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示例：
<form action="some.jsp">
<select name="item">
<option value="1">a</option>
<option value="2">b</option>
<option value="3">c</option>
</select>
<input type="submit" value="Submit">
</form>String value = request.getParameter("item"); // 取得的是"1"或"2"或"3"哦.參考：
● How to get the selected value from drop down list in jsp? - Stack Overflow
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