WebContent/WEB-INF/student/edit_myinfo.jsp

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<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>
 <jsp:include page="/WEB-INF/common/header.jsp"/>
<body>
<div class="page-container">

		<form action="StudentServlet?action=update" method="post" class="form form-horizontal" >

			<input type="hidden" value="${student.id}" name="id">
			<input type="hidden" value="${type}" name="type">

			<div class="row cl">
				<label class="form-label col-xs-4 col-sm-2">
					<span class="c-red">*</span>
					学&emsp;&emsp;号：</label>
				<div class="formControls col-xs-3 col-sm-3">
					<input type="text" class="input-text" value="${student.stuno}" placeholder="请输入学号" id="stuno" name="stuno">
				</div>
				<span class="msg" style="color:red;">${requestScope.msg}</span>
			</div>

			<div class="row cl">
				<label class="form-label col-xs-4 col-sm-2">
					<span class="c-red">*</span>
					登录密码：</label>
				<div class="formControls col-xs-3 col-sm-3">
					<input type="text" class="input-text" value="${student.pwd}" placeholder="请输入密码" id="pwd" name="pwd">
				</div>
			</div>
			<div class="row cl">
				<label class="form-label col-xs-4 col-sm-2">
					<span class="c-red">*</span>
					学生姓名：</label>
				<div class="formControls col-xs-3 col-sm-3">
					<input type="text" class="input-text" value="${student.realname}" placeholder="请输入学生姓名" id="realname" name="realname">
				</div>
			</div>


			<div class="row cl">
				<div class="col-9 col-offset-2">
					<button class="btn btn-primary radius"  id="sub_btn" type="submit" >确认修改</button>
				</div>
			</div>
		</form>


</div>
<script>
$(function () {
    // 给注册绑定单击事件
    $("#sub_btn").click(function () {
			//校验学号
		var stunoText = $("#stuno").val();