springmvc+mybatis+pagehelper分页插件整合AbstractRoutingDataSource动态切换数据源（含例子代码） ...-优快云博客

一、前期工作

1）开发工具Eclipse+maven+jdk1.6以上

2）Tomcat服务器

3）技术架构Spring+Mybatis

二、在eclipse一个Maven的Web工程（略）

不懂的同学请参考博客http://www.cnblogs.com/leiOOlei/p/3361633.html

三、web.xml整合Springmvc和druid监控连接池

<?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"  
    version="3.0">  
    <display-name>Archetype Created Web Application</display-name>  
    <!-- Spring和mybatis的配置文件 -->  
    <context-param>  
        <param-name>contextConfigLocation</param-name>  
        <param-value>classpath:spring-mybatis.xml</param-value>  
    </context-param>  
    
    <!-- 编码过滤器 -->  
    <filter>  
        <filter-name>encodingFilter</filter-name>  
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
        <async-supported>true</async-supported>  
        <init-param>  
            <param-name>encoding</param-name>  
            <param-value>UTF-8</param-value>  
        </init-param>  
    </filter>  
    <filter-mapping>  
        <filter-name>encodingFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  
    <!-- druid连接池配置 -->
    <filter>
		<filter-name>DruidWebStatFilter</filter-name>
		<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
		<init-param>
			<param-name>exclusions</param-name>
			<param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
		</init-param>
		<init-param>
			<param-name>sessionStatEnable</param-name>
			<param-value>false</param-value>
		</init-param>
		<init-param>
			<param-name>profileEnable</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>DruidWebStatFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
    <!-- Spring监听器 -->  
    <listener>  
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
    </listener>  
    <!-- 防止Spring内存溢出监听器 -->  
    <listener>  
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>  
    </listener>  
     <listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
  
    <!-- druid连接池配置 -->
  	<servlet>
		<servlet-name>DruidStatView</servlet-name>
		<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>DruidStatView</servlet-name>
		<url-pattern>/druid/*</url-pattern>
	</servlet-mapping>
	
    <!-- Spring MVC servlet -->  
    <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-mvc.xml</param-value>  
        </init-param>  
        <load-on-startup>1</load-on-startup>  
        <async-supported>true</async-supported>  
    </servlet>  
    <servlet-mapping>  
        <servlet-name>SpringMVC</servlet-name>  
        <url-pattern>/</url-pattern>  
    </servlet-mapping>  
    <welcome-file-list>  
        <welcome-file>/index.jsp</welcome-file>  
    </welcome-file-list>  
  
</web-app>

四、Mybatis分页插件 - PageHelper

https://github.com/pagehelper/Mybatis-PageHelper

<?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<settings>
		<setting name="logImpl" value="SLF4J" />
		<!-- 字段为空时仍调用model的set方法或map的put方法 -->
		<setting name="callSettersOnNulls" value="true"/>
	</settings>
	<plugins>
		<!-- 分页查询插件 -->
		<plugin interceptor="com.github.pagehelper.PageHelper">
			<property name="dialect" value="mysql" />
			<property name="reasonable" value="true" />
		</plugin>
	</plugins>
</configuration>

五、springmvc的xml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:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans  
                        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
                        http://www.springframework.org/schema/context  
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd  
                        http://www.springframework.org/schema/mvc  
                        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
                        
    
	<!-- 自动扫描该包，使SpringMVC认为包下用了@controller注解的类是控制器 -->
	<context:component-scan base-package="com.flong.*" />
	<!--避免IE执行AJAX时，返回JSON出现下载文件 -->
	<bean id="mappingJacksonHttpMessageConverter"
		class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
		<property name="supportedMediaTypes">
			<list>
				<value>text/html;charset=UTF-8</value>
			</list>
		</property>
	</bean>
	<!-- 启动SpringMVC的注解功能，完成请求和注解POJO的映射 -->
	<bean
		class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
		<property name="messageConverters">
			<list>
				<ref bean="mappingJacksonHttpMessageConverter" />	<!-- JSON转换器 -->
			</list>
		</property>
	</bean>
	
	
	<!-- 启动SpringMVC的注解功能，完成请求和注解POJO的映射 -->
	<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
		<description>注解controller方法适配器</description>
		<property name="messageConverters">
			<list>
				<!--JSON转换器 -->
				<bean
					class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
					<property name="supportedMediaTypes" value="application/json;charset=UTF-8" />
					<property name="features">
						<array value-type="com.alibaba.fastjson.serializer.SerializerFeature">
							<bean
								class="org.springframework.beans.factory.config.FieldRetrievingFactoryBean">
								<property name="staticField"
									value="com.alibaba.fastjson.serializer.SerializerFeature.DisableCircularReferenceDetect" />
							</bean>
							<value>WriteMapNullValue</value>
							<value>WriteNullStringAsEmpty</value>
						</array>
					</property>
				</bean>
			</list>
		</property>
	</bean>
	
	
	<!-- 定义跳转的文件的前后缀 ，视图模式配置-->
	<!-- <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个 可用的url地址
		<property name="prefix" value="/WEB-INF/jsp/" />
		<property name="suffix" value=".jsp" />
	</bean>
	 -->
	
	<!-- <bean id="velocityConfig" class="org.springframework.web.servlet.view.velocity.VelocityConfigurer">
        <property name="resourceLoaderPath" value="/WEB-INF/jsp/"/>
    </bean> -->

	 
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    
	<!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->
	<bean id="multipartResolver"  
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
        <!-- 默认编码 -->
        <property name="defaultEncoding" value="utf-8" />  
        <!-- 文件大小最大值 -->
        <property name="maxUploadSize" value="10485760000" />  
        <!-- 内存中的最大值 -->
        <property name="maxInMemorySize" value="40960" />  
    </bean> 



     <!-- 内容协商管理器  -->
    <!--1、首先检查路径扩展名（如my.pdf）；2、其次检查Parameter（如my?format=pdf）；3、检查Accept Header-->
    <bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
        <!-- 扩展名至mimeType的映射,即 /user.json => application/json -->
        <property name="favorPathExtension" value="true"/>
        <!-- 用于开启 /userinfo/123?format=json 的支持 -->
        <property name="favorParameter" value="true"/>
        <property name="parameterName" value="format"/>
        <!-- 是否忽略Accept Header -->
        <property name="ignoreAcceptHeader" value="false"/>

        <property name="mediaTypes"> <!--扩展名到MIME的映射；favorPathExtension, favorParameter是true时起作用  -->
            <value>
                json=application/json
                xml=application/xml
                html=text/html
            </value>
        </property>
        <!-- 默认的content type -->
        <property name="defaultContentType" value="text/html"/>
    </bean>

  

<!-- 这个映射配置主要是用来进行静态资源的访问
	  对静态资源文件的访问， 将无法mapping到Controller的path交给default servlet handler处理 
	<mvc:default-servlet-handler/>同等如下配置
 	<mvc:resources mapping="/js/**" location="/js/" cache-period="31556926"/> 
	<mvc:resources mapping="/css/**" location="/css/" />  
	<mvc:resources mapping="/**/**" location="/" />  
    <mvc:resources mapping="/WEB-INF/view/**" location="/WEB-INF/view/" />  -->
    
    <mvc:default-servlet-handler/>
 
  
    
</beans>

六、Spring的AbstractRoutingDataSource实现动态数据源切换

参考博客

http://www.cnblogs.com/davidwang456/p/4318303.html

<?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:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
  	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-3.1.xsd  
                        http://www.springframework.org/schema/context  
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd  
                        http://www.springframework.org/schema/mvc  
                        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
                        http://www.springframework.org/schema/tx 
                        http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
                        http://www.springframework.org/schema/aop 
                        http://www.springframework.org/schema/aop/spring-aop-3.1.xsd  
                        ">
	<!-- 自动扫描 -->
	<context:component-scan base-package="com.flong.*" />
	<!-- 引入配置文件 -->
	<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="location" value="classpath:jdbc.properties" />
	</bean>
	
	<!-- <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" lazy-init="false">
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		初始化连接大小
		<property name="initialSize" value="${jdbc.initialSize}"></property>
		连接池最大数量
		<property name="maxActive" value="${jdbc.maxActive}"></property>
		连接池最大空闲
		<property name="maxIdle" value="${jdbc.maxIdle}"></property>
		连接池最小空闲
		<property name="minIdle" value="${jdbc.minIdle}"></property>
		获取连接最大等待时间
		<property name="maxWait" value="${jdbc.maxWait}"></property>
	</bean>
	 -->
	
	<bean id="dbPasswordCallback" class="com.flong.utils.DBPasswordCallback">
		<description>数据库连接回调密码解密</description>
	</bean>
	<bean id="statFilter" class="com.alibaba.druid.filter.stat.StatFilter" lazy-init="true">
		<description>状态过滤器</description>
		<property name="logSlowSql" value="true" />
		<property name="mergeSql" value="true" />
	</bean>
	
	
	<!-- 操作数据库删除，修改，添加的数据源 -->
	<bean id="writeDataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close" init-method="init" lazy-init="true">
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<!-- 初始化连接大小 -->
		<property name="initialSize" value="${jdbc.initialSize}" />
		<!-- 连接池最大数量 -->
		<property name="maxActive" value="${jdbc.maxActive}" />
		<!-- 连接池最小空闲 -->
		<property name="minIdle" value="${jdbc.minIdle}" />
		<!-- 获取连接最大等待时间 -->
		<property name="maxWait" value="${jdbc.maxWait}" />
		<!-- -->
		<property name="defaultReadOnly" value="true" />
		<property name="proxyFilters">
			<list>
				<ref bean="statFilter" />
			</list>
		</property>
		<property name="filters" value="${druid.filters}" />
		<property name="connectionProperties" value="password=${password}" /> 
 		<property name="passwordCallback" ref="dbPasswordCallback" />  
		<property name="testWhileIdle" value="true" />
		<property name="testOnBorrow" value="false" />
		<property name="testOnReturn" value="false" />
		<property name="validationQuery" value="SELECT 'x'" />
		<property name="timeBetweenLogStatsMillis" value="60000" />
		<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
		<property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}" />
		<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
		<property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}" />
	</bean>



	<!-- 操作数据库读的数据源 -->
	<bean id="readDataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close" init-method="init" lazy-init="true">
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<!-- 初始化连接大小 -->
		<property name="initialSize" value="${jdbc.initialSize}" />
		<!-- 连接池最大数量 -->
		<property name="maxActive" value="${jdbc.maxActive}" />
		<!-- 连接池最小空闲 -->
		<property name="minIdle" value="${jdbc.minIdle}" />
		<!-- 获取连接最大等待时间 -->
		<property name="maxWait" value="${jdbc.maxWait}" />
		<!-- -->
		<property name="defaultReadOnly" value="true" />
		<property name="proxyFilters">
			<list>
				<ref bean="statFilter" />
			</list>
		</property>
		<property name="filters" value="${druid.filters}" />
		<property name="connectionProperties" value="password=${password}" /> 
 		<property name="passwordCallback" ref="dbPasswordCallback" />  
		<property name="testWhileIdle" value="true" />
		<property name="testOnBorrow" value="false" />
		<property name="testOnReturn" value="false" />
		<property name="validationQuery" value="SELECT 'x'" />
		<property name="timeBetweenLogStatsMillis" value="60000" />
		<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
		<property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}" />
		<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
		<property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}" />
	</bean>


	<!--利用AbstractRoutingDataSource实现动态数据源切换  -->
	<bean id="dataSource" class="com.flong.utils.persistence.DynamicChooseDataSource" lazy-init="true">
		<description>数据源</description>
		<property name="targetDataSources">
			<map key-type="java.lang.String" value-type="javax.sql.DataSource">
				<!-- write -->
				<entry key="write" value-ref="writeDataSource" />
				<!-- read -->
				<entry key="read" value-ref="readDataSource" />
			</map>
		</property>
		<!-- 
			从org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource这个类里面可以看到
			defaultTargetDataSource这个对象，根据自己需求的情况默认的情况给一个默认的数据源.
		 -->
		<property name="defaultTargetDataSource" ref="writeDataSource" />
		<property name="methodType">
			<map key-type="java.lang.String">
				<!-- read -->
				<entry key="read" value=",get,select,count,list,query" />
				<!-- write -->
				<entry key="write" value=",add,insert,create,update,delete,remove," />
			</map>
		</property>
	</bean>


	<!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<!-- 添加 mybatis-config配置上去。-->
		<property name="configLocation" value="classpath:mybatis-config.xml" />
		<!-- 扫描com.flong.pojo下面的所有类，减少mybatis的mapping所有实体类的路径（parameterType），直接写一个JavaBean即可 -->
		<property name="typeAliasesPackage" value="com.flong.pojo"/>
		<!-- 自动扫描mapping.xml文件 -->
		<property name="mapperLocations" value="classpath:mapping/*.xml"></property>
	</bean>

	<!-- DAO接口所在包名，Spring会自动查找其下的类 -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.flong.dao" />
		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
	</bean>

	<!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource" />
	</bean>


	<!-- 配置事务通知属性 -->  
    <tx:advice id="txAdvice" transaction-manager="transactionManager">  
        <!-- 定义事务传播属性 -->  
        <tx:attributes>  
            <tx:method name="insert*" propagation="REQUIRED" />  
            <tx:method name="update*" propagation="REQUIRED" />  
            <tx:method name="edit*" propagation="REQUIRED" />  
            <tx:method name="save*" propagation="REQUIRED" />  
            <tx:method name="add*" propagation="REQUIRED" />  
            <tx:method name="new*" propagation="REQUIRED" />  
            <tx:method name="set*" propagation="REQUIRED" />  
            <tx:method name="remove*" propagation="REQUIRED" />  
            <tx:method name="delete*" propagation="REQUIRED" />  
            <tx:method name="change*" propagation="REQUIRED" />  
            <tx:method name="get*" propagation="REQUIRED" read-only="true" />  
            <tx:method name="find*" propagation="REQUIRED" read-only="true" />  
            <tx:method name="load*" propagation="REQUIRED" read-only="true" />  
            <tx:method name="*" propagation="REQUIRED" read-only="true" />  
        </tx:attributes>  
    </tx:advice>  
    
    
     <!-- 配置事务切面 -->  
    <aop:config>  
        <aop:pointcut id="serviceOperation" expression="execution(* com.flong.service.*.*(..))" />  
        <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceOperation" />  
    </aop:config>  


</beans>

七、mybatis的xml映射配置和数据库

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.flong.dao.UserMapper">
	<resultMap id="BaseResultMap" type="com.flong.pojo.entity.User">
		<id column="id" property="id" jdbcType="INTEGER" />
		<result column="username" property="username" jdbcType="VARCHAR" />
		<result column="password" property="password" jdbcType="VARCHAR" />
		<result column="age" property="age" jdbcType="INTEGER" />
	</resultMap>


	<sql id="Base_Column_List">
		id, username, password, age
	</sql>

	<!-- spring-mybatis.xml已经配置了可以省略包路径，直接用Vo名称即可 -->
	<select id="list" resultType="User">
		select
		<include refid="Base_Column_List" />
		from user
	</select>


	<select id="selectLogin" resultMap="BaseResultMap"
		parameterType="String">
		select * from user
		where username = #{username,jdbcType=VARCHAR}
	</select>


	<select id="selectId" resultMap="BaseResultMap" parameterType="java.lang.Integer">
		select * from user
		where id = #{id,jdbcType=INTEGER}
	</select>


	<select id="selectByPrimaryKey" resultMap="BaseResultMap"
		parameterType="java.lang.Integer">
		select
		<include refid="Base_Column_List" />
		from user
		where id = #{id,jdbcType=INTEGER}
	</select>


	<select id="query" parameterType="java.util.Map" resultMap="BaseResultMap">
		select
		<include refid="Base_Column_List" />
		from user where 1=1
		<if test="username != null">and username=#{username}</if>
		<if test="password != null">and password=#{password}</if>
		<if test="keyword != null">
			and (username like "%"#{keyword}"%" or password like "%"#{keyword}"%" )
		</if>
	</select>
	
	

	<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
		delete from user
		where id = #{id,jdbcType=INTEGER}
	</delete>


	<insert id="insert" useGeneratedKeys="true" keyProperty="id" parameterType="com.flong.pojo.entity.User">
		insert into user (username, password, age,typeid)
		values 
		(
			#{username,jdbcType=VARCHAR},
			#{password,jdbcType=VARCHAR},
			#{age,jdbcType=INTEGER},
			#{typeid,jdbcType=VARCHAR}
		)
	</insert>



	<insert id="insertSelective" parameterType="com.flong.pojo.entity.User">
		insert into user
		<trim prefix="(" suffix=")" suffixOverrides=",">
			<if test="id != null">
				id,
			</if>
			<if test="username != null">
				username,
			</if>
			<if test="password != null">
				password,
			</if>
			<if test="age != null">
				age,
			</if>
			<if test="typeid != null">
				typeid,
			</if>
		</trim>
		<trim prefix="values (" suffix=")" suffixOverrides=",">
			<if test="id != null">
				#{id,jdbcType=INTEGER},
			</if>
			<if test="username != null">
				#{username,jdbcType=VARCHAR},
			</if>
			<if test="password != null">
				#{password,jdbcType=VARCHAR},
			</if>
			<if test="age != null">
				#{age,jdbcType=INTEGER},
			</if>
			<if test="typeid != null">
				#{typeid,jdbcType=INTEGER},
			</if>
		</trim>
	</insert>
	
	
	<update id="updateByPrimaryKeySelective" parameterType="com.flong.pojo.entity.User">
		update user
		<set>
			<if test="username != null">
				username = #{username,jdbcType=VARCHAR},
			</if>
			<if test="password != null">
				password = #{password,jdbcType=VARCHAR},
			</if>
			<if test="age != null">
				age = #{age,jdbcType=INTEGER},
			</if>
		</set>
		where id = #{id,jdbcType=INTEGER}
	</update>
	
	
	
	<update id="updateByPrimaryKey" parameterType="com.flong.pojo.entity.User">
		update user
		set username = #{username,jdbcType=VARCHAR},
		password = #{password,jdbcType=VARCHAR},
		age = #{age,jdbcType=INTEGER}
		where id = #{id,jdbcType=INTEGER}
	</update>



</mapper>

/*
Navicat MySQL Data Transfer

Source Server         : 127.0.0.1
Source Server Version : 50515
Source Host           : 127.0.0.1:3306
Source Database       : sm

Target Server Type    : MYSQL
Target Server Version : 50515
File Encoding         : 65001

Date: 2016-07-01 14:05:54
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for type
-- ----------------------------
DROP TABLE IF EXISTS `type`;
CREATE TABLE `type` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `type` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of type
-- ----------------------------
INSERT INTO `type` VALUES ('1', '老师');
INSERT INTO `type` VALUES ('2', '教授');

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  `typeid` varchar(100) DEFAULT NULL COMMENT '类型',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', '周伯通', '123456', '99', '1');
INSERT INTO `user` VALUES ('2', '瑛姑', 'user', '89', '2');

八、项目用到的jar和maven的配置

	.m2\repository\junit\junit\4.11\junit-4.11.jar
	.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar
	.m2\repository\javax\javaee-api\7.0\javaee-api-7.0.jar
	.m2\repository\com\sun\mail\javax.mail\1.5.0\javax.mail-1.5.0.jar
	.m2\repository\javax\activation\activation\1.1\activation-1.1.jar
	.m2\repository\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar
	.m2\repository\org\springframework\spring-core\4.0.2.RELEASE\spring-core-4.0.2.RELEASE.jar
	.m2\repository\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar
	.m2\repository\org\springframework\spring-web\4.0.2.RELEASE\spring-web-4.0.2.RELEASE.jar
	.m2\repository\org\springframework\spring-beans\4.0.2.RELEASE\spring-beans-4.0.2.RELEASE.jar
	.m2\repository\org\springframework\spring-context\4.0.2.RELEASE\spring-context-4.0.2.RELEASE.jar
	.m2\repository\org\springframework\spring-oxm\4.0.2.RELEASE\spring-oxm-4.0.2.RELEASE.jar
	.m2\repository\org\springframework\spring-tx\4.0.2.RELEASE\spring-tx-4.0.2.RELEASE.jar
	.m2\repository\org\springframework\spring-jdbc\4.0.2.RELEASE\spring-jdbc-4.0.2.RELEASE.jar
	.m2\repository\org\springframework\spring-webmvc\4.0.2.RELEASE\spring-webmvc-4.0.2.RELEASE.jar
	.m2\repository\org\springframework\spring-expression\4.0.2.RELEASE\spring-expression-4.0.2.RELEASE.jar
	.m2\repository\org\springframework\spring-aop\4.0.2.RELEASE\spring-aop-4.0.2.RELEASE.jar
	.m2\repository\aopalliance\aopalliance\1.0\aopalliance-1.0.jar
	.m2\repository\org\springframework\spring-context-support\4.0.2.RELEASE\spring-context-support-4.0.2.RELEASE.jar
	.m2\repository\org\springframework\spring-test\4.0.2.RELEASE\spring-test-4.0.2.RELEASE.jar
	.m2\repository\org\mybatis\mybatis\3.2.6\mybatis-3.2.6.jar
	.m2\repository\org\mybatis\mybatis-spring\1.2.2\mybatis-spring-1.2.2.jar
	.m2\repository\mysql\mysql-connector-java\5.1.30\mysql-connector-java-5.1.30.jar
	.m2\repository\commons-dbcp\commons-dbcp\1.2.2\commons-dbcp-1.2.2.jar
	.m2\repository\commons-pool\commons-pool\1.3\commons-pool-1.3.jar
	.m2\repository\jstl\jstl\1.2\jstl-1.2.jar
	.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar
	.m2\repository\com\alibaba\fastjson\1.2.8\fastjson-1.2.8.jar
	.m2\repository\org\slf4j\slf4j-api\1.7.7\slf4j-api-1.7.7.jar
	.m2\repository\org\slf4j\slf4j-log4j12\1.7.7\slf4j-log4j12-1.7.7.jar
	.m2\repository\org\codehaus\jackson\jackson-mapper-asl\1.9.13\jackson-mapper-asl-1.9.13.jar
	.m2\repository\org\codehaus\jackson\jackson-core-asl\1.9.13\jackson-core-asl-1.9.13.jar
	.m2\repository\commons-fileupload\commons-fileupload\1.3.1\commons-fileupload-1.3.1.jar
	.m2\repository\commons-io\commons-io\2.4\commons-io-2.4.jar
	.m2\repository\commons-codec\commons-codec\1.9\commons-codec-1.9.jar
	.m2\repository\com\github\pagehelper\pagehelper\4.1.3\pagehelper-4.1.3.jar
	.m2\repository\com\github\jsqlparser\jsqlparser\0.9.5\jsqlparser-0.9.5.jar
	.m2\repository\com\alibaba\druid\1.0.18\druid-1.0.18.jar
	.m2\repository\org\jsoup\jsoup\1.9.2\jsoup-1.9.2.jar
	.m2\repository\org\apache\velocity\velocity\1.7\velocity-1.7.jar
	.m2\repository\commons-collections\commons-collections\3.2.1\commons-collections-3.2.1.jar
	.m2\repository\commons-lang\commons-lang\2.4\commons-lang-2.4.jar
	.m2\repository\org\aspectj\aspectjrt\1.8.9\aspectjrt-1.8.9.jar
	.m2\repository\org\aspectj\aspectjweaver\1.8.9\aspectjweaver-1.8.9.jar

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>sm</groupId>
	<artifactId>sm</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>M1 Maven Webapp</name>
	<url>http://maven.apache.org</url>

	<properties>
		<!-- spring版本号 -->
		<spring.version>4.0.2.RELEASE</spring.version>
		<!-- mybatis版本号 -->
		<mybatis.version>3.2.6</mybatis.version>
		<!-- log4j日志文件管理包版本 -->
		<slf4j.version>1.7.7</slf4j.version>
		<log4j.version>1.2.17</log4j.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>javax</groupId>
			<artifactId>javaee-api</artifactId>
			<version>7.0</version>
		</dependency>

		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
			<version>3.1</version>
		</dependency>

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.11</version>
			<!-- 表示开发的时候引入，发布的时候不会加载此包 -->
			<scope>test</scope>
		</dependency>
		<!-- spring核心包 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-oxm</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-tx</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aop</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<!-- mybatis核心包 -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>${mybatis.version}</version>
		</dependency>
		<!-- mybatis/spring包 -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.2.2</version>
		</dependency>
		<!-- 导入java ee jar 包 -->
		<dependency>
			<groupId>javax</groupId>
			<artifactId>javaee-api</artifactId>
			<version>7.0</version>
		</dependency>
		<!-- 导入Mysql数据库链接jar包 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.30</version>
		</dependency>
		<!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
		<dependency>
			<groupId>commons-dbcp</groupId>
			<artifactId>commons-dbcp</artifactId>
			<version>1.2.2</version>
		</dependency>
		<!-- JSTL标签类 -->
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
		<!-- 日志文件管理包 -->
		<!-- log start -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>${log4j.version}</version>
		</dependency>


		<!-- 格式化对象，方便输出日志 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.1.41</version>
		</dependency>


		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>${slf4j.version}</version>
		</dependency>

		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>${slf4j.version}</version>
		</dependency>
		<!-- log end -->
		<!-- 映入JSON -->
		<dependency>
			<groupId>org.codehaus.jackson</groupId>
			<artifactId>jackson-mapper-asl</artifactId>
			<version>1.9.13</version>
		</dependency>
		<!-- 上传组件包 -->
		<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>2.4</version>
		</dependency>
		<dependency>
			<groupId>commons-codec</groupId>
			<artifactId>commons-codec</artifactId>
			<version>1.9</version>
		</dependency>

		<dependency>
			<groupId>com.github.pagehelper</groupId>
			<artifactId>pagehelper</artifactId>
			<version>4.1.3</version>
		</dependency>
		<dependency>
			<groupId>com.github.jsqlparser</groupId>
			<artifactId>jsqlparser</artifactId>
			<version>0.9.5</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.8</version>
		</dependency>

		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.18</version>
		</dependency>
		
		<!-- https://mvnrepository.com/artifact/org.jsoup/jsoup -->
		<dependency>
			<groupId>org.jsoup</groupId>
			<artifactId>jsoup</artifactId>
			<version>1.9.2</version>
		</dependency>

		<dependency>
			<groupId>org.apache.velocity</groupId>
			<artifactId>velocity</artifactId>
			<version>1.7</version>
		</dependency>

			<!-- 切面 -->
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjrt</artifactId>
			<version>1.8.9</version>
		</dependency>
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>1.8.9</version>
		</dependency>
			
				<!-- https://mvnrepository.com/artifact/jstl/jstl -->
		<dependency>
		    <groupId>jstl</groupId>
		    <artifactId>jstl</artifactId>
		    <version>1.2</version>
		</dependency>
					
	</dependencies>

	<build>
		<finalName>sm</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-war-plugin</artifactId>
				<version>2.6</version>
				<configuration>
					<failOnMissingWebXml>false</failOnMissingWebXml>
				</configuration>
			</plugin>
		</plugins>
	</build>



</project>

九、Mybatis的The SQL Builder Class的使用Service层

package com.flong.service.impl;

import java.util.List;
import java.util.Map;

import org.apache.ibatis.jdbc.SQL;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.flong.BaseService;
import com.flong.dao.UserMapper;
import com.flong.pojo.entity.User;
import com.flong.pojo.vo.UserVo;
import com.flong.service.UserService;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageInfo;

@Service
public class UserServiceImpl extends BaseService  implements UserService {

	@Autowired
	private UserMapper userMapper;

	
	
	public User getUserById(int id) {
		System.out.println(id + this.userMapper.selectId(id).getUsername());
		return this.userMapper.selectId(id);
	}

	public Boolean getLoginUser(User userLogin) {
		if (userLogin.getUsername().equals("") || (userLogin.getPassword().equals(""))) {
			return false;
		} else {

			User user = new User();
			if (this.userMapper.selectLogin(userLogin.getUsername()) != null) {
				user = userMapper.selectLogin(userLogin.getUsername());
				if (user.toString().isEmpty()) {
					return false;
				} else {
					if (user.getPassword().equals(userLogin.getPassword())) {
						return true;
					} else {
						return false;
					}
				}
			} else {
				return false;
			}
		}
	}

	public User user(User user) {
		return null;
	}

	public User selectLogin(String username) {
		return this.userMapper.selectLogin(username);
	}

	public User selectByPrimaryKey(int i) {
		return this.userMapper.selectByPrimaryKey(i);
	}

	public User getUserByusername(String username) {
		return this.userMapper.selectLogin(username);
	}

	public int inster(User user) {
		int i = this.userMapper.insert(user);
		return i;
	}

	public List<User> list() {
		return userMapper.list();
	}

	
	
	
	/****
	 * ==============================================================通过The SQL Builder Class编写SQL进行操作数据库==================================
	 * 
	 * http://www.mybatis.org/mybatis-3/index.html
	 * @param id
	 * @return
	 */
	
	public String listBySQL() {
		 return new SQL(){
	        {
	        	 SELECT(" A.id,A.username,A.password ,B.type ")//SELECT关键字
	        	 .FROM(" user A ")//FROM关键字
	        	 .LEFT_OUTER_JOIN(" type B  on A.typeid=B.id");  //左连接
	                 
	        }}.toString();
	 
	}
	
	/**
	 * 
	 * @param user 这个是vo传值.#的字段要和vo实体一致才可以能获取到值.
	 * @return
	 */
	
	public String insertBySQL(UserVo user) {
		String sql = new SQL() 
					.INSERT_INTO("user")
				    .VALUES("username, password ,typeid,age", "#{username}, #{password},#{type},#{age}")
				    .toString();
		  return sql;
		
	}
	
	
	public String updateBySQL(UserVo user) {
		 return new SQL() {{
			    UPDATE("user");
			    SET("username = #{username}");
			    WHERE("id = #{id}");
		 }}.toString();
		
	}
	
	
	public String deleteSql(String id) {
		  return new SQL() {{
		    DELETE_FROM("user");
		    WHERE("ID = #{id}");
		  }}.toString();
	}

	
	
	
	/****
	 * ==============================================================整合pagehelper分页==================================
	 * 
	 * @param id
	 * @return
	 */
	public PageInfo<?> query(Map<String, Object> params) {
		
		this.startPage(params);
		Page<User> list = userMapper.query(params);
		return new PageInfo<User>(list);
		
		
	}


}

十、Mybatis的The SQL Builder Class的使用Dao层

package com.flong.dao;

import java.util.List;
import java.util.Map;

import org.apache.ibatis.annotations.SelectProvider;

import com.flong.pojo.entity.User;
import com.flong.pojo.vo.UserVo;
import com.flong.service.impl.UserServiceImpl;
import com.github.pagehelper.Page;

public interface UserMapper {
	/****
	 * ==============================================================通过xml进行操作数据库==============================================================
	 * @param id
	 * @return
	 */
	
	
    int deleteByPrimaryKey(Integer id);

    int insert(User record);

    int insertSelective(User record);

    User selectByPrimaryKey(Integer id);

    int updateByPrimaryKeySelective(User record);

    int updateByPrimaryKey(User record);
    
    User selectId(int id);

	User selectLogin(String username);

	List<User> list();
	
	
	
	/****
	 * ==============================================================通过注解和Java编写SQL进行操作数据库==============================================================
	 * @param id
	 * @return
	 */
	
	

	/**
	 * 通过mybatis的SQL方法进行查询，无xml配置的出来
	 * 告诉method = "listBySQL"方法的提供方，是来原于UserServiceImpl这个实现类里面获取的。
	 * List<UserVo>这个UserVo相当于是Vo
	 */
	@SelectProvider(type = UserServiceImpl.class, method = "listBySQL")
	List<UserVo> listBySQL();
	
	
	/**
	 * 插入
	 * @param user
	 * @return
	 */
	
	@SelectProvider(type = UserServiceImpl.class, method = "insertBySQL")
	String insertBySQL(UserVo user);
	 
	
	/**
	 * 修改
	 * @param user
	 * @return
	 */
	@SelectProvider(type = UserServiceImpl.class, method = "updateBySQL")
	String updateBySQL(UserVo user);
	
	/**
	 * 删除
	 * @param id
	 * @return
	 */
	@SelectProvider(type = UserServiceImpl.class, method = "deleteSql")
	String deleteSql(String id);

	
	
	
	Page<User> query(Map<String, Object> params);
	 
	
	
}

十一、spring的控制层

package com.flong.controller;

import java.util.List;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.flong.BaseController;
import com.flong.pojo.entity.User;
import com.flong.service.UserService;

@Controller
@RequestMapping("/user")
public class UserController extends BaseController{
	
	@Resource
	private UserService userService;
	
	
	
	/**
	 * 
	 * @param request
	 * @param model
	 */
	@RequestMapping(value="/list", method = {RequestMethod.POST,RequestMethod.GET})
	public void list(HttpServletRequest request,HttpServletResponse response,Model model){
		List<User> list=userService.list();
		writeJson(list, response);
		
	}
	
	/**
	 * @param request
	 * @param model
	 * @return
	 */
	@RequestMapping(value="/register",method = {RequestMethod.POST,RequestMethod.GET})
	public String registerIndex(HttpServletRequest request,Model model){
		User user = new User();  
		user.setUsername("张三");  
		user.setPassword("123466");  
		user.setAge(45);  			
		user.setTypeid("2");
		this.userService.inster(user);
      
	    return "index";
	}
	

	
	
}

package com.flong.controller;



import java.util.List;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.flong.BaseController;
import com.flong.dao.UserMapper;
import com.flong.pojo.vo.UserVo;



@Controller
@RequestMapping("/user2")
public class UserController2 extends BaseController{
 
	
	@Resource
	private UserMapper userMapper;
	
	/**
	 * 查询
	 * @param request
	 * @param response
	 * @param model
	 */
	@RequestMapping(value="/listBySQL", method = {RequestMethod.POST,RequestMethod.GET})
	public void listBySQL(HttpServletRequest request,HttpServletResponse response,Model model){
		List<UserVo> list=userMapper.listBySQL();
		writeJson(list, response);
	}
	
	
	
	/**
	 * 插入
	 * @param request
	 * @param response
	 * @param model
	 */
	@RequestMapping(value="/insertBySQL", method = {RequestMethod.POST,RequestMethod.GET})
	public void insertBySQL(HttpServletRequest request,HttpServletResponse response,Model model){
		
		UserVo user = new UserVo();  
		user.setUsername("张三");  
		user.setPassword("123466");  
		user.setAge(45);  			
		user.setType("2");
		
		userMapper.insertBySQL(user);
		
		writeJson(user, response);
	}
	
	/**
	 * 修改
	 * @param request
	 * @param response
	 * @param model
	 */
	@RequestMapping(value="/updateBySQL", method = {RequestMethod.POST,RequestMethod.GET})
	public void updateBySQL(HttpServletRequest request,HttpServletResponse response,Model model){
		UserVo user = new UserVo();  
		user.setUsername("周伯通");  
		user.setId(1);
		userMapper.updateBySQL(user);
		writeJson(user, response);
	}
	
	
	/**
	 * 删除
	 * @param request
	 * @param response
	 * @param model
	 */
	@RequestMapping(value="/deleteSql", method = {RequestMethod.POST,RequestMethod.GET})
	public void deleteSql(HttpServletRequest request,HttpServletResponse response,Model model){
		 String deleteSql = userMapper.deleteSql("1");
		 writeJson(deleteSql, response);
	}
	
	 
	
	
	
}

十二、利用AbstractRoutingDataSource实现动态数据源切换

package com.flong.utils.persistence;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

/** 
 * 
 * 利用AbstractRoutingDataSource实现动态数据源切换
 * spring2.0以后增加了AbstractRoutingDataSource
 * 自定义一个类继承AbstractRoutingDataSource，重构一个setMethodType支持自定义开头的方法
 * 进行使用数据源的操作数据库
 */
public class DynamicChooseDataSource extends AbstractRoutingDataSource {
	public static Map<String, List<String>> METHODTYPE = new HashMap<String, List<String>>();

	/**
	 *  获取数据源名称
	 */
	protected Object determineCurrentLookupKey() {
		return HandleDataSource.getDataSource();
	}

	/**
	 *  设置方法名前缀对应的数据源
	 * @param map
	 */
	public void setMethodType(Map<String, String> map) {
		for (String key : map.keySet()) {
			List<String> v = new ArrayList<String>();
			String[] types = map.get(key).split(",");
			for (String type : types) {
				if (StringUtils.isNotBlank(type)) {
					v.add(type);
				}
			}
			METHODTYPE.put(key, v);
		}
	}
}

package com.flong.utils.persistence;

import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.stereotype.Component;

/**
 * 切换数据源(不同方法调用不同数据源)
 */
@Aspect
@Component
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class DataSourceAspect {
   private static Logger logger =Logger.getLogger(DataSourceAspect.class);

	@Pointcut("execution(* com.flong.*.dao.*.*(..))")
	public void aspect() {
	}

	/**
	 * 配置前置通知,使用在方法aspect()上注册的切入点
	 */
	@Before("aspect()")
	public void before(JoinPoint point) {
		String className = point.getTarget().getClass().getName();
		String method = point.getSignature().getName();
		logger.info(className + "." + method + "(" + StringUtils.join(point.getArgs(), ",") + ")");
		try {
			for (String key : DynamicChooseDataSource.METHODTYPE.keySet()) {
				for (String type : DynamicChooseDataSource.METHODTYPE.get(key)) {
					if (method.startsWith(type)) {
						HandleDataSource.putDataSource(key);
					}
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

package com.flong.utils.persistence;

public class HandleDataSource {
	/***
	 * 数据源名称线程池
	 */
	private static final ThreadLocal<String> holder = new ThreadLocal<String>();

	public static void putDataSource(String datasource) {
		holder.set(datasource);
	}

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

十三、源代码和图解

http://download.youkuaiyun.com/detail/l_ji_l/9570154