Welcome to add WeChat to communicate with each other and learn!
Project source code: https://gitee.com/oklongmm/biye
In the MVC pattern, the application is divided into three parts: Model, View and Controller. Among them, the model part contains the business logic and business data of the application; the view part encapsulates the output form of the application, which is commonly referred to as a page or interface; and the controller part is responsible for coordinating the model and the view, according to user requests Choose which model to call to process the business, and which view will ultimately respond to the user.
Model layer (Model) mainly completes business logic processing and data storage. Including the processing of business processes, state processing and business rules. The business logic receives the requested data from the view layer and returns the final processing result. The data model is the data storage of the entity object, which realizes the interaction between the view layer and the model layer. The view layer (View) is mainly for the interaction between the user and the system, displaying the data that the user needs, mainly the interface, including input and output. Generally, it can be realized by JSP, HTML page, XML and other technologies. An application can have many different application views. The MVC mode only collects and processes the data on the view, as well as the user's request, and does not process the business process on the view, but the model layer handles these business processes and states Change.
The system uses the following core Java EE technologies.
1)Spring
Spring is an open source framework. Spring is a lightweight Java development framework that emerged in 2003, derived from some of the concepts and prototypes expounded by Rod Johnson in his book Expert One-On-One J2EE Development and Design. It was created to solve the complexity of enterprise application development. Spring uses basic JavaBeans to accomplish things that previously could only be done by EJB. However, the use of Spring is not limited to server-side development. From the perspective of simplicity, testability, and loose coupling, any Java application can benefit from Spring. Simply put, Spring is a lightweight inversion of control (IoC) and aspect-oriented (AOP) container framework.
2)Spring MVC
Spring MVC is a follow-up product of SpringFrameWork and has been integrated into Spring Web Flow. Spring MVC separates the roles of controller, model object, dispatcher, and handler object. This separation makes them easier to customize.
3)MyBatis
MyBatis is a Java-based persistence layer framework. The persistence layer framework provided by iBATIS includes SQL Maps and Data Access Objects (DAO) MyBatis, which eliminates almost all manual settings of JDBC codes and parameters and retrieval of result sets. MyBatis uses simple XML or annotations for configuration and primitive mapping, mapping interfaces and Java POJOs (Plain Old Java Objects) into records in the database.
Project operation manual:
Eclipse, MyEclipse, IDEA development tools can all be quickly imported and started! !
Thesis chapter structure:
Some excerpts:
The online learning platform is mainly divided into three functional modules: system administrator module, teacher module and student module. As shown in Figure 2-1.
Figure 2-1 System function overview
1. Administrator module: Every application system needs such a role, which can ensure that the system can operate stably in a dynamic state, manage various configuration attributes of the system, and support the highest authority. The specific functions are as follows:
College management: Add, delete, query, and modify the college entity.
Course management: Add, delete, query, and modify the course entity. The course should belong to the designated college.
Teacher management: Manage teacher information, including adding, deleting, querying, and modifying. At the same time, you can import teacher information in batches through excel tables.
Student management: manage student information, including adding, deleting, querying, and modifying. At the same time, you can import student information in batches through excel tables.
Course material management: Manage course videos and documents uploaded by teachers.
Exam management: You can manage the exams issued by teachers.
Forum management: manage the discussion information between teachers and students.
Announcement management: manage the global announcements of the online learning platform.
3.1.1 System Class Diagram Design
Some classes can be roughly analyzed from the demand analysis of the online learning platform, but the entity classes in the system are not yet fully analyzed. Considering the well-known MVC pattern, we need to identify three types of objects: entity, control, and boundary. It is a very good practice to follow the MVC pattern to guide the identification of objects. The result of object recognition is the static model we need, usually expressed as a class diagram. This process uses UML modeling technology to depict the class structure in the system.
First identify the entity objects, which are relatively easy to see, such as the roles in the system (administrators, teachers, students). According to the real world, a character should have attributes such as name, gender, phone number, and ID. The system role class diagram is shown in Figure 3-1.
Entity classes such as colleges, courses, and courseware in the online learning platform. The course should belong to a certain college, and the courseware should belong to a certain course and be uploaded by the teacher. Courseware can be watched and downloaded online by students logging into the platform, and the path field stores the path of the file. The class diagram is shown in Figure 3-2: In addition to the above entity classes, there are also some notification classes. System announcements can be seen by all logged-in users. Teachers can post questions of the course to allow students to participate in the discussion, so a discussion entity is needed. Some entity objects need a little analysis to get. For example, in an online learning platform, in order to record students' responses to discussions posted by teachers, an object is needed to record this information (Discuss_post entity). The class diagram is shown in Figure 3-3:
The online learning platform also has an online test function. Teachers post exams and add test questions while giving the correct answers to the test questions. After a student logs in to the system, he can complete the test online, and the system automatically scores the student. To complete such a function, the entity classes required are task (exam), task_question (detailed test questions), and student_task (student score). The class diagram is shown in Figure 3-4:
System file introduction
