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whyclxw

2025-05-28 e16302f9d475c7cc4dd18c5abf1a23cb5502e362

 src/main/java/com/whyc/util/MathUtil.java

@@ -6,10 +6,7 @@
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.util.Arrays;
import java.util.Calendar;
import java.util.LinkedList;
import java.util.List;
import java.util.*;

/**
 * 计算工具类
@@ -79,8 +76,20 @@
            }
            return res;
        }else{
            return 0;
            if(type == 1){
                return 0.0;
            }else{
                if(type==2){
                    return "0";
                }else{
                    return "0%";
                }
            }
        }
    }

    public static float multiply(float num,float num2,int scale){
        return BigDecimal.valueOf(num).multiply(BigDecimal.valueOf(num2)).setScale(2,RoundingMode.HALF_UP).floatValue();
    }

    /**
@@ -165,12 +174,16 @@
                80d,
                71.9d,
                71d);*/
        long time1 = DateUtil.YYYY_MM_DD_HH_MM_SS.parse("2021-04-13 09:14:36").getTime();
        /*long time1 = DateUtil.YYYY_MM_DD_HH_MM_SS.parse("2021-04-13 09:14:36").getTime();
        long time2 = DateUtil.YYYY_MM_DD_HH_MM_SS.parse("2021-10-14 13:46:36").getTime();
        long time3 = DateUtil.YYYY_MM_DD_HH_MM_SS.parse("2022-03-18 11:08:36").getTime();
        long time4 = DateUtil.YYYY_MM_DD_HH_MM_SS.parse("2022-03-18 13:56:36").getTime();

        long time5 = DateUtil.YYYY_MM_DD_HH_MM_SS.parse("2023-03-12 13:56:36").getTime();
        long time5 = DateUtil.YYYY_MM_DD_HH_MM_SS.parse("2023-03-12 13:56:36").getTime();*/
        long time1 = ThreadLocalUtil.parse("2021-04-13 09:14:36",1).getTime();
        long time2 = ThreadLocalUtil.parse("2021-10-14 13:46:36",1).getTime();
        long time3 = ThreadLocalUtil.parse("2022-03-18 11:08:36",1).getTime();
        long time4 = ThreadLocalUtil.parse("2022-03-18 13:56:36",1).getTime();
        long time5 = ThreadLocalUtil.parse("2023-03-12 13:56:36",1).getTime();

        double c1 = 99d;
        double c2 = 98d;
@@ -198,5 +211,93 @@
    }


    /**
     *
     * @param startNum 起始数  -1 = limitStart ,因为limit是从0开始
     * @param endNum 终止数
     * @param pageSize 每页条数
     * @param queryCountMap key-年份,value-数量
     * @return {"2023",[2,20]}
     *           表名,[limit 2,20]
     */
    public static Map<String, List<Integer>> getQueryTableAndLimit(int startNum, int endNum, int pageSize, Map<String, Integer> queryCountMap) {
        Map<String,List<Integer>> resultMap = new LinkedHashMap<>();
        //定位起始数,在哪个年份范围内,起始数值;终止数,在哪个年份范围内,终止数值
        Set<String> queryKeySet = queryCountMap.keySet();
        int sum = 0;
        int lastSum = 0;

        String limitStartYear = null;
        int limitStart = 0;
        String limitEndYear = null;
        int limitEndSize = pageSize;
        boolean limitStartFinished = false;
        for (String queryKey : queryKeySet) {
            int queryCount  = queryCountMap.get(queryKey);
            sum+=queryCount;
            if(!limitStartFinished) {
                if (startNum <= sum) {
                    limitStart = startNum - lastSum;
                    limitStartYear = queryKey;
                    //完成了limit 起始值的获取,后续不需要继续执行
                    limitStartFinished = true;
                }
            }
            if(limitStartFinished) { //limit 起始值获取后,开始计算终止的记录数量
                if (endNum <= sum) {
                    limitEndYear = queryKey;

                    break;
                }
                //首次,执行起始limit的时候, limitEndSize(记录预留的查询个数)需要减去limitStart占用的
                if(limitEndSize == pageSize){
                    limitEndSize = pageSize - (sum - startNum + 1);
                }else{ //如果还没达到 终止数值,需要减去本次查询消耗掉的数量
                    limitEndSize = limitEndSize - queryCount;
                }
            }

            lastSum = sum;
        }

        boolean limitStartCompareFlag = true;
        boolean tableStartFlag = false;
        for (String queryKey : queryKeySet) {
            int queryCount  = queryCountMap.get(queryKey);
            if(queryKey.equals(limitStartYear) && limitStartCompareFlag){
                tableStartFlag = true;
                //从这里开始,取记录数
                LinkedList<Integer> limitList = new LinkedList<>();
                if(queryKey.equals(limitEndYear)) { //同一年
                    limitList.add(limitStart-1);
                    limitList.add(pageSize);
                    resultMap.put(queryKey,limitList);
                    break;
                }else{
                    limitList.add(limitStart-1);
                    limitList.add(queryCount);
                    resultMap.put(queryKey,limitList);
                }
                limitStartCompareFlag = false;
                continue;
            }
            //不同年,继续
            if(tableStartFlag) { //已经经过了起始年,才可以取数据. 起始年前的数据无效
                if (queryKey.equals(limitEndYear)) { //找到终止年
                    LinkedList<Integer> limitList = new LinkedList<>();
                    limitList.add(0);
                    limitList.add(limitEndSize);
                    resultMap.put(queryKey, limitList);
                    break;
                } else { //不是终止年,属于中间年
                    LinkedList<Integer> limitList = new LinkedList<>();
                    limitList.add(0);
                    limitList.add(queryCount);
                    resultMap.put(queryKey, limitList);
                }
            }
        }
        return resultMap;

    }
}