我的問題是我想Expenditure通過它們在 XML 文件中存儲我的對象Data，但是對于每個Expenditure實例，都會Year創建新元素，它看起來像這樣：<Expenditures xmlns="testing"> <year xmlns="" y="2014"> <Expenditure> <date>01-01-2014</date> <money>EUR 1</money> <description>bilet autobusowy</description> <type>TRANSPORT</type> </Expenditure> </year> <year xmlns="" y="2014"> <Expenditure> <date>01-01-2014</date> <money>EUR 1</money> <description>bilet autobusowy</description> <type>TRANSPORT</type> </Expenditure> </year> <year xmlns="" y="2014"> <Expenditure> <date>01-01-2014</date> <money>EUR 1</money> <description>bilet autobusowy</description> <type>TRANSPORT</type> </Expenditure> </year> <year xmlns="" y="2014"> <Expenditure> <date>01-01-2014</date> <money>EUR 1</money> <description>bilet autobusowy</description> <type>TRANSPORT</type> </Expenditure> </year> <year xmlns="" y="2014"> <Expenditure> <date>01-01-2014</date> <money>EUR 1</money> <description>bilet autobusowy</description> <type>TRANSPORT</type> </Expenditure> </year> <year xmlns="" y="2014"> <Expenditure> <date>01-01-2014</date> <money>EUR 1</money> <description>bilet autobusowy</description> <type>TRANSPORT</type> </Expenditure> </year> <year xmlns="" y="2014"> <Expenditure> <date>01-01-2014</date> <money>EUR 1</money> <description>bilet autobusowy</description> <type>TRANSPORT</type> </Expenditure> </year> <year xmlns="" y="2014"> <Expenditure> <date>01-01-2014</date> <money>EUR 1</money> <description>bilet autobusowy</description> <type>TRANSPORT</type> </Expenditure> </year> <year xmlns="" y="2014"> <Expenditure> <date>01-01-2014</date> <money>EUR 1</money> <description>bilet autobusowy</description> <type>TRANSPORT</type> </Expenditure> </year>
1 回答
千萬里不及你
TA貢獻1784條經驗 獲得超9個贊
問題是您將thisYear元素放在循環的每次迭代中 for (Expenditure e : user.getExpenditures())。
我建議以其他方式重寫整個邏輯：在遍歷它們之前按年份對支出進行分組。
Map<Integer, List<Expenditure>> groups = expenditures.stream().collect(Collectors.groupingBy(e -> e.getDate().getYear()));
for (Entry<Integer, List<Expenditure>> entry : groups.entrySet()) {
thisYear = new Element("year");
thisYear.setAttribute("y", year + "");
entry.getValues().forEach( e -> {
Element expenditure = new Element("Expenditure");
expenditure.addContent(new Element("date")
.setText(Utils.getFormattedDateTime("dd-MM-yyyy", new DateTime(e.getDate()))));
expenditure.addContent(new Element("money").setText(e.getMonetaryAmount().toString()));
expenditure.addContent(new Element("description").setText(e.getDescription()));
expenditure.addContent(new Element("type").setText(e.getType().name()));
thisYear.addContent(expenditure);
});
doc.getRootElement().addContent(thisYear);
}
抱歉，如果有任何編譯錯誤，我沒有完整的代碼上下文。
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