6.7w+
社区成员
SSH2结构下openSessionInView无效，求指教！查了一天了，谢谢大家了...
各位高手，内容很简单，请务必帮忙看看啊...
事务传播特性：
<aop:config>
<aop:pointcut id="allManagerMethod" expression="execution(* stu.service.*.*(..))"/>
<aop:advisor pointcut-ref="allManagerMethod" advice-ref="txAdvice"/>
</aop:config>
web.xml中这么配置：
<!-- Spring声明 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/classes/applicationContext-*.xml</param-value>
</context-param>
<!-- spring上下文监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- OpenSessionInView -->
<filter>
<filter-name>openSessionInViewFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>openSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- struts2.1 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<!-- ActionContextCleanUp -->
<filter>
<filter-name>ActionContextCleanUp</filter-name>
<filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
</filter>
<filter-mapping>
<filter-name>ActionContextCleanUp</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 字符编码Filter -->
<filter>
<filter-name>Spring character encoding filter</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>Spring character encoding filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
struts.xml:
<constant name="struts.objectFactory" value="spring"/>
在前台页面调用
${user.newsSorts}时报错：
10-04-08 18:01:33 ERROR LazyInitializationException:19 - failed to lazily initialize a collection of role: stu.model.User.newsSorts, no session or session was closed
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: stu.model.User.newsSorts, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:249)
at org.apache.taglibs.standard.tag.common.core.ForEachSupport.toForEachIterator(ForEachSupport.java:348)
at org.apache.taglibs.standard.tag.common.core.ForEachSupport.supportedTypeForEachIterator(ForEachSupport.java:224)
at org.apache.taglibs.standard.tag.common.core.ForEachSupport.prepare(ForEachSupport.java:155)
at javax.servlet.jsp.jstl.core.LoopTagSupport.doStartTag(LoopTagSupport.java:256)
at org.apache.jsp.login.left_jsp._jspService(left_jsp.java:221)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:102)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
2010-4-8 18:01:33 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: stu.model.User.newsSorts, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:249)
at
我测试了一下，在action中newsSort可以取出来并发送sql语句，但是到了前台貌似我配置的openSessionInView就失效了！
望高手们不吝指教！
Q : 83534146
事务传播特性：
<aop:config>
<aop:pointcut id="allManagerMethod" expression="execution(* stu.service.*.*(..))"/>
<aop:advisor pointcut-ref="allManagerMethod" advice-ref="txAdvice"/>
</aop:config>
web.xml中这么配置：
<!-- Spring声明 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/classes/applicationContext-*.xml</param-value>
</context-param>
<!-- spring上下文监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- OpenSessionInView -->
<filter>
<filter-name>openSessionInViewFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>openSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- struts2.1 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<!-- ActionContextCleanUp -->
<filter>
<filter-name>ActionContextCleanUp</filter-name>
<filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
</filter>
<filter-mapping>
<filter-name>ActionContextCleanUp</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 字符编码Filter -->
<filter>
<filter-name>Spring character encoding filter</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>Spring character encoding filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
struts.xml:
<constant name="struts.objectFactory" value="spring"/>
在前台页面调用
${user.newsSorts}时报错：
10-04-08 18:01:33 ERROR LazyInitializationException:19 - failed to lazily initialize a collection of role: stu.model.User.newsSorts, no session or session was closed
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: stu.model.User.newsSorts, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:249)
at org.apache.taglibs.standard.tag.common.core.ForEachSupport.toForEachIterator(ForEachSupport.java:348)
at org.apache.taglibs.standard.tag.common.core.ForEachSupport.supportedTypeForEachIterator(ForEachSupport.java:224)
at org.apache.taglibs.standard.tag.common.core.ForEachSupport.prepare(ForEachSupport.java:155)
at javax.servlet.jsp.jstl.core.LoopTagSupport.doStartTag(LoopTagSupport.java:256)
at org.apache.jsp.login.left_jsp._jspService(left_jsp.java:221)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:102)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
2010-4-8 18:01:33 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: stu.model.User.newsSorts, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:249)
at
我测试了一下，在action中newsSort可以取出来并发送sql语句，但是到了前台貌似我配置的openSessionInView就失效了！
望高手们不吝指教！
Q : 83534146
...全文
当前发帖距今超过3年，不再开放新的回复
发表回复
kongxue1220 2011-05-13
请问结果解决了嘛？我也用的注解配置的关系，也报错，求救！
leishf 2010-04-12
我也遇到了同样的问题。郁闷啊
wg243964183 2010-04-12
这个异常信息是延迟初始化异常。简单来说呢你用的那个对象应该用Hibernate.initialize(Object)这个方法来显示的初始化一下你用到的对象OK。用到那个Object就添那个。
perior 2010-04-11
[Quote=引用 9 楼 royaki 的回复:]
我使用的注解
@OneToMany(mappedBy="user",fetch=FetchType.LAZY)
private List<NewsSort> newsSorts;
[/Quote]
这个引用是干什么的？
我使用的注解
@OneToMany(mappedBy="user",fetch=FetchType.LAZY)
private List<NewsSort> newsSorts;
[/Quote]
这个引用是干什么的？
存在666 2010-04-10
lazy设置为false就可以了!
royaki 2010-04-09
[Quote=引用 8 楼 yxfei666 的回复:]
试试把 hibernate 映射文件中的 lazy设置为true
[/Quote]
我使用的注解
@OneToMany(mappedBy="user",fetch=FetchType.LAZY)
private List<NewsSort> newsSorts;
试试把 hibernate 映射文件中的 lazy设置为true
[/Quote]
我使用的注解
@OneToMany(mappedBy="user",fetch=FetchType.LAZY)
private List<NewsSort> newsSorts;
perior 2010-04-09
试试把 hibernate 映射文件中的 lazy设置为true
dongguang1082 2010-04-09
UP,shit,,,鼎
royaki 2010-04-09
后台没有显示的关闭session
//查找用户
public User findUser(String username,String password) throws Exception
{
String hql="from User user where user.username=? and user.password=?";
return (User)this.getHibernateTemplate().find(hql,new Object[]{username,password}).get(0);
}
这样进行的操作。
非常简单的操作
//查找用户
public User findUser(String username,String password) throws Exception
{
String hql="from User user where user.username=? and user.password=?";
return (User)this.getHibernateTemplate().find(hql,new Object[]{username,password}).get(0);
}
这样进行的操作。
非常简单的操作
chcbz 2010-04-09
我觉得楼上的说法比较合理,不过我不建议用openSessionInView,因为用openSessionInView会令事务很难管理.
zidasine 2010-04-09
基本为 过滤器顺序问题 我blog有OpenSessionInViewFilter失效的文章
<!-- struts2.1 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<!-- ActionContextCleanUp -->
<filter>
<filter-name>ActionContextCleanUp</filter-name>
<filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
</filter>
<filter-mapping>
<filter-name>ActionContextCleanUp</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
将这2个换下位置
<!-- struts2.1 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<!-- ActionContextCleanUp -->
<filter>
<filter-name>ActionContextCleanUp</filter-name>
<filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
</filter>
<filter-mapping>
<filter-name>ActionContextCleanUp</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
将这2个换下位置
wzy728 2010-04-09
既然是SSH 应该就可以用org.springframework.orm.hibernate3.support.OpenSessionInViewFilter过滤器了吧 这样的效率高些
我就是看这个http://blog.csdn.net/Siobhan/archive/2009/08/04/4407686.aspx 解决的问题
我就是看这个http://blog.csdn.net/Siobhan/archive/2009/08/04/4407686.aspx 解决的问题
markey_gu 2010-04-08
ActionContextCleanUp 放到 struts2 上面
perior 2010-04-08
failed to lazily initialize a collection of role: stu.model.User.newsSorts, no session or session was closed
hibernate 使用不恰当，hibernate部分代码看看，否则无法查出原因
hibernate 使用不恰当，hibernate部分代码看看，否则无法查出原因
BigBird2012 2010-04-08
[Quote=引用 2 楼 dickli1986 的回复:]
你的Hibernate使用的延迟加载，当加载类的时候，session已经关闭了，所以无法加载那个类，在加载之前不要关闭session
[/Quote]
估计你在程序中用“session.close()”方法显式的关闭了session，一般来说，session在Spring管理的情况下，不必显式调用session的close()方法关闭session
好好检查一下你的程序代码
你的Hibernate使用的延迟加载，当加载类的时候，session已经关闭了，所以无法加载那个类，在加载之前不要关闭session
[/Quote]
估计你在程序中用“session.close()”方法显式的关闭了session，一般来说，session在Spring管理的情况下，不必显式调用session的close()方法关闭session
好好检查一下你的程序代码
dickli1986 2010-04-08
你的Hibernate使用的延迟加载，当加载类的时候，session已经关闭了，所以无法加载那个类，在加载之前不要关闭session
archko 2010-04-08
这一堆都没看出来有什么用,你不把相关的代码弄出来如何.
SSH整合示例项目 hibernate5.2.3+struts2.5.2+spring4.3.3.zip 最新版SSH项目整合 实现了OpenSessionInView。 hibernate5.2.3+struts2.5.2+spring4.3.3
SSH项目web.xml配置 2、 启动Web容器时，自动装配ApplicationContext.xml的配置信息： <listener-class>org.springframework.web.context.ContextLoaderListener 3、整合Struts2 <filter-name>struts2 org.apache....
Spring3.x_Struts2.x_Hibernate3.x整合之OpenSessionInView的实现 -- 如果把这个filter放在struts2的filter之后，所有的请求都会被struts2给控制，所以这个filter就不起作用了， 必须将这个filter放在struts2的filter之前--> <filter-name>OpenSessionInViewFilter ...
SSH OpenSessionInView 在使用ssh开发的项目中，hibernate的懒加载一直是让...接下来我将以一个简单的例子实现SSH的整合及OpenSessionInView。 第一步：准备数据（数据库表） 我是用的是mysql数据库，其中创建两张表。person和sex。建表语句
SSH第一篇【整合SSH步骤、OpenSessionInView】 到目前为止，Struts2、Hibernate、Spring框架都过了一遍了。也写过了Spring怎么与Struts2整合，Spring与Hibernate整合…本博文主要讲解SSH的整合 整合步骤： 1） 引入SSH Jar文件 Struts 核心jar Hibernate 核心...
hibernate的OpenSessionInView--MVC模式下hibernate关联查询还未使用数据session就关闭了导致关联查询报错的问题... 的一个支持类，其主要意思是在发起一个页面请求时打开 Hibernate 的 Session ，一直保持这个 Session ，直到这个请求结束。 它有两种使用方式：分别是 OpenSessionInViewInterceptor 和 ...
ssh与ajax结合之json异常：org.apache.struts2.json.JSONException 在ssh和ajax结合实现异步传输时，经常会出现的一个问题是，json格式的数据从后台传递到页面后无法解析，下面的data即是回调函数中参数，在页面断点后会看到data接收到的是下面一堆数据，其实是异常信息。-----------...
java SSH第一章学习内容（Hibernate多表查询，延迟加载，OpenSessionInView） 一.一对多，多对一查询例：县区表和街道表的查询District(县区) 表：Street（街道）表：1.利用自动生成的DAO里面进行修改2.获得session 3.使用session.get方法获取类反射 4.对数据进行增删改查操作1.查询黄埔大道...
SSH项目整合示例【OpenSessionInView】所用到的jar包 SSH项目整合示例【OpenSessionInView】所用到的jar包 包含Struts + Hibernate + Spring所有jar及其依赖的jar
spring_SSH整合之_OpenSessionInView HibernateTemplate中的load和get都可以取回一个对象，难道是方法重复吗？绝对不可能，那它们到底有那些区别呢？ 一、load有加载延时，需要设置lazy属性，我没有配置lazy的时候，报错，加上了lazy="false"属性时，...
SSH2（后台管理页面+Vue+Element-UI+动态树+分页+正则表达） 后台搭建-前端展示1：加入maven項目1.1创建如图中的工作流程包+配置文件1.2导入Spring容器框架（业务逻辑处理）2.Base(接口工具类):3.SYS模块包：**Util工具类源码****Model实体类****Mapping包**Dao层ServiceBas項...
ssh web.xml ssh web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="...
SSH框架中的使用OpenSessionInView的问题 观点一： 今天有一个朋友问了我一个问题，他使用的是Hibernate/Spring/Struts架构，配置使用Spring的 OpenSessionInView Filter，但是发现不生效，lazy的集合属性在页面访问的时候仍然报session已经关闭的错误。...
Spring3.x_Struts2.x_Hibernate3.x整合之声明式事务配置 如：删除，更新等，此时如果在执行了一个步骤之后抛出抛出异常就会导致数据部完整，所以事务不应该在Dao中处理，而应该在Service中处理， 这也是就是Spring提供的一个非常方便的工具，声明式的事务
