Java实习模拟面试之用户注册页面设计与实现方法示例

function validateForm() {
    var username = document.getElementById("username").value;
    var password = document.getElementById("password").value;
    var confirmPassword = document.getElementById("confirmPassword").value;
    var realName = document.getElementById("realName").value;
    var age = document.getElementById("age").value;

    if (username === "" || password === "" || confirmPassword === "" || realName === "" || age === "") {
        alert("请输入所有必填项！");
        return false;
    }

    if (password !== confirmPassword) {
        alert("两次输入的密码不一致！");
        return false;
    }

    if (age < 1 || age > 100) {
        alert("年龄必须在1到100之间！");
        return false;
    }

    return true;
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    String realName = request.getParameter("realName");
    int age = Integer.parseInt(request.getParameter("age"));

    // 数据验证
    if (isUsernameExist(username)) {
        response.getWriter().write("用户名已存在！");
        return;
    }

    // 数据处理
    saveUserToDatabase(username, password, realName, age);

    // 响应结果
    response.getWriter().write("注册成功！");
}

private boolean isUsernameExist(String username) {
    // 查询数据库判断用户名是否存在
    return false; // 示例代码，实际逻辑需实现
}

private void saveUserToDatabase(String username, String password, String realName, int age) {
    // 将用户信息保存到数据库
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    try {
        // 数据处理逻辑
    } catch (SocketTimeoutException e) {
        response.getWriter().write("网络连接超时，请稍后再试！");
    } catch (IOException e) {
        response.getWriter().write("网络错误，请检查网络连接！");
    }
}