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使用jstl，引用jstl.1.2
jsp开头为
<%@ page language="java" contentType="text/html; charset=UTF-8" import="java.util.*"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>默认的方法
<select class="form-control" id="sex" name="sex">
<option value="男">男</option>
<option value="女"
<c:if test="${buyer.sex=='女'}">selected="selected"</c:if>
>女</option>
</select>