Spring学习笔记：MVC框架整合

1、搭建开发环境

  <dependencies>
    <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>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.1</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>

    <!--	整合log4j  |  屏蔽默认的日志框架	-->
    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.25</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/log4j/log4j -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.19</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjrt -->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
      <version>1.9.5</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.9.5</version>
    </dependency>

    <!--mysql驱动 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.19</version>
    </dependency>
    <!-- mybatis依赖-->
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.4</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.3</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.22</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>
  </dependencies>

实际上Spring-webmvc的依赖，因为已经包含了Spring-web了

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");
	--->  替换为				  WebXmlApplicationContext()
        
2.如何保证工厂唯一且同时被共用
        
	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.xm1");

	怎么知道ServletContext对象什么时候创建 ---> 监听器:
		ServletContextListener 
    		---> ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xm1");
		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。

最后

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