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Java环境中MyBatis与Spring或Spring MVC框架的集成方法

2019年07月22日  | 移动技术网IT编程  | 我要评论

与spring3集成
spring作为基础框架，可以集成后端框架，如hibernate，mybatis等。

前面是介绍单独使用mybatis的，大致逻辑是：
sqlsessionfactory <- configuration file (包括数据库连接配置)
ixxxmapper <- sqlsession <- sqlsessionfactory
                     <- mapper interface <- mapper xml
得到ixxmapper后，就可以调用其方法进行数据交互了。

和spring集成时，上面的这些对象需要作为bean来管理：
datasource bean <- 数据库连接配置
sqlsessionfactory bean <- datasource
                                     <- configuration file
usermapper bean <- sqlsessionfactory
                          <- mapper interface
1. 在pom.xml中加入依赖： 

<properties> 
 <mybatis.spring.version>1.2.1</mybatis.spring.version> 
 <dbcp.version>1.4</dbcp.version> 
 <spring.version>3.1.2.release</spring.version> 
</properties> 
 
<dependencies> 
 <dependency><!-- mybatis的几个对象包装成spring的bean --> 
  <groupid>org.mybatis</groupid> 
  <artifactid>mybatis-spring</artifactid> 
  <version>${mybatis.spring.version}</version> 
 </dependency> 
 <dependency><!-- spring上下文用spring-jdbc连接数据库 --> 
  <groupid>org.springframework</groupid> 
  <artifactid>spring-jdbc</artifactid> 
  <version>${spring.version}</version> 
 </dependency> 
 <dependency><!-- datasource是basicdatasource的实例 --> 
  <groupid>commons-dbcp</groupid> 
  <artifactid>commons-dbcp</artifactid> 
  <version>${dbcp.version}</version> 
 </dependency> 
 <dependency> 
  <groupid>org.springframework</groupid> 
  <artifactid>spring-test</artifactid> 
  <version>${spring.version}</version> 
 </dependency> 
</dependencies>

2. 在类路径下创建beans-da.xml文件： 

<?xml version="1.0" encoding="utf-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
 xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" 
 xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> 
 
 <bean id="datasource" class="org.apache.commons.dbcp.basicdatasource"><!-- 数据库连接bean --> 
  <property name="driverclassname" value="com.mysql.jdbc.driver" /> 
  <property name="url" value="jdbc:mysql://localhost:3306/hbatis?characterencoding=utf8" /> 
  <property name="username" value="root" /> 
  <property name="password" value="123456" /> 
 </bean> 
  
 <bean id="sqlsessionfactory" class="org.mybatis.spring.sqlsessionfactorybean"><!-- sqlsessionfactory bean --> 
  <property name="datasource" ref="datasource" /><!-- 数据源 --> 
  <property name="configlocation" value="classpath:configuration.xml" /><!-- 配置文件 --> 
 </bean> 
  
 <bean id="usermapper" class="org.mybatis.spring.mapper.mapperfactorybean"><!-- user映射bean--> 
  <property name="sqlsessionfactory" ref="sqlsessionfactory" /> 
  <property name="mapperinterface" value="com.john.hbatis.mapper.iusermapper" /><!-- 映射接口 --> 
 </bean> 
</beans>

3. 测试类： 

@contextconfiguration(locations = { "classpath:beans-da.xml" }) 
public class springintegrationtest extends abstracttestngspringcontexttests { 
  private static final logger log = loggerfactory.getlogger(springintegrationtest.class); 
   
  @resource 
  iusermapper mapper; 
   
  @test 
  public void querytest() { 
    user user = mapper.getuserbyid(1); 
    log.info("name: {}, address: {}", user.getname(), user.getaddress()); 
  } 
}

与springmvc集成
这里我们建立在与spring3集成基础上来讲：
1. 往pom.xml添加springmvc和freemarker依赖： 

<properties> 
 <freemarker.version>2.3.19</freemarker.version> 
 <servlet.version>2.5</servlet.version> 
</properties> 
 
<dependency>  
 <groupid>org.freemarker</groupid>  
 <artifactid>freemarker</artifactid>  
 <version>${freemarker.version}</version>  
</dependency> 
<dependency> 
 <groupid>javax.servlet</groupid>  
 <artifactid>servlet-api</artifactid>  
 <version>${servlet.version}</version> 
 <scope>provided</scope> 
</dependency>

2. 在web.xml中加入spring的监听器和springmvc的servlet： 

<listener> 
 <listener-class>org.springframework.web.context.contextloaderlistener</listener-class><!-- 监听容器事件，初始化和关闭web应用上下文并调用contextcleanuplistener清理资源 --> 
</listener> 
<listener> 
 <listener-class>org.springframework.web.context.contextcleanuplistener</listener-class><!-- web应用关闭时，清理servletcontext中spring相关的可销毁资源 --> 
</listener> 
 
<servlet> 
 <servlet-name>hbatis</servlet-name> 
 <servlet-class>org.springframework.web.servlet.dispatcherservlet</servlet-class> 
 <!--<init-param> 
  <param-name>contextconfiglocation</param-name> 
  <param-value>/web-inf/hbatis-servlet.xml</param-value> 
 </init-param>--><!-- 未配置时，springmvc会到web-inf目录下找${project.name}-servlet.xml --> 
 <load-on-startup>1</load-on-startup> 
</servlet> 
<servlet-mapping> 
 <servlet-name>hbatis</servlet-name> 
 <url-pattern>*.htm</url-pattern> 
</servlet-mapping>

3. 在web-inf下新建：

spring配置文件applicationcontext.xml：

<?xml version="1.0" encoding="utf-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
 xmlns:p="http://www.springframework.org/schema/p" 
 xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" 
 xmlns:context="http://www.springframework.org/schema/context" 
 xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> 
 
 <context:property-placeholder location="classpath:/database.properties" /><!-- 数据库配置文件 --> 
 
 <bean id="datasource" class="org.apache.commons.dbcp.basicdatasource" 
  p:driverclassname="${driverclassname}" 
  p:url="${url}" 
  p:username="${user_name}" 
  p:password="${password}" /><!-- 数据源配置 --> 
  
 <bean id="sqlsessionfactory" class="org.mybatis.spring.sqlsessionfactorybean"><!-- sqlsessionfactory对象 --> 
  <property name="datasource" ref="datasource" /><!-- 数据源 --> 
  <property name="configlocation" value="classpath:configuration.xml" /><!-- mybatis配置文件 --> 
  <!--<property name="mapperlocations" value="classpath*:com/john/hbatis/model/*.xml" />--><!-- 可以在configuration.xml或此处配置映射文件，但其中不能有相同id的parametermap, resultmap或sql等 --> 
 </bean> 
  
 <bean id="mapperconfigurer" class="org.mybatis.spring.mapper.mapperscannerconfigurer"><!-- 扫描指定包以获取映射器 --> 
  <property name="basepackage" value="com.john.hbatis.mapper" /> 
 </bean> 
</beans>

类路径下的database.properties：

driverclassname=com.mysql.jdbc.driver 
url=jdbc:mysql://localhost:3306/mybatis?characterencoding=utf8 
user_name=root 
password=123456


注：因为mapperscannerconfigurer可能会导致username取的是系统用户的账号，而造成数据库连接失败，所以改成其它值：user_name。

springmvc配置文件hbatis-servlet.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: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.xsd 
 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd 
 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> 
 
 <mvc:annotation-driven /><!-- 注册requestmappinghandlermapping, requestmappinghandleradapter和exceptionhandlerexceptionresolver以提供对@requestmapping,@exceptionhandler等注解的支持 --> 
 
 <context:component-scan base-package="com.john.hbatis.controller" /><!-- 扫描控制器包下有特定注解的类，并实例化和依赖注入 --> 
 
 <!-- freemarker视图处理器 --> 
 <bean id="viewresolverftl" class="org.springframework.web.servlet.view.freemarker.freemarkerviewresolver">  
  <property name="viewclass" value="org.springframework.web.servlet.view.freemarker.freemarkerview"/>  
  <property name="contenttype" value="text/html;charset=utf-8"/>  
  <property name="prefix" value="" />  
  <property name="cache" value="false"/>  
  <property name="viewnames">  
    <array>  
      <value>*.ftl</value>  
    </array>  
  </property>  
  <!--<property name="suffix" value=".ftl"/>-->  
  <property name="order" value="0"/><!-- 优先级，数值越小优先级越高 -->  
 </bean> 
 
 <bean id="freemarkerconfig" class="org.springframework.web.servlet.view.freemarker.freemarkerconfigurer">  
  <property name="templateloaderpaths">  
    <list>  
      <value>/web-inf/ftl/</value><!-- 模板加载路径 -->  
    </list>  
  </property>  
 </bean> 
</beans>

4. mvc：
控制层：usercontroller.java

@controller 
@requestmapping("/article") 
public class usercontroller { 
 
  @autowired 
  iusermapper mapper; 
 
  @requestmapping("/list") 
  public string showall(modelmap modelmap) { 
    list<article> articles = mapper.getarticlesbyuserid(1); 
    modelmap.addattribute("articles", articles); 
    return "main.ftl"; 
  } 
}

视图层：main.ftl:

<#list articles as article> 
  <div>${article.id}. ${article.title}: ${article.content}</div> 
</#list>

5. 启动工程，浏览器输入：http://localhost:8080/hbatis/article/list.htm查看结果。

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