Spring5学习笔记4——MVC框架整合

第四部分：MVC框架整合

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

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

3. Spring可以整合哪些MVC框架?

struts1
webwork
jsf
struts2
springMVC

4. Spring整合MVC框架的核心思路

4.1 web环境下的工厂创建：

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 WebXmlApplicationContext("/applicationContext.xml");
       
        ServletContextListener ---> ApplicationContext ctx = new WebXmlApplicationContext("/applicationContext.xml");
        ServletContextListener 在ServletContext对象创建的同时，被调用(且只会被调用一次) ，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 WebXmlApplicationContext("/applicationContext.xml");
             ServletContext.setAttribute("xxx",ctx) (共用)
             
 4. Spring封装了一个ContextLoaderListener实现了ServletContextListener接口，它有以下作用：
     1. 创建工厂。
     2. 把工厂存在ServletContext域中。
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<!-- 在web.xml中配置ContextLoaderListener -->

<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>

4.2 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：

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

1 2	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)

1
2
3

<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

1	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)

<!-- 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
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

实战中会根据需要，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中添加以下标签：（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>