Servlet+Spring+Mybatis初试

1.导入相关的jar包
    druid
    mybatis
    mybatis-spring
    pageHelper
    mysql驱动包
    spring-context-support
    spring-aspect
    spring-jdbc 事务切面
    spring-tx 事务建议
    spring-web
    servlet-api
    jsp-api
    jstl
    standard
    lombok
    log4j
2.相关的配置文件
    jdbc.propertites
    applicationContext.xml
    *mapper.xml
    log4j.properties
3.记住一些核心类
    DruidDataSource 德鲁伊的核心类
    SqlSessionFactoryBean   mybatis-spring变为mybatis-config.xml
    DataSourceTransactionManager 事务切面
    做建议 read-only
4.步骤
    1.先导入jar包
    2.编写核心配置文件
        2.1 数据源处理
        2.2 SqlSessionFactoryBean
        2.3 SqlSessionTemplate
        2.4 切面 DataSourceTransactionManager
        2.5 AOP 关注点 execution(* com.blb.service..*(..)) 关注的都是业务层，要么都执行，要么都不执行
        2.6 为当前事务设置一些建议，哪些方法要事务，哪些方法不要事务
            增删改 一定要事务
            查询 可加可不加
        2.7 构建项目
            分层设计 遵循三层的设计原则  BeanUtils用于进行多层实体类之间的数据转换
            控制层 controller/action       vo
            业务层 biz/service             bo
            持久层 dao/repository
            实体类 domain/pojo/dto/model/bean
    3.具体实现
        3.1 编写映射文件 SQL语句 mybatis讲究的是代码和SQL分离
        3.2 在DAO中注入sqlSession
        3.3 编写持久层代码
        3.4 编写业务层代码
        3.5 编写控制层代码
    4.和我们的web项目做一个整合
        我们必须引入spring-web的jar包 主要的用途是用来当前项目初始化就加载配置文件并生成IOC容器的

 <?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:aop="http://www.springframework.org/schema/aop"
        xmlns:tx="http://www.springframework.org/schema/tx"
        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-4.1.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
 ">
 
     <!--启用注解-->
     <context:annotation-config></context:annotation-config>
     <!--引入外部的属性文件jdbc.properties-->
     <context:property-placeholder location="classpath*:jdbc.properties"></context:property-placeholder>
     <!--配置扫描路径-->
     <context:component-scan base-package="com.blb"></context:component-scan>
     <!--将druid连接池加入到IOC容器中-->
     <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
         <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
         <property name="url" value="jdbc:mysql://localhost:3306/rbac2?useUnicode=true&amp;characterEncoding=utf8&amp;characterSetResults=utf8"></property>
         <property name="username" value="root"></property>
         <property name="password" value="root"></property>
 
     </bean>
 
     <!--分页插件-->
     <bean id="pageHelper" class="com.github.pagehelper.PageInterceptor">
         <property name="properties">
             <props>
                 <prop key="helperDialect">mysql</prop>
             </props>
         </property>
     </bean>
 
     <!--sqlSessionFactoryBean加入到容器中-->
     <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
         <property name="dataSource" ref="dataSource"></property>
         <property name="plugins">
             <array>
                 <ref bean="pageHelper"></ref>
             </array>
         </property>
         <property name="typeAliasesPackage" value="com.blb.dto"></property>
         <property name="mapperLocations" value="classpath*:*com/blb/mapper/*.xml"></property>
     </bean>
     <!--sqlSessionTemplate-->
     <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
         <constructor-arg index="0" ref="sqlSessionFactoryBean"></constructor-arg>
     </bean>
     <!--配置jdbc包中切面-->
     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
         <property name="dataSource" ref="dataSource"></property>
     </bean>
     <!--配置建议规则-->
     <tx:advice id="tx" transaction-manager="transactionManager">
         <tx:attributes>
             <tx:method name="get*" read-only="true"/>
             <tx:method name="select*" read-only="true"></tx:method>
             <tx:method name="query*" read-only="true"></tx:method>
             <tx:method name="insert*" propagation="REQUIRED"></tx:method>
             <tx:method name="save*" propagation="REQUIRED"></tx:method>
             <tx:method name="update*" propagation="REQUIRED"></tx:method>
             <tx:method name="modify*" propagation="REQUIRED"></tx:method>
             <tx:method name="remove*" propagation="REQUIRED"></tx:method>
             <tx:method name="delete*" propagation="REQUIRED"></tx:method>
         </tx:attributes>
     </tx:advice>
 
     <!--开启切面代理-->
     <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
     <!--先来实现关注点-->
     <aop:config>
         <aop:pointcut id="service" expression="execution(* com.blb.service..*(..))"/>
         <aop:advisor advice-ref="tx" pointcut-ref="service"></aop:advisor>
     </aop:config>
 
 </beans>

 @Log4j
 @WebServlet("/user")
 public class UserController extends HttpServlet {
 
     private UserService userService;
 
     @Override
     public void init() throws ServletException {
         WebApplicationContext webcontainer = WebApplicationContextUtils.getWebApplicationContext(getServletContext());
         this.userService= (UserService)webcontainer.getBean("userServiceImpl");
 　　　　　　//与IOC容器交互，从IOC容器里拿到userService单列
     }
 
     @Override
     protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
         String m = req.getParameter("m");
         if(m.equals("save"))
         {
             save(req,resp);
         }
         else if(m.equals("update"))
         {
             update(req,resp);
         }
         else if(m.equals("delete"))
         {
             delete(req,resp);
         }
         else if(m.equals("select"))
         {
             select(req,resp);
         }
         else if(m.equals("selectAll"))
         {
             selectAll(req,resp);
         }
 
     }

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                       http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
          version="3.1">
   <!--1.告诉spring的核心配置文件叫什么名字-->
   <context-param>
     <param-name>contextConfigLocation</param-name>
     <param-value>classpath*:applicationContext.xml</param-value>
   </context-param>
   <!--2.我给你一个监听器  监听器用来使用上面的配置，加载配置文件-->
   <listener>
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
   </listener>
 </web-app>