教你搭建SSM项目框架

搭建一个SSM框架有三个基本的配置文件
- Spring的配置文件ApplicationContext.xml
- SpringMVC的配置文件DispatcherServlet.xml
- mybatis的配置文件 mybatis-config.xml
当然还有配置整个web容器的web.xml文件.还有其他的许多高级特性,我们在使用的时候再进行配置

web.xml

<pre style="background-color:#272822;color:#f8f8f2;font-family:'Fira Code';font-size:10.8pt;"><!DOCTYPE web-app PUBLIC
  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<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_2_5.xsd"
  id="WebApp_ID" version="2.5">
 <display-name>Archetype Created Web Application</display-name>
  <!-- 一: Spring容器-->
 <!--指定在Spring容器启动的时候在哪里读取配置文件-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <!--配置一个监听器,让项目一启动就启动Spring容器-->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- 二: SpringMVC的前端控制器-->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
 <servlet-mapping>
   <servlet-name>dispatcherServlet</servlet-name>
   <url-pattern>/</url-pattern>
 </servlet-mapping>
  <!-- 三: 字符编码过滤器,放在所有过滤器之前-->
  <filter>
    <filter-name>CharacterEncodingFilter</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>
    <init-param>
      <param-name>forceRequestEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
    <init-param>
     <param-name>forceResponseEncoding</param-name>
     <param-value>true</param-value>
    </init-param>
 </filter>
 <filter-mapping>
   <filter-name>CharacterEncodingFilter</filter-name>
   <url-pattern>/*</url-pattern>
 </filter-mapping>
  <!-- 四: RESTf 风格的uri-->
  <filter>
    <filter-name>HiddenHttpMethodFilter</filter-name>
    <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
 </filter>
 <filter-mapping>
   <filter-name>HiddenHttpMethodFilter</filter-name>
   <url-pattern>/*</url-pattern>
 </filter-mapping>
</web-app>
</pre>

在这里我们主要把Spring加入到web容器中去,配置spring的配置文件的位置,再让Web容器一启动就启动Spring容器,实际上Spring容器是作为一个处理所有请求的Servlet容器存在的,只不过他的init时间是容器启动时刻罢了.

ApplicationContext.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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <context:component-scan base-package="com.atguigu">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"></context:exclude-filter>
    </context:component-scan>

    <!--=================================Spring的配置文件,这里主要配置和业务有关的=======================================-->
    <!--数据源-->
    <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
    <bean id="pooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="jdbcUrl" value="${jdbc.jdbcurl}"></property>
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>


    <!--=======================================配置和mybatis整合=================================================-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定mybatis全局配置文件的位置 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="dataSource" ref="pooledDataSource"/>
        <!-- 指定mybatis，mapper文件的位置 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
    </bean>
    <!--配置扫描器,将mybatis接口的实现放入IOC容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--扫描所有的dao接口的实现,加入到IOC容器之中去-->
        <property name="basePackage" value="com.atguigu.crud.dao"></property>
    </bean>
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"></constructor-arg>
        <constructor-arg name="executorType" value="BATCH"></constructor-arg>
    </bean>


    <!--============================================事务控制的配置=================================================-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--控制住数据源-->
        <property name="dataSource" ref="pooledDataSource"/>
    </bean>

    <!--开启基于注解的事物,使用xml配置形式的事物-->
    <aop:config>
        <!--切入点表达式-->
        <aop:pointcut id="txpoint" expression="execution(* com.atguigu.crud.service..*(..))"></aop:pointcut>
        <!--配置事务增强-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txpoint"/>
    </aop:config>

    <!--配置事务增强，事务如何切入  -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- 所有方法都是事务方法 -->
            <tx:method name="*"/>
            <!--以get开始的所有方法  -->
            <tx:method name="get*" read-only="true"/>
        </tx:attributes>
    </tx:advice>
    <!--Spring配置文件的核心点(数据源,与mybatis的整合,事务控制)-->

</beans>

这里还使用到了一个数据库的连接配置文件db.properties

db.properties

jdbc.jdbcurl = jdbc:mysql://localhost:3306/db-crud?characterEncoding=utf8&useSSL=true
jdbc.driverClass = com.mysql.jdbc.Driver
jdbc.user = root
jdbc.password = 960611

DispatcherServlet.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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
    <!--springMVC的配置文件,主要包含网站的跳转逻辑的控制,配置-->
    <context:component-scan base-package="com.atguigu" use-default-filters="false">
        <!--只扫描Controller-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"></context:include-filter>
    </context:component-scan>

    <!--配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/view"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!--两个标准配置-->
    <!--将springmvc不能处理的请求交给tomcat-->
    <mvc:default-servlet-handler/>
    <!--能支持springmvc一些更高级的功能,比如JSR303校验,快捷的ajax请求...映射动态请求-->
    <mvc:annotation-driven/>
</beans>

mybatis-config.xml

<?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="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <typeAliases>
        <package name="com.atguigu.crud.bean"/>
    </typeAliases>
    <!--plugins标签放在typeAliases标签之后-->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>
</configuration>

项目的目录结构: