Java 鏈接mongodb 執行集合查詢

public static String mongodbConnection(String phone){
        String sendCode = null;
        //創建mongodb鏈接地址
        MongoClientURI uri = new MongoClientURI(properties.getProperty("mongodb.url"));
        //鏈接mongodb數據庫
        MongoClient client = new MongoClient(uri);
        // 連接到數據庫
        MongoDatabase db = client.getDatabase(properties.getProperty("mongodb.dataBaseName"));
        // 獲取send_record集合
        MongoCollection collection = db.getCollection("send_record");
        //查詢條件，模糊查詢
        Pattern pattern = Pattern.compile(phone);
        BasicDBObject cond = new BasicDBObject();
        cond.put("phone",new BasicDBObject("$regex",pattern));
        //執行查詢
        MongoCursor<Document> cursor = collection.find(cond).iterator();
        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
        while (cursor.hasNext()){
            System.out.println(cursor.next());
            //map集合處理查詢結果
            Map<String, Object> map = new HashMap<String, Object>();
            map.putAll(cursor.next());
            list.add(map);
            String regEx="[^0-9]";
            Pattern p = Pattern.compile(regEx);
            System.out.println(map.get("content").toString());
            //正則獲取文本中的數字
            sendCode = p.matcher(map.get("content").toString()).replaceAll("").trim();
        }
        return sendCode;
    }

<dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>mongo-java-driver</artifactId>
            <version>3.10.2</version>
 </dependency>

執行結果
Document{{_id=5dc5279739ebb45bd97c495a, country_code=+86, phone=18680362285, content=您的驗證碼是559494。請不要把驗證碼泄露給其他人。如非本人操作，請及時修改密碼以防被盜！, status=1, remark={"code":"0","msg":"SUCCESS","batchId":"5v6X312"}, last_update_time=Fri Nov 08 16:30:15 CST 2019, created=Fri Nov 08 16:30:15 CST 2019, _class=com.blockeng.repository.SendRecord}}
您的驗證碼是394588。請不要把驗證碼泄露給其他人。如非本人操作，請及時修改密碼以防被盜！
394588