Java 用于集合中多个字段的MongoDB查询

我正在尝试查询集合中的多个字段，该集合如下所示：

{ "_id" : ObjectId("54ee37f3a4cd7c1ce4483124"), "imageblock" : "http://someimage.jpg", "textblock" : "Lorem ipsum dolor sit amet, in eget aliquam, odio ut leo mi turpis a felis, adipiscing neque maecenas ac nulla nec curabitur. A hac neque magnis integer arcu ut, per bibendum, aliquet metus nec ante orci amet. Feugiat quis sit" }

检索“imageblock”和“textblock”键的值的最佳方法是什么？与MongoDB合作非常新

Mongo mg = new Mongo("localhost", 27017);
DB db = mg.getDB("deepdivedb");
DBCollection collection = db.getCollection("contentblocks");
DBCursor cursor = collection.find();

try {

    while (cursor.hasNext()) {
        System.out.println(cursor.next().get("imageblock"));                  
    }

} finally {
    cursor.close();
}  

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如果知道要访问的密钥的名称，可以在try/catch块中执行以下操作

while (cursor.hasNext()) {

    DBObject document = cursor.next();

    System.out.println(document.get("imageblock"));
    System.out.println(document.get("textblock"));
}

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啊，我很接近。成功了。非常感谢