在整合三大框架SSM , 即 Spring 和 SpingMVC和Mybatis的时候,搭建项目最初需要先配置好配置文件.
有人在刚开始学习框架的时候会纠结项目搭建的顺序,因为频繁的报错提示是会很影响强迫症和编程心情的,这里分享我在构建项目时候的心得和配置文件的编写
首先你需要知道你的项目需要哪些结构,我们这里举一个基于Java的简单Web项目,实现最简单的功能,我需要Mybatis来进行持久层的控制,那么Mybatis就需要配置文件,我需要Dao层提供数据,那就需要Dao层的配置文件,我还需要服务层,那就需要Service的配置文件,再其次,我在进行一些选项的时候需要开启事务操作,那就需要事务的配置文件,最后是整合的SpringMVC的配置文件.
那么综上而言 我们把文件列表可以罗列出来:
Mybatis的配置文件: sqlMapConfig.xml
Spring的配置文件: applicationContext-dao.xml
applicationContext-service.xml
applicationContext-tx.xml
springmvc.xml
外部的Properties配置文件: jabc.properties 和 log4j.properties
学会配置xml文件是学习spring的基础,需要长时间的练习来达到熟练的效果.
我们先编写jabc.properties的配置文件:
这里使用的是阿里云的连接池Druid:
druid.url=jdbc:mysql://localhost:3306/egoubuy?characterEncoding=utf-8
druid.password=root
druid.username=root
druid.driverClassName=com.mysql.jdbc.Driver
druid.initialSize=5
druid.minIdle=3
druid.maxActive=20
再编写log4j.properties:
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
现在,我们开始编写SSM的xml
首先配置Mybatis的配置文件
<?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> <plugins> <!-- com.github.pagehelper为PageHelper类所在包名 --> <plugin interceptor="com.github.pagehelper.PageInterceptor"> </plugin> </plugins> </configuration>
然后配置Spring下的Dao配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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 https://www.springframework.org/schema/context/spring-context.xsd"> <!--加载外部属性配置文件--> <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder> <!--数据源--> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="url" value="${druid.url}"></property> <property name="username" value="${druid.username}"></property> <property name="password" value="${druid.password}"></property> <property name="driverClassName" value="${druid.driverClassName}"></property> <property name="initialSize" value="${druid.initialSize}"></property> <property name="minIdle" value="${druid.minIdle}"></property> <property name="maxActive" value="${druid.maxActive}"></property> </bean> <!--配置sqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--配置mybatis配置文件,这里的名称一定要对应--> <property name="configLocation" value="classpath:mybatis/sqlMapConfig.xml"></property> <!--配置数据源对象--> <property name="dataSource" ref="dataSource"></property> </bean> <!--批量配置mapper接口: 通过mapper扫描器,扫描某个包下的所有mapper接口,批量加载配置 --> <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!--设置需要扫描的包--> <property name="basePackage" value="这里是你需要的被扫描的包"></property> <!--配置sqlSessionFactory对象--> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property> </bean> </beans>
再编写service的配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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 https://www.springframework.org/schema/context/spring-context.xsd"> <!--扫描service包,将service包下添加@Servcie注解的类添加到容器中--> <context:component-scan base-package="这里是你编写的service的包"></context:component-scan> </beans>
由于需要开启事务,再编写事务的配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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/aop https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd "> <!--配置事务管理器--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <!--配置通知--> <tx:advice id="tx_advice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="insert*" propagation="REQUIRED" isolation="DEFAULT"/> <tx:method name="add*"></tx:method> <tx:method name="update*"></tx:method> <tx:method name="modify*"></tx:method> <tx:method name="delete*"></tx:method> <tx:method name="remove*"></tx:method> <tx:method name="get*" read-only="true"></tx:method> <tx:method name="select*" read-only="true"></tx:method> <tx:method name="query*" read-only="true"></tx:method> </tx:attributes> </tx:advice> <!--配置切面--> <aop:config> <aop:advisor advice-ref="tx_advice" pointcut="execution(* 这里一般写service的类所在包.*.*(..))"></aop:advisor> </aop:config> </beans>
最后是编写springmvc的配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!--配置扫描controller包下的所有以@Controller注解修饰的类--> <context:component-scan base-package="这里是控制器的所在类,你可以放一起写,也可以分开写"></context:component-scan> <!--配置注解驱动--> <mvc:annotation-driven></mvc:annotation-driven> <!--放行静态资源文件--> <mvc:default-servlet-handler></mvc:default-servlet-handler> <!--视图解析器--> <bean id="resourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--配置文件上传解析器 吐过需要,你就打开注释commons-io commons-fileupload--> <!--<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="10000000"></property> </bean>--> </beans>
Java代码部分不做展示没有意义,当你在写项目的时候也要注意web.xml的配置,前提是web的项目
<?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_4_0.xsd" version="4.0"> <!--配置post提交中文乱码的过滤器--> <filter> <filter-name>characterEncoding</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> </filter> <filter-mapping> <filter-name>characterEncoding</filter-name> <url-pattern>*</url-pattern> </filter-mapping> <!--给监听器指定初始化参数,用于加载spring配置文件--> <context-param> <param-name>contextConfigLocation</param-name> <!--classpath:spring/applicationContext-dao.xml,classpath:spring/applicationContext-tx.xml,classpath:spring/applicationContext-servcie.xml--> <param-value>classpath:spring/applicationContext-*.xml</param-value> </context-param> <!--配置监听器 加载spring配置文件--> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!--配置前端控制器--> <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/springmvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
关于涉及到spring相关的项目的xml文件bean头文件导包的问题,在idea中一般是自动的,你可以在setting中配置自动加载,同时,每一个需要的包都是对应好的,所以不用担心,编程使我们快乐,欢迎入坑框架.