java查询mongodb中的objectid示例

{"_id" : ObjectId("5326bfc0e6f780b21635248f")}

db.collect.find({ "_id" : ObjectId("5326bfc0e6f780b21635248f") })

import org.bson.types.ObjectId;

public DBObject findDocumentById(String id) {
    BasicDBObject query = new BasicDBObject();
    query.put("_id", new ObjectId(id));
    DBObject dbObj = collection.findOne(query);
    return dbObj;
}