java设计并完成一个数据驱动的管理系统

目录

一、运行环境

1、环境：

2、实现一个管理系统需要以下步骤：

二、创建项目

1.创建

2、选择依赖

3、项目结构

4、配置数据库

 三、代码

1、Model层

2、Repository层

3、Service层

3.1接口

3.2、实现

4、Controller层

5、视图层

5.1、index.html

5.2、new_student.html

5.3、test.html

5.4、update_student.html

四、运行结果

---

一、运行环境

1、环境：

IDE - IDEA

Spring Boot 3+

Spring Framework 6+

Maven

Java 17

Spring Data JPA ( Hibernate)

Thymeleaf

2、实现一个管理系统需要以下步骤：

• 确定需求：首先需要了解管理系统的需求，包括功能模块和功能细节。
• 设计数据库：根据管理系统的需求设计相应的数据库，包括表结构和表之间的关系。
• 设计用户界面：为管理系统设计相应的用户界面，使用户操作方便。
• 编写代码：根据设计的数据库和用户界面，使用 Java 编写管理系统的代码。
• 测试与调试：对管理系统进行测试，检查代码是否有误，并对代码进行调试。
• 发布与维护：将管理系统发布到相应的服务器上，并对管理系统进行维护。

二、创建项目

1.创建

2、选择依赖

3、项目结构

4、配置数据库

代码

spring.datasource.url=jdbc:mysql://localhost/testdb?useSSL=false&serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
spring.datasource.username= root
spring.datasource.password= 123456

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# for Spring Boot 2
# spring.jpa.properties.hibernate.dialect= org.hibernate.dialect.MySQL5InnoDBDialect

# for Spring Boot 3
spring.jpa.properties.hibernate.dialect= org.hibernate.dialect.MySQLDialect

# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto= update

#?????hibernate-sql
logging.level.org.hibernate.SQL=DEBUG
logging.level.org.hibernate.type=TRACE

 三、代码

1、Model层

import jakarta.persistence.*;
import lombok.Data;
@Data
@Entity
@Table(name = "students")
public class Student {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    @Column(name = "student_name")
    private String studentName;

    @Column(name = "student_age")
    private String studentAge;

    @Column(name = "counsellor")//辅导员
    private String counsellor;
}

2、Repository层

3、Service层

3.1接口

StudentService

import java.util.List;
import en.edu.lzzy.s05mvcemployee.model.Student;
import org.springframework.data.domain.Page;

public interface StudentService {

    //获取所有的学生
    List  getAllStudents();

    //新增/更新一个学生
    void saveStudent(Student student);

    //获取指定ID的学生
    Student getStudentById(long id);

    //删除指定ID的学生
    void deleteStudentById(long id);


    //分页
    Page findPaginated(int pageNo, int pageSize, String sortField, String sortDirection);
}

3.2、实现

StudentServiceImpl

import java.util.List;
import java.util.Optional;

import en.edu.lzzy.s05mvcemployee.model.Student;
import en.edu.lzzy.s05mvcemployee.repository.StudentRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Service;


@Service
public class StudentServiceImpl implements StudentService {

    @Autowired
    private StudentRepository studentRepository;

    @Override
    public List  getAllStudents() {
        return studentRepository.findAll();
    }

    @Override
    public void saveStudent(Student student) {
        this.studentRepository.save(student);
    }

    @Override
    public Student getStudentById(long id) {
        //调用数据访问层查找指定ID的学生，返回Optional对象
        Optional  optional = studentRepository.findById(id);

        Student student = null;
        //如果存在指定id的学生
        if (optional.isPresent()) {
            //从Optional对象中获取学生对象
            student = optional.get();
        } else {
            //否则抛出运行时异常
            throw new RuntimeException(" 找不到学生ID :: " + id);
        }
        return student;
    }

    @Override
    public void deleteStudentById(long id) {
        this.studentRepository.deleteById(id);
    }

    @Override
    public Page findPaginated(int pageNo, int pageSize, String sortField, String sortDirection) {
        //设置排序参数，升序ASC/降序DESC？
        Sort sort = sortDirection.equalsIgnoreCase(Sort.Direction.ASC.name())
                    ? Sort.by(sortField).ascending()
                    : Sort.by(sortField).descending();

         //根据页号/每页记录数/排序依据返回某指定页面数据。
        Pageable pageable = PageRequest.of(pageNo - 1, pageSize, sort);
        return this.studentRepository.findAll(pageable);
    }
}

4、Controller层

代码

import en.edu.lzzy.s05mvcemployee.model.Student;
import en.edu.lzzy.s05mvcemployee.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import java.util.List;


@Controller
public class StudentController {

    @Autowired
    private StudentService studentService;

//     display list of employees
//    @GetMapping("/")
//    public String viewHomePage(Model model) {
//        model.addAttribute("listEmployees", employeeService.getAllEmployees());
//        return "index";
//    }
    @GetMapping("/")
    public String viewHomePage(Model model) {
        return findPaginated(1, "studentName", "asc", model);
    }

    @GetMapping("/showNewStudentForm")
    public String showNewStudentForm(Model model) {
        // create model attribute to bind form data
        Student student = new Student();
        model.addAttribute("student", student);
        return "new_student";
    }

    @PostMapping("/saveStudent")
    public String saveStudent(@ModelAttribute("student") Student student) {
        // save employee to database
        studentService.saveStudent(student);
        return "redirect:/";
    }

    @GetMapping("/showFormForUpdate/{id}")
    public String showFormForUpdate(@PathVariable(value = "id") long id, Model model) {

        // get employee from the service
        Student student = studentService.getStudentById(id);

        // set employee as a model attribute to pre-populate the form
        model.addAttribute("student", student);
        return "update_student";
    }

    @GetMapping("/deleteStudent/{id}")
    public String deleteStudent(@PathVariable(value = "id") long id) {

        // call delete employee method
        this.studentService.deleteStudentById(id);
        return "redirect:/";
    }

    //获取分页数据
    @GetMapping("/page/{pageNo}")
    public String findPaginated(@PathVariable (value = "pageNo") int pageNo,
                                @RequestParam("sortField") String sortField,
                                @RequestParam("sortDir") String sortDir,
                                Model model) {
        int pageSize = 5;

        Page page = studentService.findPaginated(pageNo, pageSize, sortField, sortDir);
        List listStudents = page.getContent();

        model.addAttribute("currentPage", pageNo);
        model.addAttribute("totalPages", page.getTotalPages());
        model.addAttribute("totalItems", page.getTotalElements());

        model.addAttribute("sortField", sortField);
        model.addAttribute("sortDir", sortDir);
        model.addAttribute("reverseSortDir", sortDir.equals("asc") ? "desc" : "asc");

        model.addAttribute("listStudents", listStudents);
        return "index";
    }
}

5、视图层

5.1、index.html

    
    

    





    
Students List

     Add Student 

    

        

        

            

                
                    Student Name
            
            

                
                    Student Age
            
            

                
                    Student Counsellor
            
            
 Actions 
        
        
        

        

            

            

            

            
 Update
                Delete
            
        
        
    

    

        

            

                Total Rows: [[${totalItems}]]
            
            

					
						[[${i}]]
						[[${i}]]     
					
            
            

                Next
                Next
            

            

                Last
                Last
            
        
    

5.2、new_student.html

    
    
    




    
Student Management System
    

    
Save Student

    

        

        

        

         Save Student
    

    


     Back to Student List

5.3、test.html

    
    
     



    

        

            1 of 2
        
        

            2 of 2
        
    
    

        

            1 of 3
        
        

            2 of 3
        
        

            3 of 3
        
        

            1 of 3
        
        

            2 of 3
        
        

            3 of 3
        
    

5.4、update_student.html

    
    
    

   



    
Student Management System
    

    
Update Student

    


        
        

        

        

        

         Update Student
    

    


     Back to Student List

四、运行结果