spring mvc高级篇(二):Spring+SpringMVC+Mybatis整合

2.1整合思路分析

用Spring对MyBatis进行整合，将使得采用MyBatis操作数据库更加方便和简单。由于Spring 3的开发在MyBatis 3官方发布前就结束了，Spring开发团队不想发布一个基于非发布版本的MyBatis的整合支持，因此Spring 3没有提供对MyBatis3的支持。为了使Spring 3支持MyBatis 3，MyBatis团队开发出整合类，让开发者直接在Spring中使用MyBatis。

 

2.2 Spring和MyBatis整合核心类的介绍

在使用MyBatis-Spring整合之前，我们需要先下载相应的整合JAR包。在MyBatis的官方网站( http://code.google.com/p/mybatis/)上，找到MyBatis Integration，下载整合需要的mybatis-spring-1.2.0-bundle.zip，下载并解压后的目录如下图所示。整合时，在工程中只要包含mybatis-spring-1.2.0.jar就可以了。

MyBatis-Spring包的目录结构

要在Spring中使用MyBatis，需要在Spring的配置文件中定义一些类。下面先了解一下这些核心类。

1. SqlSessionFactoryBean

在MyBatis中，SqlSessionFactory可以使用SqISessionFactoryBuilder来创建，而在MyBatis-Spring中，使用SqISessinFacotryBean来代替，可以直接在Spring通过配置文件的形式配置。

2．MapperFactoryBean

MapperFactoryBean实现了Spring的FactoryBean接口，通过mapperlnterface属性注入接口，将映射接口变成可以注射的Spring Bean。

 

3. SqlSessionTemplate

SqlSessinTemplate类负责管理MyBatis的SqlSession，调用MyBatis的SQL映射语句，轻松实现数据库的访问。SqlSessionTernplate是线程安全的。当调用SQL方法时，包括通过从映射器getMapper()方法返回的映射器的方法，SqlSessionTemplate会保证使用的SqlSession是和当前Spring事务相关联的。此外，它管理会话的生命周期，包括必要的关闭、提交和回滚操作。

 

2.3 开发环境

开发工具:myeclipse8.6.1

数据库:mysql5.5.23

服务器: tomcat6.0.37

框架版本: spring3.2.2+mybatis3.2.2

2.4 案例开发步骤

步骤一:在myeclipse8.6中新建web工程SMMvc，拷贝如下包到lib目下：

 

代码的目录结构如下图所示：

 

步骤二:编写web.xml 配置文件，代码如下：

=================================web.xml========================

<?xmlversion="1.0"encoding="UTF-8"?>

<web-appversion="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">

  <!-- 配置统一错误处理页面start -->

  <error-page>

    <error-code>404</error-code>

    <location>/Err404.html</location>

  </error-page>

  <error-page>

    <error-code>500</error-code>

    <location>/Err500.html</location>

  </error-page>

  <!-- 配置统一错误处理页面end -->

 

  <!-- 配置登录验证过滤器start -->

  <filter>

    <filter-name>loginFilter</filter-name>

    <filter-class>com.wx.filters.LoginFilter</filter-class>

    <!-- 不做拦截的请求-->

    <init-param>

         <param-name>exclusions</param-name>

         <param-value>SMMvc/,.js,.gif,.jpg,.jpeg,.png,.css,.ico,

        Login.jsp,Login.php,Register.jsp,register.php,CheckUser.php,

        ShowOneUser.jsp,ShowResult.jsp,Trans.php,ShowOneUser.php,quit.php

         </param-value>

     </init-param>

  </filter>

  <filter-mapping>

    <filter-name>loginFilter</filter-name>

    <url-pattern>/*</url-pattern>

  </filter-mapping>

  <!-- 配置登录验证过滤器end -->

 

  <!--druid连接池监控  config start -->

  <filter>

     <filter-name>DruidWebStatFilter</filter-name>

     <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>

     <init-param>

         <param-name>exclusions</param-name>

         <param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>

     </init-param>

  </filter>

  <filter-mapping>

     <filter-name>DruidWebStatFilter</filter-name>

     <url-pattern>/*</url-pattern>

  </filter-mapping>

  <servlet>

        <servlet-name>DruidStatView</servlet-name>

        <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>

  </servlet>

  <servlet-mapping>

        <servlet-name>DruidStatView</servlet-name>

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

  </servlet-mapping>

  <!--http://localhost:8080/SMMvc/druid/index.html    end-->

 

  <!-- 配置spring mvc的字符集过滤  start-->

  <filter>

    <filter-name>encode</filter-name>

    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

    <init-param>

      <param-name>encoding</param-name>

      <param-value>UTF-8</param-value>

    </init-param>

    <init-param>

    <param-name>forceEncoding</param-name>

    <param-value>true</param-value>

    </init-param>

  </filter>

  <filter-mapping>

    <filter-name>encode</filter-name>

    <url-pattern>/*</url-pattern>

  </filter-mapping>

  <!-- 配置spring mvc的字符集过滤  end-->

 

  <!--配置 springmvc前端控制器  start-->

  <servlet>

    <servlet-name>springmvc</servlet-name>

    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <init-param>

       <param-name>contextConfigLocation</param-name>

       <param-value>classpath:configs/mvc/springmvc-dispatcher.xml</param-value>

    </init-param>

    <load-on-startup>1</load-on-startup>

  </servlet>

 

  <servlet-mapping>

    <servlet-name>springmvc</servlet-name>

    <url-pattern>*.php</url-pattern>

  </servlet-mapping>

  <!--配置 springmvc前端控制器  end-->

 

  <!-- 加载log4jstart -->

  <context-param>

    <param-name>log4jConfigLocation</param-name>

    <param-value>classpath:configs/log4j.properties</param-value>

  </context-param>

  <listener>

    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>

  </listener>

  <!-- 加载log4j end-->

 

  <!-- 加载spring容器 start-->

  <context-param>

    <param-name>contextConfigLocation</param-name>

    <param-value>classpath:configs/applicationContext.xml</param-value>

  </context-param>

  <listener>

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

  </listener>

  <!-- 加载spring容器 end-->

 

  <welcome-file-list>

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

  </welcome-file-list>

</web-app>

================================================================

知识讲解：Spring需要启动容器才能为其他框架提供服务，由于Web应用程序的人口是被Web服务器控制的，所以，无法在main()方法中通过创建ClassPallXmIApplicationContext对象来启动Spring容器。Spring提供了一个监听器类org.springframework.web．context.ContextLoaderListener来解决这个问题。该监听器实现了ServletContextListener接口，可以在Web容器启动的时候初始化Spring容器。当然，前提是需要在web.xml中配置好这个监听器。具体请参见上面配置代码及相关的注释部分。

  

步骤三：建立mybatis核心配置文件,如下所示:

====================== mybatis-config.xml============================

<?xmlversion="1.0"encoding="UTF-8"?>

<!DOCTYPEconfiguration

    PUBLIC "-//mybatis.org//DTDConfig 3.0//EN"

    "mybatis-3-config.dtd">

<configuration>

<!-- 别名配置 -->

<typeAliases>

    <typeAliastype="com.wx.entitys.UserEntity"alias="userEntity"/>

    <typeAliastype="com.wx.entitys.PageEntity"alias="conEntity"/>

    <typeAliastype="com.wx.entitys.StudentEntity"alias="stuEntity"/>

    <typeAliastype="com.wx.entitys.DeptEntity"alias="deptEntity"/>

    <typeAliastype="com.wx.entitys.PageEntity"alias="pageEntity"/>

   

</typeAliases>

 

</configuration>

=====================================================================

 

步骤四：建立druid数据源的属性文件,如下所示:

========================= druidConfig.properties=====================

driverClassName=com.mysql.jdbc.Driver

url=jdbc\:mysql\://localhost\:3306/schooldb

username=root

password=123456

#配置监控统计拦截的filters，去掉后监控界面sql无法统计

filters=stat

#配置初始化大小

initialSize=6

#配置初始化最大连接数

maxActive=20

#配置最小空闲连接数

minIdle=3

#配置获取连接等待超时的时间,1分钟

maxWait=60000

#检测连接是否有效的SQL

validationQuery=SELECT 'x'

#申请连接的时候检测，如果空闲时间大于timeBetweenEvictionRunsMillis，执行validationQuery检测连接是否有效

testWhileIdle=true

#申请连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能

testOnBorrow=false

#归还连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能

testOnReturn=false

#启用PSCache，必须配置大于0，当大于0时，poolPreparedStatements自动触发修改为true

maxPoolPreparedStatementPerConnectionSize=20

#对于长时间不使用的连接强制关闭

removeAbandoned=true

#超过30秒的空闲连接就可以被关闭了,单位是秒

removeAbandonedTimeout=30

#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒

timeBetweenEvictionRunsMillis=10000

#配置一个连接在池中最小生存的时间，单位是毫秒

minEvictableIdleTimeMillis=30000

=====================================================================

 

步骤五：建立log4j的属性文件,如下所示:

========================= log4j.properties=====================

log4j.rootLogger=INFO, Console

 

#Console

log4j.appender.Console=org.apache.log4j.ConsoleAppender

log4j.appender.Console.layout=org.apache.log4j.PatternLayout

log4j.appender.Console.layout.ConversionPattern=%d[%t] %-5p [%c] %m%n

=====================================================================

 

步骤六：建立spring的核心配置文件,如下所示:

========================= applicationContext.xml=====================

<?xmlversion="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"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

     http://www.springframework.org/schema/aop

     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

     http://www.springframework.org/schema/tx

     http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

    <!-- 导入dao层和service层的bean配置 -->

    <importresource="classpath:configs/spring/applicationContext-*.xml"/>

   

    <!-- 加载druid数据源的属性文件 -->

    <beanid="config"class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">

       <propertyname="location">

           <value>classpath:configs/druidConfig.properties</value>

       </property>

    </bean>

    <!-- druid数据源的配置 -->

    <beanid="druidDataSource"class="com.alibaba.druid.pool.DruidDataSource"init-method="init"destroy-method="close">

       <propertyname="driverClassName"value="${driverClassName}"/>

       <propertyname="url"value="${url}"/>

       <propertyname="username"value="${username}"/>

       <propertyname="password"value="${password}"/>

       <propertyname="filters"value="${filters}"/>

       <propertyname="initialSize"value="${initialSize}"/>

       <propertyname="maxActive"value="${maxActive}"/>

       <propertyname="minIdle"value="${minIdle}"/>

       <propertyname="maxWait"value="${maxWait}"/>

       <propertyname="validationQuery"value="${validationQuery}"/>

       <propertyname="testWhileIdle"value="${testWhileIdle}"/>

       <propertyname="testOnBorrow"value="${testOnBorrow}"/>

       <propertyname="testOnReturn"value="${testOnReturn}"/>

       <propertyname="maxPoolPreparedStatementPerConnectionSize"value="${maxPoolPreparedStatementPerConnectionSize}"/>

       <propertyname="removeAbandoned"value="${removeAbandoned}"/>

       <propertyname="removeAbandonedTimeout"value="${removeAbandonedTimeout}"/>

       <propertyname="timeBetweenEvictionRunsMillis"value="${timeBetweenEvictionRunsMillis}"/>

       <propertyname="minEvictableIdleTimeMillis"value="${minEvictableIdleTimeMillis}"/>

    </bean>

    <!-- 配置sessionFactory，即在这里整合mybatis-->

    <beanid="sessionFactory"class="org.mybatis.spring.SqlSessionFactoryBean">

       <propertyname="dataSource"ref="druidDataSource"></property>

       <propertyname="configLocation">

           <value>classpath:configs/mybatis-config.xml</value>

       </property>

       <propertyname="mapperLocations">

           <list>

              <value>classpath:com/wx/entitys/*.xml</value>

           </list>

       </property>

    </bean>

    <!-- 提供执行增删改查的 sqlSessionTemplate对象，用于注入到dao层-->

    <beanid="sqlSessionTemplate"class="org.mybatis.spring.SqlSessionTemplate">

       <constructor-argname="sqlSessionFactory"ref="sessionFactory"></constructor-arg>

    </bean>

   

    <!-- 统一事务处理的配置start -->

    <beanid="txManager"class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

       <propertyname="dataSource"ref="druidDataSource"></property>

    </bean>

    <tx:adviceid="txAdvise"transaction-manager="txManager">

       <tx:attributes>

           <tx:methodname="find*"read-only="true"/>

           <tx:methodname="search*"read-only="true"/>

           <tx:methodname="query*"read-only="true"/>

           <tx:methodname="get*"read-only="true"/>

           <tx:methodname="add*"propagation="REQUIRED"/>

           <tx:methodname="save*"propagation="REQUIRED"/>

           <tx:methodname="do*"propagation="REQUIRED"/>

           <tx:methodname="update*"propagation="REQUIRED"/>

           <tx:methodname="del*"propagation="REQUIRED"/>

       </tx:attributes>

    </tx:advice>

    <aop:config>

       <aop:pointcutexpression="execution(* com.wx.service.*.*(..))"id="myCut"/>

       <aop:advisoradvice-ref="txAdvise"pointcut-ref="myCut"/>

    </aop:config>

    <!-- 统一事务处理的配置end -->

</beans>

=====================================================================

 

步骤七：编写dao层的配置文件applicationContext-dao.xml，如下所示:

===================== applicationContext-dao.xml====================

<?xmlversion="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"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

     http://www.springframework.org/schema/aop

     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

     http://www.springframework.org/schema/tx

     http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

   

    <beanid="userDao"class="com.wx.dao.user.UserDaoImpl">

       <propertyname="sqlTemplate"ref="sqlSessionTemplate"></property>

    </bean>

    <beanid="acctDao"class="com.wx.dao.account.AcountDaoImpl">

       <propertyname="sqlTemplate"ref="sqlSessionTemplate"></property>

    </bean>

    <beanid="studentDao"class="com.wx.dao.school.StudentDaoImpl">

       <propertyname="sqlTemplate"ref="sqlSessionTemplate"></property>

    </bean>

    <beanid="deptDao"class="com.wx.dao.school.DepartmentDaoImpl">

       <propertyname="sqlTemplate"ref="sqlSessionTemplate"></property>

    </bean>

</beans>

=====================================================================

 

步骤八：编写service层的配置文件applicationContext-service.xml，如下所示:

====================applicationContext-service.xml==================

<?xmlversion="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"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

     http://www.springframework.org/schema/aop

     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

     http://www.springframework.org/schema/tx

     http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

   

    <beanid="userService"class="com.wx.service.UserService">

       <propertyname="userDao"ref="userDao"></property>

    </bean>

    <beanid="schoolService"class="com.wx.service.SchoolService">

       <propertyname="deptDao"ref="deptDao"></property>

       <propertyname="studentDao"ref="studentDao"></property>

    </bean>

    <beanid="acctService"class="com.wx.service.AccountService">

       <propertyname="acctDao"ref="acctDao"></property>

    </bean>

</beans>

=====================================================================

步骤九：编写spring mvc的核心配置文件springmvc-dispatcher.xml，如下所示:

==================== springmvc-dispatcher.xml==================

<?xmlversion="1.0"encoding="UTF-8"?>

<!DOCTYPEbeans PUBLIC "-//SPRING//DTDBEAN//EN"

 "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>   

    <!-- 导入控制器的bean配置 -->

    <importresource="classpath:configs/mvc/springmvc-controler.xml"/>

    <!-- 视图解析器 -->

    <beanid="resourceView"

       class="org.springframework.web.servlet.view.InternalResourceViewResolver">

       <propertyname="prefix"value="/"></property>

       <propertyname="suffix"value=".jsp"></property>

    </bean>

    <!-- 映射处理器 -->

    <beanid="simpleUrlMapping"

         class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">

         <propertyname="mappings">

            <props>

                <propkey="/Login.php">userControl</prop>

                <propkey="/Quit.php">userControl</prop>

                <propkey="/Trans.php">acctControl</prop>

                <propkey="/GetAllDept.php">deptControl</prop>

                <propkey="/QueryStu.php">studentControl</prop>

                <propkey="/Register.php">userControl</prop>

                <propkey="/ShowOneUser.php">userControl</prop>

                <propkey="/CheckUser.php">userControl</prop>

            </props>

         </property>

    </bean>

   

    <!-- 方法名称解析器 -->

    <beanid="springMethodNameResolver"

         class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver">

       <propertyname="mappings">

           <props>

              <propkey="/Login.php">login</prop>

              <propkey="/Quit.php">quit</prop>

              <propkey="/Trans.php">doTransfer</prop>

              <propkey="/GetAllDept.php">getAllDeptNames</prop>

              <propkey="/QueryStu.php">queryAllStu</prop>

              <propkey="/Register.php">register</prop>

              <propkey="/ShowOneUser.php">showOne</prop>

              <propkey="/CheckUser.php">isUserExist</prop>

           </props>

       </property>

    </bean>

</beans>

=====================================================================

 

步骤十：编写控制器的配置文件springmvc-controler.xml，如下所示:

==================== springmvc-controler.xml==============================

<?xmlversion="1.0"encoding="UTF-8"?>

<!DOCTYPEbeans PUBLIC "-//SPRING//DTDBEAN//EN"

 "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>   

    <beanid="userControl"class="com.wx.controler.user.UserControl">

       <propertyname="methodNameResolver"ref="springMethodNameResolver">

       </property>

       <propertyname="userServ"ref="userService"></property>

    </bean>   

    <beanid="acctControl"class="com.wx.controler.account.AccountControl">

       <propertyname="methodNameResolver"ref="springMethodNameResolver">

       </property>

       <propertyname="acctServ"ref="acctService"></property>

    </bean>

    <beanid="deptControl"class="com.wx.controler.school.DepartControl">

       <propertyname="methodNameResolver"ref="springMethodNameResolver">

       </property>

       <propertyname="schoolServ"ref="schoolService"></property>

    </bean>

    <beanid="studentControl"class="com.wx.controler.school.StudentControl">

       <propertyname="methodNameResolver"ref="springMethodNameResolver">

       </property>

       <propertyname="schoolServ"ref="schoolService"></property>

    </bean>

</beans>

=====================================================================

说明：其它的java类和jsp代码不一一列出，因为实在太多了，有需要请联系我。

 

步骤十一: 启动tomcat，发布项目，在地址栏分别输入 http://localhost:8080/SMMvc

进行测试。 登录后的结果如图所示：

 联系作者：