书写使用springboot和Vue建立学生选课系统的代码

这个需求涉及到前后端的开发，需要分别建立Spring Boot后端和Vue前端的工程。下面给出一个简单的示例代码：

Spring Boot后端：

1. 创建Spring Boot工程

2. 添加依赖

<!--Spring Boot Web-->
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!--Spring Boot Data JPA-->
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<!--MySQL驱动-->
<dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <scope>runtime</scope>
</dependency>

3. 配置数据库连接

spring.datasource.url=jdbc:mysql://localhost:3306/db_example
spring.datasource.username=springuser
spring.datasource.password=ThePassword
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

4. 定义实体类

@Entity
@Table(name="student")
public class Student {
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;
    private String name;
    private String gender;
    private String major;
    private Integer grade;
    
    // Getters and Setters
}

5. 定义Repository接口

@Repository
public interface StudentRepository extends JpaRepository<Student, Integer> {
}

6. 定义Controller

@RestController
@RequestMapping("/api")
public class StudentController {
    
    @Autowired
    private StudentRepository studentRepository;
    
    @GetMapping("/students")
    public List<Student> getStudents() {
        return studentRepository.findAll();
    }
    
    @PostMapping("/students")
    public Student addStudent(@RequestBody Student student) {
        return studentRepository.save(student);
    }
    
    @DeleteMapping("/students/{id}")
    public void deleteStudent(@PathVariable Integer id) {
        studentRepository.deleteById(id);
    }
}

7. 运行工程

Vue前端：

1. 创建Vue工程

2. 安装axios

npm install axios --save

3. 编写组件

<template>
  <div class="container">
    <h2>学生选课系统</h2>
    <div class="form-group">
      <label for="name">姓名：</label>
      <input type="text" class="form-control" v-model="student.name" id="name">
    </div>
    <div class="form-group">
      <label for="gender">性别：</label>
      <input type="text" class="form-control" v-model="student.gender" id="gender">
    </div>
    <div class="form-group">
      <label for="major">专业：</label>
      <input type="text" class="form-control" v-model="student.major" id="major">
    </div>
    <div class="form-group">
      <label for="grade">年级：</label>
      <input type="number" class="form-control" v-model="student.grade" id="grade">
    </div>
    <button class="btn btn-primary" @click="addStudent">添加学生</button>
    <table class="table mt-3">
      <thead>
        <tr>
          <th>编号</th>
          <th>姓名</th>
          <th>性别</th>
          <th>专业</th>
          <th>年级</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="student in students" :key="student.id">
          <td>{{student.id}}</td>
          <td>{{student.name}}</td>
          <td>{{student.gender}}</td>
          <td>{{student.major}}</td>
          <td>{{student.grade}}</td>
          <td>
            <button class="btn btn-danger" @click="deleteStudent(student.id)">删除</button>
          </td>
        </tr>
      </tbody>
    </table>
  </div>
</template>

<script>
import axios from 'axios';

export default {
  data() {
    return {
      student: {
        name: '',
        gender: '',
        major: '',
        grade: ''
      },
      students: []
    }
  },
  mounted() {
    this.getStudents();
  },
  methods: {
    getStudents() {
      axios.get('/api/students')
        .then(response => {
          this.students = response.data;
        });
    },
    addStudent() {
      axios.post('/api/students', this.student)
        .then(response => {
          this.students.push(response.data);
          this.student.name = '';
          this.student.gender = '';
          this.student.major = '';
          this.student.grade = '';
        });
    },
    deleteStudent(id) {
      axios.delete(`/api/students/${id}`)
        .then(() => {
          this.getStudents();
        });
    }
  }
};
</script>

4. 运行工程

以上是一个简单的示例代码，具体实现需要根据实际需求进行调整。