首先maven中加入spring依赖:
<properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.spring.groupId>org.springframework</project.spring.groupId> <project.spring.version>3.0.5.RELEASE</project.spring.version> </properties> <repositories> <repository> <id>mvn-repo</id> <url>http://maven.ansj.org/</url> </repository> </repositories> <dependencies> <!--spring begin --> <dependency> <groupId>${project.spring.groupId}</groupId> <artifactId>spring-context</artifactId> <version>${project.spring.version}</version> </dependency> <dependency> <groupId>${project.spring.groupId}</groupId> <artifactId>spring-core</artifactId> <version>${project.spring.version}</version> </dependency> <dependency> <groupId>${project.spring.groupId}</groupId> <artifactId>spring-beans</artifactId> <version>${project.spring.version}</version> </dependency> <dependency> <groupId>${project.spring.groupId}</groupId> <artifactId>spring-web</artifactId> <version>${project.spring.version}</version> </dependency> <dependency> <groupId>${project.spring.groupId}</groupId> <artifactId>spring-webmvc</artifactId> <version>${project.spring.version}</version> </dependency> <dependency> <groupId>${project.spring.groupId}</groupId> <artifactId>spring-jdbc</artifactId> <version>${project.spring.version}</version> </dependency> <dependency> <groupId>${project.spring.groupId}</groupId> <artifactId>spring-orm</artifactId> <version>${project.spring.version}</version> </dependency> <dependency> <groupId>${project.spring.groupId}</groupId> <artifactId>spring-context-support</artifactId> <version>${project.spring.version}</version> </dependency> <dependency> <groupId>${project.spring.groupId}</groupId> <artifactId>spring-tx</artifactId> <version>${project.spring.version}</version> </dependency> <!--spring end --> <dependency> <groupId>org.quartz-scheduler</groupId> <artifactId>quartz</artifactId> <version>1.8.3</version> </dependency> <dependency> <!-- jsoup HTML parser library @ http://jsoup.org/ --> <groupId>org.jsoup</groupId> <artifactId>jsoup</artifactId> <version>1.8.2</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.16</version> </dependency> <!-- commons --> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.0.1</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>commons-pool</groupId> <artifactId>commons-pool</artifactId> <version>1.5.6</version> </dependency> <dependency> <groupId>commons-collections</groupId> <artifactId>commons-collections</artifactId> <version>3.2.1</version> </dependency> <dependency> <groupId>commons-net</groupId> <artifactId>commons-net</artifactId> <version>3.1</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.5</version> </dependency> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> </dependency> <!-- httpclient --> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpmime</artifactId> <version>4.2.1</version> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpcomponents-core</artifactId> <version>4.2.1</version> <type>pom</type> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient-cache</artifactId> <version>4.2.1</version> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.2.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.18</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> <scope>runtime</scope> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <dependency> <groupId>net.sf.json-lib</groupId> <artifactId>json-lib</artifactId> <version>2.4</version> <classifier>jdk15</classifier> </dependency> <dependency> <groupId>net.sourceforge.jexcelapi</groupId> <artifactId>jxl</artifactId> <version>2.6.12</version> </dependency> <dependency> <groupId>org.ansj</groupId> <artifactId>ansj_seg</artifactId> <!-- <classifier>min</classifier> 如果是需要nlp方式分词,就去掉这个标签 --> <version>0.9</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> </dependencies>
然后是web.xml:
<listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath*:context/spring/applicationContext*.xml </param-value> </context-param> <servlet> <servlet-name>bda</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <!-- 指定springmvc配置文件 --> <param-value>classpath:context/spring/spring-mvc.xml</param-value> </init-param> <load-on-startup>3</load-on-startup> </servlet> <servlet-mapping> <servlet-name>bda</servlet-name> <url-pattern>*.htm</url-pattern> </servlet-mapping> <filter> <filter-name>CharacterEncodingFilter</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> </filter> <filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>*</url-pattern> </filter-mapping>
然后是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:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 注解驱动打开 --> <context:annotation-config /> <context:property-placeholder location="classpath:properties/*.properties" /> <context:component-scan base-package="com.howbuy.baiduapi.*"> <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <!--这里注意包的扫描路径可以包含controller的,也可以不包含,如果包含,则会被springmvc的加载配置覆盖--> </beans>
然后是applicationContext-db.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: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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> <bean id="dbSeo" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${jdbc.driver}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dbSeo" /> <property name="configLocation" value="classpath:/context/mybatis/mybatis-config.xml" /> <property name="mapperLocations" value="classpath*:/context/mybatis/mapper/*sqlmap.xml" /> </bean> <bean id="seoTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dbSeo" /> </bean> <bean id="seoSqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0" ref="sqlSessionFactory" /> <!-- <constructor-arg index="1" value="BATCH" /> --> </bean> <!-- 注解驱动,使用定义的事务管理器 ,是使用@Transactional前提条件--> <tx:annotation-driven transaction-manager="seoTransactionManager"/> </beans>
然后是springmvc的配置文件
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 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/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> <!-- 打开springmvc驱动 --> <mvc:annotation-driven /> <!-- 自动扫描 ,注意!!!这里说明一下,扫描包的路径一定是指定到控制器层,否则会出现把其他bean的注解覆盖,导致其他bean不能生效,比如@Transactional ,这里表示和springcontext文件分开加载--> <context:component-scan base-package="com.howbuy.baiduapi.controller" /> <!-- 定义JSP文件的位置 --> <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> <!--<property name="order" value="2" /> --> </bean> </beans>
附件是测试项目,
如下文章来自网络:
@Transactional 事务回滚 分析
@Transactional 事务回滚
Spring的AOP事务管理默认是针对unchecked exception回滚(运行期异常,Runtime Exception)。
unchecked ,就是不用手工写try catch的exception
Exception作为基类,下面还分checked exception和unchecked exception。如果客户端可以通过其他的方法恢复异常,那么这种异常就是checked exception;如果客户端对出现的这种异常无能为力,那么这种异常就是Unchecked exception;简单来说,继承于RuntimeException的都是unchecked exception。
Error:
1.总是不可控制的(unchecked)
2.经常用来用于表示系统错误或低层资源的错误
3.如何可能的话,应该在系统级被捕捉
Exception:
1.可以是可被控制(checked) 或不可控制的(unchecked)
2.表示一个由程序员导致的错误
3.应该在应用程序级被处理
Java 中定义了两类异常:
1) Checked exception: 这类异常都是Exception的子类 。异常的向上抛出机制进行处理,假如子类可能产生A异常,那么在父类中也必须throws A异常。可能导致的问题:代码效率低,耦合度过高。
2) Unchecked exception: 这类异常都是RuntimeException的子类,虽然RuntimeException同样也是Exception的子类,但是它们是非凡的,它们 不能通过client code来试图解决,所以称为Unchecked exception 。
在一个类的最外面加@Transactional
表示这个类的方法中,会开启事务
但这个事务只对unchecked( runtime exception)异常回滚
throw new RuntimeException("异常"); //这个回滚
throw new Exception("异常");//这个不回滚
对checked, Exception是不回滚的
如果要对checked异常进行回滚,则必须在此方法上加:
@Transactional(rollbackFor=Exception.class)
在mng(service)中,如果只是get值,那么可以在此方法上加:
@Transactional(propagation=Propagation.NOT_SUPPORTED)
事务默认为:
@Transactional(propagation=Propagation.REQUIRED)
REQUIRED:业务方法需要在一个事务中运行。如果方法运行时,已经处在一个事务中,那么加入到该事务,否则为自己创建一个新的事务。
NOT_SUPPORTED:声明方法不需要事务。如果方法没有关联到一个事务,容器不会为它开启事务。如果方法在一个事务中被调用,该事务会被挂起,在方法调用结束后,原先的事务便会恢复执行。
REQUIRESNEW:属性表明不管是否存在事务,业务方法总会为自己发起一个新的事务。如果方法已经运行在一个事务中,则原有事务会被挂起,新的事务会被创建,直到方法执行结束,新事务才算结束,原先的事务才会恢复执行。
MANDATORY:该属性指定业务方法只能在一个已经存在的事务中执行,业务方法不能发起自己的事务。如果业务方法在没有事务的环境下调用,容器就会抛出例外。
SUPPORTS:这一事务属性表明,如果业务方法在某个事务范围内被调用,则方法成为该事务的一部分。如果业务方法在事务范围外被调用,则方法在没有事务的环境下执行。
Never:指定业务方法绝对不能在事务范围内执行。如果业务方法在某个事务中执行,容器会抛出例外,只有业务方法没有关联到任何事务,才能正常执行。
NESTED:如果一个活动的事务存在,则运行在一个嵌套的事务中. 如果没有活动事务, 则按REQUIRED属性执行.它使用了一个单独的事务, 这个事务拥有多个可以回滚的保存点。内部事务的回滚不会对外部事务造成影响。它只对DataSourceTransactionManager事务管理器起效