Spring5.x专栏（学习） - Spring系列课程（5） — MVC框架整合 - 《Java、Shell 专栏》

第一章、MVC框架整合思想
第二章、Spring与Struts2框架整合 (选学)

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 ```xml org.springframework.web.context.ContextLoaderListener

contextConfigLocation classpath:applicationContext.xml

struts2 org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

struts2 /*


      - Spring (ContextLoaderListener —> Web.xml)
      - Struts2(Filter —> Web.xml)
- 编码
   - 开发Service对象
```markdown
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 ```java public class RegAction implements Action{ private UserService userService; set get
public String execute(){ userService.register(); return Action.SUCCESS; } }
```
 - Spring (applicationContext.xml)
```markdown
<bean id="regAction" class="com.baizhi.struts2.RegAction" scope="prototype">
<property name="userService" ref=""/>
</bean
```
- Struts2(struts.xml) ```xml 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
/index.jsp ```

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) ```xml

<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)
```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) ```markdown

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
编码
1. entity
2. table
3. DAO接口
4. 实现Mapper文件 ```
- Service (Spring添加事务) ```markdown
原始对象 —-》注入DAO
额外功能 —-》 DataSourceTransactionManager —-> dataSource
切入点 + 事务属性 @Transactional(propagation,readOnly…)
组装切面 <tx:annotation-driven ```
- Controller (Spring+Struts2) ```markdown
开发控制器 implements Action 注入Service
Spring的配置文件
1. 注入 Service
2. scope = prototype
struts.xml ```

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 ```markdown

非web环境 ApplicationContext ctx = new ClassPathXmlApplicationContext(“/applicationContext-*.xml”);

web环境

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

```

非web环境 ApplicationContext ctx = new ClassPathXmlApplicationContext(“/applicationContext.xml”);

web环境

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

```