spring jta应用

关于SpringJTA的介绍非常多了,这里就不再一再阐述其优越性怎么怎么了,直接开始正题。一个大致的需求如下,用户在进行增删改操作时,会同时更新2至3个数据库的数据表,操作需要事务来包裹,以便在操作其中一个数据库的数据表失败时,可以将其他数据库已执行的动作回滚。

由于主框架是Spring,所以将研究的重点放在Spring所提供的的JTA事务上,google了很多资料,发现有几种实现的技术,如JOTM,Atomikos,以及J2EE容器所提供的JTA实现,如JBOSS也都提供了JTA的实现,不过个人喜好来讲,非常厌恶使用JNDI来访问容器组件,所以,重点放在JOTM和Atoimikos两种技术上面,JOTM网上很多资料介绍,配置也非常简单,相信大家通过google就可以快速的上手,本着研究的原则,少少了解了另一种实现技术Atomikos,发现使用方法也很简单,下面就用一个简单的例子来详细说明一下他们在Spring中的配置和使用方法。需要说明的一点是,这个例子也是当时学习两种技术,然后测试的例子,仅仅最后做了一些整理。

初步的设想:一个包括Dao/Service/Test三层的简单应用,事务配置在service层.用来同时插入两个数据库(test,test2)的数据表xa_test,表结构非常简单,包含两个字段id,name,其中test2数据库中表xa_test的name字段不允许为空。

使用的数据库为Mysql5.0,数据库连接驱动版本5.0.8,这里需要注意,过低版本的Mysql或驱动可能不支持XADatasource。

Databasetestddl

Java代码

1.CREATETABLE`xa_test`(

2.`id`int(11)NOTNULL,

3.`name`varchar(20)defaultNULL

4.)ENGINE=InnoDBDEFAULTCHARSET=latin1;

CREATETABLE`xa_test`(

`id`int(11)NOTNULL,

`name`varchar(20)defaultNULL

)ENGINE=InnoDBDEFAULTCHARSET=latin1;

Databasetest2ddl

Java代码

1.CREATETABLE`xa_test`(

2.`id`int(11)NOTNULL,

3.`name`varchar(20)NOTNULL

4.)ENGINE=InnoDBDEFAULTCHARSET=latin1;

CREATETABLE`xa_test`(

`id`int(11)NOTNULL,

`name`varchar(20)NOTNULL

)ENGINE=InnoDBDEFAULTCHARSET=latin1;

UserDao,这里使用了两个,UserDao1和UserDao2,用以操作两个不同数据库的数据表(画蛇添足了,呵呵,为了描述清晰).Dao都继承自Spring的JdbcDaoSupport,使用JdbcTemplate进行数据库读写.

UserDao1.java

Java代码

1.packagecom.xa.dao;

2.

3.importorg.springframework.jdbc.core.support.JdbcDaoSupport;

4.

5.publicclassUserDao1extendsJdbcDaoSupport{

6.publicvoidinsertData(Stringid,Stringname){

7.getJdbcTemplate().execute("insertintoxa_testvalues('"+id+"',"+name+")");

8.}

9.}

packagecom.xa.dao;

importorg.springframework.jdbc.core.support.JdbcDaoSupport;

publicclassUserDao1extendsJdbcDaoSupport{

publicvoidinsertData(Stringid,Stringname){

getJdbcTemplate().execute("insertintoxa_testvalues('"+id+"',"+name+")");

}

}

UserDao2.java

Java代码

1.packagecom.xa.dao;

2.

3.importorg.springframework.jdbc.core.support.JdbcDaoSupport;

4.

5.publicclassUserDao2extendsJdbcDaoSupport

6.{

7.publicvoidinsertData(Stringid,Stringname){

8.getJdbcTemplate().execute("insertintoxa_testvalues('"+id+"',"+name+")");

9.}

10.}

packagecom.xa.dao;

importorg.springframework.jdbc.core.support.JdbcDaoSupport;

publicclassUserDao2extendsJdbcDaoSupport

{

publicvoidinsertData(Stringid,Stringname){

getJdbcTemplate().execute("insertintoxa_testvalues('"+id+"',"+name+")");

}

}

然后创建UserService和UserServiceImpl,在UserServiceImpl中,将调用Dao1和Dao2的insertData的方法同时插入两个数据库的内容,稍后,会将事务配置在service层.

UserService.java

Java代码

1.packagecom.xa.service;

2.

3.publicinterfaceUserService

4.{

5.publicvoidinsertBothDatabase(Stringid,Stringname)throwsException;

6.}

packagecom.xa.service;

publicinterfaceUserService

{

publicvoidinsertBothDatabase(Stringid,Stringname)throwsException;

}

UserServiceImpl.java

Java代码

1.packagecom.xa.service;

2.

3.importcom.xa.dao.UserDao1;

4.importcom.xa.dao.UserDao2;

5.

6.publicclassUserServiceImplimplementsUserService

7.{

8.privateUserDao1dao1;

9.

10.privateUserDao2dao2;

11.

12.publicvoidinsertBothDatabase(Stringid,Stringname)throwsException{

13.dao1.insertData(id,name);

14.dao2.insertData(id,name);

15.}

16.

17.publicUserDao1getDao1(){

18.returndao1;

19.}

20.

21.publicvoidsetDao1(UserDao1dao1){

22.this.dao1=dao1;

23.}

24.

25.publicUserDao2getDao2(){

26.returndao2;

27.}

28.

29.publicvoidsetDao2(UserDao2dao2){

30.this.dao2=dao2;

31.}

32.}

packagecom.xa.service;

importcom.xa.dao.UserDao1;

importcom.xa.dao.UserDao2;

publicclassUserServiceImplimplementsUserService

{

privateUserDao1dao1;

privateUserDao2dao2;

publicvoidinsertBothDatabase(Stringid,Stringname)throwsException{

dao1.insertData(id,name);

dao2.insertData(id,name);

}

publicUserDao1getDao1(){

returndao1;

}

publicvoidsetDao1(UserDao1dao1){

this.dao1=dao1;

}

publicUserDao2getDao2(){

returndao2;

}

publicvoidsetDao2(UserDao2dao2){

this.dao2=dao2;

}

}

UserServiceImpl.java的代码可以看到,在insertBothDatabase方法中,调用了两个Dao的方法.

一个JOTM(JavaOpenTransactionManager)是ObjectWeb的一个开源JTA实现,本身也是开源应用程序服务器JOnAS(JavaOpenApplicationServer)的一部分,为其提供JTA分布式事务的功能。Spring对JOTM提供了较好的支持,提供了一个org.springframework.transaction.jta.JotmFactoryBean的支持类,在Spring2.0中也包含了JOTM相关的一些library。

jotm的下载地址为http://jotm.objectweb.org,最新版本为2.0.10.

下载完成后解压缩,然后打开jotm下面conf文件夹,拷贝carol.properties文件到classpath中,并修改这个文件如下

carol.properties

Java代码

1.#donotuseCAROLJNDIwrapper

2.carol.start.jndi=false

3.

4.#donotstartanameserver

5.carol.start.ns=false

6.

7.#NamingFactory

8.carol.jndi.java.naming.factory.url.pkgs=org.apache.naming

#donotuseCAROLJNDIwrapper

carol.start.jndi=false

#donotstartanameserver

carol.start.ns=false

#NamingFactory

carol.jndi.java.naming.factory.url.pkgs=org.apache.naming

上面配置文件的目的是不使用JNDI的方式来加载JOTM的配置,当然也可以根据需要选择其它的一些配置,例如JTOM所提供的默认配置。

然后开始在Spring上下文中配置JOTM,在classpath中建立一个ApplicationContext-jotm.xml,配置如下

ApplicationContext-jotm.xml

Java代码

1.<?xmlversion="1.0"encoding="UTF-8"?>

2.<beansxmlns="http://www.springframework.org/schema/beans"

3.xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

4.xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

5.

6.<beanid="jotm"class="org.springframework.transaction.jta.JotmFactoryBean"/>

7.

8.<beanid="txManager"class="org.springframework.transaction.jta.JtaTransactionManager">

9.<propertyname="userTransaction"ref="jotm"/>

10.</bean>

11.

12.<beanid="ds1"class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"destroy-method="shutdown">

13.<propertyname="dataSource">

14.<beanclass="org.enhydra.jdbc.standard.StandardXADataSource"destroy-method="shutdown">

15.<propertyname="transactionManager"ref="jotm"/>

16.<propertyname="driverName"value="com.mysql.jdbc.Driver"/>

17.<propertyname="url"value="jdbc:MySQL://localhost:3306/test"/>

18.</bean>

19.</property>

20.<propertyname="user"value="root"/>

21.<propertyname="password"value="admin"/>

22.</bean>

23.

24.<beanid="ds2"class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"destroy-method="shutdown">

25.<propertyname="dataSource">

26.<beanclass="org.enhydra.jdbc.standard.StandardXADataSource"destroy-method="shutdown">

27.<propertyname="transactionManager"ref="jotm"/>

28.<propertyname="driverName"value="com.mysql.jdbc.Driver"/>

29.<propertyname="url"value="jdbc:MySQL://localhost:3306/test2"/>

30.</bean>

31.</property>

32.<propertyname="user"value="root"/>

33.<propertyname="password"value="admin"/>

34.</bean>

35.

36.<beanid="template1"class="org.springframework.jdbc.core.JdbcTemplate">

37.<propertyname="dataSource"ref="ds1"/>

38.</bean>

39.

40.<beanid="template2"class="org.springframework.jdbc.core.JdbcTemplate">

41.<propertyname="dataSource"ref="ds2"/>

42.</bean>

43.

44.<beanid="dao1"class="com.xa.dao.UserDao1">

45.<propertyname="jdbcTemplate">

46.<refbean="template1"></ref>

47.</property>

48.</bean>

49.

50.<beanid="dao2"class="com.xa.dao.UserDao2">

51.<propertyname="jdbcTemplate">

52.<refbean="template2"></ref>

53.</property>

54.</bean>

55.

56.<beanid="userServiceTarget"class="com.xa.service.UserServiceImpl">

57.<propertyname="dao1"ref="dao1"/>

58.<propertyname="dao2"ref="dao2"/>

59.</bean>

60.

61.

62.<beanid="userTest"class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">

63.<propertyname="transactionManager">

64.<refbean="txManager"/>

65.</property>

66.<propertyname="target">

67.<refbean="userServiceTarget"/>

68.</property>

69.<propertyname="transactionAttributes">

70.<props>

71.<propkey="insert*">PROPAGATION_REQUIRED,-Exception</prop>

72.</props>

73.</property>

74.</bean>

75.</beans>

<?xmlversion="1.0"encoding="UTF-8"?>

<beansxmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<beanid="jotm"class="org.springframework.transaction.jta.JotmFactoryBean"/>

<beanid="txManager"class="org.springframework.transaction.jta.JtaTransactionManager">

<propertyname="userTransaction"ref="jotm"/>

</bean>

<beanid="ds1"class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"destroy-method="shutdown">

<propertyname="dataSource">

<beanclass="org.enhydra.jdbc.standard.StandardXADataSource"destroy-method="shutdown">

<propertyname="transactionManager"ref="jotm"/>

<propertyname="driverName"value="com.mysql.jdbc.Driver"/>

<propertyname="url"value="jdbc:MySQL://localhost:3306/test"/>

</bean>

</property>

<propertyname="user"value="root"/>

<propertyname="password"value="admin"/>

</bean>

<beanid="ds2"class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"destroy-method="shutdown">

<propertyname="dataSource">

<beanclass="org.enhydra.jdbc.standard.StandardXADataSource"destroy-method="shutdown">

<propertyname="transactionManager"ref="jotm"/>

<propertyname="driverName"value="com.mysql.jdbc.Driver"/>

<propertyname="url"value="jdbc:MySQL://localhost:3306/test2"/>

</bean>

</property>

<propertyname="user"value="root"/>

<propertyname="password"value="admin"/>

</bean>

<beanid="template1"class="org.springframework.jdbc.core.JdbcTemplate">

<propertyname="dataSource"ref="ds1"/>

</bean>

<beanid="template2"class="org.springframework.jdbc.core.JdbcTemplate">

<propertyname="dataSource"ref="ds2"/>

</bean>

<beanid="dao1"class="com.xa.dao.UserDao1">

<propertyname="jdbcTemplate">

<refbean="template1"></ref>

</property>

</bean>

<beanid="dao2"class="com.xa.dao.UserDao2">

<propertyname="jdbcTemplate">

<refbean="template2"></ref>

</property>

</bean>

<beanid="userServiceTarget"class="com.xa.service.UserServiceImpl">

<propertyname="dao1"ref="dao1"/>

<propertyname="dao2"ref="dao2"/>

</bean>

<beanid="userTest"class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">

<propertyname="transactionManager">

<refbean="txManager"/>

</property>

<propertyname="target">

<refbean="userServiceTarget"/>

</property>

<propertyname="transactionAttributes">

<props>

<propkey="insert*">PROPAGATION_REQUIRED,-Exception</prop>

</props>

</property>

</bean>

</beans>

上面是一个完整的Spring上下文配置,可以看第一个bean“jotm”,实际上引用了Spring内部所提供的对JOTM支持的工厂类,参考下面的配置代码段

Java代码

1.<beanid="jotm"class="org.springframework.transaction.jta.JotmFactoryBean"/>

<beanid="jotm"class="org.springframework.transaction.jta.JotmFactoryBean"/>

随后,配置了JTA事务管理器,并且在管理器中使用上面所配置的jotm,如下面的代码

Java代码

1.<beanid="txManager"class="org.springframework.transaction.jta.JtaTransactionManager">

2.<propertyname="userTransaction"ref="jotm"/>

3.</bean>

<beanid="txManager"class="org.springframework.transaction.jta.JtaTransactionManager">

<propertyname="userTransaction"ref="jotm"/>

</bean>

再接下来就是配置多个数据源了,使用jotm提供的org.enhydra.jdbc.pool.StandardXAPoolDataSource类,根据类名可以明确地看出它是用以配置多个数据源的啦,配置的代码如下

Java代码

1.<beanid="ds1"class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"destroy-method="shutdown">

2.<propertyname="dataSource">

3.<beanclass="org.enhydra.jdbc.standard.StandardXADataSource"destroy-method="shutdown">

4.<propertyname="transactionManager"ref="jotm"/>

5.<propertyname="driverName"value="com.mysql.jdbc.Driver"/>

6.<propertyname="url"value="jdbc:MySQL://localhost:3306/test"/>

7.</bean>

8.</property>

9.<propertyname="user"value="root"/>

10.<propertyname="password"value="admin"/>

11.</bean>

12.

13.<beanid="ds2"class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"destroy-method="shutdown">

14.<propertyname="dataSource">

15.<beanclass="org.enhydra.jdbc.standard.StandardXADataSource"destroy-method="shutdown">

16.<propertyname="transactionManager"ref="jotm"/>

17.<propertyname="driverName"value="com.mysql.jdbc.Driver"/>

18.<propertyname="url"value="jdbc:MySQL://localhost:3306/test2"/>

19.</bean>

20.</property>

21.<propertyname="user"value="root"/>

22.<propertyname="password"value="admin"/>

23.</bean>

<beanid="ds1"class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"destroy-method="shutdown">

<propertyname="dataSource">

<beanclass="org.enhydra.jdbc.standard.StandardXADataSource"destroy-method="shutdown">

<propertyname="transactionManager"ref="jotm"/>

<propertyname="driverName"value="com.mysql.jdbc.Driver"/>

<propertyname="url"value="jdbc:MySQL://localhost:3306/test"/>

</bean>

</property>

<propertyname="user"value="root"/>

<propertyname="password"value="admin"/>

</bean>

<beanid="ds2"class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"destroy-method="shutdown">

<propertyname="dataSource">

<beanclass="org.enhydra.jdbc.standard.StandardXADataSource"destroy-method="shutdown">

<propertyname="transactionManager"ref="jotm"/>

<propertyname="driverName"value="com.mysql.jdbc.Driver"/>

<propertyname="url"value="jdbc:MySQL://localhost:3306/test2"/>

</bean>

</property>

<propertyname="user"value="root"/>

<propertyname="password"value="admin"/>

</bean>

这里配置的两个数据源都连接到本地的mysql,实际上可以连接到不同的dbserver和不同类型的数据库,已经经过测试,这里为了方便,在本地建立了两个不同的数据库(test,test2)做测试。

随后的配置基本上和普通的Spring上下文配置相同了,根据不同的数据源配置两个jdbcTemplate,两个dao分别引用不同的jdbcTemplate,将两个dao注入到UserService中,最后将service纳入事务管理,并在事务代理配置中配置回滚规则,意思为如遇异常,则强制回滚内容。配置如下所示

Java代码

1.<propertyname="transactionAttributes">

2.<props>

3.<propkey="insert*">PROPAGATION_REQUIRED,-Exception</prop>

4.</props>

5.</property>

<propertyname="transactionAttributes">

<props>

<propkey="insert*">PROPAGATION_REQUIRED,-Exception</prop>

</props>

</property>

这样,一个使用JOTMJTA事务的简单应用算大致成型了,最后,写一个JUnit,来测试一下结果

TestXa.java

Java代码

1.packagecom.xa;

2.

3.importorg.springframework.context.ApplicationContext;

4.importorg.springframework.test.AbstractDependencyInjectionSpringContextTests;

5.

6.importcom.xa.service.UserService;

7.

8.publicclassTestXaextendsAbstractDependencyInjectionSpringContextTests

9.{

10.protectedString[]getConfigLocations(){

11.returnnewString[]{"classpath:ApplicationContext-jotm.xml"};

12.}

13.

14.publicvoidtestInsertBothDatabase(){

15.ApplicationContextctx=this.getApplicationContext();

16.UserServiceut=(UserService)ctx.getBean("userTest");

17.try{

18.ut.insertBothDatabase("1",null);

19.}

20.catch(Exceptione){

21.e.printStackTrace();

22.}

23.}

24.}

packagecom.xa;

importorg.springframework.context.ApplicationContext;

importorg.springframework.test.AbstractDependencyInjectionSpringContextTests;

importcom.xa.service.UserService;

publicclassTestXaextendsAbstractDependencyInjectionSpringContextTests

{

protectedString[]getConfigLocations(){

returnnewString[]{"classpath:ApplicationContext-jotm.xml"};

}

publicvoidtestInsertBothDatabase(){

ApplicationContextctx=this.getApplicationContext();

UserServiceut=(UserService)ctx.getBean("userTest");

try{

ut.insertBothDatabase("1",null);

}

catch(Exceptione){

e.printStackTrace();

}

}

}

在test中,调用了UserService的insertBothDatabase方法,有两个参数,userId和UserName,另外在方法的实现中调用了两个使用不同数据源dao,分别向两个不同的数据库插入输入,而test2数据库的xa_test表中,name字段是不允许为空的,因此,在插入test2数据库时会失败.

运行这个test,然后察看数据库结果:),test和test2数据库中都没有插入成功,看serviceImpl中的代码可以知道,逻辑上dao1会先于dao2执行,但是由于JTA事务,在dao2插入数据出现异常时整个事务被回滚,由于事务被配置在service层,dao1和dao2都被纳入一个事务进行管理,呵呵。修改一下方法的参数,修改为

Java代码

1.ut.insertBothDatabase("1","name1");

ut.insertBothDatabase("1","name1");

然后再试试test看数据库结果,如何?

第三节将简单介绍Atomikos在Spring中的配置和使用。

简单的应用已经建立,随后下一节将说明如何配置JOTM以及在Spring中的相关配置.

前面简单介绍了JOTM如何在Spring中配置,并如何使用它的JTA事务,本节将介绍Atomikos如何与Spring集成,并使用它的JTA事务。

Atomikos,是一个基于Java的开源事务管理器,提供了事务管理和连接池,不需要应用服务器支持,支持JDBC和JMS事务,能提供对Spring,Hibernate的集成,有兴趣多了解的可以直接参考说明文当,有详细的介绍和使用说明。

Atomikos可以到http://www.atomikos.com/products.html#ate下载,最新版本是3.2.0

首先,仍然是一个相关的配置文件,用来设置相关的环境,打开解压缩后Atomikos根目录,拷贝jta.properties到classpath中,并修改为如下内容

jta.properties

Java代码

1.com.atomikos.icatch.service=com.atomikos.icatch.standalone.UserTransactionServiceFactory

2.com.atomikos.icatch.console_file_name=tm.out

3.com.atomikos.icatch.log_base_name=tmlog

4.com.atomikos.icatch.tm_unique_name=com.atomikos.spring.jdbc.tm

5.com.atomikos.icatch.console_log_level=INFO

com.atomikos.icatch.service=com.atomikos.icatch.standalone.UserTransactionServiceFactory

com.atomikos.icatch.console_file_name=tm.out

com.atomikos.icatch.log_base_name=tmlog

com.atomikos.icatch.tm_unique_name=com.atomikos.spring.jdbc.tm

com.atomikos.icatch.console_log_level=INFO

随后,是Spring上下文配置,建立一个名为ApplicationContext-atomikos.xml的Spring上下文

ApplicationContext-atomikos.xml

Java代码

1.<?xmlversion="1.0"encoding="UTF-8"?>

2.<beansxmlns="http://www.springframework.org/schema/beans"

3.xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

4.xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

5.<!--XADatasource-->

6.<beanid="datasource1"class="com.atomikos.jdbc.SimpleDataSourceBean"init-method="init"destroy-method="close">

7.<propertyname="uniqueResourceName">

8.<value>mysql/main</value>

9.</property>

10.<propertyname="xaDataSourceClassName">

11.<value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</value>

12.</property>

13.<propertyname="xaDataSourceProperties">

14.<value>URL=jdbc:mysql://localhost:3306/test;user=root;password=admin</value>

15.</property>

16.<propertyname="exclusiveConnectionMode">

17.<value>true</value>

18.</property>

19.<propertyname="connectionPoolSize">

20.<value>3</value>

21.</property>

22.<propertyname="validatingQuery">

23.<value>SELECT1</value>

24.</property>

25.</bean>

26.

27.<beanid="datasource2"class="com.atomikos.jdbc.SimpleDataSourceBean"init-method="init"destroy-method="close">

28.<propertyname="uniqueResourceName">

29.<value>mysql/news</value>

30.</property>

31.<propertyname="xaDataSourceClassName">

32.<value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</value>

33.</property>

34.<propertyname="xaDataSourceProperties">

35.<value>URL=jdbc:mysql://localhost:3306/test2;user=root;password=admin</value>

36.</property>

37.<propertyname="exclusiveConnectionMode">

38.<value>true</value>

39.</property>

40.<propertyname="connectionPoolSize">

41.<value>3</value>

42.</property>

43.<propertyname="validatingQuery">

44.<value>SELECT1</value>

45.</property>

46.</bean>

47.

48.<beanid="template1"class="org.springframework.jdbc.core.JdbcTemplate">

49.<propertyname="dataSource"ref="datasource1"/>

50.</bean>

51.

52.<beanid="template2"class="org.springframework.jdbc.core.JdbcTemplate">

53.<propertyname="dataSource"ref="datasource2"/>

54.</bean>

55.

56.<beanid="atomikosTransactionManager"class="com.atomikos.icatch.jta.UserTransactionManager"init-method="init"destroy-method="close">

57.<propertyname="forceShutdown"><value>true</value></property>

58.</bean>

59.

60.<beanid="atomikosUserTransaction"class="com.atomikos.icatch.jta.UserTransactionImp">

61.<propertyname="transactionTimeout"value="300"/>

62.</bean>

63.

64.<beanid="springTransactionManager"class="org.springframework.transaction.jta.JtaTransactionManager">

65.<propertyname="transactionManager"><refbean="atomikosTransactionManager"/></property>

66.<propertyname="userTransaction"><refbean="atomikosUserTransaction"/></property>

67.</bean>

68.

69.<beanid="dao1"class="com.xa.dao.UserDao1">

70.<propertyname="jdbcTemplate">

71.<refbean="template1"></ref>

72.</property>

73.</bean>

74.

75.<beanid="dao2"class="com.xa.dao.UserDao2">

76.<propertyname="jdbcTemplate">

77.<refbean="template2"></ref>

78.</property>

79.</bean>

80.<!---->

81.<beanid="userServiceTarget"class="com.xa.service.UserServiceImpl">

82.<propertyname="dao1"ref="dao1"/>

83.<propertyname="dao2"ref="dao2"/>

84.</bean>

85.

86.<beanid="userTest"class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">

87.<propertyname="transactionManager">

88.<refbean="springTransactionManager"/>

89.</property>

90.<propertyname="target">

91.<refbean="userServiceTarget"/>

92.</property>

93.<propertyname="transactionAttributes">

94.<props>

95.<propkey="insert*">PROPAGATION_REQUIRED,-Exception</prop>

96.</props>

97.</property>

98.</bean>

99.</beans>

<?xmlversion="1.0"encoding="UTF-8"?>

<beansxmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<!--XADatasource-->

<beanid="datasource1"class="com.atomikos.jdbc.SimpleDataSourceBean"init-method="init"destroy-method="close">

<propertyname="uniqueResourceName">

<value>mysql/main</value>

</property>

<propertyname="xaDataSourceClassName">

<value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</value>

</property>

<propertyname="xaDataSourceProperties">

<value>URL=jdbc:mysql://localhost:3306/test;user=root;password=admin</value>

</property>

<propertyname="exclusiveConnectionMode">

<value>true</value>

</property>

<propertyname="connectionPoolSize">

<value>3</value>

</property>

<propertyname="validatingQuery">

<value>SELECT1</value>

</property>

</bean>

<beanid="datasource2"class="com.atomikos.jdbc.SimpleDataSourceBean"init-method="init"destroy-method="close">

<propertyname="uniqueResourceName">

<value>mysql/news</value>

</property>

<propertyname="xaDataSourceClassName">

<value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</value>

</property>

<propertyname="xaDataSourceProperties">

<value>URL=jdbc:mysql://localhost:3306/test2;user=root;password=admin</value>

</property>

<propertyname="exclusiveConnectionMode">

<value>true</value>

</property>

<propertyname="connectionPoolSize">

<value>3</value>

</property>

<propertyname="validatingQuery">

<value>SELECT1</value>

</property>

</bean>

<beanid="template1"class="org.springframework.jdbc.core.JdbcTemplate">

<propertyname="dataSource"ref="datasource1"/>

</bean>

<beanid="template2"class="org.springframework.jdbc.core.JdbcTemplate">

<propertyname="dataSource"ref="datasource2"/>

</bean>

<beanid="atomikosTransactionManager"class="com.atomikos.icatch.jta.UserTransactionManager"init-method="init"destroy-method="close">

<propertyname="forceShutdown"><value>true</value></property>

</bean>

<beanid="atomikosUserTransaction"class="com.atomikos.icatch.jta.UserTransactionImp">

<propertyname="transactionTimeout"value="300"/>

</bean>

<beanid="springTransactionManager"class="org.springframework.transaction.jta.JtaTransactionManager">

<propertyname="transactionManager"><refbean="atomikosTransactionManager"/></property>

<propertyname="userTransaction"><refbean="atomikosUserTransaction"/></property>

</bean>

<beanid="dao1"class="com.xa.dao.UserDao1">

<propertyname="jdbcTemplate">

<refbean="template1"></ref>

</property>

</bean>

<beanid="dao2"class="com.xa.dao.UserDao2">

<propertyname="jdbcTemplate">

<refbean="template2"></ref>

</property>

</bean>

<!---->

<beanid="userServiceTarget"class="com.xa.service.UserServiceImpl">

<propertyname="dao1"ref="dao1"/>

<propertyname="dao2"ref="dao2"/>

</bean>

<beanid="userTest"class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">

<propertyname="transactionManager">

<refbean="springTransactionManager"/>

</property>

<propertyname="target">

<refbean="userServiceTarget"/>

</property>

<propertyname="transactionAttributes">

<props>

<propkey="insert*">PROPAGATION_REQUIRED,-Exception</prop>

</props>

</property>

</bean>

</beans>

看上下文中的代码,很大部分和JOTM的相似,atomikos使用com.atomikos.jdbc.SimpleDataSourceBean类来创建datasourcebean,这里需要特别注意

Java代码

1.<propertyname="uniqueResourceName">

2.<value>mysql/main</value>

3.</property>

<propertyname="uniqueResourceName">

<value>mysql/main</value>

</property>

Java代码

1.<propertyname="uniqueResourceName">

2.<value>mysql/news</value>

3.</property>

<propertyname="uniqueResourceName">

<value>mysql/news</value>

</property>

上面的代码为每个Datasource配置了一个唯一的名称,名称不允许相同,否则将会使用同一个datasource,而不会出现异常。

另外在配置文件中定义了Atomikos的事务管理器,并在Spring的JtaTransactionManager中引用

Java代码

1.<beanid="atomikosTransactionManager"class="com.atomikos.icatch.jta.UserTransactionManager"init-method="init"destroy-method="close">

2.<propertyname="forceShutdown"><value>true</value></property>

3.</bean>

4.

5.<beanid="atomikosUserTransaction"class="com.atomikos.icatch.jta.UserTransactionImp">

6.<propertyname="transactionTimeout"value="300"/>

7.</bean>

8.

9.<beanid="springTransactionManager"class="org.springframework.transaction.jta.JtaTransactionManager">

10.<propertyname="transactionManager"><refbean="atomikosTransactionManager"/></property>

11.<propertyname="userTransaction"><refbean="atomikosUserTransaction"/></property>

12.</bean>

<beanid="atomikosTransactionManager"class="com.atomikos.icatch.jta.UserTransactionManager"init-method="init"destroy-method="close">

<propertyname="forceShutdown"><value>true</value></property>

</bean>

<beanid="atomikosUserTransaction"class="com.atomikos.icatch.jta.UserTransactionImp">

<propertyname="transactionTimeout"value="300"/>

</bean>

<beanid="springTransactionManager"class="org.springframework.transaction.jta.JtaTransactionManager">

<propertyname="transactionManager"><refbean="atomikosTransactionManager"/></property>

<propertyname="userTransaction"><refbean="atomikosUserTransaction"/></property>

</bean>

其它的代码没什么特别,和JOTM配置基本相同,JdbcTemplate,DAO,Service,事务代理等等....

仍然使用TestXa.java,修改成引用ApplicationContext-atomikos.xml的上下文配置

Java代码

1.protectedString[]getConfigLocations(){

2.//returnnewString[]{"classpath:ApplicationContext-jotm.xml"};

3.returnnewString[]{"classpath:ApplicationContext-atomikos.xml"};

4.}

protectedString[]getConfigLocations(){

//returnnewString[]{"classpath:ApplicationContext-jotm.xml"};

returnnewString[]{"classpath:ApplicationContext-atomikos.xml"};

}

运行test,然后查看数据库状态,

然后修改方法参数使其不违反数据库约束,再运行Test观察数据库:)。

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