package com.nuvole.util;
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import java.math.RoundingMode;
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import java.text.DecimalFormat;
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import java.text.NumberFormat;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.ArrayList;
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import java.util.Calendar;
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import java.util.List;
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/**
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* 计算工具类
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*
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* @Author: lc
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* @Date: 2019/5/23 19:10
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*/
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public class ComputeUtil {
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/**
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* 计算百分比
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*
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* @param num 占比值
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* @param total 总数
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* @param scale 小数
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* @Author: lc
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* @Date: 2019/8/22 10:32
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*/
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public static String percentum(double num, double total, int scale) {
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if (num == 0 || total == 0) {
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return "0";
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}
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DecimalFormat df = (DecimalFormat) NumberFormat.getInstance();
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//可以设置精确几位小数
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df.setMaximumFractionDigits(scale);
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//模式 例如四舍五入
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df.setRoundingMode(RoundingMode.HALF_UP);
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double accuracy_num = num / total * 100;
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return df.format(accuracy_num);
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}
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/**
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* 获取两个日期之间所有日期（年月日）
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*
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* @Author: lc
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* @Date: 2019/8/23 13:41
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*/
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public static List<String> getBetweenDates(String begin, String end, String formatString) {
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SimpleDateFormat format = new SimpleDateFormat(formatString);
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List<String> result = new ArrayList<String>();
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try {
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Calendar tempStart = Calendar.getInstance();
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tempStart.setTime(format.parse(begin));
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tempStart.add(Calendar.DAY_OF_YEAR, 1);
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Calendar tempEnd = Calendar.getInstance();
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tempEnd.setTime(format.parse(end));
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result.add(format.format(format.parse(begin)));
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while (tempStart.before(tempEnd)) {
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result.add(format.format(tempStart.getTime()));
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tempStart.add(Calendar.DAY_OF_YEAR, 1);
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}
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result.add(format.format(format.parse(end)));
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} catch (Exception e) {
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e.printStackTrace();
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}
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return result;
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}
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/**
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* 获取俩个日期间的所有日期（年月）
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*
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* @Author: lc
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* @Date: 2019/8/24 16:31
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*/
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public static List<String> getBetweenMonths(String minDate, String maxDate, String formatString) {
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ArrayList<String> result = new ArrayList<String>();
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try {
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SimpleDateFormat sdf = new SimpleDateFormat(formatString);//格式化为年月
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Calendar min = Calendar.getInstance();
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Calendar max = Calendar.getInstance();
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min.setTime(sdf.parse(minDate));
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min.set(min.get(Calendar.YEAR), min.get(Calendar.MONTH), 1);
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max.setTime(sdf.parse(maxDate));
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max.set(max.get(Calendar.YEAR), max.get(Calendar.MONTH), 2);
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Calendar curr = min;
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while (curr.before(max)) {
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result.add(sdf.format(curr.getTime()));
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curr.add(Calendar.MONTH, 1);
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}
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} catch (ParseException e) {
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e.printStackTrace();
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}
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return result;
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}
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}
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