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截止目前，同学们一共提了 132452个问题

老师，我这是怎么回事，怎么显示不出来呢？

Python 全系列/第一阶段：Python入门/控制语句 35746楼

老师，您好

import turtle
turtle.showturtle()
turtle.write("刘秋裤")
#下面是划直线
turtle.left(45)
#下面是更改线条颜色
turtle.color("black")
turtle.forward(100)
turtle.left(45)
turtle.forward(50)
turtle.left(90)
turtle.forward(25)
turtle.left(90)
turtle.forward(50)
turtle.penup()
turtle.goto(0,0)
turtle.left(-135)
#我想换个方位画出100的线条，可是画不出来了，这是什么问题
#turtle.(-100,100)我也试过了，但是没出线
#turtle(重新赋予线的颜色也不行）
turtle.forward(100)

Python 全系列/第一阶段：Python入门/Python入门（动画版） 35747楼

老师这里为啥我的admin的css样式没有起作用啊，centos执行过：合并静态文件的命令

这是nginx.conf

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
# include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
	accept_mutex on;
	multi_accept on;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
	sendfile_max_chunk 100k;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  localhost;
        root         /usr/share/nginx/html;
		charset utf-8;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location / {
			proxy_http_version 1.1;
			proxy_set_header Connection "";
			include uwsgi_params;
			uwsgi_pass 127.0.0.1:8997;
			uwsgi_send_timeout 60;
			uwsgi_connect_timeout 60;
			uwsgi_read_timeout 60;
        }
		
		location /static/ {
			# 执行 collectstatic 合并静态文件之后的目录
			alias /var/www/django15/static/;
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
			root html;
        }
    }

# Settings for a TLS enabled server.
#
#    server {
#        listen       443 ssl http2 default_server;
#        listen       [::]:443 ssl http2 default_server;
#        server_name  _;
#        root         /usr/share/nginx/html;
#
#        ssl_certificate "/etc/pki/nginx/server.crt";
#        ssl_certificate_key "/etc/pki/nginx/private/server.key";
#        ssl_session_cache shared:SSL:1m;
#        ssl_session_timeout  10m;
#        ssl_ciphers PROFILE=SYSTEM;
#        ssl_prefer_server_ciphers on;
#
#        # Load configuration files for the default server block.
#        include /etc/nginx/default.d/*.conf;
#
#        location / {
#        }
#
#        error_page 404 /404.html;
#            location = /40x.html {
#        }
#
#        error_page 500 502 503 504 /50x.html;
#            location = /50x.html {
#        }
#    }

}

Python 全系列/第十二阶段：Python_Django3框架/Django高级 35748楼

老师帮忙看看什么问题：

parent2.zip

该检查的都检查了

每次代码更改都install了

zookeeper开启了

防火墙也关了

timeout=30000

找了半天不知道问题在哪

provider能连接，但是zookeeper中没有节点生成

[INFO] Scanning for projects...

[INFO]

[INFO] --------------------------< com.ghl:consumer >--------------------------

[INFO] Building consumer 0.0.1-SNAPSHOT

[INFO] --------------------------------[ war ]---------------------------------

[INFO]

[INFO] >>> tomcat7-maven-plugin:2.2:run (default-cli) > process-classes @ consumer >>>

[INFO]

[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ consumer ---

[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] Copying 3 resources

[INFO]

[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ consumer ---

[INFO] Changes detected - recompiling the module!

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

[INFO] Compiling 3 source files to /Users/tui/eclipse-workspace/parent2/consumer/target/classes

[INFO]

[INFO] <<< tomcat7-maven-plugin:2.2:run (default-cli) < process-classes @ consumer <<<

[INFO]

[INFO] --- tomcat7-maven-plugin:2.2:run (default-cli) @ consumer ---

[INFO] Running war on http://localhost:8080/

[INFO] Creating Tomcat server configuration at /Users/tui/eclipse-workspace/parent2/consumer/target/tomcat

[INFO] create webapp with contextPath:

1月 20, 2021 9:04:31 下午 org.apache.coyote.AbstractProtocol init

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

1月 20, 2021 9:04:31 下午 org.apache.catalina.core.StandardService startInternal

信息: Starting service Tomcat

1月 20, 2021 9:04:31 下午 org.apache.catalina.core.StandardEngine startInternal

信息: Starting Servlet Engine: Apache Tomcat/7.0.47

1月 20, 2021 9:04:34 下午 org.apache.catalina.core.ApplicationContext log

信息: No Spring WebApplicationInitializer types detected on classpath

1月 20, 2021 9:04:34 下午 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.

WARNING: An illegal reflective access operation has occurred

WARNING: Illegal reflective access by javassist.ClassPool (file:/Users/tui/m2/repository/org/javassist/javassist/3.20.0-GA/javassist-3.20.0-GA.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)

WARNING: Please consider reporting this to the maintainers of javassist.ClassPool

WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations

WARNING: All illegal access operations will be denied in a future release

1月 20, 2021 9:05:10 下午 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.BeanCreationException: Error creating bean with name 'demoServiceImpl': Injection of @Reference dependencies is failed; nested exception is java.lang.IllegalStateException: zookeeper not connected

at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.postProcessPropertyValues(AbstractAnnotationBeanPostProcessor.java:146)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1427)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:882)

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)

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.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)

at java.base/java.lang.Thread.run(Thread.java:832)

Caused by: java.lang.IllegalStateException: zookeeper not connected

at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:83)

at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26)

at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:70)

at org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java)

at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.<init>(ZookeeperDynamicConfiguration.java:70)

at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:37)

at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.lambda$getDynamicConfiguration$0(AbstractDynamicConfigurationFactory.java:39)

at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708)

at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:39)

at org.apache.dubbo.common.config.configcenter.DynamicConfiguration.getDynamicConfiguration(DynamicConfiguration.java:223)

at org.apache.dubbo.config.bootstrap.DubboBootstrap.prepareEnvironment(DubboBootstrap.java:857)

at org.apache.dubbo.config.bootstrap.DubboBootstrap.startConfigCenter(DubboBootstrap.java:603)

at org.apache.dubbo.config.bootstrap.DubboBootstrap.useRegistryAsConfigCenterIfNecessary(DubboBootstrap.java:671)

at org.apache.dubbo.config.bootstrap.DubboBootstrap.initialize(DubboBootstrap.java:509)

at org.apache.dubbo.config.bootstrap.DubboBootstrap.init(DubboBootstrap.java:494)

at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:190)

at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:158)

at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.getOrCreateProxy(ReferenceAnnotationBeanPostProcessor.java:274)

at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:143)

at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.getInjectedObject(AbstractAnnotationBeanPostProcessor.java:359)

at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor$AnnotatedFieldElement.inject(AbstractAnnotationBeanPostProcessor.java:539)

at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)

at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.postProcessPropertyValues(AbstractAnnotationBeanPostProcessor.java:142)

... 22 more

Caused by: java.lang.IllegalStateException: zookeeper not connected

at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:80)

... 44 more

1月 20, 2021 9:05:10 下午 org.apache.catalina.core.StandardContext startInternal

严重: Error listenerStart

1月 20, 2021 9:05:10 下午 org.apache.catalina.core.StandardContext startInternal

严重: Context [] startup failed due to previous errors

1月 20, 2021 9:05:10 下午 org.apache.catalina.core.ApplicationContext log

信息: Closing Spring root WebApplicationContext

1月 20, 2021 9:05:10 下午 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

严重: The web application [] appears to have started a thread named [Curator-ConnectionStateManager-0] but has failed to stop it. This is very likely to create a memory leak.

1月 20, 2021 9:05:10 下午 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

严重: The web application [] appears to have started a thread named [localhost-startStop-1-SendThread(192.168.56.5:2181)] but has failed to stop it. This is very likely to create a memory leak.

1月 20, 2021 9:05:10 下午 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

严重: The web application [] appears to have started a thread named [localhost-startStop-1-EventThread] but has failed to stop it. This is very likely to create a memory leak.

1月 20, 2021 9:05:10 下午 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

严重: The web application [] appears to have started a thread named [Curator-Framework-0] but has failed to stop it. This is very likely to create a memory leak.

1月 20, 2021 9:05:10 下午 org.apache.coyote.AbstractProtocol start

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

1月 20, 2021 9:05:10 下午 org.apache.catalina.loader.WebappClassLoader loadClass

信息: Illegal access: this web application instance has been stopped already. Could not load org.apache.zookeeper.Watcher$Event$EventType. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.

java.lang.IllegalStateException

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1588)

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)

at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1176)

JAVA 全系列/第十一阶段：分布式RPC调用和分布式文件存储/Dubbo 35749楼

The environment variable 'flask_setting' is not set and as such configuration could not be loaded. Set this variable and make it point to a configuration file

未设置环境变量“flask_setting ”,因此无法加载配置。设置此变量，并使其指向一个配置文件

我设置了还是不行

Python 全系列/第八阶段：轻量级Web开发利器-Flask框架/Flask视图基础和URL 35750楼

老师，创建了环境变量，然后创建的虚拟环境总是在C盘里创建呢

Python 全系列/第十二阶段：Python_Django3框架/Django初级 35751楼

完结撒花.......................................

JAVA 全系列/第五阶段：JavaWeb开发/Web实战案例 35752楼

老师为什么我执行第二步的时候报了下面的错误？

JAVA 全系列/第二十三阶段：容器管理技术/Docker 35753楼

老师，这个咋显示连不上.......................

JAVA 全系列/第八阶段：Linux入门到实战/Linux（旧） 35754楼

<context-param>标签有啥用法呀，为啥该方法可以读取 web.xml 文件中<context-param>标签中的配置信息，但是不读取servlet标签信息，目前还不太了解<context-param>的用途

JAVA 全系列/第五阶段：JavaWeb开发/Servlet技术详解（旧） 35755楼

这个jdk是什么版本都可以吗？现在zookeeper的最高版本是3.8.0.

jdk11可以吗？

JAVA 全系列/第十二阶段：Spring Cloud Alibaba技术栈/Zookeeper 35756楼

老师，实际开发是不是要判断一下上传文件是不是为空

JAVA 全系列/第六阶段：项目管理与SSM框架/SpringMVC 35757楼

/*
* 生成动态条件查询sql
* */
private String generateSql(Users users){
    StringBuffer sb = new StringBuffer("select * from users where 1=1  ");
    if (users.getUserid()>0){
        sb.append("and userid =").append(users.getUserid());
    }
    if (users.getUsername() !=null && users.getUsername().length()>0){
        sb.append(" and username = ").append(users.getUsername()).append("");
    }
    if (users.getUserage()>0){
        sb.append(" and userage = ").append(users.getUserage());
    }
    return sb.toString();
}

public static void main(String[] args) {
    DynamicConditionQueryTest dc = new DynamicConditionQueryTest();
    Users  users = new Users();
    users.setUsername("sack");
    //users.setUserage(15);
   List<Users> list = dc.queryUser(users);
   for (Users users1:list){
       System.out.println(users1.getUserid()+""+users1.getUsername()+""+users1.getUserage());
   }
}

l老师，我单独查找号码能查到数据库中的数，但是我单独查找这个人名咋报错了啊，是不是要把那个1=1改一下啊

JAVA 全系列/第三阶段：数据库编程/JDBC技术 35758楼

老是报这个错误：

我都把 server.xml中的第二个<user>注释了还是报这个错误，为啥啊？

JAVA 全系列/第十八阶段：亿级高并发电商项目_架构/编码（旧）/电商：基于MyCat实现分库分表和读写分离 35759楼

老师请问我这个为什么显示系统找不到指定的路径

Python 全系列/第二阶段：Python 深入与提高/文件处理 35760楼

同学您好