用java和sql sever写一个学生信息管理系统

以下是一个简单的学生信息管理系统的Java代码和SQL Server数据库：

Java代码：

import java.sql.*;

public class StudentManagementSystem {
    
    // Establishing a database connection
    private static Connection getConnection() {
        Connection con = null;
        try {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            String url = "jdbc:sqlserver://localhost:1433;databaseName=student_db";
            String username = "sa";
            String password = "password";
            con = DriverManager.getConnection(url, username, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return con;
    }
    
    // Adding a new student to the database
    public static void addStudent(String name, int age, String gender, String address, String phone) {
        try {
            Connection con = getConnection();
            PreparedStatement ps = con.prepareStatement("insert into students(name, age, gender, address, phone) values(?,?,?,?,?)");
            ps.setString(1, name);
            ps.setInt(2, age);
            ps.setString(3, gender);
            ps.setString(4, address);
            ps.setString(5, phone);
            ps.executeUpdate();
            System.out.println("Student added successfully!");
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    // Updating an existing student in the database
    public static void updateStudent(int id, String name, int age, String gender, String address, String phone) {
        try {
            Connection con = getConnection();
            PreparedStatement ps = con.prepareStatement("update students set name=?, age=?, gender=?, address=?, phone=? where id=?");
            ps.setString(1, name);
            ps.setInt(2, age);
            ps.setString(3, gender);
            ps.setString(4, address);
            ps.setString(5, phone);
            ps.setInt(6, id);
            ps.executeUpdate();
            System.out.println("Student updated successfully!");
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    // Deleting a student from the database
    public static void deleteStudent(int id) {
        try {
            Connection con = getConnection();
            PreparedStatement ps = con.prepareStatement("delete from students where id=?");
            ps.setInt(1, id);
            ps.executeUpdate();
            System.out.println("Student deleted successfully!");
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    // Displaying all students in the database
    public static void viewStudents() {
        try {
            Connection con = getConnection();
            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery("select * from students");
            while (rs.next()) {
                System.out.println("ID: " + rs.getInt("id"));
                System.out.println("Name: " + rs.getString("name"));
                System.out.println("Age: " + rs.getInt("age"));
                System.out.println("Gender: " + rs.getString("gender"));
                System.out.println("Address: " + rs.getString("address"));
                System.out.println("Phone: " + rs.getString("phone"));
                System.out.println();
            }
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    // Main method to test the program
    public static void main(String[] args) {
        addStudent("John Doe", 20, "Male", "123 Main St", "555-1234");
        addStudent("Jane Smith", 21, "Female", "456 Oak Ave", "555-5678");
        viewStudents();
        updateStudent(1, "Johnny Doe", 21, "Male", "123 Main St", "555-1234");
        deleteStudent(2);
        viewStudents();
    }
}

SQL Server数据库：

create database student_db;

use student_db;

create table students(
    id int primary key identity(1,1),
    name varchar(50) not null,
    age int not null,
    gender varchar(10) not null,
    address varchar(100) not null,
    phone varchar(20) not null
);

注意：这只是一个简单的示例程序，实际的学生信息管理系统需要更多的功能和完善的错误处理。同时，本程序的数据库连接信息（url、username、password）应该根据你的实际情况进行修改。