更新操作：实现的方式，其中先编写DAO文件和数据库的连接
<%@page pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>
<%@page import="com.shaoye.Employee.EmployeeDAO"%>
<%@page import="com.shaoye.Employee.Employ"%>
<%@page import="java.util.Date"%>
<%@page import="java.text.SimpleDateFormat"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>修改员工信息</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="css/style.css" />
</head>
<body>
<div id="wrap">
<div id="top_content">
<div id="header">
<div id="rightheader">
<p>
<%
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String str = sdf.format(date);
%>
<%=str%>
<br />
</p>
</div>
<div id="topheader">
<h1 id="title">
<a href="#">Main</a>
</h1>
</div>
<div id="navigation">
</div>
</div>
<div id="content">
<p id="whereami">
</p>
<h1>
修改员工信息:
</h1>
<form action="updateEmp_ok.jsp" method="post">
<%
int id = Integer.parseInt(request.getParameter("id"));
EmployeeDAO dao =new EmployeeDAO();
Employ emp=dao.findById(id);
%>
<table cellpadding="0" cellspacing="0" border="0"
class="form_table">
<tr>
<td valign="middle" align="right">
id:
</td>
<td valign="middle" align="left">
<%=id %>
<input type="hidden" value="<%=id %>" name="id">
</td>
</tr>
<tr>
<td valign="middle" align="right">
姓名:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="name"
value="<%=emp.getName() %>" />
</td>
</tr>
<tr>
<td valign="middle" align="right">
薪水:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="salary"
value="<%=emp.getSalary() %>" />
</td>
</tr>
<tr>
<td valign="middle" align="right">
年龄:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="age"
value="<%=emp.getAge() %>" />
</td>
</tr>
</table>
<p>
<input type="submit" class="button" value="确认更新" />
</p>
</form>
</div>
</div>
<div id="footer">
<div id="footer_bg">
ABC@126.com
</div>
</div>
</div>
</body>
</html>
更新的逻辑页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="com.shaoye.Employee.Employ"%>
<%@page import="com.shaoye.Employee.EmployeeDAO"%>
<%
request.setCharacterEncoding("utf-8");
response.setContentType("utf-8");
int id = Integer.parseInt(request.getParameter("id"));
String name = request.getParameter("name");
double salary = Double.parseDouble(request.getParameter("salary"));
int age = Integer.parseInt(request.getParameter("age"));
Employ emp = new Employ();
emp.setAge(age);
emp.setId(id);
emp.setName(name);
emp.setSalary(salary);
EmployeeDAO dao = new EmployeeDAO();
dao.modify(emp);
response.sendRedirect("listEmp.jsp");
%>
增加页面：
<%@page contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@page import="java.util.Date"%>
<%@page import="java.text.SimpleDateFormat"%>
<%@page import="com.shaoye.Employee.EmployeeDAO"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>添加员工信息</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="css/style.css" />
</head>
<body>
<div id="wrap">
<div id="top_content">
<div id="header">
<div id="rightheader">
<p>
<%
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String str = sdf.format(date);
%>
<%=str%>
<br />
</p>
</div>
<div id="topheader">
<h1 id="title">
<a href="#">Main</a>
</h1>
</div>
<div id="navigation">
</div>
</div>
<div id="content">
<p id="whereami">
</p>
<h1>
添加员工信息:
</h1>
<form action="addEmp_ok.jsp" method="post">
<table cellpadding="0" cellspacing="0" border="0"
class="form_table">
<tr>
<td valign="middle" align="right">
姓名:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="name" />
</td>
</tr>
<tr>
<td valign="middle" align="right">
薪水:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="salary" />
</td>
</tr>
<tr>
<td valign="middle" align="right">
年龄:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="age" />
</td>
</tr>
</table>
<p>
<input type="submit" class="button" value="提交" />
</p>
</form>
</div>
</div>
<div id="footer">
<div id="footer_bg">
ABC@126.com
</div>
</div>
</div>
</body>
</html>
增加的逻辑页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="com.shaoye.Employee.Employ"%>
<%@page import="com.shaoye.Employee.EmployeeDAO"%>
<%
request.setCharacterEncoding("utf-8");
response.setContentType("utf-8");
String name = request.getParameter("name");
double salary = Double.parseDouble(request.getParameter("salary"));
int age = Integer.parseInt(request.getParameter("age"));
Employ emp = new Employ();
emp.setAge(age);
emp.setName(name);
emp.setSalary(salary);
EmployeeDAO dao= new EmployeeDAO();
dao.save(emp);
response.sendRedirect("listEmp.jsp");
%>
删除页面存在逻辑页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="com.shaoye.Employee.EmployeeDAO"%>
<%
request.setCharacterEncoding("utf-8");
response.setContentType("utf-8");
int id =Integer.parseInt(request.getParameter("id"));
EmployeeDAO dao = new EmployeeDAO();
dao.delete(id);
response.sendRedirect("listEmp.jsp");
%>
查询页面的代码：
<%@page pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>
<%@page import="java.util.Date"%>
<%@page import="java.text.SimpleDateFormat"%>
<%@page import="com.shaoye.Employee.EmployeeDAO"%>
<%@page import="java.util.List"%>
<%@page import="com.shaoye.Employee.Employ"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>员工管理</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="css/style.css" />
<script type="text/javascript">
function showtime(){
var d = new Date();
// 将系统时间的每一个值提取出来
var year = d.getYear();//年
var month = d.getMonth();//月
var day = d.getDate();//日
var hour = d.getHours()>=10 ? d.getHours() : ("0"+d.getHours()); //时
var mi = d.getMinutes()>=10 ? d.getMinutes() : ("0"+d.getMinutes()); //分
var ss = d.getSeconds()>=10 ? d.getSeconds() : ("0"+d.getSeconds());//秒
var t = year+"年"+(month+1)+"月"+day+"日"+" "+hour+":"+mi+":"+ss;
document.getElementById("showTimes").innerHTML=t;
setTimeout(showTime, 1000);
}
</script>
</head>
<body onload="showtime()">
<div id="wrap">
<div id="top_content">
<div id="header">
<div id="rightheader">
<p>
<span id="showTimes"></span>
<br />
</p>
</div>
<div id="topheader">
<h1 id="title">
<a href="#">main</a>
</h1>
</div>
<div id="navigation">
</div>
</div>
<div id="content">
<p id="whereami">
</p>
<h1>
Welcome!
</h1>
<table class="table">
<tr class="table_header">
<td>
ID
</td>
<td>
姓名
</td>
<td>
薪水
</td>
<td>
年龄
</td>
<td>
操作
</td>
</tr>
<%
EmployeeDAO dao = new EmployeeDAO();
List<Employ> employs = dao.findAll();
for(int i =0;i<employs.size();i++){
Employ emp = employs.get(i);
%>
<tr class="row<%=(i%2+1)%>">
<td>
<span> <%=emp.getId() %></span>
</td>
<td>
<%=emp.getName() %>
</td>
<td>
<%=emp.getSalary() %>
</td>
<td>
<%=emp.getAge() %>
</td>
<td>
<a href="delete_ok.jsp?id=<%=emp.getId()%>">删除</a>
<a href="updateEmp.jsp?id=<%=emp.getId()%>">修改</a>
</td>
</tr>
<%} %>
</table>
<p>
<input type="button" class="button" value="添加员工"
onclick="location=‘addEmp.jsp‘" />
</p>
</div>
</div>
<div id="footer">
<div id="footer_bg">
ABC@126.com
</div>
</div>
</div>
</body>
</html>
原文：http://www.cnblogs.com/shaoyefeng/p/4890952.html