老师，我这里install无法生成target目录，但是运行测试类就能生成这样子的目录，里面没有.xml文件

但是clean却能清除target目录，咋回事啊...

老师这是为什么，我保存的是d盘啊。我看了好多还是没有解决办法

这声音怎么回事儿？忽大忽小的、完全没法安心听课啊

老师它这个显示错误说无法解析方法login（）是什么问题

资料里面有误

这里下标2n应该改成n2

依据：

老师我这哪里错了

class MySingLeton:
    __obj = None
    __init_flag = True
    def __new__(cls,*args,**kwargs):
        if cls.__obj ==None:
            cls.__obj =object.__new__(cls)
         return cls.__obj

    def __init__(self,name):
        if MySingLeton.__init_flag:
        print("init------")
        self.name=name
        MySingLeton.__init_flag = False



a=MySingLeton("aa")
b=MySingLeton("bb")
print(a)
print(b)

老师，视频中把凹和凸弄反了，希望尽快矫正下。

分享，大学数学教材和课后习题参考答案

链接：https://pan.baidu.com/s/1HMYeqm_ZmYucnsCbQaAB5Q 

提取码：sp36 

dubbo远程调用服务

提供者使用@Service  //dubbo

   @Reference 消费服务  调用失败，

麻烦老师看看

测试调用提供者服务报以下错：连接超时

2020-09-14 17:39:32.425 ERROR 19208 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Filtered request failed.] with root cause

java.net.SocketTimeoutException: connect timed out
	at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_251]
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_251]
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_251]
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_251]
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_251]
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_251]
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_251]
	at java.net.Socket.connect(Socket.java:606) ~[na:1.8.0_251]
	at redis.clients.jedis.Connection.connect(Connection.java:181) ~[jedis-3.1.0.jar:na]
	at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:100) ~[jedis-3.1.0.jar:na]
	at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1866) ~[jedis-3.1.0.jar:na]
	at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:117) ~[jedis-3.1.0.jar:na]
	at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:889) ~[commons-pool2-2.7.0.jar:2.7.0]
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:424) ~[commons-pool2-2.7.0.jar:2.7.0]
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:349) ~[commons-pool2-2.7.0.jar:2.7.0]
	at redis.clients.jedis.util.Pool.getResource(Pool.java:50) ~[jedis-3.1.0.jar:na]
	at redis.clients.jedis.JedisPool.getResource(JedisPool.java:234) ~[jedis-3.1.0.jar:na]
	at org.crazycake.shiro.RedisManager.getJedis(RedisManager.java:35) ~[shiro-redis-3.2.3.jar:na]
	at org.crazycake.shiro.WorkAloneRedisManager.get(WorkAloneRedisManager.java:50) ~[shiro-redis-3.2.3.jar:na]
	at org.crazycake.shiro.RedisSessionDAO.doReadSession(RedisSessionDAO.java:152) ~[shiro-redis-3.2.3.jar:na]
	at org.apache.shiro.session.mgt.eis.AbstractSessionDAO.readSession(AbstractSessionDAO.java:168) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.session.mgt.DefaultSessionManager.retrieveSessionFromDataSource(DefaultSessionManager.java:236) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.session.mgt.DefaultSessionManager.retrieveSession(DefaultSessionManager.java:222) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.session.mgt.AbstractValidatingSessionManager.doGetSession(AbstractValidatingSessionManager.java:118) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.session.mgt.AbstractNativeSessionManager.lookupSession(AbstractNativeSessionManager.java:148) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.session.mgt.AbstractNativeSessionManager.getSession(AbstractNativeSessionManager.java:140) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.mgt.SessionsSecurityManager.getSession(SessionsSecurityManager.java:156) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.mgt.DefaultSecurityManager.resolveContextSession(DefaultSecurityManager.java:456) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.mgt.DefaultSecurityManager.resolveSession(DefaultSecurityManager.java:442) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.mgt.DefaultSecurityManager.createSubject(DefaultSecurityManager.java:338) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.subject.Subject$Builder.buildSubject(Subject.java:846) ~[shiro-core-1.3.2.jar:1.3.2]
	at org.apache.shiro.web.subject.WebSubject$Builder.buildWebSubject(WebSubject.java:148) ~[shiro-web-1.5.3.jar:1.5.3]
	at org.apache.shiro.web.servlet.AbstractShiroFilter.createSubject(AbstractShiroFilter.java:292) ~[shiro-web-1.5.3.jar:1.5.3]
	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:359) ~[shiro-web-1.5.3.jar:1.5.3]
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) ~[shiro-web-1.5.3.jar:1.5.3]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_251]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_251]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_251]

麻烦老师下载附件查看

from tkinter import * 

from tkinter import messagebox

请问老师，第一行已经用*导入，为什么第二行还需要单独导入messagebox ，是否是tkinter在封装模糊封装的时候，没有默认导入 messagebox呢?

老师，你把函数的凹凸性又弄反了，请尽快矫正一下

#测试label
#coding=utf-8
from tkinter import *
from tkinter import messagebox

class Application(Frame):
    def __init__(self,master=None):
        super().__init__(master)
        self.master = master
        self.pack()

        self.createWidget()

    def createWidget(self):
        self.label01 = Label(self,text = "用户名")
        self.label01.pack()

        v1 = StringVar
        self.entry01 = Entry(self,textvariable = v1)
        self.entry01.pack()
        v1.set("admin")

        self.btn01 = Button(self,text = "登录",command = self.login)
        self.btn01.pack()

    def login(self):
        messagebox.showinfo("尚学堂学习系统","登录成功")


root = Tk()
root.geometry("400x130+400+200")
app  =Application(master=root)
root.mainloop()

v1.set("admin")为啥不行

问题：

老师我一开始用命令设置时区，注销后，但是没有变化。

之后又用GUI设置还是没有变化。（注销后还是没变化）

老师，那shiro里的这个session和我们一起用的那个HttpSession是不是同一个对象，shiro里的session销毁了是不是这次会话的session也没了？那如果是销毁了我们以前创建的那种session那是不是shiro里的session也没了？