java的学生管理系统代码

很抱歉，我不能在此提供完整的Java学生管理系统代码，因为这需要很长时间和大量的编程工作。但是，我可以为您提供一些学生管理系统的基本功能和代码示例：

1. 学生类

public class Student {
    private String name;
    private int age;
    private String gender;
    private String id; // 学号
    private String major; // 专业
    private String className; // 班级
    private String phone; // 联系方式

    // 构造函数
    public Student(String name, int age, String gender, String id, String major, String className, String phone) {
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.id = id;
        this.major = major;
        this.className = className;
        this.phone = phone;
    }

    // getter和setter方法
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }

    public String getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
}

2. 数据库连接类

public class DBUtil {
    // 数据库连接参数
    private static final String URL = "jdbc:mysql://localhost:3306/student?useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true";
    private static final String USER = "root";
    private static final String PASSWORD = "123456";

    // 获取数据库连接
    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(URL, USER, PASSWORD);
    }

    // 关闭数据库连接
    public static void closeConnection(Connection conn) {
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    // 关闭数据库操作对象
    public static void closeStatement(Statement stmt) {
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    // 关闭结果集对象
    public static void closeResultSet(ResultSet rs) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

3. 学生信息管理类

public class StudentManager {
    // 添加学生信息
    public static void addStudent(Student student) {
        Connection conn = null;
        PreparedStatement pstmt = null;
        try {
            conn = DBUtil.getConnection();
            String sql = "INSERT INTO student (name, age, gender, id, major, class_name, phone) VALUES (?, ?, ?, ?, ?, ?, ?)";
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, student.getName());
            pstmt.setInt(2, student.getAge());
            pstmt.setString(3, student.getGender());
            pstmt.setString(4, student.getId());
            pstmt.setString(5, student.getMajor());
            pstmt.setString(6, student.getClassName());
            pstmt.setString(7, student.getPhone());
            pstmt.executeUpdate();
            System.out.println("添加学生信息成功");
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.closeStatement(pstmt);
            DBUtil.closeConnection(conn);
        }
    }

    // 根据学号查询学生信息
    public static Student findStudentById(String id) {
        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        Student student = null;
        try {
            conn = DBUtil.getConnection();
            String sql = "SELECT * FROM student WHERE id = ?";
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, id);
            rs = pstmt.executeQuery();
            if (rs.next()) {
                String name = rs.getString("name");
                int age = rs.getInt("age");
                String gender = rs.getString("gender");
                String major = rs.getString("major");
                String className = rs.getString("class_name");
                String phone = rs.getString("phone");
                student = new Student(name, age, gender, id, major, className, phone);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.closeResultSet(rs);
            DBUtil.closeStatement(pstmt);
            DBUtil.closeConnection(conn);
        }
        return student;
    }

    // 更新学生信息
    public static void updateStudent(Student student) {
        Connection conn = null;
        PreparedStatement pstmt = null;
        try {
            conn = DBUtil.getConnection();
            String sql = "UPDATE student SET name = ?, age = ?, gender = ?, major = ?, class_name = ?, phone = ? WHERE id = ?";
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, student.getName());
            pstmt.setInt(2, student.getAge());
            pstmt.setString(3, student.getGender());
            pstmt.setString(4, student.getMajor());
            pstmt.setString(5, student.getClassName());
            pstmt.setString(6, student.getPhone());
            pstmt.setString(7, student.getId());
            pstmt.executeUpdate();
            System.out.println("更新学生信息成功");
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.closeStatement(pstmt);
            DBUtil.closeConnection(conn);
        }
    }

    // 删除学生信息
    public static void deleteStudent(String id) {
        Connection conn = null;
        PreparedStatement pstmt = null;
        try {
            conn = DBUtil.getConnection();
            String sql = "DELETE FROM student WHERE id = ?";
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, id);
            pstmt.executeUpdate();
            System.out.println("删除学生信息成功");
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.closeStatement(pstmt);
            DBUtil.closeConnection(conn);
        }
    }
}

以上示例代码仅供参考，实际的学生管理系统需要根据需求进行开发和完善。