstraints(fromAddress,constraints);
		this.add(fromAddress);
		
		buildConstraints(constraints,3,0,1,1,10,100);
		constraints.fill=GridBagConstraints.NONE;
		constraints.anchor=GridBagConstraints.EAST;
		gbl.setConstraints(label3,constraints);
		this.add(label3);
		
		buildConstraints(constraints,4,0,1,1,20,100);
		constraints.fill=GridBagConstraints.BOTH;
		constraints.anchor=GridBagConstraints.CENTER;
		gbl.setConstraints(toAddress,constraints);
		this.add(toAddress);
		
		buildConstraints(constraints,5,0,1,1,10,100);
		constraints.fill=GridBagConstraints.NONE;
		constraints.anchor=GridBagConstraints.EAST;
		gbl.setConstraints(label4,constraints);
		this.add(label4);
		
		buildConstraints(constraints,6,0,1,1,20,100);
		constraints.fill=GridBagConstraints.BOTH;
		constraints.anchor=GridBagConstraints.CENTER;
		gbl.setConstraints(date,constraints);
		this.add(date);
	
		buildConstraints(constraints,0,2,3,1,0,100);
		constraints.fill=GridBagConstraints.BOTH;
		constraints.anchor=GridBagConstraints.WEST;
		gbl.setConstraints(message,constraints);
		this.add(message);
		
		buildConstraints(constraints,5,2,2,1,0,100);
		constraints.fill=GridBagConstraints.NONE;
		constraints.anchor=GridBagConstraints.CENTER;
		gbl.setConstraints(button,constraints);
		this.add(button);
	}
	
	/**
	 * 该方法为GridBagLayout布局管理器提供每个组件的布局参数。
	 */
	private void buildConstraints(GridBagConstraints cons,int gridx,int gridy,
			int gridwidth,int gridheight,int weightx,int weighty){
		cons.gridx=gridx;
		cons.gridy=gridy;
		cons.gridwidth=gridwidth;
		cons.gridheight=gridheight;
		cons.weightx=weightx;
		cons.weighty=weighty;
	}
	
	
	/**
	 * 该方法设置图形组件的事件监听器。
	 *
	 */
	private void eventHandle(){
		button.addActionListener(this);
	}
	
	/**
	 * 该方法实现事件处理的代码。
	 */
	public void actionPerformed(ActionEvent e) {
		if(e.getActionCommand().equals("查询")){
			if(fromAddress.getText().equals("")||toAddress.getText().equals("")||date.getText().equals("")){
				JOptionPane.showMessageDialog(this,"不能为空！");
				return;
			}
			ArrayList arr=new ArrayList();
			
		}	
	}
}