provider启动一次之后，zookeeper会永久保留数据。之后consumer调用时是否provider不需要再次启动？

老师，为什么我不能显示数据库的信息的呢？要怎么设置？

2020-03-14 16:33:59 [scrapy.utils.log] INFO: Scrapy 2.0.0 started (bot: rockstone)
2020-03-14 16:33:59 [scrapy.utils.log] INFO: Versions: lxml 4.5.0.0, libxml2 2.9.5, cssselect 1.1.0, parsel 1.5.2, w3lib 1.21.0, Twisted 19.10.0, Python 3.7.6 (tags/v3.7.6:43364
a7ae0, Dec 19 2019, 00:42:30) [MSC v.1916 64 bit (AMD64)], pyOpenSSL 19.1.0 (OpenSSL 1.1.1d  10 Sep 2019), cryptography 2.8, Platform Windows-10-10.0.18362-SP0
2020-03-14 16:33:59 [scrapy.utils.log] DEBUG: Using reactor: twisted.internet.selectreactor.SelectReactor
2020-03-14 16:33:59 [scrapy.crawler] INFO: Overridden settings:
{'BOT_NAME': 'rockstone',
 'NEWSPIDER_MODULE': 'rockstone.spiders',
 'ROBOTSTXT_OBEY': True,
 'SPIDER_MODULES': ['rockstone.spiders']}
2020-03-14 16:33:59 [scrapy.extensions.telnet] INFO: Telnet Password: 12ce7d6c067a2499
2020-03-14 16:33:59 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.logstats.LogStats']
2020-03-14 16:33:59 [scrapy.middleware] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.robotstxt.RobotsTxtMiddleware',
 'scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
 'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
 'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',
 'scrapy.downloadermiddlewares.retry.RetryMiddleware',
 'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',
 'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',
 'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',
 'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',
 'scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware',
 'scrapy.downloadermiddlewares.stats.DownloaderStats']
2020-03-14 16:33:59 [scrapy.middleware] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
 'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
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 'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
 'scrapy.spidermiddlewares.depth.DepthMiddleware']
2020-03-14 16:33:59 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2020-03-14 16:33:59 [scrapy.core.engine] INFO: Spider opened
2020-03-14 16:33:59 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2020-03-14 16:33:59 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023
2020-03-14 16:33:59 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://www.baidu.com/robots.txt> (referer: None)
2020-03-14 16:33:59 [scrapy.downloadermiddlewares.robotstxt] DEBUG: Forbidden by robots.txt: <GET http://www.baidu.com/>
2020-03-14 16:33:59 [scrapy.core.engine] INFO: Closing spider (finished)
2020-03-14 16:33:59 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/exception_count': 1,
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 'finish_time': datetime.datetime(2020, 3, 14, 8, 33, 59, 677262),
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 'response_received_count': 1,
 'robotstxt/forbidden': 1,
 'robotstxt/request_count': 1,
 'robotstxt/response_count': 1,
 'robotstxt/response_status_count/200': 1,
 'scheduler/dequeued': 1,
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 'scheduler/enqueued': 1,
 'scheduler/enqueued/memory': 1,
 'start_time': datetime.datetime(2020, 3, 14, 8, 33, 59, 326940)}
2020-03-14 16:33:59 [scrapy.core.engine] INFO: Spider closed (finished)

老师 我这个按照百度那个测试     没有返回的html信息

from tkinter import *
from tkinter.filedialog import *

root = Tk()
root.geometry('400x100')

def test1():
    with askopenfile(title='上传文件',
                     intialdir='d:',filetypes=[('文本文件','txt')])as f:
        show['text']=f.read()


Button(root,text='选择读取的文本文件',command=test1).pack()
show = Label(root,width=40,height=3,bg='green')
show.pack()
root.mainloop()

这是怎么回事？

老师，缓冲字节流需要将字节流对象放入缓冲字节流中，代码：

 = FileInputStream();
 = FileOutputStream(, );
BufferedInputStream bis = BufferedInputStream();
BufferedOutputStream bos = BufferedOutputStream();

而字符流直接就可以创建,代码：

BufferedReader reader = new BufferedReader();

BufferedWriter writer = new BufferedWriter();

而不是这样，

FileReader = FileReader();
FileWriter= FileWriter(, );
BufferedReader bufreader = BufferedReader();
BufferedWriter bufwriter = BufferedWriter();

还是说这是俩种方式，不管是字节流还是字符流都可以随意用这俩种方式中的任何一种呐？？

在交互模式下为什a,b的id是一样的，c,d的id不一样呢？是因为#符号在256位以后吗？

保存文件后，通过3.7以上版本查看c和d的id是一样的，就是老师说的3.7版本后缓存范围增大了的原因吧？

在通过静态工厂方法创建对象中，多次调用getBean()方法，返回同一个对象。我试了试，通过其他方法创建对象，然后多次调用getBean()方法，也是返回同一个对象。

老师  请问如果不想把mysql安装到C盘，应该怎么操作，谢谢

老师，订阅的和发布的操作，比如 subscribe channelpython，这个channelpython不需要要先创建吗？可以随便写？

Ribbon 实现负载均衡的编码有两种方式：

1、通过在 RestTemplate 上配置注解 @LoadBalanced;

2、通过类 RibbonLoadBalancerClient 的 choose() 方法实现。我看资料上 RibbonLoadBalancerClient 这个类是可以自动注入的，并且我在测试类中也实现了自动注入的调用：

package cn.edu.hyit.test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest()
public class LoadBalanceTest {

    @Autowired
    RibbonLoadBalancerClient client;

    @Test
    public void test(){
        for (int i = 0; i < 10; i++) {
            ServiceInstance instance = this.client.choose("user-service");
            System.out.println(instance.getHost() + ":" + instance.getPort());
        }
    }
}

结果为：

但是当我在 controller 中对 RibbonLoadBalancerClient 这个类进行自动注入时，会报错，代码如下：

package cn.edu.hyit.user.controller;

import cn.edu.hyit.user.pojo.User;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping("usercontroller")
@Slf4j
public class UserController {
    @Autowired
    private RestTemplate restTemplate;
    @Autowired
    private RibbonLoadBalancerClient ribbonLoadBalancerClient;

    @RequestMapping("findByIdByRibbon2/{id}")
    public User findByIdByRibbon2(@PathVariable("id") Integer id) {
        log.debug("findByIdByRibbon Method is Running...");

        ServiceInstance serviceInstance = ribbonLoadBalancerClient.choose("user-service");
        String url = "http://"+ serviceInstance.getHost() + ":" + serviceInstance.getPort() + "/usercontroller/" + id;
        System.out.println(url);
        User user = restTemplate.getForObject(url, User.class);
        return user;
    }
}

报错如下：

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1506) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:583) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1341) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]

at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]

at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]

at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:398) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:330) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1258) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]

at cn.edu.hyit.ConsumerApplication.main(ConsumerApplication.java:14) [classes/:na]

2020-05-14 15:22:12.532 ERROR 13804 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************

APPLICATION FAILED TO START

***************************

Description:

Field ribbonLoadBalancerClient in cn.edu.hyit.user.controller.UserController required a bean of type 'org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient' that could not be found.

Action:

Consider defining a bean of type 'org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient' in your configuration.

使用的 Spring Cloud 的版本为 Finchley.SR1。

请帮忙看看这个报错，谢谢！

老师，这里的onvalue=1，我可以这么理解吗？就是把1传给了variable，然后再把variable的1传给codehobby，后面在去判断是否等于1，然后执行别的。但是这么理解的话我觉得还有问题，variable=self.codeHobby,这个代码的意思不应该是把self.codeHobby的值赋给了variable吗？我没太理解这里。

点哪个下载

老师之前的课不见了吗，想看之前的JAVAEE项目找不到了