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

2017-08-13 01:05 423 查看

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

<?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"> 
<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>



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

<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>



<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>



<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>



<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>



<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>



<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>


<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============================
<?xml
version="1.0"encoding="UTF-8"
?>
<!DOCTYPE
configuration
PUBLIC
"-//mybatis.org//DTDConfig 3.0//EN"
"mybatis-3-config.dtd">
<configuration>

<typeAliases>
<typeAlias
type="com.wx.entitys.UserEntity"
alias="userEntity"/>
<typeAlias
type="com.wx.entitys.PageEntity"
alias="conEntity"/>
<typeAlias
type="com.wx.entitys.StudentEntity"
alias="stuEntity"/>
<typeAlias
type="com.wx.entitys.DeptEntity"
alias="deptEntity"/>
<typeAlias
type="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=====================
<?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"
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"> 
<import
resource="classpath:configs/spring/applicationContext-*.xml"/>


<bean
id="config"class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
<property
name="location">
<value>classpath:configs/druidConfig.properties</value>
</property>
</bean>

<bean
id="druidDataSource"
class="com.alibaba.druid.pool.DruidDataSource"init-method="init"
destroy-method="close">
<property
name="driverClassName"value="${driverClassName}"
/>
<property
name="url"value="${url}"
/>
<property
name="username"value="${username}"
/>
<property
name="password"value="${password}"
/>
<property
name="filters"value="${filters}"
/>
<property
name="initialSize"value="${initialSize}"
/>
<property
name="maxActive"value="${maxActive}"
/>
<property
name="minIdle"value="${minIdle}"
/>
<property
name="maxWait"value="${maxWait}"
/>
<property
name="validationQuery"value="${validationQuery}"
/>
<property
name="testWhileIdle"value="${testWhileIdle}"
/>
<property
name="testOnBorrow"value="${testOnBorrow}"
/>
<property
name="testOnReturn"value="${testOnReturn}"
/>
<property
name="maxPoolPreparedStatementPerConnectionSize"value="${maxPoolPreparedStatementPerConnectionSize}"/>
<property
name="removeAbandoned"value="${removeAbandoned}"
/>
<property
name="removeAbandonedTimeout"value="${removeAbandonedTimeout}"
/>
<property
name="timeBetweenEvictionRunsMillis"value="${timeBetweenEvictionRunsMillis}"
/>
<property
name="minEvictableIdleTimeMillis"value="${minEvictableIdleTimeMillis}"
/>
</bean>

<bean
id="sessionFactory"
class="org.mybatis.spring.SqlSessionFactoryBean">
<property
name="dataSource"ref="druidDataSource"></property>
<property
name="configLocation">
<value>classpath:configs/mybatis-config.xml</value>
</property>
<property
name="mapperLocations">
<list>
<value>classpath:com/wx/entitys/*.xml</value>
</list>
</property>
</bean>

<bean
id="sqlSessionTemplate"
class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg
name="sqlSessionFactory"ref="sessionFactory"></constructor-arg>
</bean>


<bean
id="txManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property
name="dataSource"ref="druidDataSource"></property>
</bean>
<tx:advice
id="txAdvise"
transaction-manager="txManager">
<tx:attributes>
<tx:method
name="find*"read-only="true"/>
<tx:method
name="search*"read-only="true"/>
<tx:method
name="query*"read-only="true"/>
<tx:method
name="get*"read-only="true"/>
<tx:method
name="add*"propagation="REQUIRED"/>
<tx:method
name="save*"propagation="REQUIRED"/>
<tx:method
name="do*"propagation="REQUIRED"/>
<tx:method
name="update*"propagation="REQUIRED"/>
<tx:method
name="del*"
propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut
expression="execution(* com.wx.service.*.*(..))"id="myCut"/>
<aop:advisor
advice-ref="txAdvise"pointcut-ref="myCut"/>
</aop:config>

</beans>
=====================================================================

步骤七：编写dao层的配置文件applicationContext-dao.xml，如下所示:
===================== applicationContext-dao.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"
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">
<bean
id="userDao"class="com.wx.dao.user.UserDaoImpl">
<property
name="sqlTemplate"ref="sqlSessionTemplate"></property>
</bean>
<bean
id="acctDao"
class="com.wx.dao.account.AcountDaoImpl">
<property
name="sqlTemplate"ref="sqlSessionTemplate"></property>
</bean>
<bean
id="studentDao"
class="com.wx.dao.school.StudentDaoImpl">
<property
name="sqlTemplate"ref="sqlSessionTemplate"></property>
</bean>
<bean
id="deptDao"
class="com.wx.dao.school.DepartmentDaoImpl">
<property
name="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==================
<?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"
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">
<bean
id="userService"class="com.wx.service.UserService">
<property
name="userDao"ref="userDao"></property>
</bean>
<bean
id="schoolService"
class="com.wx.service.SchoolService">
<property
name="deptDao"ref="deptDao"></property>
<property
name="studentDao"ref="studentDao"></property>
</bean>
<bean
id="acctService"
class="com.wx.service.AccountService">
<property
name="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==================
<?xml
version="1.0"encoding="UTF-8"
?>
<!DOCTYPE
beans PUBLIC
"-//SPRING//DTDBEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>


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

<bean
id="resourceView"

class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property
name="prefix"value="/"></property>
<property
name="suffix"value=".jsp"></property>
</bean>

<bean
id="simpleUrlMapping"

class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property
name="mappings">
<props>
<prop
key="/Login.php">userControl</prop>
<prop
key="/Quit.php">userControl</prop>
<prop
key="/Trans.php">acctControl</prop>
<prop
key="/GetAllDept.php">deptControl</prop>
<prop
key="/QueryStu.php">studentControl</prop>
<prop
key="/Register.php">userControl</prop>
<prop
key="/ShowOneUser.php">userControl</prop>
<prop
key="/CheckUser.php">userControl</prop>
</props>
</property>
</bean>


<bean
id="springMethodNameResolver"

class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver">
<property
name="mappings">
<props>
<prop
key="/Login.php">login</prop>
<prop
key="/Quit.php">quit</prop>
<prop
key="/Trans.php">doTransfer</prop>
<prop
key="/GetAllDept.php">getAllDeptNames</prop>
<prop
key="/QueryStu.php">queryAllStu</prop>
<prop
key="/Register.php">register</prop>
<prop
key="/ShowOneUser.php">showOne</prop>
<prop
key="/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==============================
<?xml
version="1.0"encoding="UTF-8"
?>
<!DOCTYPE
beans PUBLIC
"-//SPRING//DTDBEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>

<bean
id="userControl"class="com.wx.controler.user.UserControl">
<property
name="methodNameResolver"ref="springMethodNameResolver">
</property>
<property
name="userServ"ref="userService"></property>
</bean>

<bean
id="acctControl"
class="com.wx.controler.account.AccountControl">
<property
name="methodNameResolver"ref="springMethodNameResolver">
</property>
<property
name="acctServ"ref="acctService"></property>
</bean>
<bean
id="deptControl"
class="com.wx.controler.school.DepartControl">
<property
name="methodNameResolver"ref="springMethodNameResolver">
</property>
<property
name="schoolServ"ref="schoolService"></property>
</bean>
<bean
id="studentControl"
class="com.wx.controler.school.StudentControl">
<property
name="methodNameResolver"ref="springMethodNameResolver">
</property>
<property
name="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：

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