PDF文档从9.1.3自定义泛型直接到 Collection接口,缺失了下图这部分的
一、问题
方式2 这种方法如果在两个包下面有一样名字的类，且两个包都取了别名咋办？
老师给的tomcat9是只支持Windows的吗？我用的Mac是不是要自己去官网下载？
启动两个springboot都正常，网页上一访问就出现这个错误了，能帮忙看下吗？
java.lang.IllegalArgumentException: Invoked method public abstract void jakarta.servlet.http.HttpSession.setAttribute(java.lang.String,java.lang.Object) is no accessor method! at org.springframework.data.projection.Accessor.<init>(Accessor.java:50) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE] at org.springframework.data.projection.MapAccessingMethodInterceptor.invoke(MapAccessingMethodInterceptor.java:55) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE] at org.springframework.data.projection.ProjectingMethodInterceptor.invoke(ProjectingMethodInterceptor.java:64) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.data.projection.ProxyProjectionFactory$TargetAwareMethodInterceptor.invoke(ProxyProjectionFactory.java:245) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE] at com.sun.proxy.$Proxy72.setAttribute(Unknown Source) ~[na:na] at com.lin.session.test.controller.WebController.setMsg(WebController.java:13) ~[classes/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_261] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_261] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_261] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_261] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:151) ~[spring-session-core-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:81) ~[spring-session-core-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) [tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.21.jar:9.0.21] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_261] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_261] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.21.jar:9.0.21] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_261]
那个node安装在了c盘，然后这里显示没有脚本，应该怎么做呢？
这三个文件什么情况下才会有出现的？需要将前后台的那些软件都安装好才有？
前端的代码有吗？在哪里能找得到？还没有写前端代码，也可以一样跟着这个视频一步一步操作？
老师，这里终止为什么是0呢，还有步长是-1也不太懂
老师您好，我在用jupyter记笔记时，出现一个问题，就是del在各IDE上的运行结果不一样，就有点搞不懂他们都是什么意思了，您看看我下面理解的都对吗。
原码
#构造函数 class Person: def __del__(self): #一般不用写，系统自带 print("销毁对象：{0}".format(self)) p1 = Person() p2 = Person() del p2 print("程序结束")
pycharm
这个就是说p2用del删除，然后程序走完，把p1也释放了，程序结束。
jupyter notebook
第一运行
第二次运行
这个是不是就是第一次运行结束之后他没有打印出p1的删除，但他执行了，在第二次运行时，他把第一次运行，p1删除的结果打印出来了。
3.IDLE
ID
IDLE运行的结果始终是这样的，那其实他也是在运行结束后，把p1删了，只是他不会打印出来。
老师，请问，win7系统怎么查看是否开启了虚拟化呢
老师，我按照视频老师里面添加的jquery，操作不出来，有没有新的呀
老师，我想问下 我并没有像老师那样 操作什么环境变量啥的 也没有配置什么HOSTNAME 也正常启动了没问题吧
style> .box{ width: 234px; height: 300px; background-color: pink; position: relative; overflow: hidden; } .box1{ width: 100%; height: 76px; background-color: orange; /*绝对定位 相对于已经定位的父元素定位*/ position: absolute; /*据父元素上面的距离为300px*/ top: 300px; /*据父元素的左侧距离为0*/ left: 0px; } /*鼠标悬停在box上，子代box1*/ .box:hover>.box1{ /*据父元素上面的距离变为224*/ top: 224px; } .box2{ width: 303px; height: 375px; background-color: red; position: relative; } .box2>img{ width: 100%; height: 100%; } .box3{ width: 100%; height: 100%; background-color: salmon(0,0,0,.2); position: absolute; top: 0px; left: 303px; } .box2:hover>.box3{ left: 0; } </style> </head> <body> <div class="box"> <div class="box1"></div> </div> <div class="box2"> <img src="img/370ad36f-425c-453a-b406-ccb2a0dffeec.jpg" alt=""> <div class="box3"></div> </div> </body> </html>
老师，我这个代码哪里不对吗？为啥达不到老师说的效果
老师我的代码是按照视频里面敲的，但是运行的时候就会出错，只可以爬取几条数据，麻烦老师帮我看下子
from selenium import webdriver from time import sleep from lxml import etree # 构造浏览器 chrome = webdriver.Chrome() # 发送请求 url = 'https://search.jd.com/Search?keyword=%E7%AC%94%E8%AE%B0%E6%9C%AC&enc=utf-8&wq=%E7%AC%94%E8%AE%B0%E6%9C%AC&pvid=ce58b28b72ae48c190c8451125b8f894' chrome.get(url) # 拉动滚动条到底部，注意的是代码应该写在获取网页源码之前 js = 'document.documentElement.scrollTop=100000' chrome.execute_script(js) sleep(3) html = chrome.page_source e = etree.HTML(html) # titles = e.xpath('//div[@class="p-name p-name-type-2"]/a/em/text()') titles = e.xpath('//div[@id="J_goodsList"]//div[@class="p-name p-name-type-2"]/a/@title') prices = e.xpath('//div[@id="J_goodsList"]//div[@class="p-price"]/strong/i/text()') for title,price in zip(titles,prices): print(title,':',price) print(len(price)) chrome.quit()
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方式2 这种方法如果在两个包下面有一样名字的类，且两个包都取了别名咋办？
那个node安装在了c盘，然后这里显示没有脚本，应该怎么做呢？
这三个文件什么情况下才会有出现的？需要将前后台的那些软件都安装好才有？
ID
京公网安备 11011402011233号