第二章：用户登录管理模块
本章简介
1.项目分层
2.创建MyHibernateSessionFactory
3.设计用户接口和实现类
4.设计所有Action父类
5.设计用户Action类
6.页面调用
7.完成显示登录成功用户名和注销功能
8.显示报错信息
1.项目分层
- 实体层（模型层）：entity包 学生类、用户类
- 数据库层（模型层）：db包
- 接口层（模型层）：service包
- 接口实现层（模型层）：service.impl包
- 动作层（控制层）：action包
- Jsp页面（视图层）：整个项目所有的JSP页面
2.创建MyHibernateSessionFactory（会话工厂工具类）
- 创建自定义的session工厂类
将来我们可以调用工具类getSessionFactory()静态方法，返回会话工厂的一个实例
会话工厂工具类MyHibernateSessionFactory.java
package db;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
public class MyHibernateSessionFactory {
private static SessionFactory sessionFactory;//会话工厂属性
//构造方法私有化。保证单例模式
private MyHibernateSessionFactory(){
}
//公有的静态方法，获得会话工厂对象
public static SessionFactory getSessionFactory()
{
if(sessionFactory==null)
{
Configuration config=new Configuration().configure();
ServiceRegistry serviceRegistry=new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();
sessionFactory=config.buildSessionFactory(serviceRegistry);
return sessionFactory;
}
else
{
return sessionFactory;
}
}
}
3.设计用户接口和实现类
- 用户业务逻辑接口：包含跟用户相关的所有一些方法，比方说用户的登录、注销等
- 用户业务逻辑实现类：接口当中的方法都是抽象的，没有实现，我们还要实现它具体的接口实现类
用户业务逻辑接口
package service;
import entity.Users;
//用户业务逻辑接口
public interface UsersDAO {
//用户登录方法
public boolean usersLogin(Users u);
}
用户业务逻辑实现类
package service.impl;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import db.MyHibernateSessionFactory;
import entity.Users;
import service.UsersDAO;
public class UsersDAOImpl implements UsersDAO{
public boolean usersLogin(Users u) {
// TODO Auto-generated method stub
//事务对象
Transaction tx = null;
String hql = "";
try
{
Session session = MyHibernateSessionFactory.getSessionFactory().getCurrentSession();
tx=session.beginTransaction();//开启事务
hql = "from Users where username=? and password=?";//?是占位符，两个问号表示两个参数
Query query = session.createQuery(hql);//传入hql语句
query.setParameter(0, u.getUsername());//传递参数（由于上面的hql语句用了两个占位符表示要传入两个参数）
query.setParameter(1, u.getPassword());
List list=query.list();//查询，返回结果集
tx.commit();//提交事务
//判断是否查到用户
if(list.size()>0)
{
return true;
}
else
{
return false;
}
}
catch(Exception ex)
{
ex.printStackTrace();//打印异常堆栈
return false;
}
finally
{
if(tx!=null)
{
//tx.commit();//不能重复提交事务
tx=null;
}
}
}
}
测试方法是否正确
package service.impl;
import junit.framework.Assert;
import org.junit.Test;
import service.UsersDAO;
import entity.Users;
public class TestUsersDAOImpl {
@Test
public void testUsersLogin()
{
Users u= new Users(1,"zhangsan","123456");
UsersDAO udao=new UsersDAOImpl();
Assert.assertEquals(true, udao.usersLogin(u));//断言
}
}
4.设计所有Action父类
- 设计action父类
- 继承ActionSupport（ActionSupport内置了很多拦截器，方便我们以后的使用）
- 为了获得常用的内置对象采用耦合IOC方式注入属性。
需要实现以下三个接口：
ServletRequestAware
ServletResponseAware
ServletContextAware
package action;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.util.ServletContextAware;
import com.opensymphony.xwork2.ActionSupport;
//所有Action动作的父类
public class SuperAction extends ActionSupport implements ServletRequestAware,ServletResponseAware,ServletContextAware{
/**
*
*/
private static final long serialVersionUID = 1L;
protected HttpServletRequest request;//请求对象
protected HttpServletResponse response;//响应对象
protected HttpSession session;//会话对象
protected ServletContext application;//全局对象
public void setServletContext(ServletContext application) {
// TODO Auto-generated method stub
this.application=application;
}
public void setServletResponse(HttpServletResponse response) {
// TODO Auto-generated method stub
this.response=response;
}
public void setServletRequest(HttpServletRequest request) {
// TODO Auto-generated method stub
this.request=request;
this.session=this.request.getSession();
}
}
5.设计用户Action类
- 设计用户Action类，采用模型驱动接收表单数据。
struts2接收表单数据的方式：普通属性、领域对象、模型驱动
设计用户Action类
package action;
import service.UsersDAO;
import service.impl.UsersDAOImpl;
import com.opensymphony.xwork2.ModelDriven;
import entity.Users;
public class UsersAction extends SuperAction implements ModelDriven<Users>{
/**
*
*/
private static final long serialVersionUID = 1L;
private Users user=new Users();
//用户登录动作
public String login()
{
UsersDAO udao = new UsersDAOImpl();
if(udao.usersLogin(user))
{
return "login_success";//返回一个结果集
}
else
{
return "login_failure";
}
}
public Users getModel() {
// TODO Auto-generated method stub
return this.user;
}
}
需要在struts.xml配置文档当中来注册
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="default" namespace="/" extends="struts-default">
</package>
<package name="users" namespace="/users" extends="default">
<action name="*_*" class="action.{1}Action" method="{2}">
<result name="login_success">/users/Users_login_success.jsp</result>
<result name="login_failure">/users/Users_login.jsp</result>
</action>
</package>
</struts>
6.页面调用
- 登录页面调用用户登录动作。
User_login.jsp
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8" %>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!-- 这是一个html5 doctype声明 -->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>用户登录</title>
</head>
<style type="text/css">
body{
margin:0px;
padding:0px;
overflow:hidden;
}
#wrapper{
position:absolute;
width:100%;
height:100%;
min-width:1280px;
min-height:680px;
overflow-x:hidden;
overflow-y:hidden;
background-image: -moz-linear-gradient(top,#77D1F6, #2F368F);
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #77D1F6),color-stop(1, #2F368F));
}
#header{
height:100px;
width:100%;
}
#logo{
position:absolute;
float:left;
margin-left:5%;
margin-top:30px;
height:40px;
width:160px;
text-align:center;
}
#heading{
position:relative;
float:left;
margin-left:20%;
margin-top:-18px;
height:110px;
width:60%;
border-radius: 18px;
background-color:#1C75BC;
opacity:0.6;
}
#heading #title{
margin-top:40px;
text-align:center;
font-family:微软雅黑;
font-size:24px;
font-weight:bold;
}
#heading #subTitle{
margin-top:10px;
text-align:center;
font-family:Courier New;
}
#main{
margin-top:20px;
height:500px;
width:100%;
}
#mainBg{
position:relative;
float:left;
margin-left:20%;
margin-top:0px;
height:500px;
width:60%;
border-radius: 18px;
background-color:#000000;
opacity:0.5;
}
#mainPanel{
position:relative;
margin:25px;
height:450px;
border-radius: 18px;
background-image: -moz-linear-gradient(top,#EBEBEB, #BFBFBF);
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #EBEBEB),color-stop(1, #BFBFBF));
}
#mainPanel #left{
float:left;
border-right:2px solid #F6F6F6;
position:relative;
top:10%;
height:80%;
width:49%;
border-right-style:groove;
}
#mainPanel #image{
position:relative;
height:256px;
width:256px;
left:15%;
top:12%;
background-image:url('../images/admin.png');
}
#mainPanel #right{
float:left;
position:relative;
height:90%;
width:49%;
top:5%;
}
#welcome{
margin-top:20px;
height:60px;
width:100%;
vertical-align: middle;
display: inline-block;
line-height: 60px;
text-align:center;
}
#welcome #welcome-text{
font-size:38px;
font-weight:bold;
font-family:微软雅黑;
text-shadow: 0 1px 1px #F6F6F6;
}
#user-name{
height:35px;
width:100%;
margin-top:20px;
vertical-align: middle;
display: inline-block;
line-height: 35px;
}
#user-password{
margin-top:20px;
height:35px;
width:100%;
vertical-align: middle;
display: inline-block;
line-height: 35px;
}
#user-checkcode{
margin-top:20px;
height:35px;
width:100%;
vertical-align: middle;
display: inline-block;
line-height: 35px;
}
#button-group{
margin-top:10px;
height:35px;
width:100%;
vertical-align: middle;
display: inline-block;
line-height: 35px;
text-align:center;
}
#error-tip{
margin-top:20px;
margin-left:5%;
height:40px;
width:90%;
vertical-align: middle;
display: inline-block;
line-height: 35px;
text-align:center;
border-bottom:2px solid #F6F6F6;
border-bottom-style:groove;
}
#error-tip #tip-text{
font-size:18px;
font-weight:bold;
font-family:微软雅黑;
color:red;
}
.item{
margin-left:20px;
font-family:微软雅黑;
font-size:20px;
font-weight:bold;
float: left;
width:80px;
margin-top: 3px;
text-align: center;
text-shadow: 0 1px 1px #F6F6F6;
}
.input{
vertical-align: middle;
display: inline-block;
}
#checkcode-img{
margin-top:3px;
height:20px;
width:60px;
}
.form-input{
height:20px;
}
.btn{
border:1px solid #cccccc;
cursor:pointer;
margin:10px 5px;
height:40px;
width:80px;
text-align:center;
border-radius: 4px;
border-color: #636263 #464647 #A1A3A5;
text-shadow: 0 1px 1px #F6F6F6;
background-image: -moz-linear-gradient(center top, #D9D9D9, #A6A6A6 49%, #A6A6A6 50%);
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #D9D9D9),color-stop(1, #A6A6A6));
}
#footer{
margin-top:20px;
width:100%;
}
#footer #text{
text-align:center;
font-size:14px;
font-family:微软雅黑;
font-weight:bold;
}
</style>
<body>
<div id="wrapper">
<div id="header">
<div id="logo"></div>
<div id="heading">
<div id="title">后台管理系统</div>
<div id="subTitle">Ver 1.0</div>
</div>
</div>
<div id="main">
<div id="mainBg">
<div id="mainPanel">
<div id="left">
<div id="image"></div>
</div>
<div id="right">
<form name="loginForm" action="<%=path%>/users/Users_login.action" method="post">
<!-- start of login form -->
<div id="welcome">
<span id="welcome-text">管 理 登 录</span>
</div>
<div id="user-name">
<span class="item">用户名:</span>
<span><input type="text" name="username" class="form-input"></span>
</div>
<div id="user-password">
<span class="item">密 码:</span>
<span class="input"><input type="password" name="password" class="form-input"></span>
</div>
<div id="button-group">
<input type="submit" class="btn" value="登录"/>
<input type="reset" class="btn" value="重置"/>
</div>
<div>
<s:fielderror/> <!-- 显示表单验证的出错信息 -->
</div>
<!-- end of form -->
</form>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="text">Copyright © 2009-2015 All Rights Reserved Powered By Simoniu</div>
</div>
</div>
</body>
</html>
7.完成显示登录成功用户名和注销功能
8.显示报错信息
- 在登录表单上显示表单验证出错信息
