JavaWeb之网上图书商城-框架搭建

来源:转载

一、写在前面

以前一直接触.net相关的web开发,现在猛然使用javaWeb还是很不习惯。就连搭个框架也是第一次,在互联网众多的资料中看了许多,我想是应该本人的需求有点变态,所以花了将近半天时间的才明白是个什么回事。。。

二、谈谈项目架构

因为高中开始接触.net相关的开发所以对于.net相关的开发还是比较 熟悉的,但我在学校学的java方向的开发,而我打算把这两种平台结合起来,使用java做后台也就是服务提供者,将所有业务逻辑在java平台完成并使用我比较熟悉的.net做Web端的开发。这样一来安卓app,web端就都有了。客户端统一通过分布式框架调用服务。找了很久最终选择了 Hprose(网址: http://www.hprose.com/)这一轻量级、跨语言、跨平台、无侵入式、高性能动态远程对象调用引擎库。之所以选择它一方面是因为学习成本低,另一方面是他的跨平台调用非常轻松高效,因为我们要使用.net做web需要调用java发布的服务!大概看了一下Hprose的文档,发现使用内置的HproseServlet发布服务开发速度比较快也比较简单,所以准备使用这种方式发布服务。可问题来了,传统的ssh架构感觉有点重了,准备使用.net开发web端所以感觉没有必要整合Struts,于是就是hibernate+spring+hprose这种架构。

三、数据库设计

一个小网上书城,所以设计的还有欠缺,以实用为主,主要是练手java开发~~。所以使用了navicat简单设计了一下,不过没有设计表关联,取而代之的是后来一个一个添加关系的,发现这个设计工具有点问题,图示:

其实表关联一看就能看出来~~,接下来就是hibernate一些映射了,同样也是使用插件生成model和映射文件

稍作修改就是这样--

三、spring3+hibernate4配置

因为model和映射文件是自动生成所以稍加配置就好,需要注意的是复合主键的设置,自动生成的会把复合主键对应一个复合模型。如商品评论表的复合主键类型:

package com.book.model;// Generated 2015-11-2 9:07:06 by Hibernate Tools 4.0.0.Finalimport java.util.Date;/** * CommentsId generated by hbm2java */public class CommentsPk implements java.io.Serializable {private Book book;private User user;private Date commentsDate;public CommentsPk() {}public CommentsPk(Book book, User user, Date commentsDate) {this.book = book;this.user = user;this.commentsDate = commentsDate;}public Book getBook() {return this.book;}public void setBook(Book book) {this.book = book;}public User getUser() {return this.user;}public void setUser(User user) {this.user = user;}public Date getCommentsDate() {return this.commentsDate;}public void setCommentsDate(Date commentsDate) {this.commentsDate = commentsDate;}public boolean equals(Object other) {if ((this == other))return true;if ((other == null))return false;if (!(other instanceof CommentsPk))return false;CommentsPk castOther = (CommentsPk) other;return ((this.getBook() == castOther.getBook()) || (this.getBook() != null && castOther.getBook() != null&& this.getBook().equals(castOther.getBook())))&& ((this.getUser() == castOther.getUser()) || (this.getUser() != null && castOther.getUser() != null&& this.getUser().equals(castOther.getUser())))&& ((this.getCommentsDate() == castOther.getCommentsDate())|| (this.getCommentsDate() != null && castOther.getCommentsDate() != null&& this.getCommentsDate().equals(castOther.getCommentsDate())));}public int hashCode() {int result = 17;result = 37 * result + (getBook() == null ? 0 : this.getBook().hashCode());result = 37 * result + (getUser() == null ? 0 : this.getUser().hashCode());result = 37 * result + (getCommentsDate() == null ? 0 : this.getCommentsDate().hashCode());return result;}}

商品评论表模型:

package com.book.model;// Generated 2015-10-30 14:56:21 by Hibernate Tools 4.0.0.Finalimport java.sql.Date;/** * Comments generated by hbm2java */public class Comments implements java.io.Serializable {private String content;private String pic;private Integer client;private CommentsPk id;public Comments(){}public String getContent() {return content;}public void setContent(String content) {this.content = content;}public String getPic() {return pic;}public void setPic(String pic) {this.pic = pic;}public Integer getClient() {return client;}public void setClient(Integer client) {this.client = client;}public CommentsPk getId() {return id;}public void setId(CommentsPk id) {this.id = id;}public Comments(String content, String pic, Integer client, CommentsPk id) {super();this.content = content;this.pic = pic;this.client = client;this.id = id;}}

相应的Hibernate 映射文件:

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><!-- Generated 2015-10-30 14:56:21 by Hibernate Tools 4.0.0.Final --><hibernate-mapping><class name="com.book.model.Comments" table="comments" catalog="bookstore"><composite-id name="id" class="com.book.model.CommentsPk"><key-many-to-one name="book" class="com.book.model.Book"><column name="BookID" /></key-many-to-one><key-many-to-one name="user" class="com.book.model.User"><column name="UserID" /></key-many-to-one><key-property name="commentsDate" type="timestamp"><column name="CommentsDate" length="19" /></key-property></composite-id><property name="content" type="string"><column name="Content" length="65535" /></property><property name="pic" type="string"><column name="Pic" length="65535" /></property><property name="client" type="java.lang.Integer"><column name="Client" /></property></class></hibernate-mapping>

因为商品评论表有两个是外键所以使用了 key-many-to-one标签。

由于采用spring3.2+hibernate4.1所以得到sessionFactory的方式只限于sessionFactory.getCurrentSession();但是必须开启事物:

<bean id="transactionManager"class="org.springframework.orm.hibernate4.HibernateTransactionManager"><property name="sessionFactory" ref="sessionFactory" /></bean><!-- 事务的传播特性 --><tx:advice id="txadvice" transaction-manager="transactionManager"><tx:attributes><tx:method name="add*" propagation="REQUIRED" /><tx:method name="delete*" propagation="REQUIRED" /><tx:method name="modify*" propagation="REQUIRED" /> <!--hibernate4必须配置为开启事务 否则 getCurrentSession()获取不到--><tx:method name="*" propagation="REQUIRED" read-only="true" /></tx:attributes></tx:advice>

以上都是我配置的时候出现问题的地方。

一下是spring配置文件:

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"><!-- 启用spring注解支持 --><context:annotation-config /><bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /><property name="url"value="jdbc:mysql://127.0.0.1/bookstore?useUnicode=true&characterEncoding=UTF-8" /><property name="username" value="root" /><property name="password" value="yangyang" /></bean><!-- 可追加配置二级缓存 --><bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" ><property name="dataSource" ref="dataSource"/><property name="mappingDirectoryLocations"> <list> <value>classpath:config</value> </list></property><property name="hibernateProperties"><props><prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop><prop key="hibernate.show_sql">true</prop><prop key="hibernate.hbm2ddl.auto">update</prop><prop key="hibernate.temp.use_jdbc_metadata_defaults">false</prop><prop key="current_session_context_class">thread</prop></props></property></bean><!-- 配置事务管理器 --><bean id="transactionManager"class="org.springframework.orm.hibernate4.HibernateTransactionManager"><property name="sessionFactory" ref="sessionFactory" /></bean><!-- 事务的传播特性 --><tx:advice id="txadvice" transaction-manager="transactionManager"><tx:attributes><tx:method name="add*" propagation="REQUIRED" /><tx:method name="delete*" propagation="REQUIRED" /><tx:method name="modify*" propagation="REQUIRED" /> <!--hibernate4必须配置为开启事务 否则 getCurrentSession()获取不到--><tx:method name="*" propagation="REQUIRED" read-only="true" /></tx:attributes></tx:advice><!-- 那些类那些方法使用事务 --><aop:config> <!-- 只对业务逻辑层实施事务 --><aop:pointcut id="allManagerMethod"expression="execution(* com.book.test.*.*(..))" /><aop:advisor pointcut-ref="allManagerMethod" advice-ref="txadvice" /></aop:config><bean name="basedao" class="com.book.dao.impl.AdressDao" /><bean name="orderdao" class="com.book.dao.impl.OrderDao" /></beans>

一切就绪之后我们使用servlet测试:

<servlet> <servlet-name>test</servlet-name> <servlet-class>com.book.test.Test</servlet-class></servlet><servlet-mapping> <servlet-name>test</servlet-name> <url-pattern>/index</url-pattern></servlet-mapping> protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubBeanFactory factor = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getSession().getServletContext());OrderDao dao= factor.getBean(OrderDao.class);Object[] list= dao.get(1).getOrderitems().toArray();System.out.println(((Orderitem)list[0]).getOrdercount());}

因为没有使用structs我们需要自己查找spring的BeanFactory来获得dao bean 这也是需要注意的地方,纠结好久。

运行结果:

成功加载订单表订单1项目订购数量。

毕竟第一次使用java开发这类项目,慢慢学习吧~~


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