根据指定的日期字符串获取星期几

package com.test.demo.utils.date;

import java.util.Calendar;

/**
 * @Description: 处理日期相关
 * @Project: byy
 * @Title: HandleDate.java
 * @Author: Zhangtd
 * @Date: 2020-08-24 19:37
 **/
public class HandleDate {

    /**
     * 根据指定的日期字符串获取星期几
     *
     * @param strDate 指定的日期字符串(yyyy-MM-dd 或 yyyy/MM/dd)
     * @return week
     *         星期几(MONDAY,TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY,SUNDAY)
     */
    public static String getWeekByDateStr(String strDate)
    {
        int year = Integer.parseInt(strDate.substring(0, 4));
        int month = Integer.parseInt(strDate.substring(5, 7));
        int day = Integer.parseInt(strDate.substring(8, 10));

        Calendar c = Calendar.getInstance();

        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, month - 1);
        c.set(Calendar.DAY_OF_MONTH, day);

        String week = "";
        int weekIndex = c.get(Calendar.DAY_OF_WEEK);

        switch (weekIndex)
        {
            case 1:
                week = "星期日";
                break;
            case 2:
                week = "星期一";
                break;
            case 3:
                week = "星期二";
                break;
            case 4:
                week = "星期三";
                break;
            case 5:
                week = "星期四";
                break;
            case 6:
                week = "星期五";
                break;
            case 7:
                week = "星期六";
                break;
        }
        return week;
    }
}