SSM整合
SSM整合包含三个阶段:
1.Spring与Spring MVC整合
2.Spring与Mybatis整合配置
3.整合其他组件:声明式事务/日志/任务调度/...
1.Spring与Spring MVC整合
Spring与Spring MVC的整合包括以下步骤:
配置spring-webmvc等依赖 配置DispatcherServlet 启用Spring MVC注解模式 配置请求与响应字符集 配置FreeMarker模板引擎 配置Json序列化组件
在pom.xml中配置相关依赖
<repositories>
<repository>
<id>aliyun</id>
<name>aliyun</name>
<url>https://maven.aliyun.com/repository/public</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.19</version>
</dependency>
<!--freemarker-->
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.31</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>5.3.19</version>
</dependency>
<!--jackson-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.13.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.13.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.13.2</version>
</dependency>
</dependencies>
在web.xml中配置DispatcherServlet
<?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">
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext*.xml</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
在applicationContext.xml中启用注解模式
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mv="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
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--开启SpringMVC注解模式-->
<context:component-scan base-package="com.imooc"/>
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>
</beans>
配置请求与响应字符集
Get请求乱码问题在tomcat8版本以后已经得到解决,post请求乱码问题需要在web.xml中进行额外的配置,响应乱码问题需要在applicationContext.xml的<mvc:annotation-driven>标签中进行额外的配置,具体代码如下:
<!--解决post请求中文乱码问题-->
<filter>
<filter-name>characterFilter</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>characterFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<mvc:annotation-driven>
<mvc:message-converters>
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=utf-8</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<mvc:default-servlet-handler/>
在applicationContext.xml中配置freemarker模板引擎
<!--配置FreeMarker模板引擎-->
<bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
<property name="templateLoaderPath" value="/WEB-INF/ftl"/>
<property name="freemarkerSettings">
<props>
<prop key="defaultEncoding">UTF-8</prop>
</props>
</property>
</bean>
<bean id="ViewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
<property name="contentType" value="text/html;charset=utf-8"/>
<property name="suffix" value=".ftl"/>
</bean>
配置Json序列化组件
2.Spring与MyBatis整合
在MyBatis中通过MyBatisUtils工具类对SqlSessionFactory进行初始化,这里是通过new关键字在代码中进行的初始化,而不会被Spring管理,这会导致MyBatis不能拥有Spring拓展的便捷功能(日志管理、任务调度、声明式事务等)。
因此,MyBatis提供了一个组件mybatis-spring,它的功能是:不再需要我们手动初始化SqlSessionFactory对象,只需在Spring IOC容器中进行简单的配置,就能让IOC容器在初始化的时候自动创建SqlSessionFactory对象,同时这个对象也会被IOC管理。
整合步骤:
依赖mybatis-spring及驱动 配置数据源与连接池 配置SqlSessionFactory对象 配置Mapper扫描器 创建mybatis-config.xml
在pom.xml中配置相关依赖
<!--MyBatis整合部分的依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.3.17</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.7</version>
</dependency>
<!--MaBatis与Spring整合组件-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.7</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.49</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.17</version>
</dependency>
在applicationContext.xml中配置数据源与连接池
<!--Spring与MyBatis的整合配置-->
<!--配置数据源-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<!--这里的value在mysql8.0以后要使用com.mysql.cj.jdbc.Driver-->
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url"
value="jdbc:mysql://localhost:3306/imooc_reader?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
<!--initialSize指定数据库连接池在初始化时创建几个连接-->
<property name="initialSize" value="5"/>
<!--maxActive设置同时访问人数的峰值-->
<property name="maxActive" value="20"/>
</bean>
配置SqlSessionFactory对象
<!--SqlSessionFactoryBean用于根据配置信息创建SqlSessionFactory,不再需要手动创建-->
<bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="mapperLocations" value="classpath:mappers/*.xml"/>
</bean>
配置Mapper扫描器和mybatis配置文件地址
<!--SqlSessionFactoryBean用于根据配置信息创建SqlSessionFactory,不再需要手动创建-->
<bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="mapperLocations" value="classpath:mappers/*.xml"/>
<!--mybatis配置文件地址-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!--配置Mapper扫描器-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.imooc.reader.mapper"/>
</bean>
创建mybatis-config.xml
<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http//mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--开启驼峰命名映射-->
<settings>
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
</configuration>
3.Spring与其他组件整合
在SSM整合中,除了上述基础框架的整合外,还需额外整合三方面内容
配置logback日志输出 配置声明式事务 整合JUnit单元测试
在配置之前先将applicationContext.xml的schema文档替换掉
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mv="http://www.springframework.org/schema/mvc" xmlns:task="http://www.springframework.org/schema/task" 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/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
Spring整合JUnit单元测试
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<!--单元测试依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.3.17</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
Spring整合logback
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<!--logback依赖-->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
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<?xml version="1.0" encoding="UTF-8" ?>
<configuration>
<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<!--pattern规定日志输出格式-->
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
<charset>UTF-8</charset>
</encoder>
</appender>
<root level="debug">
<appender-ref ref="console"/>
</root>
</configuration>
Spring配置声明式事务
首先检查是否存在spring-tx包,然后在applicationContext.xml中配置声明式事务
<!--声明式事务配置-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
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