如何使用java从mongo db中嵌入在数组中的内部文档中检索数据

现在我想从InnerDocumentListInsertion中获取值，它位于

[]

括号中的listEditions中

---

因此，如何获取它。

这是JSON，您可以使用解析它，或者使用将它映射到Java对象。

您可以使用如下内容：

{ "listEditions" : [ { "listInsertion" : [ { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]} , { "listInsertion" : [ { "page" : 2 , "fromDate" : "14/06/2013" , "toDate" : "14/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "14/06/2013" , "toDate" : "14/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]} , { "listInsertion" : [ { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]} , { "listInsertion" : [ { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]} , { "listInsertion" : [ { "page" : 2 , "fromDate" : "15/06/2013" , "toDate" : "15/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "15/06/2013" , "toDate" : "15/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]}] , "referenceID" : "E13F31BC80CE"}

如果需要，添加

instanceof

和其他检查

{ "listEditions" : [ { "listInsertion" : [ { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]} , { "listInsertion" : [ { "page" : 2 , "fromDate" : "14/06/2013" , "toDate" : "14/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "14/06/2013" , "toDate" : "14/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]} , { "listInsertion" : [ { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]} , { "listInsertion" : [ { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "11/06/2013" , "toDate" : "11/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]} , { "listInsertion" : [ { "page" : 2 , "fromDate" : "15/06/2013" , "toDate" : "15/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0} , { "page" : 2 , "fromDate" : "15/06/2013" , "toDate" : "15/06/2013" , "size" : 240 , "color" : 0 , "colorType" : "All Colour" , "pagePosition" : 2 , "pagePositionType" : "Regular Page" , "sizeDimention" : "12x20" , "width" : 12.0 , "height" : 20.0}]}] , "referenceID" : "E13F31BC80CE"}

DBObject next = cursor.next();
BasicDBList listEditions = (BasicDBList)next.get("listEditions");
for(Object element: listEditions) {
    BasicDBList listInsertions = (BasicDBList)((BasicDBObject)element).get("listInsertion");
    for(Object lie: listInsertions) {
        System.out.println(lie);
        //System.out.println(((BasicDBObject)lie).get("fromDate"));
    }
}