java - 使用 Java 从 mongodb 中检索数组值

Question

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")) ; 

}

这个输出:

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？

Answer 1

尝试使用

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

而不是

DBObject e = curssc.next();

然后从e.getIndex(index)中获取值；