The SSH framework reads data from the database and displays the process

 

1. Create a table of primary categories :

   CREATE TABLE `category` (

     `cid` int(11) NOT NULL AUTO_INCREMENT,

     `cname` varchar(255) DEFAULT NULL,

     PRIMARY KEY (`cid`)

   ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;

    

2. Build packages and corresponding classes :

   * cn.itcast.shop.category

   * action

   * service

   * CategoryService: business layer object

   *dao

   * CategoryDao: Persistence layer object

   * vo

   * Category: entity object

   * Category.hbm.xml: Mapping file

    

3. Configure the Service and DAO :

   * Inject sessionFactory in DAO

   * Inject DAO in Service

    

4. Need to inject first-class service in IndexAction .

   * Action-----Service------Dao

   * Display the data of the first-level classification to the page :

   * Store the data of the first-level classification into the session scope .

   ActionContext.getContext().getSession().put("cList",cList);

   Then read it iteratively in jsp and display

   <s:iterator var="c" value="#session.cList">

        <li><a href="xxx/xxx.html"><s:property value="#c.cname"></a></li>

   </s:iterator>