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Java開發(fā)之ssm三大框架整合

更新時(shí)間：2022年05月16日 09:18:35 作者：仰望星空的快樂

SSM框架是spring?MVC?，spring和mybatis框架的整合，是標(biāo)準(zhǔn)的MVC模式，將整個(gè)系統(tǒng)劃分為表現(xiàn)層，controller層，service層，DAO層四層，使用spring?MVC負(fù)責(zé)請求的轉(zhuǎn)發(fā)和視圖管理，spring實(shí)現(xiàn)業(yè)務(wù)對象管理，mybatis作為數(shù)據(jù)對象的持久化引擎

1.springmvc

和只有spring-mvc時(shí)一樣，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">
<!--    注解驅(qū)動-->
    <mvc:annotation-driven/>
<!--    靜態(tài)資源過濾-->
<!--    開啟jsp專用的視圖控制器 internalresourceresoler-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--    設(shè)置前綴-->
        <property name="prefix" value="/WEB-INF/templates/"></property>
        <!--    設(shè)置后綴-->
        <property name="suffix" value=".jsp"></property>
    </bean>
<!--    掃描 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">
<!--    設(shè)置攔截器，解決參數(shù)亂碼，一定要在設(shè)置HiddenHttpMethodFilter請求前，要在其他攔截器和servlet執(zhí)行前設(shè)置編碼-->
    <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>
<!--        解決返回的請求數(shù)亂碼  response-->
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
<!--攔截所有頁面-->
    <filter-mapping>
        <filter-name>paramencoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
<!--servlet 將所有除了jsp的頁面攔截，交給dispatcherservlet視圖控制器，并設(shè)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>
<!-- 攔截所有請求，并交給hiddenhttpmethodfilter 檢測否是post請求，且_method不為空，如果是，就將請求類型改為_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與mybatis-config.xml

主要就是spring整合mybatis

spring整合mybatis

在上面的基礎(chǔ)上，去掉成接口的實(shí)現(xiàn)類了，需要配置dao接口掃描包，我的理解是這個(gè)dao接口掃描包中有datasource，有mapper的掃描范圍, 它會自動生成這些接口對應(yīng)的mapper,并將接口的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">
    <!-- 讀取數(shù)據(jù)庫配置文件-->
    <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"/>
        <!-- 關(guān)閉連接后不自動commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 獲取連接超時(shí)時(shí)間 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 當(dāng)獲取連接失敗重試次數(shù) -->
        <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接口掃描包 ，動態(tài)的實(shí)現(xiàn)了dao接口可以注入到spring容器中
  就是用來代替BookMapperImpl類 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--        注入sqlsessionfactory-->
<!--個(gè)人理解,這個(gè)dao接口掃描包中有datasource，有mapper的掃描范圍,
它會自動生成這些接口對應(yīng)的mapper,并將接口的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>
<!--        要掃描的dao包, 會自動生成包下的類的接口的實(shí)現(xiàn)類-->
        <property name="basePackage" value="com.hxut.rj1192.zyk"></property>
    </bean>
</beans>

mybatis-config.xml 詳細(xì)在上面的mybatis整合spring的文章中，它做兩件事，配置映射文件路徑，配置接口掃描范圍，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>
<!--    配置數(shù)據(jù)源交給spring了-->
    <!--    給類起別名-->
    <typeAliases>
        <package name="com.hxut.rj1192.zyk.mapper"/>
    </typeAliases>
    <!--    設(shè)置映射文件路徑-->
    <mappers>
        <mapper resource="com/hxut/rj1192/zyk/mapper/Bookmapper.xml"></mapper>
    </mappers>
</configuration>

3.spring-service.xml

在這個(gè)文件中要進(jìn)行事務(wù)的處理（事務(wù)本來就應(yīng)該是在service層），要將service層的類全部放到ioc容器中，然后這些類中因?yàn)檎{(diào)用了dao層的類，然后因?yàn)閯偛诺诙颗渲昧私涌趻呙璋苯觬ef獲取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">
<!--    開啟注解驅(qū)動-->
    <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>
<!--    聲明式事務(wù)-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--       注入數(shù)據(jù)源 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>
</beans>

4.引用

將這些文件的引用放到一個(gè)大的xml文件中，這個(gè)文件只放引用，這樣就很容易看

<?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中設(shè)置 spring application context，效果是一樣的