ssm框架实现多数据源的配置，本人亲测，项目正在使用。

最新推荐文章于 2025-07-24 21:56:24 发布

海天凭鱼阔

最新推荐文章于 2025-07-24 21:56:24 发布

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文章标签： ssm集成多数据源

本文链接：https://blog.youkuaiyun.com/qq_38063475/article/details/78880698

1、这是项目的目录结构

2、Web.XML

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">


<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath*:spring/applicationContext-*.xml,
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>


<filter>
<filter-name>CharacterEncodingFilter</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>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

3、sqlMapConfig.xml

<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

<typeAliases>

<package name="com.gongsi.bean"/>
</typeAliases>

</configuration>

4、applicationContext-core.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
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-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">


<context:annotation-config />

<context:component-scan base-package="com.gongsi.*"></context:component-scan>



<bean id="MydataSource_1" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"></property>
<property name="url" value="jdbc:sqlserver://localhost:****;DatabaseName=**"></property>
<property name="username" value="**"></property>
<property name="password" value="****"></property>
</bean>

<bean id="MydataSource_2" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"></property>
<property name="url" value="jdbc:sqlserver://localhost:****;DatabaseName=****"></property>
<property name="username" value="**"></property>
<property name="password" value="****"></property>
</bean>
<bean id="dataSource" class="com.gongsi.util.DynamicDataSource">
<property name="targetDataSources">
<map key-type="java.lang.String">

<entry key="1" value-ref="MydataSource_1"></entry>
<entry key="2" value-ref="MydataSource_2"></entry>
</map>
</property>

<property name="defaultTargetDataSource" ref="MydataSource_2" />
</bean>

<bean id="MysqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>

<property name="configLocation" value="classpath:mapper/sqlMapConfig.xml"></property>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

<property name="basePackage" value="com.gongsi.mapper"></property>

<property name="sqlSessionFactoryBeanName" value="MysqlSessionFactory"></property>
</bean>
</beans>

5、applicationContext-transaction.xml

6、springmvc.xml

7、自定义注解目录

8、DataSource.java

package com.gongsi.util;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.ElementType;

/*@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)*/
@Target({ElementType.TYPE,ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface DataSource {
String value();
}

9、DataSourceAspect.java

package com.gongsi.util;
import java.lang.reflect.Method;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.reflect.MethodSignature;

public class DataSourceAspect {

/**
* 拦截目标方法，获取由@DataSource指定的数据源标识，设置到线程存储中以便切换数据源
*
* @param point
* @throws Exception
*/
public void intercept(JoinPoint point) throws Exception {
Class<?> target = point.getTarget().getClass();
MethodSignature signature = (MethodSignature) point.getSignature();
// 默认使用目标类型的注解，如果没有则使用其实现接口的注解
for (Class<?> clazz : target.getInterfaces()) {
resolveDataSource(clazz, signature.getMethod());
}
resolveDataSource(target, signature.getMethod());
}
/**
* 提取目标对象方法注解和类型注解中的数据源标识
*
* @param clazz
* @param method
*/
private void resolveDataSource(Class<?> clazz, Method method) {
try {
Class<?>[] types = method.getParameterTypes();
// 默认使用类型注解
if (clazz.isAnnotationPresent(DataSource.class)) {
DataSource source = clazz.getAnnotation(DataSource.class);
DynamicDataSourceHolder.setDataSource(source.value());
}
// 方法注解可以覆盖类型注解
Method m = clazz.getMethod(method.getName(), types);
if (m != null && m.isAnnotationPresent(DataSource.class)) {
DataSource source = m.getAnnotation(DataSource.class);
DynamicDataSourceHolder.setDataSource(source.value());
}
} catch (Exception e) {
System.out.println(clazz + ":" + e.getMessage());
}
}

}

10、DynamicDataSource.java

package com.gongsi.util;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

public class DynamicDataSource extends AbstractRoutingDataSource {

@Override
protected Object determineCurrentLookupKey() {
// 从自定义的位置获取数据源标识
return DynamicDataSourceHolder.getDataSource();
}

}

11、DynamicDataSourceHolder.java

package com.gongsi.util;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.ElementType;

public class DynamicDataSourceHolder {
/**
* 注意：数据源标识保存在线程变量中，避免多线程操作数据源时互相干扰
*/
private static final ThreadLocal<String> THREAD_DATA_SOURCE = new ThreadLocal<String>();

public static String getDataSource() {
return THREAD_DATA_SOURCE.get();
}

public static void setDataSource(String dataSource) {
THREAD_DATA_SOURCE.set(dataSource);
}

public static void clearDataSource() {
THREAD_DATA_SOURCE.remove();
}

}