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Stream 分组，BigDecimal求和汇总
// 分组 Map<String, List<ChartDataView>> map = data.stream().map(t -> { ChartDataView c = new ChartDataView(); c.setDimension1(t.getDimension10()); c.setTarget1(t.getTarget7()); return c; }).collect(Collectors.拼接List的属性成str
// 法一 String fieldStr = list.stream().map(n -> n.getDimension1()).collect(Collectors.joining(",")); // 法二 List<String> fieldList = Lists.newArrayList(); for (ChartDataView chartDataView : list) { fieldList.add(chartDataView.getDimen