有效沟通问答-【官方】百战程序员_IT在线教育培训机构

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		
		<style>
			body{
				background-image: url('https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1598617000259&di=b5d1d7f84e70922515532e9c6bc244fb&imgtype=0&src=http%3A%2F%2Fdingyue.ws.126.net%2F2019%2F04%2F19%2Ff76caccfae3e4aafb92d364be54a9ecc.jpeg');
				background-repeat: no-repeat;
				background-size: 1600px 600px;
			}
			
			a{
				font-size: 25px;
				color: white;
			}
		</style>
		
		<script>
			var i=0;
			function changebg(){
				var arr=['https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=3100633070,1670184186&fm=26&gp=0.jpg','https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1598617671920&di=7aa4cb05c00361f2b49b8b4e0f9fd635&imgtype=0&src=http%3A%2F%2F5b0988e595225.cdn.sohucs.com%2Fq_70%2Cc_zoom%2Cw_640%2Fimages%2F20180613%2F09a3850ee4664b9c931332145bbb0a6f.jpeg','https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1598617736788&di=3db9d05a043556b456d1d2e3fac78f29&imgtype=0&src=http%3A%2F%2Fimgsrc.baidu.com%2Fforum%2Fw%3D580%2Fsign%3D453287f400d162d985ee621421dfa950%2Fb6ecf803918fa0ec4fc0ad3d2c9759ee3d6ddbbc.jpg','https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1598617793589&di=7c942654f5bdedbca95daa62ab6c1155&imgtype=0&src=http%3A%2F%2Fp2.ssl.cdn.btime.com%2Ft01cc72054bb0448dde.jpg%3Fsize%3D608x339','https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1598617841695&di=933b600e0fe543f0c9da939aa914187f&imgtype=0&src=http%3A%2F%2Fimage.uc.cn%2Fs%2Fwemedia%2Fs%2Fupload%2F2018%2F385682cf36990962c0843fe03c174c73.jpg','https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=1250876743,1234586165&fm=26&gp=0.jpg','https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=2569621119,693892286&fm=26&gp=0.jpg']
				
				if(i<arr.length-1){
					i++;
				}else{
					i=0;
				}
				
				document.body.style.backgroundImage='url(arr[i])'
			}
		</script>
		
	</head>
	<body>
		
		<a href="javascript:changebg()">点击更换主题</a>
		
	</body>
</html>

Python 全系列/第七阶段：网页编程基础/JavaScript 30002楼

老师为什么我登录的时候intelliJ会提示下面的异常？不知道哪里会time out或者为什么会time out呢。。完全没有头绪啊。。

java.net.ConnectException: Operation timed out (Connection timed out)

at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.8.0_211]

at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_211]

at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_211]

at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_211]

at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_211]

at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_211]

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_211]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_211]

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_211]

JAVA 全系列/第二十二阶段：分布式医疗云平台/系统管理前后端开发（旧） 30003楼

老师，Mac 版本的网络助手怎么用呢？需要填目标IP和目标端口吗？

Python 全系列/第三阶段：Python 网络与并发编程/网络通信 30004楼

运行代码：

from tkinter import *
from PIL import Image, ImageTk
import random


class Application(Frame):

    def __init__(self, master=None):
        super().__init__(master)
        self.master = master
        self.pack()
        self.createWidget()

    def createWidget(self):
        self.btn1 = Button(self, text='送', command=self.song)
        self.btn1.pack()
        self.btnquit = Button(self, text='退出', command=root.destroy, bg='red', fg='blue')
        self.btnquit.pack()

    def get_picture(self, filepath):
        img = Image.open(filepath)
        pic = ImageTk.PhotoImage(img)
        return pic

    def set_picture(self):
        flowers = self.get_picture('flower1.jpg')
        money = self.get_picture('money1.jpg')
        shit = self.get_picture('shit1.jpg')
        book = self.get_picture('book1.jpg')
        phone = self.get_picture('phone1.jpg')
        clothes = self.get_picture('clothes1.jpg')
        song_list = [flowers, money, shit, book, phone, clothes]
        number = random.randint(0, 5)
        return song_list[number]

    def song(self):
        global photo
        photo = self.set_picture()
        self.labpic = Label(self, image=photo)
        self.labpic.pack()


if __name__ == '__main__':
    root = Tk()
    root.geometry('800x600+200+200')
    root.title('首个tk')
    app = Application(master=root)
    root.mainloop()

运行截图：

点击送第二次的时候图片会在第一个图的下面，点击送第三次的时候就看不到图片了

请问能不能每次点击送的时候图片都在正中间？

Python 全系列/第二阶段：Python 深入与提高/GUI编程（隐藏） 30005楼

老师，long类型的数能自动转化成float类型的数吗？

JAVA 全系列/第一阶段：AI驱动的JAVA编程/变量、数据类型、运算符 30006楼

老师，当我查看网页源码时，点击js/jquery.js时发现报404错误

JAVA 全系列/第六阶段：JavaWeb开发/Ajax技术详解（旧） 30007楼

老师我和上面那个兄弟遇到的问题一模一样，路径也没问题，应该也是静态资源放行出现问题了，于是我在web.xml中配置了以下内容，实现效果如下，干啥不对啊，重启Tomcat默认页面就显示 Hello JQuery Ajax，访问jqueryAjaxDemo.jsp也是显示 Hello JQuery Ajax，我在网上看到都是SpringMVC静态资源的问题，我们现在学的应该不是这个框架吧，请老师给一个解决方案

JAVA 全系列/第六阶段：JavaWeb开发/Ajax技术详解（旧） 30008楼

请问老师相关软件那个文件夹去哪里下载啊.

JAVA 全系列/第一阶段：AI驱动的JAVA编程/JAVA入门和背景知识 30009楼

我这里有个疑问,subject.isAuthenticated()这个方法用来判断验证是否成功,当用户名密码正确时,会走if输出登录成功,没有问题,但是当用户名密码错误时,在subject.login(token)这个方法就会报未知账户异常,else里的代码是不会执行的,这样的话在验证登录是否成功就不能用这个if,else了呀

JAVA 全系列/第十阶段：权限控制与安全认证/Shiro（旧） 30010楼

这里要发送code换token，可是后端那里显示token:null是什么原因,appid和AppSecret都给后端输上了。

WEB前端全系列/第十三阶段：微信小程序-安心食疗（旧）/安心食疗-授权登录 30011楼

老师，这个0.001s的时间是代码运行到哪里的时间呢

Python 全系列/第三阶段：Python 网络与并发编程/并发编程 30012楼

老师，请问，这里的f是什么意思，必须要加上的吗

Python 全系列/第三阶段：Python 网络与并发编程/并发编程 30013楼

老师，这章节的项目部署和Python_django2框架中的安装的Nginx和uwsgi里面的配置会不会冲突呀，python_django2框架里uwsgi配置了软连接，和启动脚本，这个会和当前章节的项目部署中的uwsgi产生出图吗？

然后就是nginx.conf这个配置文件两个章节也是不同的，每次都需要修改吗？

Python 全系列/下架-第十二阶段：Python_大型电商项目（5天后下架）/Django项目阶段-电商项目（旧） 30014楼

构造器怎么不能定义了，按着视频里面一步一步敲得

JAVA 全系列/第一阶段：AI驱动的JAVA编程/飞机大战小项目训练 30015楼

同学您好