[Java知识库]Java实现打卡功能

package homework;

import java.io.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;

public class Clock_Out {
    public static int checkCount = 0;
    public static final long TWO_HOURS = 1000*60*60*2;

    public static void main(String[] args) throws ParseException {


        // 上班时间
        Calendar calendar_nine = Calendar.getInstance();

        calendar_nine.set(Calendar.HOUR_OF_DAY, 9);
        calendar_nine.set(Calendar.MINUTE, 0);
        calendar_nine.set(Calendar.SECOND, 0);
        Date timeNine = calendar_nine.getTime();
        long time0 = timeNine.getTime();
        System.out.println(time0);
        System.out.println(timeNine);

        // 下班时间
        Calendar calendar_eighteen = Calendar.getInstance();

        calendar_eighteen.set(Calendar.HOUR_OF_DAY, 18);
        calendar_eighteen.set(Calendar.MINUTE, 0);
        calendar_eighteen.set(Calendar.SECOND, 0);
        Date timeEighteen = calendar_eighteen.getTime();
        long time7 = timeEighteen.getTime();
        System.out.println(time7);
        System.out.println(timeEighteen);

        Long lastTime = readLastCheckTime();
        long time = checkTime();
        if (checkCount != 6){
            if (lastTime != null){
                if ((time - lastTime) > TWO_HOURS){
                    System.out.println("打卡失败，已超时");
                } else {
                    System.out.println("打卡成功");
                }

                String saveTime = String.valueOf(time);
                saveDate(saveTime);
            }else {
                if ((time - time0) > TWO_HOURS){
                    System.out.println("打卡失败，已超时");
                }else {
                    System.out.println("打卡成功");
                }
                String saveTime = String.valueOf(time);
                saveDate(saveTime);
            }
        }else {
            if ((time - lastTime) < TWO_HOURS && (time7 - time) < TWO_HOURS){
                System.out.println("打卡成功");
            }else{
                System.out.println("打卡失败，已超时");
            }
            String saveTime = String.valueOf(time);
            saveDate(saveTime);
        }
        System.out.println(checkCount);
    }

    private static Long readLastCheckTime() {
        BufferedReader br = null;
        Long lastTime = null;
        try {
            br = new BufferedReader(new FileReader(new File("./data/checkTime.txt")));
            String data = null;
            while ((data = br.readLine()) != null){
                if (data.startsWith("c")){
                    checkCount = Integer.parseInt(data.substring(2));
                }else {
                    lastTime = Long.parseLong(data);
                }

            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null){
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return lastTime;
    }

    /**
     * 存储打卡时间戳方法
     */
    private static void saveDate(String str) {

        BufferedWriter bw = null;
        try {
            bw = new BufferedWriter(new FileWriter(new File("./data/checkTime.txt"),true));
            bw.write(str);
            bw.newLine();
            bw.write("c:" + checkCount);
            bw.newLine();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bw != null){
                try {
                    bw.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 打卡功能模块，每次用户打卡时，调用该模块
     * @return long类型时间戳
     */
    public static long checkTime(){
        checkCount++;
        Date checkTime = new Date();
        return checkTime.getTime();
    }
}