Java 链接mongodb 执行集合查询

public static String mongodbConnection(String phone){
        String sendCode = null;
        //创建mongodb链接地址
        MongoClientURI uri = new MongoClientURI(properties.getProperty("mongodb.url"));
        //链接mongodb数据库
        MongoClient client = new MongoClient(uri);
        // 连接到数据库
        MongoDatabase db = client.getDatabase(properties.getProperty("mongodb.dataBaseName"));
        // 获取send_record集合
        MongoCollection collection = db.getCollection("send_record");
        //查询条件，模糊查询
        Pattern pattern = Pattern.compile(phone);
        BasicDBObject cond = new BasicDBObject();
        cond.put("phone",new BasicDBObject("$regex",pattern));
        //执行查询
        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集合处理查询结果
            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());
            //正则获取文本中的数字
            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>

执行结果
Document{{_id=5dc5279739ebb45bd97c495a, country_code=+86, phone=18680362285, content=您的验证码是559494。请不要把验证码泄露给其他人。如非本人操作，请及时修改密码以防被盗！, 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}}
您的验证码是394588。请不要把验证码泄露给其他人。如非本人操作，请及时修改密码以防被盗！
394588