SSH实例(2)

在WebContent\WEB-INF\下新建两个文件：applicationContext.xml和web.xml。

web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" 

    xmlns="http://java.sun.com/xml/ns/javaee" 

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 

    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  

 <filter>

  <filter-name>struts2</filter-name>

  <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>

 </filter>

 

 <filter-mapping>

  <filter-name>struts2</filter-name>

  <url-pattern>/*</url-pattern>

 </filter-mapping>

 

 <listener>

  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

 </listener> 

 

 <welcome-file-list> 

     <welcome-file>index.jsp</welcome-file>

 </welcome-file-list> 

  

</web-app>

web.xml指定了filter和listener。

applicationContext.xml：

<?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:p="http://www.springframework.org/schema/p"

    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <!-- 配置SessionFactory -->

     <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

        <property name="dataSource" >

            <ref local="dataSource"/>

        </property>

        <!-- 配置Hibernate的属性 -->

        <property name="hibernateProperties">

            <props>

                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>

                <prop key="hibernate.show_sql">true</prop>

            </props>

        </property>

        <!-- 指定Hibernate映射文件的路径 -->

        <property name="mappingResources">

            <list>

                <value>com/school/entity/Clas.hbm.xml</value>

            </list>

        </property>

     </bean>

     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">

        <property name="driverClassName">

            <value>com.mysql.jdbc.Driver</value>

        </property>

        <property name="url">

            <value>jdbc:mysql://localhost:3306/myssh

            </value>

        </property>

        <property name="username">

            <value>root</value>

        </property>

        <property name="password">

            <value>root</value>

        </property>

    </bean>

    <bean id="clasDAO"

         class="com.school.dao.ClasDAOImpl"

         abstract="false" lazy-init="default" autowire="default">

         <property name="sessionFactory">

             <ref bean="sessionFactory" />

         </property>

     </bean>    

    <bean id="clasService" class="com.school.service.ClasServiceImpl">

         <property name="clasDAO" ref="clasDAO"></property>

    </bean> 

    <bean id="clasQueryAction" class="com.school.action.ClasQueryAction">

         <property name="clasService" ref="clasService"></property>

     </bean>

    <bean id="clasAction" class="com.school.action.ClasAction">

         <property name="clasService" ref="clasService"></property>

     </bean>

 </beans>

applicationContext.xml定义了多个bean，其中dataSource定义了连接数据库的url、用户名、密码等属性。sessionFactory配置了Hibernate的属性以及映射文件的路径，映射的com/school/entity/Clas.hbm.xml文件如下： 

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

    <class name="com.school.entity.Clas" table="clas">

        <id name="id" type="java.lang.Integer">

            <column name="ID" precision="22" scale="0" />

            <generator class="identity" />

        </id>

        <property name="name" type="java.lang.String">

            <column name="NAME"  length="50" not-null="true">

                <comment>课程名称</comment>

            </column>

        </property>

        <property name="comment" type="java.lang.String">

            <column name="COMMENT" length="500" not-null="false">

                <comment>课程介绍</comment>

            </column>

        </property>

    </class>

</hibernate-mapping>

该文件对应MySQL数据库中的clas表，表的结构如下：

对应的Clas文件如下：

package com.school.entity;



public class Clas {    



    // 课程id

    private int id;

    // 课程名称

    private String name;

    // 课程介绍

    private String comment;

    

    // 默认构造方法

    public Clas() {

    }

    

    // 包含全部属性的构造方法

    public Clas(int id, String name, String comment) {

        super();

        this.id = id;

        this.name = name;

        this.comment = comment;

    }

    

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getComment() {

        return comment;

    }

    public void setComment(String comment) {

        this.comment = comment;

    }



}

在applicationContext.xml中，各个bean之间存在引用关系：

clasDAO对应的类为com.school.dao.ClasDAOImpl,以sessionFactory作为参数；

clasService对应的类为com.school.service.ClasServiceImpl，以clasDAO作为参数；

clasQueryAction对应的类为com.school.action.ClasQueryAction，以clasService作为参数；

clasAction对应的类为com.school.action.ClasAction，以clasService作为参数。