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短视频网站建设方案,在线证件照生成器,百度推广培训,网站建设确认函最近在做一个数据图表展示的功能#xff0c;显示订单近七天或者近半月的数量和金额。可以理解成下图所示的样子#xff1a; 我是用枚举和集合的stream方法实现的数据初始化和组装#xff0c;枚举用来动态初始化时间范围#xff0c;集合的stream方法来将初始化的数据转换成…最近在做一个数据图表展示的功能显示订单近七天或者近半月的数量和金额。可以理解成下图所示的样子 我是用枚举和集合的stream方法实现的数据初始化和组装枚举用来动态初始化时间范围集合的stream方法来将初始化的数据转换成map以日期为key然后查询数据库的数据组装到map中组转完后返回数据即可。我觉得这个方法不错特此记录一下。 流程如下
模拟代码如下 /*** 订单汇总测试/ public class TransinfoSum {public static void main(String[] args) {// 模拟传参前端传递显示近七天还是近半月和枚举呼应int code 1;// 初始化根据code初始化日期范围ListTransinfo transinfoList new ArrayListTransinfo();for (int t0; tTimeTypeEnum.getTimeTypeEnum(code).getNum(); t) {// 从当前日期往前减ttransinfoList.add(new Transinfo(DateUtils.dateTime(DateUtils.addDays(new Date(), -t))));}// list转mapMapString, Transinfo transinfoMap transinfoList.stream().collect(Collectors.toMap(Transinfo::getDate, transinfo - transinfo));// 模拟数据库数据ListTransinfo transinfoListFromDB new ArrayListTransinfo();// 开始组装数据for (Transinfo transinfo : transinfoListFromDB) {String date transinfo.getDate();transinfoMap.get(date).setNum(transinfo.getNum());transinfoMap.get(date).setAmount(transinfo.getAmount());}// 返回数据即可} }初始化后的数据是这样的 Transinfo{date2023-11-03, num0, amount0} Transinfo{date2023-11-02, num0, amount0} Transinfo{date2023-11-01, num0, amount0} Transinfo{date2023-10-31, num0, amount0} Transinfo{date2023-10-30, num0, amount0} Transinfo{date2023-10-29, num0, amount0} Transinfo{date2023-10-28, num0, amount0}全部代码如下 /** 枚举类定义时间类型/ public enum TimeTypeEnum {WEEK(1, 近七天, 7),FIFTEEN(2, 近半月, 15),MONTH(3, 近一月, 30);private int code;private String msg;private int num;TimeTypeEnum(int code, String msg, int num) {this.code code;this.msg msg;this.num num;}public int getCode() {return code;}public String getMsg() {return msg;}public int getNum() {return num;}public static TimeTypeEnum getTimeTypeEnum(int code) {for (TimeTypeEnum timeTypeEnum : TimeTypeEnum.values()) {if (code timeTypeEnum.getCode()) {return timeTypeEnum;}}return null;} }/** 订单汇总/ public class Transinfo {public Transinfo(){}public Transinfo(String date){this.date date;this.num 0;this.amount BigDecimal.ZERO;}private String date;private Integer num;private BigDecimal amount;public String getDate() {return date;}public void setDate(String date) {this.date date;}public Integer getNum() {return num;}public void setNum(Integer num) {this.num num;}public BigDecimal getAmount() {return amount;}public void setAmount(BigDecimal amount) {this.amount amount;}Overridepublic String toString() {return Transinfo{ date date \ , num num , amount amount };} }/** 订单汇总测试/ public class TransinfoSum {public static void main(String[] args) {// 模拟传参int code 1;// 初始化ListTransinfo transinfoList new ArrayListTransinfo();for (int t0; tTimeTypeEnum.getTimeTypeEnum(code).getNum(); t) {transinfoList.add(new Transinfo(DateUtils.dateTime(DateUtils.addDays(new Date(), -t))));}// list转mapMapString, Transinfo transinfoMap transinfoList.stream().collect(Collectors.toMap(Transinfo::getDate, transinfo - transinfo));// 模拟数据库数据ListTransinfo transinfoListFromDB new ArrayListTransinfo();// 开始组装数据for (Transinfo transinfo : transinfoListFromDB) {String date transinfo.getDate();transinfoMap.get(date).setNum(transinfo.getNum());transinfoMap.get(date).setAmount(transinfo.getAmount());}// 返回数据即可} }package com.exam.common.utils;import java.lang.management.ManagementFactory; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.ZoneId; import java.time.ZonedDateTime; import java.util.Date; import org.apache.commons.lang3.time.DateFormatUtils;/** 时间工具类* * author ruoyi/ public class DateUtils extends org.apache.commons.lang3.time.DateUtils {public static String YYYY yyyy;public static String YYYY_MM yyyy-MM;public static String YYYY_MM_DD yyyy-MM-dd;public static String YYYYMMDDHHMMSS yyyyMMddHHmmss;public static String YYYY_MM_DD_HH_MM_SS yyyy-MM-dd HH:mm:ss;private static String[] parsePatterns {yyyy-MM-dd, yyyy-MM-dd HH:mm:ss, yyyy-MM-dd HH:mm, yyyy-MM, yyyy/MM/dd, yyyy/MM/dd HH:mm:ss, yyyy/MM/dd HH:mm, yyyy/MM,yyyy.MM.dd, yyyy.MM.dd HH:mm:ss, yyyy.MM.dd HH:mm, yyyy.MM};/** 获取当前Date型日期* * return Date() 当前日期/public static Date getNowDate(){return new Date();}/** 获取当前日期, 默认格式为yyyy-MM-dd* * return String/public static String getDate(){return dateTimeNow(YYYY_MM_DD);}public static final String getTime(){return dateTimeNow(YYYY_MM_DD_HH_MM_SS);}public static final String dateTimeNow(){return dateTimeNow(YYYYMMDDHHMMSS);}public static final String dateTimeNow(final String format){return parseDateToStr(format, new Date());}public static final String dateTime(final Date date){return parseDateToStr(YYYY_MM_DD, date);}public static final String parseDateToStr(final String format, final Date date){return new SimpleDateFormat(format).format(date);}public static final Date dateTime(final String format, final String ts){try{return new SimpleDateFormat(format).parse(ts);}catch (ParseException e){throw new RuntimeException(e);}}/** 日期路径 即年/月/日 如2018/08/08/public static final String datePath(){Date now new Date();return DateFormatUtils.format(now, yyyy/MM/dd);}/** 日期路径 即年/月/日 如20180808/public static final String dateTime(){Date now new Date();return DateFormatUtils.format(now, yyyyMMdd);}/** 日期型字符串转化为日期 格式/public static Date parseDate(Object str){if (str null){return null;}try{return parseDate(str.toString(), parsePatterns);}catch (ParseException e){return null;}}/** 获取服务器启动时间/public static Date getServerStartDate(){long time ManagementFactory.getRuntimeMXBean().getStartTime();return new Date(time);}/** 计算相差天数*/public static int differentDaysByMillisecond(Date date1, Date date2){return Math.abs((int) ((date2.getTime() - date1.getTime()) / (1000 * 3600 * 24)));}/*** 计算时间差** param endDate 最后时间* param startTime 开始时间* return 时间差天/小时/分钟*/public static String timeDistance(Date endDate, Date startTime){long nd 1000 * 24 * 60 * 60;long nh 1000 * 60 * 60;long nm 1000 * 60;// long ns 1000;// 获得两个时间的毫秒时间差异long diff endDate.getTime() - startTime.getTime();// 计算差多少天long day diff / nd;// 计算差多少小时long hour diff % nd / nh;// 计算差多少分钟long min diff % nd % nh / nm;// 计算差多少秒//输出结果// long sec diff % nd % nh % nm / ns;return day 天 hour 小时 min 分钟;}/*** 增加 LocalDateTime Date/public static Date toDate(LocalDateTime temporalAccessor){ZonedDateTime zdt temporalAccessor.atZone(ZoneId.systemDefault());return Date.from(zdt.toInstant());}/** 增加 LocalDate Date*/public static Date toDate(LocalDate temporalAccessor){LocalDateTime localDateTime LocalDateTime.of(temporalAccessor, LocalTime.of(0, 0, 0));ZonedDateTime zdt localDateTime.atZone(ZoneId.systemDefault());return Date.from(zdt.toInstant());} }