今天完成多条件查询的功能：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="dao.DBUtil" %>
<%@ page import="bean.student" %>
<%@page import = "java.sql.*" %>
<%@page import = "java.util.*" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>首页</title>
<script src="js/jquery-1.11.3.min.js"></script>
<style>
table{
50%;
margin: 0 auto;
border:0;
background:#CCC;
color:#000;
line-height:40px;
font-size: 1.2em;
}
body{
background: url("img.png") no-repeat;
background-size: cover;
}
</style>
</head>
<body>
<%
String sql="select * from student";
Connection conn= DBUtil.getConnection();
PreparedStatement papre=conn.prepareStatement(sql);
ResultSet rs=papre.executeQuery();
List<student> list=new ArrayList<>();
while(rs.next()){
student stu=new student();
stu.setNum(rs.getString("num"));
stu.setName(rs.getString("name"));
stu.setSex(rs.getString("sex"));
stu.setDate(rs.getString("date"));
stu.setAddress(rs.getString("address"));
list.add(stu);
}
%>
<h1 align="center"><span style="color:red">学生管理</span></h1>
<div>
<table border="1" align="center">
<tr>
<td colspan="4" align="center">
<a href="insert.jsp">添加信息</a>
</td>
<td colspan="3" align="center">
<a href="query.jsp">查询信息</a>
</td>
</tr>
<tr>
<td>学号</td>
<td>姓名</td>
<td>性别</td>
<td>出生年月</td>
<td>地址</td>
<td colspan="2">操作</td>
</tr>
<tr>
<c:forEach items="<%=list %>" var="item" varStatus="status">
<tr>
<td>${item.num}</td>
<td>${item.name}</td>
<td>${item.sex}</td>
<td>${item.date}</td>
<td>${item.address}</td>
<td><a href="Servlet?method=delete&num=${item.num}">删除</a></td>
<td><a href="update.jsp?num=${item.num}&name=${item.name}&date=${item.date}&sex=${item.sex}&address=${item.address}">修改</a></td>
</tr>
</c:forEach>
</tr>
</table>
</div>
</body>
</html>