Spring mvc整合Mybatis例子

整合的框架理解

Spring mvc框架是前面展示使用JSP进行页面展示，使用ServletDispatcher或者ContextLoadListener作为bean的容器，其中包括拦截器和视图解析。业务层使用Controller进行业务包装，底层使用Service实现具体的数据交互。

Mybatis是针对sqlmap使用的语句作为实现返回到service中的方法。

环境：

Spring版本:3.2.1

Mybatis版本:3.3.0

JDK版本:1.6

IDE:eclipse

以下为具体的步骤

1.新建web项目Spring_Mybatis_Demo2，并引入相应的jar包。所需jar包如下图所示。



2.编辑web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
4000
;
<display-name>Spring_Myibatis_Demo</display-name>

<!-- 配置Dispatcher Servlet.这里所有的bean都放到了Dispatcher Servlet中，也是一种简单的方法-->
<servlet>
<servlet-name>SpringDispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:/applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>SpringDispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<!-- 配置Spring ContextLoaderListener -->
<!--
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:/applicationContext*.xml
</param-value>
</context-param> -->

<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

3.配置applicationContext.xml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:context="http://www.springframework.org/schema/context"
xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"
xmlns:mongo="http://www.springframework.org/schema/data/mongo"
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/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd http://www.directwebremoting.org/schema/spring-dwr http://www.directwebremoting.org/schema/spring-dwr-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd"> 
<!-- context properties路径配置.引入属性引用文件 -->
<context:property-placeholder location="classpath:jdbc.properties" />

<!-- component scan -->
<context:component-scan base-package="." />

<!-- Declare a datasource that has pooling capabilities -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass">
<value>${app.jdbc.driverClassName}</value>
</property>
<property name="jdbcUrl">
<value>${app.jdbc.url}</value>
</property>
<property name="user">
<value>${app.jdbc.username}</value>
</property>
<property name="password">
<value>${app.jdbc.password}</value>
</property>
<property name="acquireIncrement">
<value>10</value>
</property>
<property name="idleConnectionTestPeriod">
<value>60</value>
</property>
<property name="maxPoolSize">
<value>100</value>
</property>
<property name="maxStatements">
<value>50</value>
</property>
<property name="minPoolSize">
<value>10</value>
</property>
</bean>

<!-- Declare a transaction manager -->
<bean id="transactionManger" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource">
<ref bean="dataSource" />
</property>
</bean>

<!-- Enable annotation style of managing transactions -->
<tx:annotation-driven transaction-manager="transactionManger" />

<!-- define the SqlSessionFactory, notice that configLocation is not need when you user Mapper FactoryBean -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="configLocation">
<value>classpath:/sqlmap-config.xml</value>
</property>
</bean>

<!-- 视图解析 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>

<!-- scan for mappers and let them be autowired -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage">
<value>com.raistudies.persistence</value>
</property>
</bean>
</beans>

4.配置引用的jdbc.properties文件

#database properties
app.jdbc.driverClassName=com.mysql.jdbc.Driver
app.jdbc.url=jdbc:mysql://localhost/test
app.jdbc.username=root
app.jdbc.password=root@123

5.配置sqlSessionFactory引用的sqlmap-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/my
cd22
batis-3-config.dtd">
<configuration>
<settings>
<!-- changes from the defaults -->
<setting name="lazyLoadingEnabled" value="false" />
</settings>
<typeAliases>
<typeAlias type="com.raistudies.domain.User" alias="user"/>
</typeAliases>
</configuration>

6.到这里所有的配置文件已经完成，可以进行接下来的开发。具体的项目文件如下图所示:



其中:

* com.raistudies.controller为controller包，下面存放controller。

* com.raistudies.domain为实体对象包，下面存放实体。

* com.raistudies.persistence为持久层包，下面存放具体的实现接口与Mapping的xml文件。

7.到此项目已经配置结束，可以进行测试。具体的文件可以从我的资源中下载。

涉及总结的错误:

1.org.apache.commons.logging.LogFactory

原因:commons-logging.jar

2.Attribute ‘destory-method’ is not allowed to appear in element ‘bean’.

这是因为destory-method写错了，应该是destroy-method,可以按alt+/提示出来。

3.Spring “The prefix ”tx“ for element ”tx:annotation-driven“ is not bound.”

Just like your other xmlns: definations, you need one for xmlns:tx

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

4.org/springframework/aop/config/AopNamespaceUtils

原因是缺少aop-release.jar

5.MapperScannerConfigurer MapperScannerConfigurer使用properties的方法报错。

原先代码如下:

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage">
<value>${MapperP}</value>
</property>
</bean>

总是在启动的时候就会报错:

Perhaps the problem may be in MapperScannerConfigurer. It is a BeanDefinitionRegistryPostProcessor and as Javadoc says:

Extension to the standard BeanFactoryPostProcessor SPI, allowing for the registration of further bean definitions before regular BeanFactoryPostProcessor detection kicks in.

所以修改代码直接写死，不适用属性引用的办法即可。

6.java.lang.NoClassDefFoundError: com/mchange/v2/ser/Indirector

已经添加了c3p0的jar包，但是还是需要添加另一个。

这里是缺少mchange-commons-java-x.x.x.jar

7.The markup in the document preceding the root element must be well-formed.

这是因为多空格或者标签不对的原因，仔细检查下就好了

8.访问页面的MAPPER的时候，比如/hello提示resource is not avaliable.

这个错误在此是因为ServletDispatcher设置的url-pattern是*.jsp,改为/就ok了。

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

9.The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files

这是因为缺少jstl.jar和standar.jar