xuexiaojiaofeixitong/src/main/java/com/chuanghai/smartschool/tuitionpayment/utils/MyUtil.java

package com.chuanghai.smartschool.tuitionpayment.utils;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * @Author: codingliang
 * @Description: 自定义工具类
 * @Date: 2021-08-20 10:36
 * @Version: V1.0
 **/
public class MyUtil {

    /**
     * 计算学生年级
     *
     * @param grade 入学年份
     * @return 年级，如当前是2021年，学生入学年份是2021，则返回 1
     */
    public static Integer calcStudentGrade(Integer grade) {
        LocalDate now = LocalDate.now();
        int currentYear = now.getYear();
        int currentMonth = now.getMonthValue();

        int currentGrade = currentYear - grade;
        if (currentGrade < 0) {
            return 1;
        } else {
            if (currentMonth < 7) {
                return currentYear - grade;
            } else {
                return currentYear - grade + 1;
            }
        }
    }

    /**
     * 将建行拼接的时间转换成localDateTime时间
     * @param orderDate
     * @return
     */
    public LocalDateTime changeTime(String orderDate) {

        StringBuilder sb = new StringBuilder(orderDate);//构造一个StringBuilder对象
        sb.insert(4, "-");//在指定的位置1，插入指定的字符串
        sb.insert(7, "-");//在指定的位置1，插入指定的字符串
        sb.insert(10, " ");//在指定的位置1，插入指定的字符串
        sb.insert(13, ":");//在指定的位置1，插入指定的字符串
        sb.insert(16, ":");//在指定的位置1，插入指定的字符串

        orderDate = sb.toString();

        LocalDateTime dateTime = LocalDateTime.parse(orderDate, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        return dateTime;
    }

    public static void main(String[] args) {
        LocalDateTime localDateTime = new MyUtil().changeTime("20220708091308");
        System.out.println(localDateTime);

        System.out.println(calcStudentGrade(2022));
    }
}