SSM整合總結
阿新 • • 發佈:2018-12-18
SSM框架集由Spring、SpringMVC、MyBatis整合而成。Spring是一個輕量級的控制反轉(IoC)和麵向切面(AOP)的容器框架;SpringMVC分離了控制器、模型物件、分派器以及處理程式物件的角色,這種分離讓它們更容易進行定製;MyBatis是一個支援SQL查詢,儲存過程和高階對映的優秀持久層框架。頁面傳送請求給控制器,控制器呼叫業務層處理邏輯,邏輯層向持久層傳送請求,持久層與資料庫互動後將結果返回給業務層,業務層將處理邏輯傳送給控制器,控制器再呼叫檢視展現資料。 SSM整合步驟:
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- 在Eclipse中建立一個Maven版的Web工程,注意需要通過BuildPath,找到Maven->Project Facets,取消並重新勾選Dynamic Web Module選項,然後才會建立WebContent目錄。
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- 在pom.xml中引入以下jar包:
<dependencies> <!-- 只需要將spring-context的jar包的依賴配置上,其他依賴的jar包會自動匯入 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.0.0.RELEASE</version> </dependency> <!-- 只需要匯入spring-webmvc的jar包,Maven會自動將它依賴的spring-web的jar匯入 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.0.0.RELEASE</version> </dependency> <!-- MyBatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.2</version> </dependency> <!-- mybatis-spring --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <!-- spring-jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.0.0.RELEASE</version> </dependency> <!-- MySql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.37</version> </dependency> <!-- druid資料庫連線池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.9</version> </dependency> <!-- log4j日誌檔案管理包 --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <!-- jstl標籤類 --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>org.apache.taglibs</groupId> <artifactId>taglibs-standard-impl</artifactId> <version>1.2.5</version> </dependency> </dependencies>
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- 整合SpringMVC,配置springmvc.xml
<!-- 設定自動掃描的包,需在namespace中勾選context --> <context:component-scan base-package="org.javaee.ssm" use-default-filters="false"> <!-- 設定只掃描用了@Controller註解的類(控制器) --> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <!-- 配置檢視解析器 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/pages/"></property> <property name="suffix" value=".jsp"></property> </bean> <!-- 配置處理靜態資源,需在namespace中勾選mvc --> <mvc:default-servlet-handler/> <!-- 配置註解驅動 --> <mvc:annotation-driven></mvc:annotation-driven>
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- 配置web.xml,配置DispatcherServlet、ContextLoaderListener、CharacterEncodingFilter。
<-- 配置DispatcherServlet,快捷鍵:Alt+/,選擇倒數第二項 -->
<servlet>
<servlet-name>springDispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 配置ContextLoaderListener,快捷鍵:Alt+/,選擇倒數第三項 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:beans.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 配置過濾器CharacterEncodingFilter,目的是為了解決請求和響應的亂碼問題 -->
<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>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
- 整合Spring(+MyBatis),配置beans.xml之前,先匯入以下檔案:1)連線資料庫有關資訊的屬性檔案:druid.properties
jdbc.username=root
jdbc.password=123456
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.initialSize=10
jdbc.minIdle=5
jdbc.maxActive=20
jdbc.maxWait=5000
2)MyBatis的配置檔案mybatis-config.xml(因可以在beans.xml檔案中配置MyBatis相關引數,故可不要此檔案) 3)log4j.xml,日誌資訊,能輸出SQL語句 配置beans.xml
<!-- 設定自動掃描的包,需在namespace中勾選context -->
<context:component-scan base-package="org.javaee.ssm">
<!-- 設定不掃描使用了@Controller註解的類 -->
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!-- 引入外部的屬性檔案 -->
<context:property-placeholder location="classpath:druid.properties"/>
<!-- 配置資料來源 -->
<bean id="druidDataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="driverClassName" value="${jdbc.driverClassName}"></property>
<property name="initialSize" value="${jdbc.initialSize}"></property>
<property name="minIdle" value="${jdbc.minIdle}"></property>
<property name="maxActive" value="${jdbc.maxActive}"></property>
<property name="maxWait" value="${jdbc.maxWait}"></property>
</bean>
<!-- 整合MyBatis -->
<!-- 1. 配置SqlSessionFactoryBean-->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 配置資料來源屬性 -->
<property name="dataSource" ref="druidDataSource"></property>
<!-- 配置MyBatis的全域性配置檔案 -->
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- 配置Mapper介面的對映檔案 -->
<property name="mapperLocations" value="classpath:org/javaee/ssm/mapper/*.xml"></property>
</bean>
<!-- 2.掃描Mapper介面,需在namespace中勾選mybatis-spring -->
<mybatis-spring:scan base-package="org.javaee.ssm.mapper"/>
- 建立Mapper介面(如UserMapper,與資料庫互動的抽象方法),並建立Mapper對映檔案UserMapper.xml(對應抽象方法需要的各個SQL語句)
- 建立業務邏輯層的UserService介面和其實現類UserServiceImpl,以及表現層的控制器UserHandler
@Service("userService")
public class UserServiceImpl implements UserService {
//在UserService中注入UserMapper
@Autowired
private UserMapper userMapper;
...
}
@Controller
public class UserHandler {
//在UserHandler中注入UserService
@Autowired
private UserService userService;
...
}