如何在Java中捕获材料下拉菜单选择的值？

ComboBox<String> comboBox = new ComboBox<>();
comboBox.getItems().addAll("选项1", "选项2", "选项3");

// 添加事件监听器
comboBox.setOnAction(e -> {
    String selectedValue = comboBox.getValue();
    // 执行相应的操作，如打印选择的值或更新其他UI组件
    System.out.println("选择的值是：" + selectedValue);
});

String[] options = {"选项1", "选项2", "选项3"};
JComboBox<String> comboBox = new JComboBox<>(options);

// 添加事件监听器
comboBox.addActionListener(e -> {
    String selectedValue = (String) comboBox.getSelectedItem();
    // 执行相应的操作，如打印选择的值或更新其他UI组件
    System.out.println("选择的值是：" + selectedValue);
});

<form action="your-servlet-url" method="post">
    <select name="selectedValue">
        <option value="选项1">选项1</option>
        <option value="选项2">选项2</option>
        <option value="选项3">选项3</option>
    </select>
    <input type="submit" value="提交">
</form>

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String selectedValue = request.getParameter("selectedValue");
    // 执行相应的操作，如打印选择的值或返回响应数据给前端
    System.out.println("选择的值是：" + selectedValue);
}