spring-mybatis项目搭建（支持多数据源）

一、目录结构图

2、配置文件内容

db.properties：

#oracle public
oracle.driverClass=oracle.jdbc.driver.OracleDriver
oracle.maxActive=14
oracle.initialSize=1
oracle.maxWait=120
oracle.maxIdle=14
oracle.minIdle=1
oracle.removeAbandoned=true
oracle.removeAbandonedTimeout=180
oracle.timeBetweenEvictionRunsMillis=60000
oracle.minEvictableIdleTimeMillis=1800000
oracle.connectionProperties=bigStringTryClob=true;clientEncoding=UTF-8;defaultRowPrefetch=50;serverEncoding=UTF-8

#oracle DB  注：oracle和mysql只是driverClass不一样，其他配置相同
oracle.jdbc.url=jdbc:oracle:thin:@127.0.0.1:1521:ORCL
oracle.jdbc.username=crh_snp
oracle.jdbc.passpword=cairenhui

freemarker.properties:

#freemarker settings
tag_syntax=auto_detect
template_update_delay=2
default_encoding=UTF-8
output_encoding=UTF-8
locale=zh_CN
date_format=yyyy-MM-dd
time_format=HH:mm:ss
datetime_format=yyyy-MM-dd HH:mm:ss

3、web.xml配置

<?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">

    <welcome-file-list>
        <welcome-file>page/index.html</welcome-file>
        <welcome-file>page/index.htm</welcome-file>
        <welcome-file>page/index.jsp</welcome-file>
    </welcome-file-list>

    <!-- 加载日志配置文件 -->
    <context-param>
        <param-name>log4jConfigLocation</param-name>
       <param-value>classpath:/config/log4j.properties</param-value>
    </context-param>
    <!-- 加载配置文件 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            classpath:/datasource/dbconfig.xml
        </param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 对客户端请求的静态资源如图片、JS文件等的请求交由默认的servlet进行处理 ,必须写在DispatcherServlet前面，否则会被spring拦截 -->
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.css</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.gif</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.jpg</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.js</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.png</url-pattern>
    </servlet-mapping> 

    <servlet>
        <servlet-name>config</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/config-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
        <async-supported>true</async-supported>
    </servlet>

    <servlet-mapping>
        <servlet-name>config</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>config</servlet-name>
        <url-pattern>*.htm</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>config</servlet-name>
        <url-pattern>*.img</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>config</servlet-name>
        <url-pattern>*.json</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>config</servlet-name>
        <url-pattern>*.ws</url-pattern>
    </servlet-mapping>

    <!-- 统一工程编码过滤器 -->
    <filter>
        <filter-name>encodingFilter</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>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <error-page>
        <error-code>404</error-code>
        <location>/404.htm</location>
    </error-page>
    <error-page>
        <error-code>500</error-code>
        <location>/500.htm</location>
    </error-page>
</web-app>

4、dbconfig.xml（数据库连接配置）

<?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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">  

    <!-- 引入db.properties中属性 -->
    <!-- 方式一 ：单文件引入-->
    <!-- <bean id="placeholderConfig"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location">
            <value>classpath:/config/db.properties</value>
        </property>
    </bean> -->
    <!-- 方式二：多文件引入 -->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="order" value="2" />
        <property name="ignoreUnresolvablePlaceholders" value="true" />
        <property name="locations">
            <list>
                <value>classpath:config/freemarker.properties</value>
                <value>classpath:config/db.properties</value>
                <!-- 注意路径写法，上面写法要加classpath，路径前不能有/，此下面写法 -->
                <value>/WEB-INF/test.properties</value>
            </list>
        </property>
    </bean>
    <bean id="dataSource" name="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${oracle.driverClass}" />
        <property name="url" value="${oracle.jdbc.url}" />
        <property name="username" value="${oracle.jdbc.username}" />
        <property name="password" value="${oracle.jdbc.passpword}" />
        <!-- 连接池最大使用连接数量 -->
        <property name="maxActive" value="${oracle.maxActive}" />
        <!-- 获取连接最大等待时间 -->
        <property name="maxWait" value="${oracle.maxWait}" />
        <property name="poolPreparedStatements" value="true" />
        <property name="defaultAutoCommit" value="true" />
        <!-- 连接池最大空闲 -->
        <property name="maxIdle" value="${oracle.maxIdle}" />
        <!-- 连接池最小空闲 -->
        <property name="minIdle" value="${oracle.minIdle}" />
        <property name="testOnBorrow" value="true" />
        <property name="testWhileIdle" value="true" />
        <property name="validationQuery" value="select 1 from dual" />
        <!-- 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="${oracle.timeBetweenEvictionRunsMillis}" />
        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="${oracle.minEvictableIdleTimeMillis}" />
    </bean>

    <!-- 配置mybatis固定的写法 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation">
            <value>classpath:mybatis/mybatis-sqlmap.xml</value>
        </property>
    </bean>

    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
    </bean>

    <!-- 配置事务管理器bean -->
    <!-- TransactionManager -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource">
            <ref local="dataSource" />
        </property>
    </bean>  

    <bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
        <property name="transactionManager">
            <ref bean="transactionManager"/>
        </property>
    </bean>  

    <!-- 事务控制代理抽象定义 -->
    <bean id="transactionProxy"
        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
        abstract="true">
        <!-- 为事务代理bean注入一个事物管理器 -->
        <property name="transactionManager">
            <ref bean="transactionManager" />
        </property>
        <!-- 定义事务传播属性 -->
        <property name="transactionAttributes">
            <props>
                <prop key="add*">PROPAGATION_REQUIRED</prop>
                <prop key="release*">PROPAGATION_REQUIRED</prop>
                <prop key="delete*">PROPAGATION_REQUIRED</prop>
                <prop key="update*">PROPAGATION_REQUIRED</prop>
                <prop key="find*">PROPAGATION_REQUIRED</prop>
                <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
            </props>
        </property>
    </bean>  

</beans>

5、mybatis-sqlmap.xml配置

<?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="cacheEnabled" value="true"/>
      <setting name="lazyLoadingEnabled" value="true"/>
      <setting name="multipleResultSetsEnabled" value="true"/>
      <setting name="useColumnLabel" value="true"/>
      <setting name="useGeneratedKeys" value="false"/>
      <setting name="autoMappingBehavior" value="PARTIAL"/>
      <setting name="defaultExecutorType" value="SIMPLE"/>
      <setting name="defaultStatementTimeout" value="25"/>
      <setting name="safeRowBoundsEnabled" value="false"/>
      <setting name="mapUnderscoreToCamelCase" value="false"/>
      <setting name="localCacheScope" value="SESSION"/>
      <setting name="jdbcTypeForNull" value="OTHER"/>
      <setting name="lazyLoadTriggerMethods" value="equals,clone,hashCode,toString"/>
  </settings>
  <!-- 此配置是为bean起别名，有此配置后可在sql的xml文件中直接使用别名代替bean的全路径，如：resultType="User"，所起别名不区分大小写 -->
  <typeAliases>
      <package name="com.test.model"/>
  </typeAliases>

    <mappers>
        <!-- sql文件配置方式一：指定文件路径位置，sql.xml文件namespace可以直接用dao名称，注意此时sql.xml文件要在resource目录下 -->
        <!-- <mapper resource="mybatis/sqlmap/user/user.xml"/> -->
        <!-- sql文件配置方式二：sql文件和dao接口放在同一个目录下，只需要配置sql.xml文件和接口所在包路径 ，但是sql。xml的namespace要是dao接口的完整路径-->
        <package name="com.test.web.dao"/>
    </mappers>
</configuration>

6、brokerDao.xml文件配置（sql.xml）

<?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.test.web.dao.broker.BrokerDao">
    <resultMap type="brokerInfo" id="brokerResultMap">
        <result property="user_id" column="user_id"/>
        <result property="organ_flag" column="organ_flag"/>
        <result property="user_name" column="user_name"/>
    </resultMap>

    <select id="selectBroker" resultMap="brokerResultMap" parameterType="java.lang.String">
        SELECT * FROM crh_user.brokerinfo WHERE user_id = #{user_id}
    </select>

</mapper>

7、java代码

TestController:

@Controller
@RequestMapping("test")
public class TestController {

    @Autowired
    TestService testService;

    @RequestMapping("print")
    public ModelAndView testController(HttpServletRequest req, HttpServletResponse resp, ModelAndView mav, String testId){
        System.out.println("*****************controller come in******************");
        mav.setViewName("index");

        testService.testMethod();

        return mav;
    }

}

TestServiceImpl:

@Service
public class TestServiceImpl implements TestService {

    @Autowired
    BrokerDao brokerDao;

    public void testMethod() {
        System.out.println("***********test service method *******");
        brokerDao.testBroker();
        System.out.println("***********test service end*********");
    }

}

BrokerDaoImpl:

@Repository
public class BrokerDaoImpl implements BrokerDao {

    @Autowired
    private SqlSessionTemplate sqlSession; 

    public void testBroker() {
        String user_id = "100020";
        Brokerinfo broker = (Brokerinfo)sqlSession.selectOne("com.test.web.dao.broker.BrokerDao.selectBroker", user_id);
        System.out.println(broker);
    }
}