基于Java swing实现的小计划日历

2020-07-22
字数统计: 2.1k字 | 阅读时长: 11分
前言

本篇并非技术贴，只是为有需要的人提供参考，我所写的代码有很多限制，例如
只能操作指定格式的计划，删除多行内容会产生一些显示错误等等，期望大家使用
时可以进行优化，本篇只提供一个参考。
代码如下:
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;
import java.util.GregorianCalendar;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JTextField;




public class calendar extends JFrame implements ActionListener{
    //月份和年份下拉 列表框
    private JComboBox MonthBox = new JComboBox();
    private JComboBox YearBox = new JComboBox();

    //年份月份标签
    private JLabel YearLabel = new JLabel("年份：");
    private JLabel MonthLabel = new JLabel("月份：");

    //确定和今天按钮
    private JButton button_ok = new JButton("查看");
    private JButton button_today = new JButton("今天");


    //获取今天的日期、年份和月份
    private Date now_date = new Date();
    
    //获取当前的日期
    private Date current_date = null;

    @SuppressWarnings("deprecation")
	private int now_year = now_date.getYear() + 1900;
    @SuppressWarnings("deprecation")
	private int now_month = now_date.getMonth();
    private boolean todayFlag = false;

    //用一组按钮显示日期，一共7行7列。第一行是星期
    private JButton[] button_day = new JButton[42];
    private final String[] week = {"SUN","MON","TUE","WEN","THR","FRI","SAT"};
    private JButton[] button_week = new JButton[7];
    private String year_int = null;
    private int month_int;
    
    //设置计划区三个按钮
    private JButton button_add = new JButton("添加");
    private JButton button_delete = new JButton("删除");
    private JButton button_update = new JButton("更新");

    //计划区显示与输入
    private JTextArea plan_reveal = new JTextArea("");
    private JTextField plan_do = new JTextField(30);    
    
    /*构造函数*/
    public calendar(){
        super();
        this.setTitle("计划日历");
        this.init();
        this.setLocation(500, 300);
        this.setResizable(false);
        pack();

    }

    //初始化日历
    private void init() {
        Font font = new Font("Dialog",Font.BOLD,16);
        YearLabel.setFont(font);
        MonthLabel.setFont(font);
        button_ok.setFont(font);
        button_today.setFont(font);
        button_add.setFont(font);
        button_delete.setFont(font);
        button_update.setFont(font);
        
        //显示区设置大小
        plan_reveal.setLineWrap(true);
        plan_reveal.setEditable(false);
        plan_reveal.setPreferredSize(new Dimension(30,180));
        button_add.setPreferredSize(new Dimension(110,20));
        button_delete.setPreferredSize(new Dimension(50,20));
        button_update.setPreferredSize(new Dimension(110,20));
        
        //过去20年--未来20年
        for(int i = now_year - 20;i <= now_year + 100;i++){
            YearBox.addItem(i+"");
        }
        YearBox.setSelectedIndex(20);

        for(int i = 1;i < 13;i++){
            MonthBox.addItem(i+"");
        }
        MonthBox.setSelectedIndex(now_month);

        //放置下拉列表框和控制按钮的面板
        JPanel panel_ym = new JPanel();
        panel_ym.add(YearLabel);
        panel_ym.add(YearBox);
        panel_ym.add(MonthLabel);
        panel_ym.add(MonthBox);
        panel_ym.add(button_ok);
        panel_ym.add(button_today);

        //为两个按钮添加时间监听器
        button_ok.addActionListener(this);
        button_today.addActionListener(this);
        button_add.addActionListener(this);
        button_delete.addActionListener(this);
        button_update.addActionListener(this);
        
        


        JPanel panel_day = new JPanel();
        //7*7
        panel_day.setLayout(new GridLayout(7, 7, 3, 3));
        for(int i = 0; i < 7; i++) {
            button_week[i] = new JButton(" ");
            button_week[i].setText(week[i]);
            button_week[i].setForeground(Color.black);
            panel_day.add(button_week[i]);
        }
        button_week[0].setForeground(Color.red);
        button_week[6].setForeground(Color.red);

        for(int i = 0; i < 42;i++){
            button_day[i] = new JButton(" ");
            button_day[i].addActionListener(this);
            panel_day.add(button_day[i]);
        }

        this.paintDay();//显示当前日期
        
        //将按钮整合
        JPanel panel_do = new JPanel();
        panel_do.setLayout(new BorderLayout());
        panel_do.add(button_add,BorderLayout.WEST);
        panel_do.add(button_delete,BorderLayout.CENTER);
        panel_do.add(button_update,BorderLayout.EAST);
        
        
        //为计划添加面板
        JPanel panel_plan = new JPanel();
        //加入显示 操作  和按钮
        panel_plan.setLayout(new BorderLayout());
        panel_plan.add(plan_reveal,BorderLayout.NORTH);
        panel_plan.add(plan_do,BorderLayout.CENTER);
        panel_plan.add(panel_do,BorderLayout.SOUTH);
        
        JPanel panel_main = new JPanel();
        panel_main.setLayout(new BorderLayout());
        panel_main.add(panel_day,BorderLayout.CENTER);
        panel_main.add(panel_ym,BorderLayout.NORTH);
        panel_main.add(panel_plan,BorderLayout.EAST);
        getContentPane().add(panel_main);

    }

    @SuppressWarnings("deprecation")
	private void paintDay() {
        if(todayFlag){
            year_int = now_year +"";
            month_int = now_month;
        }else{
            year_int = YearBox.getSelectedItem().toString();
            month_int = MonthBox.getSelectedIndex();
        }
        int year_sel = Integer.parseInt(year_int) - 1900;
        Date firstDay = new Date(year_sel, month_int, 1);
        GregorianCalendar cal = new GregorianCalendar();
        cal.setTime(firstDay);
        int days = 0;
        int day_week = 0;

        if(month_int == 0||month_int == 2||month_int == 4||month_int == 6
                ||month_int == 7||month_int == 9||month_int == 11){
            days = 31;
        }else if(month_int == 3||month_int == 5||month_int == 8||month_int == 10){
            days = 30;
        }else{
            if(cal.isLeapYear(year_sel)){
                days = 29;
            }else{
                days = 28;
            }
        }

        day_week = firstDay.getDay();
        int count = 1;

        for(int i = day_week;i<day_week+days;count++,i++){
            if(i%7 == 0||(i+1)%7 == 0){
                if((i == day_week+now_date.getDate()-1)&& month_int==now_month && (year_sel == now_year-1900)){
                    button_day[i].setForeground(Color.BLUE);
                    //button_day[i].setText(count+"");
                    button_day[i].setLabel(count+"");
                }else{
                    button_day[i].setForeground(Color.RED);
                    //button_day[i].setText(count+"");
                    button_day[i].setLabel(count+"");
                }
            }else{
                if((i == day_week+now_date.getDate()-1)&& month_int==now_month && (year_sel == now_year-1900)){
                    button_day[i].setForeground(Color.BLUE);
                    //button_day[i].setText(count+"");
                    button_day[i].setLabel(count+"");
                }else{
                    button_day[i].setForeground(Color.BLACK);
                    //button_day[i].setText(count+"");
                    button_day[i].setLabel(count+"");
                }
            }

        }
        if(day_week == 0){
            for(int i = days;i<42;i++){
                button_day[i].setText("");
            }
        }else{
            for(int i = 0;i<day_week;i++){
                button_day[i].setText("");
            }
            for(int i=day_week+days;i<42;i++){
                button_day[i].setText("");
            }
        }


    }

    

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==button_ok){
            todayFlag=false;
            this.paintDay();
        }
        else if(e.getSource()==button_today){
            todayFlag=true;
            YearBox.setSelectedIndex(20);
            MonthBox.setSelectedIndex(now_month);
            this.paintDay();
        }
        //添加
        else if (e.getSource()==button_add) {
        	String ddate = String.valueOf(current_date.getYear())+String.valueOf(current_date.getMonth())+String.valueOf(current_date.getDate());
        	//System.out.print(ddate);
        	File file = new File(ddate+".txt");
        	if(file.exists()) {
        		try {
					FileWriter writer = new FileWriter(file,true);
					writer.write(plan_do.getText()+"\n");
					writer.flush();
					writer.close();
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
        		
        	}
        	else {
        		try {
					file.createNewFile();
					FileWriter writer = new FileWriter(file,true);
					writer.write(plan_do.getText()+"\n");
					writer.flush();
					writer.close();
        		} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
        	}
        	
			
		}
        //删除
        else if (e.getSource()==button_delete) {
        	String ddate = String.valueOf(current_date.getYear())+String.valueOf(current_date.getMonth())+String.valueOf(current_date.getDate());
        	//System.out.print(ddate);
        	File file = new File(ddate+".txt");
        	if(file.exists()) {
        		try {
					FileReader fr = new FileReader(file);
					//前期准备，用char数组操作
					char[] a = new char[2000];
					fr.read(a);
					char[] b = new char[2000];
					String d = null;
					d = plan_do.getText();
					b = d.toCharArray();
					//for(int i=0;i<b.length;i++) {System.out.println(b[i]);}
					//新建result
					char[] result = new char[2000];
					//开始筛选
					int j=0;
					for(int i=0;i<a.length;i++) {
						int key = 0;
						int count=0;
						if((a[i]==b[0]&&i==0)||(a[i]==b[0]&&a[i-1]=='\n')){
							//System.out.println("aifind");
							for(int ii=i,jj=0;b[jj]!=',';ii++,jj++) {
								if(a[ii]==b[jj]) {
									key = 1;
								}
								else {
									key = 0;
									break;
								}}
						}
						if(key==0) {
							result[j] = a[i];
							j++;
						}
						else if(key==1) {
							count = 0;
							for(int ii=i;a[ii]!='\n';ii++) {
								count++;
							}
							i=i+count;
						}
					}
					//for(int i=0;i<result.length;i++) {System.out.println(result[i]);}
					
					//写入
					FileWriter writer = new FileWriter(file);
					String reString = String.valueOf(result);
					//System.out.println(reString);
					writer.write(reString);
					writer.flush();
					writer.close();
				} catch (FileNotFoundException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
        		
        	}
        	else {
        		
        	}
		}
        //更新
        else if (e.getSource()==button_update) {
        	String ddate = String.valueOf(current_date.getYear())+String.valueOf(current_date.getMonth())+String.valueOf(current_date.getDate());
        	//System.out.print(ddate);
        	File file = new File(ddate+".txt");
        	if(file.exists()) {
        		try {
					FileReader fr = new FileReader(file);
					//前期准备，用char数组操作
					char[] a = new char[2000];
					fr.read(a);
					char[] b = new char[2000];
					String d = null;
					d = plan_do.getText();
					b = d.toCharArray();
					//for(int i=0;i<b.length;i++) {System.out.println(b[i]);}
					//新建result
					char[] result = new char[2000];
					//开始筛选
					int j=0;
					for(int i=0;i<a.length;i++) {
						int key = 0;
						int count=0;
						if((a[i]==b[0]&&i==0)||(a[i]==b[0]&&a[i-1]=='\n')){
							//System.out.println("aifind");
							for(int ii=i,jj=0;b[jj]!=',';ii++,jj++) {
								if(a[ii]==b[jj]) {
									key = 1;
								}
								else {
									key = 0;
									break;
								}}
						}
						if(key==0) {
							result[j] = a[i];
							j++;
						}
						else if(key==1) {
							count = 0;
							for(int ii=0;b[ii]!='#';ii++) {
								result[j] = b[ii];
								j++;
								count++;
							}
							i=i+count-1;
						}
					}
					//for(int i=0;i<result.length;i++) {System.out.println(result[i]);}
					
					//写入
					FileWriter writer = new FileWriter(file);
					String reString = String.valueOf(result);
					//System.out.println(reString);
					writer.write(reString);
					writer.flush();
					writer.close();
				} catch (FileNotFoundException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
        		
        	}
        	else {
        		
        	}
        }
        //显示
        else {
        	for(int i=0;i<42;i++) {
        		if(e.getSource().equals(button_day[i])) {
        			if(todayFlag){
                        year_int = now_year +"";
                        month_int = now_month;
                    }else{
                        year_int = YearBox.getSelectedItem().toString();
                        month_int = MonthBox.getSelectedIndex();
                    }
                    int year_sel = Integer.parseInt(year_int) - 1900;
                    int dday = Integer.parseInt(button_day[i].getLabel());
                	current_date = new Date(year_sel, month_int,dday);
        		}
        	}
        	String ddate = String.valueOf(current_date.getYear())+String.valueOf(current_date.getMonth())+String.valueOf(current_date.getDate());
        	//System.out.print(ddate);
        	File file = new File(ddate+".txt");
        	if(file.exists()) {
        		try {
					FileReader fr = new FileReader(file);
					char[] a = new char[5000];
					fr.read(a);
					plan_reveal.setText(String.valueOf(a));
				} catch (FileNotFoundException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
        		
        	}
        	else {
        		plan_reveal.setText("暂无内容");
			}
        	
        	
        }


    }

    public static void main(String[] args) {
        calendar ct = new calendar();
        ct.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        ct.setVisible(true);

    }

}
代码中的限制包括只能读取规定大小内的char数组(或许能用流式处理改进)，显示区域无滑动条
以及前言提到的等等。