CN106844667A - A kind of mobile terminal examination question method of the distribution with answering based on MQTT agreements - Google Patents

Abstract

A method for distributing and answering test questions on a mobile terminal based on the MQTT protocol disclosed in the present invention, the teacher sends the test question information in JSON format through the teacher terminal in the mobile device, and distributes it to the student terminal in the mobile device through the MQTT server, and the student terminal receives After the test questions, answer and send the results to the teacher through the MQTT server again, and the teacher will score the students after receiving the answers. In the method of the present invention, in the process of test question distribution and answering, if the test questions or answer results are in picture format, they need to be uploaded to a special file server, or downloaded from the file server; The data are all uploaded to a dedicated data statistics server, and all the statistics are in line with the xAPI education big data standard.

Description

A method for distributing and answering mobile terminal test questions based on MQTT protocol

technical field

The invention relates to the field of classroom teaching, in particular to a method for distributing and answering test questions on a mobile terminal based on the MQTT protocol.

Background technique

With the rapid development of mobile terminals and the mobile Internet, the digitalization of school classrooms has become popular. Compared with traditional teaching methods, using mobile terminals as teaching tools in the classroom can greatly improve the efficiency of many teaching links, which is very representative. The most important thing is the question distribution and answering link. The teacher only needs to set the questions on the mobile terminal and distribute them to the students. The students can answer immediately, feedback the results to the teacher, and record the answers for analysis and statistics.

At present, this is only an ideal state that people expect to achieve, and there is no very mature way to meet people's needs in practical applications.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a method for distributing and answering test questions at the mobile terminal based on the MQTT protocol.

The purpose of the present invention is achieved through the following technical solutions:

A method for distributing and answering test questions on a mobile terminal based on the MQTT protocol, comprising the following steps:

S1. The teacher logs in to the teacher's application in the mobile terminal, logs in to the MQTT server, and uses the MQTT protocol to encapsulate the library, and subscribes to the topic of "all students";

S2. Students log in to the student application in the mobile terminal, log in to the MQTT server, use the MQTT protocol to encapsulate the library, and subscribe to the "teacher" topic;

S3. The teacher selects the topic, encapsulates the topic information into JSON format, and publishes the JSON text to the "all students" topic (that is, to all students), and at the same time distributes the data generated in the test session (including the subject, the content of the question, Question time and other data), uploaded to the data collection server in xAPI standard format;

S4. After students receive the questions in JSON format, they analyze them, restore them to the original questions, and display them on the student terminal interface for students to answer;

S5. After the students have finished answering, on the one hand, the result information is encapsulated in JSON format and published to the topic of "teacher" (that is, feedback to the teacher); Data) is uploaded to the data collection server in xAPI standard format;

S6. After the teacher receives the JSON text of the student's answer result, it parses it, restores it to the student's answer result, and displays it on the teacher's interface for the teacher to observe the student's answer and score;

S7. In the database of the data acquisition server, all the data stored in the xAPI standard, according to different needs, develop various interfaces for students or teachers to view all question information, answer information, scoring information or other more complex data.

In steps S1 and S2, the login MQTT server needs to use the MQTT package library at each mobile terminal, and set parameters at the same time. The parameters include server IP, port number, username, password, heartbeat time, and timeout time; after successful login , it is necessary to establish a background message monitoring mechanism to wait for the message delivered by the MQTT server.

In step S3, there are two ways to generate the question: one is to use Office-related plug-ins or other third-party test question editing tools to generate text data about the question, and the other is to use the screen capture function or camera function of the mobile terminal to form image format.

If the title is in text format, package it directly in JSON format and send it; if the title is in picture format, you need to set up an additional file server, first upload the file to the server, and obtain the URL of the picture on the server, then encapsulate the URL to send in JSON.

The format of the text data is XML or JSON.

In step S4, if the title is in a picture format, the picture needs to be downloaded from the file server according to the received picture URL.

In step S5, if the title is an objective question (including judgment questions and multiple choice questions), the answer result will be displayed directly on the student terminal after the student finishes answering; if the answer result of the student is in picture format, the file needs to be uploaded to the server first , and after obtaining the URL of the image on the server, encapsulate the URL into JSON and send it.

The teacher terminal allows the teacher to force all students to submit answer results; at the same time, if the question is an objective question, it will directly display the answer results and scores of the students who have submitted it; if it is a subjective question, it allows the teacher to perform instant scoring and send the scoring results to the response Students; in the end, regardless of subjective questions or objective questions, the score results need to be uploaded to the server in the xAPI standard format; at the same time, if the answer results of the students are in picture format, the picture needs to be uploaded from the file server according to the received picture URL Download it.

In step S7, the data collection server uses a non-relational database (including Redis, MongoDB) to store data.

The mobile terminal includes an Android device, a WP device or an iOS device.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1, the MQTT (Message Queuing Telemetry Transport) agreement that the present invention adopts is a kind of instant messaging agreement based on publish/subscribe model developed by IBM, and this agreement has following characteristics:

The transmission is very light, and the length of its fixed header is only two bytes, which is relatively more power-saving and traffic-saving.

It supports one-to-many sending model.

The Qos field in its header can guarantee the number of message delivery, and its Testament and Last Will features can notify the client of abnormal interruption, which makes it relatively reliable.

It can be seen that the MQTT protocol is especially suitable for working in one-to-many scenarios with a large number of devices, low computing power of devices, and unstable network environment. Therefore, it is ideal to use this protocol as the basic protocol for teachers to distribute test questions to students in the classroom.

2. xAPI (Experience API) is a series of data format standards formulated by the American "Advanced Distributed Learning" organization for educational big data. This standard is aimed at the education industry and aims to solve issues such as data interoperability, data format standardization, and data service expansion of big data in the education industry. All the collected data in the statistics and analysis part of the test questions of the present invention fully complies with the xAPI standard.

3. Since the MQTT protocol is used as the communication protocol, this solution has all the advantages of the MQTT protocol, such as saving traffic, saving power, simplicity, and easy expansion.

4. Use the xAPI standard, which is aimed at the education industry and solves many problems of educational big data, and is also convenient for quick connection with other systems that use this standard.

5. Support multiple test question formats, not only text test questions in XML or JSON format, but also picture format test questions.

6. The background statistical information uses a non-relational database. On the one hand, for such massive data, the non-relational database is more efficient in execution, and it is convenient to use Hadoop and other large data calculations. On the other hand, the xAPI standard itself can be based on JSON, which is very suitable for using non-relational databases.

Description of drawings

FIG. 1 is a flowchart of a method for distributing and answering test questions at a mobile terminal based on the MQTT protocol according to the present invention.

FIG. 2 is a hardware architecture diagram for implementing the method described in FIG. 1 .

detailed description

The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in Figures 1 and 2, a method for distributing and answering test questions on a mobile terminal based on the MQTT protocol includes the following steps:

S1. The teacher-side application logs in to the MQTT server, subscribes to the "teacher" topic, and starts listening to messages from the MQTT server.

S2. The student application logs in to the MQTT server, subscribes to the "all students" topic, and starts listening to messages from the MQTT server.

S3. If the test questions sent by the teacher are in picture format, the pictures of the test questions need to be uploaded to the file server first. Otherwise skip to S5.

S4. The teacher terminal receives the URL path of the test question picture returned by the picture server.

S5. The teacher publishes the test question information to the topic "All Students" in JSON format.

S6. The student end receives the test questions in JSON format, and analyzes and displays the test questions.

S7. If the test questions distributed by the teacher end are in the form of pictures, the student end initiates a request to the file server for downloading pictures and pictures. Otherwise skip to S9.

S8. The student terminal receives the URL path of the test question picture returned by the picture server.

S9. Students answer.

S10. The teacher uploads the test question distribution information to the data statistics server.

S11. If the result of the student's answer is in picture format, upload the picture of the student's answer to the file server, otherwise skip to S12.

S12. The student end receives the URL path of the student's answer picture returned by the picture server.

S13. The student end publishes the answering information to the topic "Teacher".

S14. The teacher receives the student's answer result.

S15. If the student's answering result received by the teacher is in picture format, initiate a request to the file server for downloading the student's answering picture; otherwise, skip to S16.

S16. The teacher receives the URL path of the student's answer picture returned by the picture server.

S17. The student terminal uploads the student's answer information to the data statistics server.

S18. The teacher observes the students' answers and scores them.

S19. Upload the teacher's scoring information to the data statistics server.

S20. The student terminal initiates a request to the data statistics server to view various statistical results.

S21. The student end receives the statistical result from the data statistics server.

S22. The teacher sends a request to the data statistics server to view various statistical results.

S23. The teacher terminal receives the statistical result from the data statistics server.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (10)

1. A method for distributing and answering mobile terminal test questions based on the MQTT protocol, characterized in that, comprising the following steps: S1. The teacher logs in to the teacher's application in the mobile terminal, logs in to the MQTT server, and uses the MQTT protocol to encapsulate the library, and subscribes to the topic of "all students"; S2. Students log in to the student application in the mobile terminal, log in to the MQTT server, use the MQTT protocol to encapsulate the library, and subscribe to the "teacher" topic; S3. The teacher selects a topic, encapsulates the topic information in JSON format, publishes the JSON text to the topic of "all students", and uploads the data generated in the distribution of test questions to the data collection server in the xAPI standard format; S4. After students receive the questions in JSON format, they analyze them, restore them to the original questions, and display them on the student terminal interface for students to answer; S5. After the students have finished answering, on the one hand, the result information is packaged in JSON format and published to the topic of "teacher", on the other hand, the data generated in the answering session is uploaded to the data collection server in the xAPI standard format; S6. After the teacher receives the JSON text of the student's answer result, it parses it, restores it to the student's answer result, and displays it on the teacher's interface for the teacher to observe the student's answer and score; S7. In the database of the data acquisition server, all the data stored in the xAPI standard are developed according to different requirements, and various interfaces are developed for the student or teacher to view all question information, answer information, scoring information or other data. 2. according to the method for distributing and answering the mobile terminal test questions based on the MQTT protocol of claim 1, it is characterized in that, in steps S1 and S2, the described login MQTT server needs to use the encapsulation storehouse of MQTT at each mobile terminal, and set parameters simultaneously , the parameters include server IP, port number, user name, password, heartbeat time, and timeout time; after successful login, a background message monitoring mechanism needs to be established to wait for the message delivered by the MQTT server. 3. The method for distributing and answering test questions at the mobile terminal based on the MQTT protocol according to claim 1, characterized in that, in step S3, the title has two ways of generating: one is to use Office related plug-ins or other third-party test questions The text data about the topic generated by editing tools, and the other is the image format formed by using the screen capture function or camera function of the mobile terminal. 4. according to the method for distributing and answering the mobile terminal test questions based on the MQTT protocol according to claim 3, it is characterized in that, if the title is in text format, it is directly encapsulated as JSON format and sent; if the title is in picture format, it needs to be In addition, build a file server, first upload the file to the server, and obtain the URL of the image on the server, then encapsulate the URL into JSON and send it. 5. The method for distributing and answering mobile terminal test questions based on the MQTT protocol according to claim 3, wherein the format of the text data is XML or JSON. 6. The method for distributing and answering test questions based on the mobile terminal of the MQTT protocol according to claim 1, wherein in step S4, if the title is in a picture format, the picture needs to be downloaded from the picture URL according to the received picture URL downloaded from the file server. 7. The method for distributing and answering test questions based on the MQTT protocol of claim 1, characterized in that, in step S5, if the title is an objective question, the answer result will be displayed directly on the student terminal after the students have finished answering ; If the answer result of the student is in the image format, the file needs to be uploaded to the server first, and after obtaining the URL of the image on the server, the URL is encapsulated in JSON and sent. 8. The method for distributing and answering test questions on mobile terminals based on the MQTT protocol according to claim 1, wherein the teacher allows teachers to force all students to submit answer results; if the title is an objective question, it will directly display the submitted students answer results and scores; if it is a subjective question, the teacher is allowed to perform instant grading and send the grading results to the responding students; in the end, regardless of the subjective or objective questions, the score results need to be uploaded to the server in the xAPI standard format; at the same time, If the student's answer is in picture format, the picture needs to be downloaded from the file server according to the received picture URL. 9. The method for distributing and answering mobile terminal test questions based on the MQTT protocol according to claim 1, characterized in that, in step S7, the data collection server uses a non-relational database to store data. 10. The method for distributing and answering mobile terminal test questions based on the MQTT protocol according to claim 1, wherein the mobile terminal comprises an Android device, a WP device or an iOS device.