1、基本概念
1.1、Spring
Spring是一個開源框架，Spring是於2003 年興起的一個輕量級的Java 開發框架，由Rod Johnson 在其著作Expert One-On-One J2EE Development and Design中闡述的部分理念和原型衍生而來。它是為了解決企業應用開發的復雜性而創建的。Spring使用基本的JavaBean來完成以前只可能由EJB完成的事情。然而，Spring的用途不僅限於服務器端的開發。從簡單性、可測試性和松耦合的角度而言，任何Java應用都可以從Spring中受益。 簡單來說，Spring是一個輕量級的控制反轉（IoC）和面向切面（AOP）的容器框架。
1.2、SpringMVC
Spring MVC屬於SpringFrameWork的后續產品，已經融合在Spring Web Flow里面。Spring MVC 分離了控制器、模型對象、分派器以及處理程序對象的角色，這種分離讓它們更容易進行定制。
1.3、MyBatis
MyBatis 本是apache的一個開源項目iBatis, 2010年這個項目由apache software foundation 遷移到了google code，並且改名為MyBatis 。MyBatis是一個基於Java的持久層框架。iBATIS提供的持久層框架包括SQL Maps和Data Access Objects（DAO）MyBatis 消除了幾乎所有的JDBC代碼和參數的手工設置以及結果集的檢索。MyBatis 使用簡單的 XML或注解用於配置和原始映射，將接口和 Java 的POJOs（Plain Old Java Objects，普通的 Java對象）映射成數據庫中的記錄。
2、開發環境
開發環境需要搭建maven，這里就不介紹了
maven項目的步驟：
1. 新建一個maven項目 點擊： File-new-maven project
直接點擊下一步：
選擇必須的maven -webapp 選擇以后，點擊下一步
然后寫好Group id 和 Artifact id，點擊finish
注意：剛建好的項目是不完整的，所以還要進行如下操作
然后我們，右鍵項目--->Properties
修改編碼字符集。和jdk版本 然后項目會變成如下：
這就完成了，整個項目的搭建。下面就是引入包的配置。
搭建ssm項目
4、SSM整合
4.1 修改web.xml文件
文件配置如下
<?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>
<!-- 編碼過濾器 -->
<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>
<!-- Spring監聽器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 防止Spring內存溢出監聽器 -->
<listener>
<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
</listener>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>/resources/*</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>
<description>
</description>
<display-name>FileUploadServlet</display-name>
<servlet-name>FileUploadServlet</servlet-name>
<servlet-class>am.controller.FileUploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<!-- 此處可以可以配置成*.do，對應struts的后綴習慣 -->
<url-pattern>/</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>FileUploadServlet</servlet-name>
<url-pattern>/FileUploadServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/index.jsp</welcome-file>
</welcome-file-list>
<!-- 配置SESSION超時，單位是分鍾 -->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
4.2 配置jdbc
將數據庫配置（jdbc.properties），日志配置（log4j.properties），spring-mvc配置（spring-mvc.xml），mybatis配置（spring-mybatis.xml）全部放在resources下面
jdbc配置如下：
driver=com.mysql.jdbc.Driver url=jdbc:mysql://112.74.51.37:3306/am?useUnicode=true&characterEncoding=utf-8&useSSL=false username=root password=tq2016 #定義初始連接數 initialSize=0 #定義最大連接數 maxActive=20 #定義最大空閑 maxIdle=20 #定義最小空閑 minIdle=1 #定義最長等待時間 maxWait=60000
4.3 配置log4j
#定義LOG輸出級別
log4j.rootLogger=INFO,Console,File
#定義日志輸出目的地為控制台
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#可以靈活地指定日志輸出格式，下面一行是指定具體的格式
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n
#文件大小到達指定尺寸的時候產生一個新的文件
log4j.appender.File = org.apache.log4j.RollingFileAppender
#指定輸出目錄
log4j.appender.File.File = logs/ssm.log
#定義文件最大大小
log4j.appender.File.MaxFileSize = 10MB
# 輸出所以日志，如果換成DEBUG表示輸出DEBUG以上級別日志
log4j.appender.File.Threshold = DEBUG
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n
4.4 配置spring-mvc
<?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:task="http://www.springframework.org/schema/task"
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-4.0.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.1.xsd">
<!-- <bean id="timer" class="com.entrym.cloud.utils.Timer"/>
<task:annotation-driven /> -->
<!-- 自動掃描該包，使SpringMVC認為包下用了@controller注解的類是控制器 -->
<context:component-scan base-package="com.entrym.cloud.controller" />
<!--避免IE執行AJAX時，返回JSON出現下載文件 -->
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
<mvc:resources mapping="/*.txt" location="/" cache-period="31556926" />
<mvc:annotation-driven/>
<!-- <mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/blog/xiaohuo/**"/>
<bean class="com.entrym.cloud.controller.BooksController" />
</mvc:interceptor>
</mvc:interceptors>
-->
<!-- 啟動SpringMVC的注解功能，完成請求和注解POJO的映射
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJacksonHttpMessageConverter" />
</list>
</property>
</bean>
-->
<!-- 定義跳轉的文件的前后綴 ，視圖模式配置-這里的配置我的理解是自動給后面action的方法return的字符串加上前綴和后綴，變成一個 可用的url地址-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/txt/" />
<property name="suffix" value=".txt" />
</bean>
<!-- 配置文件上傳，如果沒有使用文件上傳可以不用配置，當然如果不配，那么配置文件中也不必引入上傳組件包 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8" />
<!-- 文件大小最大值 -->
<property name="maxUploadSize" value="10485760000" />
<!-- 內存中的最大值 -->
<property name="maxInMemorySize" value="40960" />
</bean>
</beans>
4.5 配置spring-mybatis
<?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-4.0.xsd">
<!-- 自動掃描 -->
<context:component-scan base-package="com.entrym.cloud.*" />
<!-- 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">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
<!-- 初始化連接大小 -->
<property name="initialSize" value="${initialSize}"></property>
<!-- 連接池最大數量 -->
<property name="maxActive" value="${maxActive}"></property>
<!-- 連接池最大空閑 -->
<property name="maxIdle" value="${maxIdle}"></property>
<!-- 連接池最小空閑 -->
<property name="minIdle" value="${minIdle}"></property>
<!-- 獲取連接最大等待時間 -->
<property name="maxWait" value="${maxWait}"></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" />
<!-- 自動掃描mapping.xml文件 -->
<property name="mapperLocations" value="classpath:com/entrym/cloud/mappering/*.xml"></property>
</bean>
<!-- DAO接口所在包名，Spring會自動查找其下的類 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.entrym.cloud.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
<!-- (事務管理)transaction manager, use JtaTransactionManager for global tx -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
4.6 pom.xml配置
pom文件中引入dependency以后可以自動下載相關jar包
<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>hobby</groupId>
<artifactId>ssm</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>ssm Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<!-- spring版本號 -->
<spring.version>4.0.2.RELEASE</spring.version>
<!-- mybatis版本號 -->
<mybatis.version>3.1.1</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>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.15</version>
</dependency>
<dependency>
<groupId>com.belerweb</groupId>
<artifactId>pinyin4j</artifactId>
<version>2.5.0</version>
</dependency>
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.1</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<!-- 表示開發的時候引入，發布的時候不會加載此包 -->
<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>${mybatis.version}</version>
</dependency>
<!-- mybatis/spring包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.1.0</version>
</dependency>
<!-- 導入java ee jar 包 -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>
<!-- 導入Mysql數據庫鏈接jar包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.30</version>
</dependency>
<!-- 導入dbcp的jar包，用來在applicationContext.xml中配置數據庫 -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<!-- JSTL標簽類 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- 日志文件管理包 -->
<!-- log start -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<!-- 格式化對象，方便輸出日志 -->
<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>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.2</version>
</dependency>
<!-- 上傳組件包 -->
<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>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-email -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-email</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.6.2</version>
</dependency>
</dependencies>
<build>
<finalName>ssm</finalName>
</build>
</project>
需要注意的是：必須在main/java下面加這四個包，如果不加的話就把spring-mvc.xml和spring-mybatis.xml文件中的相關部分注釋掉，否則會報錯。
需加如下四個包
如果不加需要注釋掉spring-mvc.xml中
和spring-mybatis.xml中
這樣就OK了
5、接下來開始配置兩個數據源
5.1 將jdbc和mybatis文件各復制一份
jdbc就不多說了，和原版一樣，換一下數據庫就好了，如下
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/zizai?useUnicode=true&characterEncoding=utf-8 username=root password=root #aimo數據庫連接 #url=jdbc:mysql://112.74.51.37:3306/back?useUnicode=true&characterEncoding=utf-8 #username=root #password=tq2017 #定義初始連接數 initialSize=0 #定義最大連接數 maxActive=20 #定義最大空閑 maxIdle=20 #定義最小空閑 minIdle=1 #定義最長等待時間 maxWait=60000
5.2 配置spring-mybatis-back.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: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-4.0.xsd">
<!-- 自動掃描 -->
<context:component-scan base-package="com.entrym.cloud.back.*" />
<!-- 引入配置文件 -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc2.properties" />
</bean>
<bean id="dataSourceBack" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
<!-- 初始化連接大小 -->
<property name="initialSize" value="${initialSize}"></property>
<!-- 連接池最大數量 -->
<property name="maxActive" value="${maxActive}"></property>
<!-- 連接池最大空閑 -->
<property name="maxIdle" value="${maxIdle}"></property>
<!-- 連接池最小空閑 -->
<property name="minIdle" value="${minIdle}"></property>
<!-- 獲取連接最大等待時間 -->
<property name="maxWait" value="${maxWait}"></property>
</bean>
<!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
<bean id="sqlSessionFactoryBack" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSourceBack" />
<!-- 自動掃描mapping.xml文件 -->
<property name="mapperLocations" value="classpath:com/entrym/cloud/back/mapping/*.xml"></property>
</bean>
<!-- DAO接口所在包名，Spring會自動查找其下的類 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.entrym.cloud.back.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBack"></property>
</bean>
<!-- (事務管理)transaction manager, use JtaTransactionManager for global tx -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSourceBack" />
</bean>
</beans>
5.3 配置spring-mybatis-front.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- 自動掃描 -->
<context:component-scan base-package="com.entrym.cloud.front.*" />
<!-- 引入配置文件 -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties" />
</bean>
<bean id="dataSourceFront" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
<!-- 初始化連接大小 -->
<property name="initialSize" value="${initialSize}"></property>
<!-- 連接池最大數量 -->
<property name="maxActive" value="${maxActive}"></property>
<!-- 連接池最大空閑 -->
<property name="maxIdle" value="${maxIdle}"></property>
<!-- 連接池最小空閑 -->
<property name="minIdle" value="${minIdle}"></property>
<!-- 獲取連接最大等待時間 -->
<property name="maxWait" value="${maxWait}"></property>
</bean>
<!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
<bean id="sqlSessionFactoryFront" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSourceFront" />
<!-- 自動掃描mapping.xml文件 -->
<property name="mapperLocations" value="classpath:com/entrym/cloud/front/mapping/*.xml"></property>
</bean>
<!-- DAO接口所在包名，Spring會自動查找其下的類 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.entrym.cloud.front.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryFront"></property>
</bean>
<!-- (事務管理)transaction manager, use JtaTransactionManager for global tx -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSourceFront" />
</bean>
</beans>
5.4 配置web.xml
只需要在原來的基礎上多引入一個配置文件即可
<!-- Spring和mybatis的配置文件 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:spring-mybatis-front.xml,
classpath:spring-mybatis-back.xml
</param-value>
</context-param>
注意：
1、項目目錄最好分開寫
2、我配置好以后在項目啟動時不會報錯，但是調用方法時會報錯
嚴重: Servlet.service() for servlet [SpringMVC] in context with path [/twodatasource] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class '${driver}'
### The error may exist in file [D:\aimospace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\twodatasource\WEB-INF\classes\com\twodatasource\front\mapping\UserMapper.xml]
### The error may involve com.twodatasource.front.dao.UserMapper.selectAll
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class '${driver}'] with root cause
java.lang.ClassNotFoundException: ${driver}
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1332)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:260)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1130)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:80)
at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:66)
at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:279)
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:69)
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:56)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:141)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:101)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:95)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:355)
錯誤信息是加載不了{driver}
后來在配置文件中把它寫死了就可以了
<bean id="dataSourceFront" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://112.74.51.37:3306/front" />
<property name="username" value="root" />
<property name="password" value="tq2016" />
初始化連接大小
<property name="initialSize" value="${initialSize}"></property>
連接池最大數量
<property name="maxActive" value="${maxActive}"></property>
連接池最大空閑
<property name="maxIdle" value="${maxIdle}"></property>
連接池最小空閑
<property name="minIdle" value="${minIdle}"></property>
獲取連接最大等待時間
<property name="maxWait" value="${maxWait}"></property>
</bean>