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java8进行多个字段分组统计实现代码如下：
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// 分组统计
map<string, long> countmap = records.stream().collect(collectors.groupingby(o -> o.getproducttype() + "_" + o.getcountry(), collectors.counting()));
list<record> countrecords = countmap.keyset().stream().map(key -> {
string[] temp = key.split("_");
string producttype = temp[0];
string country = temp[1];
record record = new record();
record.set("device_type", producttype);
record.set("location", country;
record.set("count", countmap.get(key).intvalue());
return record;
}).collect(collectors.tolist());
实例补充：
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<statisticalanalysis> queryfirstcase(string starttime,string condition,string casetype) {
list<statisticalanalysis> 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<statisticalanalysis> casetotallist = new arraylist<>();
//根据部门 日期进行分组 统计
map<string, map<string, long>> 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<string, map<string, double>> 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<string, map<string, long>> 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<string, long> map = entry.getvalue();
for (map.entry<string, long> 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<statisticalanalysis> analyses = new arraylist<>();
for (map.entry<string, map<string, double>> 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<string, double> map = entry.getvalue();
for (map.entry<string, double> 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<statisticalanalysis> 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<statisticalanalysis> 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;
}
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