spring mvc+mybatis+ spring 基于全注解事务配置
虾米哥
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2021-03-31 22:10:40
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spring mvc 自动扫描注解时,不需要扫描@Service
<!-- 扫描所有的controller 但是不扫描service-->
<context:component-scan base-package="com.wlsq">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
</context:component-scan>
spring 自动扫描时,不需要扫描@Controller,并开启事务注解机制
<!-- 开启事务注解驱动 -->
<tx:annotation-driven />
<context:component-scan base-package="com.wlsq">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>
重点:
Spring MVC启动时的配置文件,包含组件扫描、url映射以及设置freemarker参数,让spring不扫描带有@Service注解的类。为什么要这样设置?因为servlet-context.xml与service-context.xml不是同时加载,如果不进行这样的设置,那么,spring就会将所有带@Service注解的类都扫描到容器中,等到加载service-context.xml的时候,会因为容器已经存在Service类,使得cglib将不对Service进行代理,直接导致的结果就是在service-context中的事务配置不起作用,发生异常时,无法对数据进行回滚。
项目配置源文件
spring-mvc.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:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
<!-- 自动扫描该包,使SpringMVC认为包下用了@controller注解的类是控制器 -->
<mvc:annotation-driven />
<mvc:default-servlet-handler />
<context:annotation-config />
<!-- 扫描所有的controller 但是不扫描service-->
<context:component-scan base-package="com.wlsq">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
</context:component-scan>
<!-- 声明DispatcherServlet不要拦截下面声明的目录 -->
<mvc:resources location="/js/" mapping="/js/**" />
<mvc:resources location="/images/" mapping="/images/**" />
<mvc:resources location="/css/" mapping="/css/**" />
<mvc:resources location="/common/" mapping="/common/**" />
<!--避免IE执行AJAX时,返回JSON出现下载文件 -->
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
</bean>
<!--Spring mvc 返回json -->
<bean id="stringConverter"
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
<!-- 启动SpringMVC的注解功能,完成请求和注解POJO的映射 -->
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJacksonHttpMessageConverter" /> <!-- JSON转换器 -->
<ref bean="stringConverter" />
</list>
</property>
</bean>
<!-- 定义跳转的文件的前后缀 ,视图模式配置 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀,变成一个 可用的url地址 -->
<property name="prefix" value="/backstage/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 配置文件上传,如果没有使用文件上传可以不用配置,当然如果不配,那么配置文件中也不必引入上传组件包 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 默认编码 -->
<property name="defaultEncoding" value="utf-8" />
<!-- 文件大小最大值 -->
<property name="maxUploadSize" value="10485760000" />
<!-- 内存中的最大值 -->
<property name="maxInMemorySize" value="40960" />
</bean>
</beans>
<?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:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- 开启事务注解驱动 -->
<tx:annotation-driven />
<context:component-scan base-package="com.wlsq">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<!-- 引入配置文件 -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties" />
</bean>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<!-- 基本属性 url、user、password -->
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
<!-- 配置初始化大小、最小、最大 -->
<property name="initialSize" value="1" />
<property name="minIdle" value="1" />
<property name="maxActive" value="20" />
<!-- 配置获取连接等待超时的时间 -->
<property name="maxWait" value="60000" />
<!-- 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 -->
<property name="timeBetweenEvictionRunsMillis" value="60000" />
<!-- 配置一个连接在池中最小生存的时间,单位是毫秒 -->
<property name="minEvictableIdleTimeMillis" value="300000" />
<property name="validationQuery" value="SELECT 'x'" />
<property name="testWhileIdle" value="true" />
<property name="testOnBorrow" value="false" />
<property name="testOnReturn" value="false" />
<!-- 打开PSCache,并且指定每个连接上PSCache的大小 -->
<property name="poolPreparedStatements" value="true" />
<property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
<!-- 配置监控统计拦截的filters -->
<property name="filters" value="stat" />
</bean>
<!-- spring和MyBatis完美整合,不需要mybatis的配置映射文件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 自动扫描mapping.xml文件 -->
<property name="mapperLocations" value="classpath:com/wlsq/mapper/*.xml"></property>
</bean>
<!-- DAO接口所在包名,Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.wlsq.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
<!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
我的事务管理主要集中在:service 层进行控制
@Transactional(readOnly = false,propagation=Propagation.REQUIRED)
@Override
public int insert(User record) {
// TODO Auto-generated method stub
int j=this.userMapper.insert(record);
int i = 1/0;;
return j;
}
<span style="white-space:pre"> </span> <tx:method name="delete*" propagation="REQUIRED" />
<tx:method name="insert*" propagation="REQUIRED" />
<tx:method name="update*" propagation="REQUIRED" />
<tx:method name="find*" read-only="true" />
<tx:method name="get*" read-only="true" />
<tx:method name="select*" read-only="true" />
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