使用Java从mongodb检索数组值

发布时间：2020-12-15 00:10:22 所属栏目：Java 来源：网络整理

导读：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.pr

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")) ; 

}

输出：

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

但是,我只希望从数组返回值,即DigitalLogic,OperatingSystems和FundamentalsCSE.我将使用这些值来填充一个JList.请帮助？

解决方法

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;

（编辑：李大同）

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