SpringMVC4 + Spring + MyBatis3

SpringMVC4 + Spring + MyBatis3

本文使用最新版本(4.1.5)的springmvc+spring+mybatis,采用最间的配置方式来进行搭建。

1. web.xml

我们知道springmvc是基于Servlet: DispatcherServlet来处理分发请求的,所以我们需要先在web.xml文件中配置DispatcherServlet,而Spring的启动则是使用了监听器,所以需要配置spring的监听器:

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<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" 

    xmlns="http://java.sun.com/xml/ns/javaee" 

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 

        http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <display-name>sp</display-name>

  

  <servlet>

      <servlet-name>dispatcherServlet</servlet-name>

      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

      <load-on-startup>1</load-on-startup>

      <init-param>

          <param-name>contextConfigLocation</param-name>

          <param-value>classpath:config/spring-mvc.xml</param-value>

      </init-param>

  </servlet>

  <servlet-mapping>

      <servlet-name>dispatcherServlet</servlet-name>

      <url-pattern>/</url-pattern>

  </servlet-mapping>

  

  <listener>

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

  </listener>

  <context-param>

      <param-name>contextConfigLocation</param-name>

      <param-value>classpath:config/applicationContext.xml</param-value>

  </context-param>

  

</web-app>
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servlet下面的init-param中的指定了springmvc的dispatcherServlet的配置文件:config/spring-mvc.xml,所有springmvc相关的都在该文件中进行配置。在DispatcherServlet(其父类)中使用:getServletConfig().getInitParameter("paramName");  可以访问到init-param中指定的参数,从而可以读取到config/spring-mvc.xml文件。load-on-startup值为1指定了dispatcherServlet随servlet容器启动。

ContextLoaderListener是spring监听servlet容器的启动的,在servlet容器启动时,就初始化bean工厂,对bean进行初始化等等操作。context-param指定了spring的配置文件config/applicationContext.xml,可以使用: getServletContext().getInitParameter("paraName"); 读取到值。

注意:init-param 和 context-param 的区别,从名字上就可以看得出,后者是相对于整个web应用的,而前者是针对单个servlet的。

2. springmvc.xml

下面我们看一下springmvc.xml该如何配置:

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<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    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/mvc

        http://www.springframework.org/schema/mvc/spring-mvc.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd">

        

    <mvc:annotation-driven />

    <context:component-scan base-package="net.aazj.controller" />

     

     <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">

         <property name="prefix" value="/" />

         <property name="suffix" value=".jsp" />

     </bean>

     // ... ...

</beans>
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启用注解驱动来扫描controller,并指定control的包路径,还有指定了视图解析器,so easy。

3. applicationContext.xml

spring中相关bean扫描,事物的配置,以及和mybatis的结合配置如下所示:

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<?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:tx="http://www.springframework.org/schema/tx"

    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/tx

        http://www.springframework.org/schema/tx/spring-tx.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd">



    <context:component-scan base-package="net.aazj.service" />

    <!-- 引入属性文件 -->

    <context:property-placeholder location="classpath:config/db.properties" />

    

    <!-- 配置数据源 -->

    <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">

        <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="0" />

        <!-- 连接池最大使用连接数量 -->

        <property name="maxActive" value="20" />

        <!-- 连接池最大空闲 -->

        <property name="maxIdle" value="20" />

        <!-- 连接池最小空闲 -->

        <property name="minIdle" value="0" />

        <!-- 获取连接最大等待时间 -->

        <property name="maxWait" value="60000" />

    </bean>

    

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

      <property name="dataSource" ref="dataSource" />

      <property name="configLocation" value="classpath:config/mybatis-config.xml" />

      <property name="mapperLocations" value="classpath*:config/mappers/**/*.xml" />

    </bean>

    

    <!-- Transaction manager for a single JDBC DataSource -->

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

        <property name="dataSource" ref="dataSource" />

    </bean>

    

    <!-- 使用annotation定义事务 -->

    <tx:annotation-driven transaction-manager="transactionManager" /> 

    

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

      <property name="basePackage" value="net.aazj.mapper" />

    </bean>

</beans>
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同样相关service bean也使用基于注解的扫描方式:context:component-scan,事务也使用注解来驱动:tx:annotation-driven,所以需要在serviceImpl相关类上和方法上使用@Transanctional注解类配置事物。

sqlSessionFactory的配置相当重要,configLocation指定了mybatis的配置文件,如果需要在mybatis配置文件中配置比如<settings>, <typeAliases>, <mappers>则,需要在这里指定,如果不需要就没有必要指定值了。mapperLocations指定了mapper接口映射sql语句的xml文件的位置。MapperScannerConfigurer指定了mapper接口所在的包路径。

4. mybatis-config.xml

spring和mybatis的接口,其实可以不需要mybatis-config.xml文件的存在,只有在需要配置<settings>, <typeAliases>, <mappers>(其实mapper也一并也是在applicationContext.xml中进行配置)才需要mybatis-config.xml文件的存在:

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<?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>

  <typeAliases>

      <package name="net.aazj.pojo"/>

  </typeAliases>

</configuration>
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<settings>指定了数据库操作相关的设置,typeAliases指定了可以给数据库表对应的类所在的包路径,可以在sql的xml使用它们的别名:

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package net.aazj.pojo;



import org.apache.ibatis.type.Alias;



@Alias("User")

public class User {



    private Integer id;



    private String name;



        // ... ...



}
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@Alias("User")注解了该pojo的别名,所以可以在xml文件中使用别名 User 来代替:net.aazj.pojo.User

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<?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="net.aazj.mapper.UserMapper">

     <cache />

     

    <select id="getUser" resultType="User">

        select * from user where id = #{id}

    </select>



    <select id="addUser" parameterType="string">

        insert into user(name) values(#{name})

    </select>

</mapper>
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这里 resultType="User" 不需要使用全限定类名。<cache />启用了基于namespace="net.aazj.mapper.UserMapper"的全局缓存。

5. generatorConfig.xml

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<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE generatorConfiguration

  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"

  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">



<generatorConfiguration>

  <classPathEntry location="D:\java_libs\repository\mysql\mysql-connector-java\5.1.35\mysql-connector-java-5.1.35.jar" />

 

  <context id="MySQLTables" targetRuntime="MyBatis3">

  

    <jdbcConnection driverClass="com.mysql.jdbc.Driver"

        connectionURL="jdbc:mysql://localhost:3306/sy"

        userId="root"

        password="xxxxx">

    </jdbcConnection>



    <javaTypeResolver >

      <property name="forceBigDecimals" value="false" />

    </javaTypeResolver>



    <javaModelGenerator targetPackage="net.aazj.pojo" targetProject="sp\src\main\java">

      <property name="enableSubPackages" value="true" />

      <property name="trimStrings" value="true" />

    </javaModelGenerator>



    <sqlMapGenerator targetPackage="config.mappers"  targetProject="sp\src\main\resources">

      <property name="enableSubPackages" value="true" />

    </sqlMapGenerator>



    <javaClientGenerator type="XMLMAPPER" targetPackage="net.aazj.mapper"  targetProject="sp\src\main\java">

      <property name="enableSubPackages" value="true" />

    </javaClientGenerator>



    <table schema="sy" tableName="tbug" domainObjectName="Bug" >

      <property name="useActualColumnNames" value="false"/>

      <generatedKey column="id" sqlStatement="mysql" identity="true" />

      <!-- 

      <columnOverride column="DATE_FIELD" property="startDate" />

      <ignoreColumn column="FRED" />

      <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />

       -->

    </table>

    <table schema="sy" tableName="user" domainObjectName="User" >

      <property name="useActualColumnNames" value="false"/>

      <generatedKey column="id" sqlStatement="mysql" identity="true" />

    </table>



  </context>

</generatorConfiguration>
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上面是Mybatis generator的配置文件:

1)classPathEntry  指定驱动位置;

2)jdbcConnection 指定数据库连接信息;

3)javaModelGenerator 指定生成的pojo类的位置;

4)sqlMapGenerator 指定指定生成的sql xml文件的位置;

5)javaClientGenerator 指定 mapper 接口的位置;

6)table 指定将数据库中哪些表进行处理;<generatedKey column="id" sqlStatement="mysql" identity="true" /> 用于指定主键;

 

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