spring分布式事宜实现

spring分布式事务实现

藏自：http://log-cd.iteye.com/blog/807607

分布式事务是指操作多个数据库之间的事务，spring的org.springframework.transaction.jta.JtaTransactionManager，提供了分布式事务支持。如果使用WAS的JTA支持，把它的属性改为WebSphere对应的TransactionManager。
??? 在tomcat下，是没有分布式事务的，不过可以借助于第三方软件jotm（Java Open Transaction Manager ）和AtomikosTransactionsEssentials实现，在spring中分布式事务是通过jta（jotm，atomikos）来进行实现。
1、http://jotm.objectweb.org/
2、http://www.atomikos.com/Main/TransactionsEssentials

一、使用JOTM例子
(1)、Dao及实现

public interface GenericDao {public int save(String ds, String sql, Object[] obj) throws Exception;public int findRowCount(String ds, String sql);}

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public class GenericDaoImpl implements GenericDao{private JdbcTemplate jdbcTemplateA;private JdbcTemplate jdbcTemplateB;public void setJdbcTemplateA(JdbcTemplate jdbcTemplate) {this.jdbcTemplateA = jdbcTemplate;}public void setJdbcTemplateB(JdbcTemplate jdbcTemplate) {this.jdbcTemplateB = jdbcTemplate;}public int save(String ds, String sql, Object[] obj) throws Exception{if(null == ds || "".equals(ds)) return -1;try{if(ds.equals("A")){return this.jdbcTemplateA.update(sql, obj);}else{return this.jdbcTemplateB.update(sql, obj);}}catch(Exception e){e.printStackTrace();throw new Exception("执行" + ds + "数据库时失败！");}}public int findRowCount(String ds, String sql) {if(null == ds || "".equals(ds)) return -1;if(ds.equals("A")){return this.jdbcTemplateA.queryForInt(sql);}else{return this.jdbcTemplateB.queryForInt(sql);}}}


(2)、Service及实现

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public interface UserService {public void saveUser() throws Exception;}

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public class UserServiceImpl implements UserService{private GenericDao genericDao;public void setGenericDao(GenericDao genericDao) {this.genericDao = genericDao;}public void saveUser() throws Exception {String userName = "user_" + Math.round(Math.random()*10000);System.out.println(userName);StringBuilder sql = new StringBuilder();sql.append(" insert into t_user(username, gender) values(?,?); ");Object[] objs = new Object[]{userName,"1"};genericDao.save("A", sql.toString(), objs);sql.delete(0, sql.length());sql.append(" insert into t_user(name, sex) values(?,?); ");objs = new Object[]{userName,"男的"};//值超出范围genericDao.save("B", sql.toString(), objs);}}


(3)、applicationContext-jotm.xml

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<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"><description>springJTA</description><!--指定Spring配置中用到的属性文件--> <bean id="propertyConfig" value="500000"/></bean><!-- JTA事务管理器 --><bean id="jtaTransactionManager" ref="jotm" /> </bean> <!-- 数据源A --> <bean id="dataSourceA" destroy-method="shutdown"> <property name="dataSource"> <bean destroy-method="shutdown"> <property name="transactionManager" ref="jotm"/> <property name="driverName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> </bean> </property> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> <!-- 数据源B --> <bean id="dataSourceB" destroy-method="shutdown"> <property name="dataSource"> <bean destroy-method="shutdown"> <property name="transactionManager" ref="jotm"/> <property name="driverName" value="${jdbc2.driver}"/> <property name="url" value="${jdbc2.url}"/> </bean> </property> <property name="user" value="${jdbc2.username}"/> <property name="password" value="${jdbc2.password}"/> </bean> <bean id = "jdbcTemplateA" class = "org.springframework.jdbc.core.JdbcTemplate"> <property name = "dataSource" ref="dataSourceA"/> </bean> <bean id = "jdbcTemplateB" class = "org.springframework.jdbc.core.JdbcTemplate"> <property name = "dataSource" ref="dataSourceB"/> </bean> <!-- 事务切面配置 --> <aop:config> <aop:pointcut id="pointCut"expression="execution(* com.logcd.service..*.*(..))"/><!-- 包及其子包下的所有方法 --> <aop:advisor pointcut-ref="pointCut" advice-ref="txAdvice"/> <aop:advisor pointcut="execution(* *..common.service..*.*(..))" advice-ref="txAdvice"/></aop:config> <!-- 通知配置 --> <tx:advice id="txAdvice" transaction-manager="jtaTransactionManager"> <tx:attributes> <tx:method name="delete*" rollback-for="Exception"/> <tx:method name="save*" rollback-for="Exception"/> <tx:method name="update*" rollback-for="Exception"/> <tx:method name="find*" read-only="true" rollback-for="Exception"/> </tx:attributes> </tx:advice> <bean id="genericDao" autowire="byName"></bean><bean id="userService" autowire="byName"></bean></beans>


(4)、测试

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public class TestUserService{private static UserService userService;@BeforeClasspublic static void init(){ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext-jotm.xml");userService = (UserService)app.getBean("userService");}@Testpublic void save(){System.out.println("begin...");try{userService.saveUser();}catch(Exception e){System.out.println(e.getMessage());}System.out.println("finish...");}}


二、关于使用atomikos实现
(1)、数据源配置

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<bean id="dataSourceA" init-method="init" destroy-method="close"><property name="uniqueResourceName"><value>${datasource.uniqueResourceName}</value></property><property name="xaDataSourceClassName"> <value>${database.driver_class}</value> </property> <property name="xaDataSourceProperties"><value>URL=${database.url};user=${database.username};password=${database.password}</value> </property> <property name="exclusiveConnectionMode"> <value>${connection.exclusive.mode}</value> </property><property name="connectionPoolSize"> <value>${connection.pool.size}</value></property><property name="connectionTimeout"><value>${connection.timeout}</value></property><property name="validatingQuery"> <value>SELECT 1</value> </property> </bean>


(2)、事务配置

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<bean id="atomikosTransactionManager" init-method="init" destroy-method="close"> <property name="forceShutdown" value="true"/> </bean> <bean id="atomikosUserTransaction" value="${transaction.timeout}"/> </bean> <!-- JTA事务管理器 --> <bean id="springTransactionManager" ref="atomikosTransactionManager"/> <property name="userTransaction" ref="atomikosUserTransaction"/> </bean> <!-- 事务切面配置 --> <aop:config> <aop:pointcut id="serviceOperation" expression="execution(* *..service*..*(..))"/> <aop:advisor pointcut-ref="serviceOperation" advice-ref="txAdvice"/> </aop:config><!-- 通知配置 --><tx:advice id="txAdvice" transaction-manager="springTransactionManager"> <tx:attributes><tx:method name="*" rollback-for="Exception"/> </tx:attributes> </tx:advice> lib.rar (5.2 MB) 描述: JOTM使用包 下载次数: 286