Java开发之ssm三大框架整合
作者:仰望星空的快乐
SSM框架是spring MVC ,spring和mybatis框架的整合,是标准的MVC模式,将整个系统划分为表现层,controller层,service层,DAO层四层,使用spring MVC负责请求的转发和视图管理,spring实现业务对象管理,mybatis作为数据对象的持久化引擎
1.springmvc
和只有spring-mvc时一样,web.xml spring-mvc.xml
spring-mvc.xml
<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/cache" 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/cache http://www.springframework.org/schema/cache/spring-cache.xsd"> <!-- 注解驱动--> <mvc:annotation-driven/> <!-- 静态资源过滤--> <!-- 开启jsp专用的视图控制器 internalresourceresoler--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 设置前缀--> <property name="prefix" value="/WEB-INF/templates/"></property> <!-- 设置后缀--> <property name="suffix" value=".jsp"></property> </bean> <!-- 扫描 controller注解--> <context:component-scan base-package="com.hxut.rj1192.zyk.Controller"></context:component-scan> </beans>
web.xml
<?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"> <!-- 设置拦截器,解决参数乱码,一定要在设置HiddenHttpMethodFilter请求前,要在其他拦截器和servlet执行前设置编码--> <filter> <filter-name>paramencoding</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> <!-- 解决返回的请求数乱码 response--> <init-param> <param-name>forceResponseEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <!--拦截所有页面--> <filter-mapping> <filter-name>paramencoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!--servlet 将所有除了jsp的页面拦截,交给dispatcherservlet视图控制器,并设置dispatcherservlet的xml文件的位置--> <servlet-mapping> <servlet-name>all</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <servlet> <servlet-name>all</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> </servlet> <!-- 拦截所有请求,并交给hiddenhttpmethodfilter 检测否是post请求,且_method不为空,如果是,就将请求类型改为_method的值--> <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>
2.spring-dao.xml与mybatis-config.xml
主要就是spring整合mybatis
在上面的基础上,去掉成接口的实现类了,需要配置dao接口扫描包,我的理解是这个dao接口扫描包中有datasource,有mapper的扫描范围, 它会自动生成这些接口对应的mapper,并将接口的mapper放到xml文件中,所以在spring-service中,直接
<property name="bookmapper" ref="bookmapper"></property>
引用即可
<?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.springframwork.org/schema/context/spring-context.xsd"> <!-- 读取数据库配置文件--> <context:property-placeholder location="classpath:database.properties"></context:property-placeholder> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}"/> <property name="jdbcUrl" value="${jdbc.url}"/> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <property name="maxPoolSize" value="30"/> <property name="minPoolSize" value="10"/> <!-- 关闭连接后不自动commit --> <property name="autoCommitOnClose" value="false"/> <!-- 获取连接超时时间 --> <property name="checkoutTimeout" value="10000"/> <!-- 当获取连接失败重试次数 --> <property name="acquireRetryAttempts" value="2"/> </bean> <bean id="sqlsessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"></property> <property name="configLocation" value="classpath:mybatis-config.xml"></property> </bean> <!--配置dao接口扫描包 ,动态的实现了dao接口可以注入到spring容器中 就是用来代替BookMapperImpl类 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 注入sqlsessionfactory--> <!--个人理解,这个dao接口扫描包中有datasource,有mapper的扫描范围, 它会自动生成这些接口对应的mapper,并将接口的mapper放到xml文件中,所以在spring-service中,直接 <property name="bookmapper" ref="bookmapper"></property> 引用即可--> <property name="sqlSessionFactoryBeanName" value="sqlsessionFactory"></property> <!-- 要扫描的dao包, 会自动生成包下的类的接口的实现类--> <property name="basePackage" value="com.hxut.rj1192.zyk"></property> </bean> </beans>
mybatis-config.xml 详细在上面的mybatis整合spring的文章中,它做两件事,配置映射文件路径,配置接口扫描范围,它被import到 spring-dao.xml中。
<?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> <!-- 配置数据源交给spring了--> <!-- 给类起别名--> <typeAliases> <package name="com.hxut.rj1192.zyk.mapper"/> </typeAliases> <!-- 设置映射文件路径--> <mappers> <mapper resource="com/hxut/rj1192/zyk/mapper/Bookmapper.xml"></mapper> </mappers> </configuration>
3.spring-service.xml
在这个文件中要进行事务的处理(事务本来就应该是在service层),要将service层的类全部放到ioc容器中,然后这些类中因为调用了dao层的类,然后因为刚才第二部配置了接口扫描包,直接ref获取mapper即可
<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.springframwork.org/schema/context/spring-context.xsd"> <!-- 开启注解驱动--> <context:component-scan base-package="com.hxut.rj1192.zyk.service"></context:component-scan> <bean id="booksServiceimpl" class="com.hxut.rj1192.zyk.service.BooksServiceimpl"> <property name="bookmapper" ref="bookmapper"></property> </bean> <!-- 声明式事务--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!-- 注入数据源 --> <property name="dataSource" ref="dataSource"></property> </bean> </beans>
4.引用
将这些文件的引用放到一个大的xml文件中,这个文件只放引用,这样就很容易看
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <import resource="applicationContext.xml"></import> <import resource="spring-dao.xml"></import> <import resource="Spring-Service.xml"></import> <import resource="Spring-springmvc.xml"></import> </beans>
或者在project structure中设置 spring application context,效果是一样的
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