关于用spring的JtaTransactionManager，配置分布式事务

如果容器支持jta，那么spring配置起来非常简单，因为spring提供了JtaTransactionManager，在这里面提供了几乎所有的服务器的jta的jndi名字，比如

*   " java:comp/UserTransaction "   for  Resin  2 . x ,  Oracle OC4J (Orion) ,  JOnAS (JOTM) ,  BEA WebLogic
*   " java:comp/TransactionManager "   for  Resin  3 . x
*   " java:appserver/TransactionManager "   for  GlassFish
*   " java:pm/TransactionManager "   for  Borland Enterprise Server and Sun Application Server (Sun ONE  7  and later)
*   " java:/TransactionManager "   for  JBoss Application Server

由于大部分服务器获取jta的方式都不尽相同，spring还针对不同的服务器提供了不同的jta实现，例如：

WebLogicJtaTransactionManager
WebSphereUowTransactionManager
OC4JJtaTransactionManager

具体内容参加：
http://static.springsource.org/spring/docs/2.5.x/api/org/springframework/transaction/jta/JtaTransactionManager.html

不管是jdbc、hibernate还是ibatis，都可以通过JtaTransactionManager来配置分布式事务
下面简单贴出部分配置代码：
hibernate：

< beans >
   < jee:jndi-lookup  id ="myDataSource1"  jndi-name ="dsjndi1"   />
   < jee:jndi-lookup  id ="myDataSource2"  jndi-name ="dsjndi2"   />

   < bean  id ="mySessionFactory1"
        class ="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean" >
         < property  name ="dataSource" >
             < ref  bean ="myDataSource1"   />
         </ property >
         < property  name ="hibernateProperties" >
             < props >
                 < prop  key ="hibernate.dialect" > org.hibernate.dialect.MySQLDialect </ prop >
                 < prop  key ="hibernate.show_sql" > true </ prop >
                 < prop  key ="hiberante.format_sql" > true </ prop >
             </ props >
         </ property >  
         < property  name ="annotatedClasses" >
             < list >
                 < value > com.landor.test.entity.User </ value >
             </ list >
         </ property >
         < property  name ="annotatedPackages" >
             < list >
                 < value > com.landor.test.entity </ value >
             </ list >
         </ property >
   </ bean >
   < bean  id ="mySessionFactory2"
        class ="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean" >
         < property  name ="dataSource" >
             < ref  bean ="myDataSource2"   />
         </ property >
        
   </ bean >

   < bean  id ="myTxManager"  class ="org.springframework.transaction.jta.JtaTransactionManager" />
  <!--如果默认id= transactionManager，那么可以有下面的标签，这样spring会自动寻找相应的jta的jndi并且注入
  <tx:jta-transaction-manager/> -->
   < tx:advice  id ="txAdvice"  transaction-manager ="myTxManager" >
     < tx:attributes >
         < tx:method  name ="select*"  read-only ="true"  propagation ="REQUIRED" />
         < tx:method  name ="find*"  read-only ="true"   propagation ="REQUIRED" />
         < tx:method  name ="save*"   propagation ="REQUIRED"  isolation ="REPEATABLE_READ" />
         < tx:method  name ="update*"   propagation ="REQUIRED"  isolation ="REPEATABLE_READ" />
         < tx:method  name ="add*"   propagation ="REQUIRED"  isolation ="REPEATABLE_READ"   />
         < tx:method  name ="delete*"   propagation ="REQUIRED"  isolation ="REPEATABLE_READ" />
     </ tx:attributes >
   </ tx:advice >

</ beans >

ibatis：
ibatis与hibernate是一样的，只需要将hibernate的sessionFactory部分更换一下

    ......
    < bean  id ="sqlMap1Client"
        class ="org.springframework.orm.ibatis.SqlMapClientFactoryBean" >
         < property  name ="dataSource"  ref ="myDataSource1"   />
         < property  name ="configLocation"  value ="xxx/SqlMapConfig.xml"   />
     </ bean >
     < bean  id ="sqlMap2Client"
        class ="org.springframework.orm.ibatis.SqlMapClientFactoryBean" >
         < property  name ="dataSource"  ref ="OssDS"   />
         < property  name ="configLocation"  value ="xxx/SqlMapConfig.xml"   />
     </ bean >
    ......