使用Java从mongodb检索数组值 [英] Retrieve array values from mongodb with Java

问题描述

我有以下代码:

DBCollection collsc = db.getCollection("StudentCourses") ;
BasicDBObject querysc = new BasicDBObject("StudentID",id ); 
DBCursor curssc = collsc.find(querysc);

while(curssc.hasNext()) {

    DBObject e = curssc.next();
    System.out.println("You are currently registered for the following modules: ") ; 
    System.out.println(e.get("CoursesRegistered")) ; 

}

这将输出:

You are currently registered for the following modules: 
[ "DigitalLogic" "OperatingSystems" , "FundamentalsCSE"]

但是，我只希望从数组中返回值，即DigitalLogic，OperatingSystems和FundamentalsCSE.我将使用这些值来填充JList.请帮忙?

However i want only the values to be returned from the array, i.e, DigitalLogic, OperatingSystems and FundamentalsCSE. I will use these values to populate a JList. Help please?

推荐答案

尝试使用

BasicDBList e = (BasicDBList) curssc.next().get("CoursesRegistered");

代替

DBObject e = curssc.next();

然后从e.getIndex(index);获取值

and then get value from e.getIndex(index);

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