spring入门-整合junit和web

整合Junit

• 导入jar包
  基本 ：4+1
  测试：spring-test-5.1.3.RELEASE.jar

1. 让Junit通知spring加载配置文件
2. 让spring容器自动进行注入
   

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   import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; (SpringJUnit4ClassRunner.class) @ContextConfiguration(locations="classpath:applicationContext.xml") public class { @Autowired private AccountService accountService; @Test public void demo() { accountService.transfer("jack", "rose", 1000); } }

整合web

• 导入jar
  spring-web-5.1.3.RELEASE.jar

1. tomcat启动加载配置文件
   servlet –> init(ServletConfig) –> 2
   filter –> init(FilterConfig) –> web.xml注册过滤器自动调用初始化
   listener –> ServletContextListener –> servletContext对象监听【】
   spring提供监听器 ContextLoaderListener –> web.xml 大专栏  spring入门-整合junit和webtener>….

   如果只配置监听器，默认加载xml位置：/WEB-INF/applicationContext.xml
   

2. 确定配置文件位置，通过系统初始化参数
   ServletContext 初始化参数 web.xml

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

代码

1. 修改web.xml

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   <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>

2. servlet中调用

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   // 从application作用域（ServletContext）获得spring容器 //方式1： 手动从作用域获取 ApplicationContext applicationContext = (ApplicationContext) this.getServletContext().getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE); //方式2：通过工具获取 ApplicationContext apppApplicationContext2 = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());