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

让Junit通知spring加载配置文件

让spring容器自动进行注入

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

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
```

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

修改web.xml

<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>

servlet中调用

// 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());