Java实现图形化界面的日历

此程序主要功能实现了可以根据用户选择的年月日来定位日期,日期的旁边用#加以标注

主界面如下:
Java实现图形化界面的日历_第1张图片
代码如下:

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import javax.swing.*;

class awt{
     
	JFrame jf = new JFrame();
	Container con = jf.getContentPane();
	JPanel p_mid = new JPanel();
	JPanel pTime = new JPanel();
	JPanel pTime2 = new JPanel();
	JComboBox<String> box1 = new JComboBox<String>();
	JComboBox<String> box2 = new JComboBox<String>();
	JComboBox<String> box3 = new JComboBox<String>();
	String year, month, day;                            //记录年、月、日
	Calendar ca = Calendar.getInstance();
	public awt() {
     
		//基本设置
		jf.setVisible(true);
		jf.setLocation(300, 300);
		jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE);
		jf.setLayout(new BorderLayout());
		jf.setResizable(false);
		p_mid.setLayout(new GridLayout(7, 7, 1, 1));
		//调用方法
		setTime();
		week();
		Day();
		//自适应窗口大小
		jf.pack();
	}
	
	//下拉列表框监听器
	public class action1 implements ActionListener {
     
		JComboBox<String> bool;
		@Override
		public void actionPerformed(ActionEvent e) {
     
			bool = (JComboBox<String>)e.getSource();
			year = (String)bool.getSelectedItem();
			combox();
		}
		public void combox() {
     
			if(!year.equals("--年份--")) {
     
				String str[] = new String[13];
				str[0] = "--月份--";
				for(int i=1; i<=12; i++) {
     
					str[i] = Integer.toString(i);
				}
				box2.setModel(new DefaultComboBoxModel<String>(str));
			}
		}
	}
	class action2 implements ActionListener{
     
		JComboBox<String> bool;
		String str[];
		@Override
		public void actionPerformed(ActionEvent e) {
     
			bool = (JComboBox<String>)e.getSource();
			month = (String)bool.getSelectedItem();
			combox();
		}
		public void combox() {
     
			if(!month.equals("--月份--") && (month.matches("[13578]") || month.equals("10") || month.equals("12"))) {
     
				str = new String[32];
				str[0] = "--日期--";
				for(int i=1; i<=31; i++) {
     
					str[i] = Integer.toString(i);
				}
				box3.setModel(new DefaultComboBoxModel<String>(str));
			}else if(!month.equals("--月份--") && (month.matches("[469]") || month.equals("11"))){
     
				str = new String[31];
				str[0] = "--日期--";
				for(int i=1; i<=30; i++) {
     
					str[i] = Integer.toString(i);
				}
				box3.setModel(new DefaultComboBoxModel<String>(str));
			}else if(!month.equals("--月份--") && month.equals("2")) {
     
				//判断为闰年还是平年
				if(Integer.parseInt(year)%4==0 && Integer.parseInt(year)%100!=0) {
     
					//进入此循环,则为闰年,2月份有29天
					str = new String[30];
					str[0] = "--日期--";
					for(int i=1; i<=29; i++) {
     
						str[i] = Integer.toString(i);
					}
					box3.setModel(new DefaultComboBoxModel<String>(str));
				}else {
     
					//进入此循环,则为平年,2月份有28天
					str = new String[29];
					str[0] = "--日期--";
					for(int i=1; i<=28; i++) {
     
						str[i] = Integer.toString(i);
					}
					box3.setModel(new DefaultComboBoxModel<String>(str));
				}
			}
		}
	} 
	class action3 implements ActionListener{
     
		JComboBox<String> bool;
		@Override
		public void actionPerformed(ActionEvent e) {
     
			bool = (JComboBox<String>)e.getSource();
			day = (String)bool.getSelectedItem();
		}
		
	}
	class action4 extends JComponent implements ActionListener{
     
		@Override
		public void actionPerformed(ActionEvent e) {
     
			//实现方法
			if(!year.equals("--年份--") && !month.equals("--月份--") && !day.equals("--日期--")) {
     
				//移除组件
				con.remove(p_mid);
				p_mid.removeAll();
				//实现方法
				Week_new();
				Day_new();
			}
		}
		//新的星期组件
		public void Week_new() {
     
			JButton lab1 = new JButton("一");
			JButton lab2 = new JButton("二");
			JButton lab3 = new JButton("三");
			JButton lab4 = new JButton("四");
			JButton lab5 = new JButton("五");
			JButton lab6 = new JButton("六");
			JButton lab7 = new JButton("七");
			lab1.setFont(new Font("微软雅黑", Font.BOLD, 15));
			lab2.setFont(new Font("微软雅黑", Font.BOLD, 15));
			lab3.setFont(new Font("微软雅黑", Font.BOLD, 15));
			lab4.setFont(new Font("微软雅黑", Font.BOLD, 15));
			lab5.setFont(new Font("微软雅黑", Font.BOLD, 15));
			lab6.setFont(new Font("微软雅黑", Font.BOLD, 15));
			lab7.setFont(new Font("微软雅黑", Font.BOLD, 15));
			p_mid.add(lab1);
			p_mid.add(lab2);
			p_mid.add(lab3);
			p_mid.add(lab4);
			p_mid.add(lab5);
			p_mid.add(lab6);
			p_mid.add(lab7);
		}
		//新的天数组件
		public void Day_new() {
     
			int temp=1;
			ca.set(Integer.parseInt(year), Integer.parseInt(month)-1, Integer.parseInt(day));
			int Month_max = ca.getActualMaximum(Calendar.DATE);
			int day = ca.get(Calendar.DATE);
			ca.set(Calendar.DATE, 1);
			int Week = ca.get(Calendar.DAY_OF_WEEK)-1;
			if(Week == 0) {
     
				Week = 7;
			}
			for(int i=1; i<=42; i++) {
     
				if(i>=Week && i<Week+Month_max) {
     
					if(temp == day) {
     
						p_mid.add(new Button("#"+temp));
						temp++;
						continue;
					}
					p_mid.add(new Button(Integer.toString(temp)));
					temp++;
					continue;
				}
				p_mid.add(new Button());
			}
			con.add(p_mid, BorderLayout.CENTER);
			con.validate();
		}
	}
	//------//
	public void setTime() {
     
		//声明变量
		JLabel labTime = new JLabel();
		JButton button = new JButton("查询");
		box1.addActionListener(new action1());
		box2.addActionListener(new action2());
		box3.addActionListener(new action3());
		button.addActionListener(new action4());
		Date d = new Date();
		SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd");
		String time = sdf.format(d);
		labTime.setText("北京时间:"+time);
		labTime.setFont(new Font("微软雅黑", Font.BOLD, 15));
		box1.addItem("--年份--");
		box1.addItem("2016");
		box1.addItem("2017");
		box1.addItem("2018");
		box1.addItem("2019");
		box2.addItem("--月份--");
		box3.addItem("--日期--");
		pTime.setLayout(new FlowLayout(FlowLayout.LEFT,20,5));
		pTime2.setLayout(new FlowLayout(FlowLayout.CENTER,1,0));
		pTime.add(labTime);
		pTime2.add(box1);
		pTime2.add(box2);
		pTime2.add(box3);
		pTime2.add(button);
		pTime.add(pTime2);
		con.add(pTime, BorderLayout.NORTH);
	}
	public void week() {
     
		JButton lab1 = new JButton("一");
		JButton lab2 = new JButton("二");
		JButton lab3 = new JButton("三");
		JButton lab4 = new JButton("四");
		JButton lab5 = new JButton("五");
		JButton lab6 = new JButton("六");
		JButton lab7 = new JButton("七");
		lab1.setFont(new Font("微软雅黑", Font.BOLD, 15));
		lab2.setFont(new Font("微软雅黑", Font.BOLD, 15));
		lab3.setFont(new Font("微软雅黑", Font.BOLD, 15));
		lab4.setFont(new Font("微软雅黑", Font.BOLD, 15));
		lab5.setFont(new Font("微软雅黑", Font.BOLD, 15));
		lab6.setFont(new Font("微软雅黑", Font.BOLD, 15));
		lab7.setFont(new Font("微软雅黑", Font.BOLD, 15));
		p_mid.add(lab1);
		p_mid.add(lab2);
		p_mid.add(lab3);
		p_mid.add(lab4);
		p_mid.add(lab5);
		p_mid.add(lab6);
		p_mid.add(lab7);
	}
	public void Day() {
     
		int temp=1;
		int Month_max = ca.getActualMaximum(Calendar.DATE);    //当前月有几天
		int day = ca.get(Calendar.DATE);                       //当前日期
		ca.set(Calendar.DATE, 1);                              
		int Week = ca.get(Calendar.DAY_OF_WEEK)-1;             //星期几
		if(Week == 0) {
     
			Week = 7;
		}
		for(int i=1; i<=42; i++) {
     
			Button b = new Button();
			if(i>=Week && i<Week+Month_max) {
     
				if(temp == day) {
     
					p_mid.add(new Button("#"+temp));
					temp++;
					continue;
				}
				p_mid.add(new Button(Integer.toString(temp)));
				temp++;
				continue;
			}
			p_mid.add(new Button());
		}
		con.add(p_mid, BorderLayout.CENTER);
	}
}

public class application {
     
	public static void main(String[] args) {
     
		awt at = new awt();
	}
}

实现过程中碰到的主要问题有:

  1. 关于JComBobox组件的更新问题,开始是直接修改值和将组件移除后重新添加,发现都行不通,在查看了JComBobox的源码之后发现底层是调用setModel方法来实现添加元素的,于是我将使用此方法来更新下拉列表框的值,成功解决此问题
box.setModel(new DefaultComboBoxModel<String>(str));
  1. 将按钮移除重新添加后必须将界面框最小化之后打开才能出现界面,查阅资料后发现Container有一个validate()方法可以用来重绘,于是便添加此方法,成功解决问题
con.validate();

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