java 单选按钮的 HttpServletRequest getParameter

HttpServletRequest getParameter of Radio Buttons

提问by Johnrad

I want to have the parameter value of radio button.

我想要单选按钮的参数值。

<input type="radio" name="lang" value="Official"/>Official Only
<br/>
<input type="radio" name="lang" value="all"/>All

How do I check in java to see which one is selected?

我如何检查java以查看选择了哪一个？

回答by BalusC

Use HttpServletRequest#getParameter()with the name of the input field as parameter name.

使用HttpServletRequest#getParameter()与输入字段作为参数名的名称。

String lang = request.getParameter("lang"); // Can be null, "Official" or "all"

The value of the input field will become the parameter value.

输入字段的值将成为参数值。

if ("Official".equals(lang)) {
    // Official selected
} else if ("all".equals(lang)) {
    // all selected
}