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JavaWeb之网上图书商城-框架搭建

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.Final import 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.Final import 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.xsd   http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd   http://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 stub  BeanFactory 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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