java - MongoDB 从 BasicDBObject 获取日期

Question

我从 MongoDB 游标返回数据 BasicDBObject ，其 toString() 返回以下数据:

{ 
    "_id" : { "$oid" : "52b8775ebf552f39c2ae5cf2"} , 
    "patient" : {
        "$ref" : "patients" , 
        "$id" : "52b848ae65b9f1856f630dd8"} , 
    "doctor" : { 
        "$ref" : "doctors" , 
        "$id" : "5294f0a76297040bf2aa6b53"} , 
    "type" : "opd" , 
    "title" : "Not feeling well" , 
    "start" : { "$date" : "2013-12-24T00:30:00.000Z"} , 
    "end" : { "$date" : "2013-12-24T00:30:00.000Z"} , 
    "reference_doctor_id" :  null 
}

我尝试获取“start”字段(Date)值，但抛出java.lang.NullPointerException。

我的Java代码:

final BasicDBObject data = (BasicDBObject) rs.next(),
patient = (BasicDBObject) ((DBRef) data.get("patient")).fetch();
final JsonObject resp = new JsonObject();
System.out.println("Appointments : \n"+data.toString());
resp.putValue("start", data.getDate("start"))
    .putValue("end", data.getDate("end"))
    .putValue("_id", (data.getObjectId("_id")).toString())
    .putValue("type", data.get("type"))
    .putValue("name", patient.get("name"))
    .putValue("patient", (patient.getObjectId("_id")).toString());

问题:如何从文档中提取"start"和"end"字段值？

Java 驱动程序:2.4.x

Answer 1

您可以使用org.joda.time.DateTime，

new DateTime(data.get("start"))