Spring一套全通5—SSM整合

百知教育 — Spring系列课程 — MVC框架整合

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第一章、MVC框架整合思想

1. 搭建Web运行环境

<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>3.1.0</version>
  <scope>provided</scope>
</dependency>

<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>jstl</artifactId>
  <version>1.2</version>
</dependency>

<!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
<dependency>
  <groupId>javax.servlet.jsp</groupId>
  <artifactId>javax.servlet.jsp-api</artifactId>
  <version>2.3.1</version>
  <scope>provided</scope>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-web</artifactId>
  <version>5.1.14.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-core</artifactId>
  <version>5.1.14.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-beans</artifactId>
  <version>5.1.14.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-tx</artifactId>
  <version>5.1.14.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jdbc</artifactId>
  <version>5.1.14.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis-spring</artifactId>
  <version>2.0.2</version>
</dependency>

<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>1.1.18</version>
</dependency>

<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.48</version>
</dependency>

<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.4.6</version>
</dependency>

<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.11</version>
  <scope>test</scope>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>5.1.4.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-aop</artifactId>
  <version>5.1.14.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.aspectj</groupId>
  <artifactId>aspectjrt</artifactId>
  <version>1.8.8</version>
</dependency>

<dependency>
  <groupId>org.aspectj</groupId>
  <artifactId>aspectjweaver</artifactId>
  <version>1.8.3</version>
</dependency>

<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-log4j12</artifactId>
  <version>1.7.25</version>
</dependency>

<dependency>
  <groupId>log4j</groupId>
  <artifactId>log4j</artifactId>
  <version>1.2.17</version>
</dependency>

2. 为什么要整合MVC框架

1. MVC框架提供了控制器(Controller)调用Service
   DAO ---》 Service
2. 请求响应的处理
3. 接受请求参数 request.getParameter("")
4. 控制程序的运行流程
5. 视图解析 (JSP JSON Freemarker Thyemeleaf )

3. Spring可以整合那些MVC框架

1. struts1
2. webwork
3. jsf
4. struts2
5. springMVC

4.Spring整合MVC框架的核心思路

1. 准备工厂

1. Web开发过程中如何创建工厂
      ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");
                                   WebXmlApplicationContext()
2. 如何保证工厂唯一同时被共用
   被共用：Web request|session|ServletContext(application)
   工厂存储在ServletContext这个作用域中 ServletContext.setAttribute("xxxx",ctx);

   唯一：ServletContext对象 创建的同时 ---》 ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");

        ServletContextListener ---> ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");
        ServletContextListener 在ServletContext对象创建的同时，被调用(只会被调用一次) ，把工厂创建的代码，写在ServletContextListener中，也会保证只调用
        一次，最终工厂就保证了唯一性
 3. 总结
      ServletContextListener(唯一)
             ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");
             ServletContext.setAttribute("xxx",ctx) (共用)

 4. Spring封装了一个ContextLoaderListener
     1. 创建工厂
     2. 把工厂存在ServletContext中

ContextLoaderListener使用方式 

web.xml

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
</context-param>

2. 代码整合

依赖注入：把Sevice对象注入个控制器对象。

第二章、Spring与Struts2框架整合 (选学)

1. Spring与Struts2整合思路分析

1. Struts2中的Action需要通过Spring的依赖注入获得Service对象。

2. Spring与Struts2整合的编码实现

• 搭建开发环境

  • 引入相关jar (Spring Struts2)

    <dependency>
      <groupId>org.apache.struts</groupId>
      <artifactId>struts2-spring-plugin</artifactId>
      <version>2.3.8</version>
    </dependency>
    

  • 引入对应的配置文件

    • applicationContext.xml
    • struts.xml
    • log4j.properties

  • 初始化配置

    <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    
    <filter>
      <filter-name>struts2</filter-name>
      <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
      <filter-name>struts2</filter-name>
      <url-pattern>/*</url-pattern>
    </filter-mapping>
    

    • Spring (ContextLoaderListener —> Web.xml)
    • Struts2(Filter —> Web.xml)

• 编码

  • 开发Service对象

    最终在Spring配置文件中创建Service对象
    <bean id="userService" class="com.baizhi.struts2.UserServiceImpl"/>
    

  • 开发Action对象

    • 开发类

      public class RegAction implements Action{
         private UserService userService;
         set get
      
         public String execute(){
             userService.register();
             return Action.SUCCESS;
         }
      }
      

    • Spring (applicationContext.xml)

      <bean id="regAction" class="com.baizhi.struts2.RegAction" scope="prototype">
          <property name="userService" ref=""/>
      </bean
      

    • Struts2(struts.xml)

      <package name="ssm" extends="struts-default">
        url reg.action  ---> 会接受到用户的请求后，创建RegAction这个类的对象 进行相应的处理
      
        <action name="reg" class="regAction">
          <result name="success">/index.jsp</result>
        </action>
      </package>
      

3. Spring+Struts2+Mybatis整合(SSM)

1. 思路分析

SSM = Spring+Struts2  Spring+Mybatis

2. 整合编码

• 搭建开发环境

  • 引入相关jar (Spring Struts2 Mybatis)

    
        <dependency>
          <groupId>org.apache.struts</groupId>
          <artifactId>struts2-spring-plugin</artifactId>
          <version>2.3.8</version>
        </dependency>
    
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>3.1.0</version>
          <scope>provided</scope>
        </dependency>
    
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>jstl</artifactId>
          <version>1.2</version>
        </dependency>
    
        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
        <dependency>
          <groupId>javax.servlet.jsp</groupId>
          <artifactId>javax.servlet.jsp-api</artifactId>
          <version>2.3.1</version>
          <scope>provided</scope>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-web</artifactId>
          <version>5.1.14.RELEASE</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-core</artifactId>
          <version>5.1.14.RELEASE</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-beans</artifactId>
          <version>5.1.14.RELEASE</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-tx</artifactId>
          <version>5.1.14.RELEASE</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-jdbc</artifactId>
          <version>5.1.14.RELEASE</version>
        </dependency>
    
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis-spring</artifactId>
          <version>2.0.2</version>
        </dependency>
    
        <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>druid</artifactId>
          <version>1.1.18</version>
        </dependency>
    
        <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>5.1.48</version>
        </dependency>
    
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis</artifactId>
          <version>3.4.6</version>
        </dependency>
    
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.11</version>
          <scope>test</scope>
        </dependency>
    
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>5.1.4.RELEASE</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-aop</artifactId>
          <version>5.1.14.RELEASE</version>
        </dependency>
    
        <dependency>
          <groupId>org.aspectj</groupId>
          <artifactId>aspectjrt</artifactId>
          <version>1.8.8</version>
        </dependency>
    
        <dependency>
          <groupId>org.aspectj</groupId>
          <artifactId>aspectjweaver</artifactId>
          <version>1.8.3</version>
        </dependency>
    
        <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-log4j12</artifactId>
          <version>1.7.25</version>
        </dependency>
    
        <dependency>
          <groupId>log4j</groupId>
          <artifactId>log4j</artifactId>
          <version>1.2.17</version>
        </dependency>
    
    

  • 引入对应的配置文件

    • applicationContext.xml
    • struts.xml
    • log4j.properties
    • xxxxMapper.xml

  • 初始化配置

    • Spring (ContextLoaderListener —> Web.xml)

    • Struts2(Filter —> Web.xml)

    <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    
    <filter>
      <filter-name>struts2</filter-name>
      <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
    <filter-name>struts2</filter-name>
      <url-pattern>/*</url-pattern>
    </filter-mapping>
    

• 编码

  • DAO (Spring+Mybatis)

    1. 配置文件的配置
       1. DataSource
       2. SqlSessionFactory ----> SqlSessionFactoryBean
          1. dataSource
          2. typeAliasesPackage
          3. mapperLocations
       3. MapperScannerConfigur ---> DAO接口实现类
    2. 编码
       1. entity
       2. table
       3. DAO接口
       4. 实现Mapper文件
    

  • Service (Spring添加事务)

    1. 原始对象 ---》 注入DAO
    2. 额外功能 ---》 DataSourceTransactionManager ---> dataSource
    3. 切入点 + 事务属性
       @Transactional(propagation,readOnly...)
    4. 组装切面
       <tx:annotation-driven
    

  • Controller (Spring+Struts2)

    1. 开发控制器 implements Action 注入Service
    2. Spring的配置文件
        1. 注入 Service
        2. scope = prototype
    3. struts.xml
        <action class="spring配置文件中action对应的id值"/>
    

4. Spring开发过程中多配置文件的处理

Spring会根据需要，把配置信息分门别类的放置在多个配置文件中，便于后续的管理及维护。

DAO  ------  applicationContext-dao.xml
Service ---  applicationContext-service.xml
Action  ---  applicationContext-action.xml

注意：虽然提供了多个配置文件，但是后续应用的过程中，还要进行整合

• 通配符方式

  1. 非web环境
     ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext-*.xml");
  2. web环境
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:applicationContext-*.xml</param-value>
     <context-param>
  

• <import标签

  applicationContext.xml 目的 整合其他配置内容
      <import resource="applicationContext-dao.xml " />
      <import resource="applicationContext-service.xml " />
      <import resource="applicationContext-action.xml " />
  
  1. 非web环境
     ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");
  2. web环境
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:applicationContext.xml</param-value>
     <context-param>