登录验证和EasyUI的初识

今天开始试着做项目:学生信息管理系统.网上也有好多源码,于是,参照源码我就开始学习如何做项目

今天就做了登录验证,看了点EasyUI

 * 登录验证页面

 1 package org.ylfeiu.web;
 2 
 3 import java.io.IOException;
 4 import java.sql.Connection;
 5 import java.sql.SQLException;
 6 
 7 import javax.servlet.ServletException;
 8 import javax.servlet.http.HttpServlet;
 9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11 import javax.servlet.http.HttpSession;
12 
13 import org.ylfeiu.dao.UserDao;
14 import org.ylfeiu.entity.User;
15 import org.ylfeiu.utils.DbUtil;
16 import org.ylfeiu.utils.StringUtil;
17 
18 public class LoginServlet extends HttpServlet {
19 
20     DbUtil dbUtil = new DbUtil();
21 
22     UserDao userDao = new UserDao();
23 
24     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
25             throws ServletException, IOException {
26         this.doPost(req, resp);
27     }
28 
29     protected void doPost(HttpServletRequest req, HttpServletResponse resp)
30             throws ServletException, IOException {
31         String name = req.getParameter("username");
32         String passwd = req.getParameter("passwd");
33         // 服务器端验证
34         if (StringUtil.isEmpty(name) || StringUtil.isEmpty(passwd)) {
35             req.setAttribute("err", "用户名或密码不能为空!");//表单数据不合法,给请求设置错误参数
36             req.getRequestDispatcher("login.jsp").forward(req, resp);//并且让其转发到登录页面,服务器端跳转
37             return;
38         }
39         User user = new User(name, passwd);//把当前登录用户实例化
40         Connection conn = null;
41 
42         try {
43             conn = dbUtil.getCon();
44             User currentUser = userDao.login(conn, user);//通过构造将当前用户信息传到userDao中的login方法,该方法返回一个user对象
45                                                         //若当前用户与数据库取出的数据一致,则返回一个对象,否则返回的是null
46             if (currentUser == null) {
47                 req.setAttribute("err", "用户名或密码错误!");
48                 req.getRequestDispatcher("login.jsp").forward(req, resp);
49                 return;
50             } else {
51 
52                 HttpSession session = req.getSession();
53 
54                 session.setAttribute("currentUser", currentUser);//给session设置参数,用于验证用户是否登录
55 
56                 resp.sendRedirect("main.jsp");//客户端跳转,重定向到登录成功页面
57             }
58 
59         } catch (Exception e) {
60 
61             e.printStackTrace();
62         } finally {
63             try {
64                 conn.close();
65             } catch (SQLException e) {
66 
67                 e.printStackTrace();
68             }
69         }
70 
71     }
72 
73 }

 * 后台管理主页面

<%@ page language="java" contentType="text/html; charset=utf-8"
	pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>学生信息管理系统主界面</title>
<%
	// 权限验证
	if (session.getAttribute("currentUser") == null) {
		response.sendRedirect("index.jsp");
		return;
	}
%>
<link rel="stylesheet" type="text/css"
	href="jquery-easyui-1.3.3/themes/default/easyui.css">
<link rel="stylesheet" type="text/css"
	href="jquery-easyui-1.3.3/themes/icon.css">
<script type="text/javascript" src="jquery-easyui-1.3.3/jquery.min.js"></script>
<script type="text/javascript"
	src="jquery-easyui-1.3.3/jquery.easyui.min.js"></script>
<script type="text/javascript"
	src="jquery-easyui-1.3.3/locale/easyui-lang-zh_CN.js"></script>
<script type="text/javascript">
	$(function() {
		// 数据,树型菜单,一个对象(json)数组,子菜单又是对象数组
		var treeData = [ {
			text : "根",
			children : [ {
				text : "班级信息管理",
				attributes : {
					url : "gradeInfoManage.jsp" //ajax异步通信
				}
			}, {
				text : "学生信息管理",
				attributes : {
					url : "studentInfoManage.jsp"
				}
			} ]

		} ];

		// 实例化树菜单
		$("#tree").tree({
			data : treeData,
			lines : true,
			onClick : function(node) {//node是点击菜单后传过来的节点(不包含根节点)
				if (node.attributes) {
					openTab(node.text, node.attributes.url);
				}
			}
		});

		// 新增Tab
		function openTab(text, url) {
			if ($("#tabs").tabs('exists', text)) {
				$("#tabs").tabs('select', text);
			} else {
				var content = "<iframe frameborder='0' scrolling='auto' style='width:100%;height:100%' src="
						+ url + "></iframe>";
				$("#tabs").tabs('add', {
					title : text,
					closable : true,
					content : content
				});
			}
		}
	});
</script>
</head>
<body class="easyui-layout">
	<div region="north" style="height: 80px; background-color: #E0EDFF">
		<div align="left" style="width: 80%; float: left">
			<img src="images/main.jpg">
		</div>
		<div style="padding-top: 50px; padding-right: 20px;">
			当前用户： <font color="red">${currentUser.userName }</font><!--通过了session验证后的用户 --->
		</div>

	</div>
	<div region="center">
		<div class="easyui-tabs" fit="true" border="false" id="tabs">
			<div title="首页">
				<div align="center" style="padding-top: 100px;">
					<font color="red" size="10">欢迎使用</font>
				</div>
			</div>
		</div>
	</div>
	<div region="west" style="width: 150px;" title="导航菜单" split="true">
		<ul id="tree"></ul>
	</div>
	<div region="south" style="height: 25px;" align="center">
		版权所有<a href="http://www.baidu.com">www.baidu.com</a>
	</div>
</body>
</html>

ps:个人觉得Javascript比较灵活,又不失强大,需要好好学习它　　

posted @ 2014-03-17 21:01  烫烫烫烫  阅读(763)  评论(0)  编辑  收藏  举报