用javascript实现,
<script language="javascript">
for(i=0;i<form.mingcheng.options.length;i++){
if(form.mingcheng.options[i].value=="nihao"){
form.mincheng.value="nihao";
break;
}
}
</script>
<script language="javascript">
for(i=0;i<form.mingcheng.options.length;i++){
if(form.mingcheng.options[i].value=="nihao"){
form.mincheng.value="nihao";
break;
}
}
</script>
<c:if test=${roe[1]=='nihao'}>out.println("selected")</c:if>
><c:out value="${row[1]}" /></option>