Java8 根据多字段分组 统计求和实例

1.本实例其实可以用一句简单的sql去实现  由于我们项目数据库中时间存的是13位的时间戳    所以必须得转行成日期格式  才能进行分组   如下：

SELECT
    count(1) simpleNumber,
    SUM(penalty_amount) AS simplePenaltyAmount,
    Handling_department,
    create_time,
LEFT(FROM_UNIXTIME(LEFT(create_time,10)),7)
FROM
    t_case_simple_case
WHERE
    1 = 1
GROUP BY Handling_department,LEFT(FROM_UNIXTIME(LEFT(create_time,10)),7)

以上的就能实现多字段求和统计等功能  但我们老大考虑到查询速度和换库等问题    建议我不要用FROM_UNIXTIME（）函数，所以只能用最笨的方法一步步实现   以下是用Java8方式实现的  代码如下：

@Override
public  List queryFirstCase(String startTime,String condition,String caseType) {
    List statisticalAnalyses = null;
    //简易案件
    if (caseType.equals(CaseTypeEnum.SIMPLETYPE.code())) {
        statisticalAnalyses = statisticalAnalysisDao.querySimpleData();
    }
    //一般案件
    if (caseType.equals(CaseTypeEnum.NORMALTYPE.code())) {
        statisticalAnalyses = statisticalAnalysisDao.queryNormalData();
    }
    for (StatisticalAnalysis analysis : statisticalAnalyses) {
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            String newCreateTime = sdf.format(new Date(Long.valueOf(analysis.getCreateTime())));
            analysis.setCreateTime(newCreateTime);
            SysOrg sysOrg = commonSearchDao.findByOrgId(analysis.getHandlingDepartment());
            if (sysOrg != null) {
                analysis.setHandlingDepartmentName(sysOrg.getOrgName());
            }
            if(analysis.getSimplePenaltyAmount()==null){
                analysis.setSimplePenaltyAmount(0.0);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    List caseTotalList = new ArrayList<>();
    //根据部门 日期进行分组 统计
    Map> caseTotal = statisticalAnalyses.stream().collect(Collectors.groupingBy(StatisticalAnalysis::getCreateTime, Collectors.groupingBy(StatisticalAnalysis::getHandlingDepartmentName, Collectors.counting())));
    //根据部门 日期进行分组 求和
    Map> sumCase = statisticalAnalyses.stream().collect(Collectors.groupingBy(StatisticalAnalysis::getCreateTime, Collectors.groupingBy(StatisticalAnalysis::getHandlingDepartmentName, Collectors.summingDouble(StatisticalAnalysis::getSimplePenaltyAmount))));
    //根据年份进行模糊匹配 取出对应的统计值
    for (Map.Entry> entry : caseTotal.entrySet()) {
        if (entry.getKey().indexOf(startTime) > -1) {
            StatisticalAnalysis statisticalAnalysis = new StatisticalAnalysis();
            statisticalAnalysis.setCreateTime(entry.getKey());
            //将年份-去掉   组成新的数字   主要作为排序
            String key = entry.getKey().replace("-", "");
            Integer sortNum = Integer.parseInt(key);
            statisticalAnalysis.setSortNum(sortNum);
            Map map = entry.getValue();
            for (Map.Entry entr : map.entrySet()) {
                statisticalAnalysis.setHandlingDepartmentName(entr.getKey());
                statisticalAnalysis.setSimpleNumber(entr.getValue());
            }
            caseTotalList.add(statisticalAnalysis);
        }
    }
    caseTotalList.sort((a, b) -> a.getSortNum() - b.getSortNum());
    //根据年份进行模糊匹配 取出对应的求和值
    List analyses = new ArrayList<>();
    for (Map.Entry> entry : sumCase.entrySet()) {
        if (entry.getKey().indexOf(startTime) > -1) {
            StatisticalAnalysis statisticalAnalysis = new StatisticalAnalysis();
            statisticalAnalysis.setCreateTime(entry.getKey());
            //将年份-去掉   组成新的数字   主要作为排序
            String key = entry.getKey().replace("-", "");
            Integer sortNum = Integer.parseInt(key);
            statisticalAnalysis.setSortNum(sortNum);
            Map map = entry.getValue();
            for (Map.Entry entr : map.entrySet()) {
                statisticalAnalysis.setHandlingDepartmentName(entr.getKey());
                statisticalAnalysis.setSimplePenaltyAmount(entr.getValue());
            }
            analyses.add(statisticalAnalysis);
        }
    }

    analyses.sort((a, b) -> a.getSortNum() - b.getSortNum());
    //将统计和求和组合成一个新的集合返回前端
    List analysisList = new ArrayList<>();
    for (StatisticalAnalysis analys : caseTotalList) {
        for (StatisticalAnalysis analys2 : analyses) {
            StatisticalAnalysis statisticalAnalysis = new StatisticalAnalysis();
            if (analys.getSortNum().intValue() == analys2.getSortNum().intValue()) {
                statisticalAnalysis.setSimpleNumber(analys.getSimpleNumber());
                statisticalAnalysis.setSimplePenaltyAmount(analys2.getSimplePenaltyAmount());
                statisticalAnalysis.setCreateTime(analys.getCreateTime());
                statisticalAnalysis.setHandlingDepartmentName(analys.getHandlingDepartmentName());
                analysisList.add(statisticalAnalysis);
            }
        }
    }
    List newAnalysisList = new ArrayList<>();
    if (analysisList.size() > 0) {
        //查询第一季度
        if (condition.equals(YearEnum.FIRST.code())) {
            for (StatisticalAnalysis analysis : analysisList) {
                StatisticalAnalysis analysis1 = new StatisticalAnalysis();
                if (analysis.getCreateTime().indexOf(startTime + "-01") > -1) {
                    BeanUtils.copyProperties(analysis, analysis1);
                    if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                        analysis1.setTitle(startTime+YearEnum.FIRST.desc()+"各部门简易案件");
                    }else{
                        analysis1.setTitle(startTime+YearEnum.FIRST.desc()+"各部门一般案件");
                    }
                    newAnalysisList.add(analysis1);
                }
                if (analysis.getCreateTime().indexOf(startTime + "-02") > -1) {
                    BeanUtils.copyProperties(analysis, analysis1);
                    if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                        analysis1.setTitle(startTime+YearEnum.FIRST.desc()+"各部门简易案件");
                    }else{
                        analysis1.setTitle(startTime+YearEnum.FIRST.desc()+"各部门一般案件");
                    }
                    newAnalysisList.add(analysis1);
                }
                if (analysis.getCreateTime().indexOf(startTime + "-03") > -1) {
                    BeanUtils.copyProperties(analysis, analysis1);
                    if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                        analysis1.setTitle(startTime+YearEnum.FIRST.desc()+"各部门简易案件");
                    }else{
                        analysis1.setTitle(startTime+YearEnum.FIRST.desc()+"各部门一般案件");
                    }
                    newAnalysisList.add(analysis1);
                }
            }
            return newAnalysisList;
    }
    //查询第二季度
    if (condition.equals(YearEnum.SECOND.code())) {
        for (StatisticalAnalysis analysis : analysisList) {
            StatisticalAnalysis analysis1 = new StatisticalAnalysis();
            if (analysis.getCreateTime().indexOf(startTime + "-04") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.SECOND.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.SECOND.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-05") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.SECOND.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.SECOND.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-06") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.SECOND.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.SECOND.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
        }
        return newAnalysisList;
    }
    //查询第三季度
    if (condition.equals(YearEnum.THREE.code())) {
        for (StatisticalAnalysis analysis : analysisList) {
            StatisticalAnalysis analysis1 = new StatisticalAnalysis();
            if (analysis.getCreateTime().indexOf(startTime + "-07") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.THREE.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.THREE.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-08") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.THREE.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.THREE.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-09") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.THREE.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.THREE.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
        }
        return newAnalysisList;
    }
    //查询第四季度
    if (condition.equals(YearEnum.FOUR.code())) {
        for (StatisticalAnalysis analysis : analysisList) {
            StatisticalAnalysis analysis1 = new StatisticalAnalysis();
            if (analysis.getCreateTime().indexOf(startTime + "-10") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.FOUR.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.FOUR.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-11") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.FOUR.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.FOUR.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-12") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.FOUR.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.FOUR.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
        }
        return newAnalysisList;
    }
    //查询上半年 取前六条数据
    if (condition.equals(YearEnum.HALF.code())) {
        for (StatisticalAnalysis analysis : analysisList) {
            StatisticalAnalysis analysis1 = new StatisticalAnalysis();
            if (analysis.getCreateTime().indexOf(startTime + "-01") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-02") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-03") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-04") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-05") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-06") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.HALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
        }
        return newAnalysisList;
    }
    //查询下半年  后六条数据
    if (condition.equals(YearEnum.LASTHALF.code())) {
        for (StatisticalAnalysis analysis : analysisList) {
            StatisticalAnalysis analysis1 = new StatisticalAnalysis();
            if (analysis.getCreateTime().indexOf(startTime + "-07") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-08") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-09") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-10") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-11") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
            if (analysis.getCreateTime().indexOf(startTime + "-12") > -1) {
                BeanUtils.copyProperties(analysis, analysis1);
                if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门简易案件");
                }else{
                    analysis1.setTitle(startTime+YearEnum.LASTHALF.desc()+"各部门一般案件");
                }
                newAnalysisList.add(analysis1);
            }
        }
        return newAnalysisList;
    }
    if (condition.equals(YearEnum.FULLYEAR.code())) {
        for (StatisticalAnalysis analysis : analysisList) {
            if(caseType.equals(CaseTypeEnum.SIMPLETYPE.code())){
                analysis.setTitle(startTime+YearEnum.FULLYEAR.desc()+"各部门简易案件");
            }else{
                analysis.setTitle(startTime+YearEnum.FULLYEAR.desc()+"各部门一般案件");
            }
        }
        return analysisList;
    }
}
    return null;
}