spring 多数据源出错，好像是属性没有注入进去？大神帮忙看看，在线等。。。
先看配置。
<?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-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
">
<!-- 引入属性文件 -->
<context:property-placeholder location="classpath:config/config.properties" />
<!-- 配置数据源 -->
<bean name="dataSource1" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<property name="url" value="${jdbc_url}" />
<property name="username" value="${jdbc_username}" />
<property name="password" value="${jdbc_password}" />
</bean>
<!-- 配置数据源 -->
<bean name="dataSource2" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<property name="url" value="${jdbc_url2}" />
<property name="username" value="${jdbc_username2}" />
<property name="password" value="${jdbc_password2}" />
</bean>
<bean id="dynamicDataSource" class="com.sa.controller.DynamicDataSource" >
<!-- 通过key-value的形式来关联数据源 -->
<property name="targetDataSources">
<map key-type="java.lang.String">
<entry value-ref="dataSource1" key="dataSource1"></entry>
<entry value-ref="dataSource2" key="dataSource2"></entry>
</map>
</property>
<property name="defaultTargetDataSource" ref="dataSource1" >
</property>
</bean>
<!-- myBatis文件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" abstract="true" lazy-init="true">
<property name="dataSource" ref="dynamicDataSource" />
<property name="configLocation" value="classpath:config/mybatis-plugin.xml" />
<property name="mapperLocations" value="classpath:mapper/*.xml" />
</bean>
<!-- SqlSessionTemplate -->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate" scope="prototype">
<constructor-arg index="0" ref="dynamicDataSource" />
<constructor-arg index="1" value="BATCH" /> <!-- 如果想要进行批量操作可加入这个属性 -->
</bean>
<!--<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> -->
<!-- <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> -->
<!--</bean> -->
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dynamicDataSource" />
</bean>
</beans>
继承 import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource 的类
package com.sa.controller;
import java.util.Map;
import org.apache.log4j.Logger;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
import org.springframework.jdbc.datasource.lookup.DataSourceLookup;
public class DynamicDataSource extends AbstractRoutingDataSource {
public static final Logger logger = Logger.getLogger(DynamicDataSource.class.toString());
@Override
protected Object determineCurrentLookupKey() {
String name = ContextHolder.getDbType();
System.out.println("当前数据源 :" + name);
return name;
}
@Override
public void setTargetDataSources(Map targetDataSources) {
super.setTargetDataSources(targetDataSources);
//重点
super.afterPropertiesSet();
}
@Override
public void setDataSourceLookup(DataSourceLookup dataSourceLookup) {
super.setDataSourceLookup(dataSourceLookup);
}
@Override
public void setDefaultTargetDataSource(Object defaultTargetDataSource) {
super.setDefaultTargetDataSource(defaultTargetDataSource);
}
}
线程类
package com.sa.controller;
public class ContextHolder {
private static final ThreadLocal<Object> holder = new ThreadLocal<Object>();
public static void setDbType(String dbType) {
holder.set(dbType);
}
public static String getDbType() {
return (String) holder.get();
}
public static void clearDbType() {
holder.remove();
}
}
启动时异常错误信息
[INFO] [2014-10-16 11:26:44] [Root WebApplicationContext: initialization started]
[INFO] [2014-10-16 11:26:44] [Refreshing Root WebApplicationContext: startup date [Thu Oct 16 11:26:44 CST 2014]; root of context hierarchy]
[INFO] [2014-10-16 11:26:44] [Loading XML bean definitions from class path resource [config/spring.xml]]
[INFO] [2014-10-16 11:26:45] [Loading properties file from class path resource [config/config.properties]]
[INFO] [2014-10-16 11:26:45] [Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1b1a772d: defining beans [org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0,dataSource1,dataSource2,dynamicDataSource,sqlSessionFactory,sqlSession,transactionManager]; root of factory hierarchy]
[ERROR] [2014-10-16 11:26:45] [testWhileIdle is true, validationQuery not set]
[INFO] [2014-10-16 11:26:45] [{dataSource-1} inited]
[ERROR] [2014-10-16 11:26:45] [testWhileIdle is true, validationQuery not set]
[INFO] [2014-10-16 11:26:45] [{dataSource-2} inited]
[INFO] [2014-10-16 11:26:45] [Root WebApplicationContext: initialization completed in 1490 ms]
2014-10-16 11:26:45 org.apache.catalina.core.ApplicationContext log
信息: Initializing Spring FrameworkServlet 'springMvc'
[INFO] [2014-10-16 11:26:45] [FrameworkServlet 'springMvc': initialization started]
[INFO] [2014-10-16 11:26:45] [Refreshing WebApplicationContext for namespace 'springMvc-servlet': startup date [Thu Oct 16 11:26:45 CST 2014]; parent: Root WebApplicationContext]
[INFO] [2014-10-16 11:26:45] [Loading XML bean definitions from class path resource [config/spring-mvc.xml]]
ERROR] [2014-10-16 11:26:47] [Context initialization failed]
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dynamicDataSource' defined in file [E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\saweb_20141012\WEB-INF\classes\com\sa\controller\DynamicDataSource.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Property 'targetDataSources' is required
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1512)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
主要 就是[Context initialization failed]
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dynamicDataSource' defined in file [E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\saweb_20141012\WEB-INF\classes\com\sa\controller\DynamicDataSource.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Property 'targetDataSources' is required 这个错。。。。
------解决思路----------------------
只重写determineCurrentLookupKey 这个方法，其它的都去掉
------解决思路----------------------
http://lyunabc.iteye.com/blog/1544423
看下，对你的问题也许有帮助。
------解决思路----------------------
首先判断在单数据源的时候是否可以正常启动？
在但数据源的时候可以正常启动的话，在此基础上改造多数据源；你现在这种写法主要适合于已经固定的数据源，也即是数据源是可预知的；
就看你写的基本上是这么回事儿，出问题的跟踪调试；
1：把 你spring配置文件中，数据源配置中的
“init-method 是否是必须的呢?可否去掉？
2：
ContextHolder?
这个类里需要指定下数据源，也就是你在配置文件中写的ref的数据源的名称
public static final String DATA_SOURCE_A = "dataSource1";
public static final String DATA_SOURCE_B = "dataSource2";
3：如何切换？
如何切换是根据实际情况来定的，写个过滤器，根据登录或者请求不同路径下面的页面来判断调用哪一个数据库；
ContextHolder.setDbType(ContextHolder.DATA_SOURCE_A);
ContextHolder.setDbType(ContextHolder.DATA_SOURCE_B);
根据符合条件的来进行切换。
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