这是为什么呀？。。。。。。。。。。。。。。。。。。。。。。。。。。

老师，请问这里id=true具体是什么意思呢，能等于false吗

我想知道当我把字符串赋值给b，id地址得出来的数字是怎么换算出来的。

from urllib.request import Request, build_opener, ProxyHandler
from fake_useragent import UserAgent


url = 'http://httpbin.org/get'

headers = {"User-Agent": UserAgent().chrome}
req = Request(url, headers=headers)
#
handler = ProxyHandler({'http': '103.45.147.157:16817'})

opener = build_opener(handler)
resp = opener.open(req)
print(resp.read().decode())

老师 我这个proxy无论写什么都是返回主机的IP  空字符串也是本机IP  为什么？？

老师，上节课单向链表的时候，定义这个next属性，老师并没有在Node后面加<E>，这个不影响把？

老师，

问题一：如果temp是要删除元素的前一个元素，那么为什么不直接temp = getNode（index-1），这样不也是前一个元素吗？用for循环不是增加了时间复杂度吗？

问题二：为什么循环里面要用temp = temp.next?temp.next存的不是要删除元素的那个地址吗？既然要指向下一个元素，不是应该用temp = node.next（node指的是当前要删除元素）？

是不是也在catch块return EgoResult.error(“新增失败”)，才比较合理？

老师，我出现了下面的报错，请老师帮忙de一下bug

八月 06, 2021 11:34:56 上午 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["http-bio-8080"]

八月 06, 2021 11:34:56 上午 org.apache.catalina.core.StandardService startInternal

信息: Starting service Tomcat

八月 06, 2021 11:34:56 上午 org.apache.catalina.core.StandardEngine startInternal

信息: Starting Servlet Engine: Apache Tomcat/7.0.47

八月 06, 2021 11:34:58 上午 org.apache.catalina.core.ApplicationContext log

信息: No Spring WebApplicationInitializer types detected on classpath

八月 06, 2021 11:34:58 上午 org.apache.catalina.core.ApplicationContext log

信息: Initializing Spring root WebApplicationContext

log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).

log4j:WARN Please initialize the log4j system properly.

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

八月 06, 2021 11:34:59 上午 org.apache.catalina.core.StandardContext listenerStart

严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener

org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://dubbo.apache.org/schema/dubbo]

Offending resource: file [D:\JavaStudyMaterials\dubbo\consumer\target\classes\spring\applicationContext-dubbo.xml]

at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:72)

at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:119)

at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:111)

at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.error(BeanDefinitionParserDelegate.java:281)

at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1388)

at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1371)

at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:179)

at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:149)

at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:96)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:509)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:389)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:305)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:224)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:195)

at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)

at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)

at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:133)

at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:637)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:522)

at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401)

at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292)

at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)

at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:748)

八月 06, 2021 11:34:59 上午 org.apache.catalina.core.StandardContext startInternal

严重: Error listenerStart

八月 06, 2021 11:34:59 上午 org.apache.catalina.core.StandardContext startInternal

严重: Context [] startup failed due to previous errors

八月 06, 2021 11:34:59 上午 org.apache.catalina.core.ApplicationContext log

信息: Closing Spring root WebApplicationContext

八月 06, 2021 11:34:59 上午 org.apache.catalina.core.StandardContext listenerStop

严重: Exception sending context destroyed event to listener instance of class org.springframework.web.context.ContextLoaderListener

java.lang.IllegalStateException: BeanFactory not initialized or already closed - call 'refresh' before accessing beans via the ApplicationContext

at org.springframework.context.support.AbstractRefreshableApplicationContext.getBeanFactory(AbstractRefreshableApplicationContext.java:177)

at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1060)

at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1029)

at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:978)

at org.springframework.web.context.ContextLoader.closeWebApplicationContext(ContextLoader.java:517)

at org.springframework.web.context.ContextLoaderListener.contextDestroyed(ContextLoaderListener.java:112)

at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4980)

at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5626)

at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:748)

八月 06, 2021 11:34:59 上午 org.apache.coyote.AbstractProtocol start

信息: Starting ProtocolHandler ["http-bio-8080"]

老师你好

请问在本视频中，在自己创建的类中以SimpleDateFormat类名创建的对象，并使用这个时间类中的方法，这是不是组合？如果让自己建的类继承SimpleDateFormat是否可以用本类的对象来使用时间类的方法？

老师，在视频3:40的时候，那为啥之前的parent在加了mvc依赖的情况下还添加了context依赖

老师，对于v-if和v-show的理解。

v-if：当值为true的时候就进行页面渲染，fales的话就不渲染了。

v-show:基于css样式进行渲染，元素始终会被渲染并保留在 DOM 中，通过操作属性ture,fales进行显示和隐藏.

1.

do都和视频里的操作一样，为什么都报错

避坑：用qq浏览器能安装flash，完美解决Chrome不支持flash的问题！

老师，视频的2:40秒，为什么启动前还要安装一下啊

因为说的赋值的之前的，不确定之前的有没有安装Nginx的依赖，可以重新安装吗？？？？？？？？？？？？？？？？？？？？