idea整合ssm基础案例

一、项目目录结构

二、环境

通过新建maven项目，添加spring，删除多余的web.xml，添加tomcat服务器。

三、重要代码

1.pom.xml

org.springframework spring-context 4.3.9.RELEASE junit junit 4.12 mysql mysql-connector-java 5.1.40

<!--第一步 配置pom.xml-->
<!-- druid连接池 【亿万级并发】双十一 双十二 秒杀活动-->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>1.0.29</version>
</dependency>

<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.2.8</version>
</dependency>

<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis-spring</artifactId>
  <version>1.3.1</version>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jdbc</artifactId>
  <version>4.3.9.RELEASE</version>
</dependency>

<!--<dependency>-->
<!--<groupId>org.springframework</groupId>-->
<!--<artifactId>spring-webmvc</artifactId>-->
<!--<version>4.3.9.RELEASE</version>-->
<!--</dependency>-->

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.8.5</version>
</dependency>


<!--自己加的-->
<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>4.0.0</version>
  <scope>provided</scope>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.8.5</version>
</dependency>

2.将所需要的jar包添加到web-inf的lib目录下
3.web.xml–版本改为3.1

<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>

4.修改默认dispatcher-servlet.xml，引入自己配置的spring-configs.xml

一句话：<import resource="classpath:spring-configs.xml"/>

5.spring-configs.xml
<context:component-scan base-package=“com.jt”/>
<import resource="classpath:spring-mvc.xml"/> <import resource="classpath:spring-mybatis.xml"/>

6.spring-mvc.xml

7.spring-mybaties.xml

 <util:properties id="cfg" location="classpath:configs.properties"/>
    <!-- 整合Druid连接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
          init-method="init"
          destroy-method="close"
          lazy-init="false">
        <property name="DriverClassName" value="#{cfg.jdbcDriver}"/>
        <property name="Url" value="#{cfg.jdbcUrl}"/>
        <property name="Username" value="#{cfg.jdbcUser}"/>
        <property name="Password" value="#{cfg.jdbcPassword}"/>
    </bean>
    <!--整合SqlSesionFactoryBean对象(通过此对象创建SqlSessionFactory)  -->
    <bean id="sqlSessionFactory"
          class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="DataSource" ref="dataSource"/>
        <property name="MapperLocations"
                  value="classpath*:mapper/sys/*Mapper.xml"/>
    </bean>
    <!-- 配置dao接口扫描，底层会基于dao接口创建这个接口的代理对象，这个代理
                     对象内部会通过mybatis访问数据库 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="BasePackage" value="com.jt.**.dao"/>
        <property name="SqlSessionFactoryBeanName"
                  value="sqlSessionFactory"/>
    </bean>