以上代码怎么实现

好的，以下是一个简单的实现示例，包括JSP文件、Servlet和DAO类的代码：

JSP文件（employee.jsp）：

<form action="addEmployee" method="post">
    <label>姓名：</label><input type="text" name="name"><br>
    <label>工号：</label><input type="text" name="id"><br>
    <label>性别：</label><input type="radio" name="gender" value="male" checked>男
                    <input type="radio" name="gender" value="female">女<br>
    <label>部门：</label><input type="text" name="department"><br>
    <input type="submit" value="添加员工">
</form>

Servlet（AddEmployeeServlet.java）：

@WebServlet("/addEmployee")
public class AddEmployeeServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 获取表单数据
        String name = request.getParameter("name");
        String id = request.getParameter("id");
        String gender = request.getParameter("gender");
        String department = request.getParameter("department");
        // 封装成JavaBean对象
        Employee employee = new Employee(name, id, gender, department);
        // 调用DAO类中的方法，将员工信息插入到数据库中
        EmployeeDAO employeeDAO = new EmployeeDAO();
        boolean success = employeeDAO.addEmployee(employee);
        // 返回提示信息给用户
        if (success) {
            response.getWriter().write("员工信息添加成功！");
        } else {
            response.getWriter().write("员工信息添加失败！");
        }
    }
}

DAO类（EmployeeDAO.java）：

public class EmployeeDAO {
    public boolean addEmployee(Employee employee) {
        Connection conn = null;
        PreparedStatement stmt = null;
        try {
            // 连接数据库
            conn = getConnection();
            // 编写SQL语句
            String sql = "INSERT INTO employee(name, id, gender, department) VALUES (?, ?, ?, ?)";
            // 创建PreparedStatement对象，并设置参数
            stmt = conn.prepareStatement(sql);
            stmt.setString(1, employee.getName());
            stmt.setString(2, employee.getId());
            stmt.setString(3, employee.getGender());
            stmt.setString(4, employee.getDepartment());
            // 执行SQL语句
            int rows = stmt.executeUpdate();
            // 返回插入结果
            return rows > 0;
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            closeConnection(conn, stmt, null);
        }
        return false;
    }
    
    // 获取数据库连接
    private Connection getConnection() throws SQLException {
        // TODO: 实现连接数据库的代码
    }
    
    // 关闭数据库连接
    private void closeConnection(Connection conn, Statement stmt, ResultSet rs) {
        // TODO: 实现关闭数据库连接的代码
    }
}

需要注意的是，上述代码仅为示例，具体实现还需要根据你自己的实际情况进行修改和完善。