Design and implementation of educational management system based on Java web

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2.1 Introduction to Java language

After SUN was acquired by Oracle in 2010, Java became a high-level programming language launched by Oracle. Its English name "Java" comes from the Indonesian island of Java, and its logo symbolizes a steaming cup. coffee. In an environment where the Internet is prevalent, the Java language shows very obvious advantages and has broad development prospects. Similar to C++, the basic statement syntax of the Java language is very basic, but its unique object-oriented technology is more complete. Unlike other programming languages, the Java language requires all content to be classified and uses categories as the basic unit of the program, so the system is platform independent, safe and robust. The Java language is a specific object-oriented language that can handle information transmission protocols in the network and supports the client/server model. Since variables and methods are not allowed to exist outside the class, this feature is well reflected in Java. In layman's terms, the dynamic nature of Java is dynamic installation. This operation allows Java to dynamically maintain the program. There is no specific pointer in Java, so all operations on memory are implemented through objects. This avoids errors during pointer operations and also enhances the security and reliability of the system.

The Java language has good points, but of course it also has bad points. After each compilation is completed, the bytecode consumes time, which affects the nature and function of the program to some extent. But it does not affect the widespread use of Java language. The main features of Java can be summarized as:

1.Object-oriented

Object-oriented has four major characteristics: encapsulation, inheritance, polymorphism, and abstraction. Among them, abstraction means that we only focus on the main issues and ignore the secondary parts; polymorphism focuses on different responses to the same message; and inheritance means adding your own methods based on the parent class without changing the original 's parent class.

2. Cross-platform

Java compiles the code into bytecode and executes it directly. As long as the platform contains a Java virtual machine, it can run Java programs.

3. Reliability and security

Java must access memory through instance variables to prevent pointer errors

4. Parallel processing

Java multi-threading can achieve synchronous work and improve efficiency.

2.2 SSM frame

The SSM framework is a Java Web development framework consisting of three open source frameworks: Spring, SpringMVC and MyBatis. It integrates these three frameworks, each playing a different role in its area of expertise. Among them, the Spring framework is responsible for IoC and AOP, making the code more decoupled and reusable; the MyBatis framework is responsible for operating the persistence layer, and realizes the separation of SQL and Java through mapper mapping files, making data access simpler; and SpringMVC uses client-side and server-side request monitoring and response processing to separate the processing logic of requests and responses, making development more efficient [16].

The SSM framework has many advantages. First, it extends the Spring framework so that it can be integrated with the MyBatis framework to provide better persistence capabilities. Secondly, it has complete MVC support, which can make the code more layered and easier to maintain and expand. In addition, the SSM framework also supports simple configuration and rapid development, improving development efficiency and code readability.

In short, the SSM framework is a web development framework that integrates three frameworks. It provides a flexible, efficient, secure, and easy-to-maintain method for web development. Through the SSM framework, we can quickly complete web development tasks without worrying about code coupling and maintainability issues.

2.3 B/S frame

B/S frame is a very popular technology in the IT field at present. It has been applied in many aspects, mainly including: system analysis, design and implementation. This article develops an educational management system based on JavaWeb. The software consists of two parts: a front-end page module and a back-end database; the front-end and back-end use Java programming tools and MySQL as the basic data storage library; the back-end uses MYSQL as a program writing platform and provides simple and fast codes to complete operations. When running, you only need to add the source The interface display function can be completed by burning the code to the server, because based on the B/S structure, the business processed by the system can be clearly seen, allowing managers to make decisions in a timely manner, thereby reducing the risk of losses for the enterprise [13 ].

3.4.2 Number setting Physics Design

According to the E-R diagram, design the variable names of each table.

The following is the main data table for the development and design of this project

The student attendance data table, as shown in Table 3.1, is used for information such as the number of tardies, number of absentee days, and attendance dates.

Table 3.1: Student attendance sheet

Field Name	type	field length	Field description	Is it a primary key?	default value
ID	bigint		primary key	yes
Addtime	timestamp		creation time	no	Current_TIMESTAMP
Kaoqinbianhao	varchar	200	Attendance number	no
Xueshengxuehao	varchar	200	Student ID number	no
Xueshengmingzi	varchar	200	student name	no
Kuangketianshu	int		Number of days absent from school	no
Chidaocishu	varchar	200	Number of times late	no
Kaoqinriqi	date		Attendance date	no
Jiaoshigonghao	varchar	200	Teacher ID number	no
Jiaoshimingzi	varchar	200	teacher name	no

Course classification table, as shown in Table 3.2, is used for course creation time and course classification information.

Table 3.2: Course classification table

Field Name	type	field length	Field description	Is it a primary key?	default value
ID	bigint		primary key	yes
Addtime	timestamp		creation time	no	Current_TIMESTAMP
Kechengfenlei	varchar	200	course sorts	no

The student performance table, as shown in Table 3.3, is used for information such as grading scores, dates, and performance details.

Table 3.3: Student performance table

Field Name	type	field length	Field description	Is it a primary key?	default value
ID	bigint		primary key	yes
Addtime	timestamp		creation time	no	Current_TIMESTAMP
Chengjibianhao	varchar	200	Grade number	no
Kemumingcheng	varchar	200	Course name	no
Kemuleibie	varchar	200	Course category	no
Pingfenfenshu	float		Rating score	no
Banjipaiming	int		class rank	no
Pingfenriqi	datetime		Rating date	no
Chengjixiangqing	longtext	4294967295	Score details	no
Xueshengxuehao	varchar	200	Student ID number	no
Xueshengxingming	varchar	200	student name	no
Jiaoshigonghao	varchar	200	Teacher ID number	no
Jiaoshimingzi	varchar	200	teacher name	no

The teacher table, as shown in Table 3.4, is used for information such as teacher ID, name, and password.

Table 3.4: Teacher list

Field Name	type	field length	Field description	Is it a primary key?	default value
ID	bigint		primary key	yes
Addtime	timestamp		creation time	no	Current_TIMESTAMP
Jiaoshigonghao	varchar	200	Teacher ID number	no
Jiaoshimingzi	varchar	200	teacher name	no
Mima	varchar	200	account password	no
Xingbie	varchar	200	Teacher gender	no
Touxiang	varchar	200	Choose Avatar	no
Nianling	int		Teacher age	no
Shenfenzhenghao	varchar	200	Teacher ID number	no
Dianhuahaoma	varchar	200	telephone number	no
Jianjie	longtext	4294967295	Introduction	no

The student table, as shown in Table 3.5, is used for information such as student number, name, and password.

Table 3.5: Student table

Field Name	type	character length	Field description	Is it a primary key?	default value
ID	bigint		primary key	yes
Addtime	timestamp		creation time	no	Current_TIMESTAMP
Xueshengxuehao	varchar	200	Student ID number	no
Xueshengmingzi	varchar	200	student name	no
Mima	varchar	200	account password	no
Xingbie	varchar	200	Student gender	no
Touxiang	varchar	200	Choose Avatar	no
Zhuanye	varchar	200	student's major	no
Banji	varchar	200	student's class	no
Nianling	int		student's age	no
Shenfenzhenghao	varchar	200	Student ID number	no
Dianhuahaoma	varchar	200	telephone number	no

4 Specific implementation of system functions

4.1 System function module

The home page of the system shows the school situation, announcement content, background management, etc., as shown in Figure 4.1.

On the course list page, you can view relevant information about the course, and know the introduction of the instructor and course.

The implementation process is as follows:

By clicking on the course information on the navigation bar and using the $http.get method to call the 'kechengxinxi/list' interface, you can obtain all the data in the kechengxinxi data table in the database and enter the course information interface, such as As shown in Figure 4.2.

code show as below:

Update it by writing your own information in the personal information page, as shown in Figure 4.3.

The implementation process is as follows:

Students click Modify in the personal information list, and use the $http.post method in the center folder to contact the backend. The backend calls the this.userTableName + '/update' interface to update the xuesheng data in the database. Table modification.

The core code is implemented as follows: