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;
	100%;
	height:100%;
	min-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;
	100%;
}
#logo{
	position:absolute;
	float:left;
	margin-left:5%;
	margin-top:30px;
	height:40px;
	160px;
	text-align:center;
}
#heading{
	position:relative;
	float:left;
	margin-left:20%;
	margin-top:-18px;
	height:110px;
	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;
	100%;
}
#mainBg{
	position:relative;
	float:left;
	margin-left:20%;
	margin-top:0px;
	height:500px;
	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%;
	49%;
	border-right-style:groove;
}
#mainPanel #image{
	position:relative;
	height:256px;
	256px;
	left:15%;
	top:12%;
	background-image:url('../images/admin.png');
}
#mainPanel #right{
	float:left;
	position:relative;
	height:90%;
	49%;
	top:5%;
}
#welcome{
	margin-top:20px;
	height:60px;
	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;
	100%;
	margin-top:20px;
	vertical-align: middle;
	display: inline-block;
	line-height: 35px;
}
#user-password{
	margin-top:20px;
	height:35px;
	100%;
	vertical-align: middle;
	display: inline-block;
	line-height: 35px;
}
#user-checkcode{
	margin-top:20px;
	height:35px;
	100%;
	vertical-align: middle;
	display: inline-block;
	line-height: 35px;
}
#button-group{
	margin-top:10px;
	height:35px;
	100%;
	vertical-align: middle;
	display: inline-block;
	line-height: 35px;
	text-align:center;
}
#error-tip{
	margin-top:20px;
	margin-left:5%;
	height:40px;
	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;
	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;
	60px;
}
.form-input{
	height:20px;
}
.btn{
    border:1px solid #cccccc;
    cursor:pointer;
    margin:10px 5px;
    height:40px;
	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;
	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