有效沟通问答-【官方】百战程序员_IT在线教育培训机构

from time import sleep
from threading import Thread
from threading import Event

def car():
    global count
    num=0
    while True:
        #if even.is_set():
        if count%5 !=0:
            print("车已到站，可以上车!!!")
            sleep(1)
            count += 1
            num+=1
            #if num %5 ==0:
                #even.clear()
        else:
            print("车开走了...")
            sleep(6)
            count=1
            #even.set()
def person():

    while True:
        if count %5 !=0:
        #if even.is_set():
            print("上车!!!")
            sleep(1)
        else:
            print("等待车！！！")
            #even.wait()

if __name__ == '__main__':
    #even= Event()
    count = 1
    t1 = Thread(target=car)
    t2 = Thread(target=person)
    t1.start()
    t2.start()

老师，car方法中将count声明为全局变量并且进行新的赋值。而person方法中没有进行声明。线程1调用car方法修改count值后，是不是线程2在调用person方法的时候，就获取到了新的count值？所以不需要声明？如果线程2的运行速度比线程1快，会不会获取到错误的值呢？运行结果如下

Python 全系列/第三阶段：Python 网络与并发编程/并发编程 26013楼

from time import sleep
from threading import Thread
from threading import Event

def car():
    global count
    num=0
    while True:
        if even.is_set():
            print("车已到站，可以上车!!!")
            sleep(1)
            #count += 1
            num+=1
            if num %5 ==0:
                even.clear()
        else:
            print("车开走了...")
            sleep(6)
            #count=1
            even.set()
def person():

    while True:
        #if count %5 !=0:
        if even.is_set():
            print("上车!!!")
            sleep(1)
        else:
            print("等待车！！！")
            even.wait()

if __name__ == '__main__':
    even= Event()
    #count = 1
    t1 = Thread(target=car)
    t2 = Thread(target=person)
    t1.start()
    t2.start()

老师，为什么会出现这种情况，是不是person的线程运行的速度有时候比car的线程快导致的？

Python 全系列/第三阶段：Python 网络与并发编程/并发编程 26014楼

我这个xampp可以用，但是查看是不是安装成功，我输入127.0.0.1:80（我这个端口是80）和localhost都是进入不了xampp页面

WEB前端全系列/第五阶段：前后端交互/PHP、数据库编程与设计 26015楼

红线这里，list != null, 不就是代表能查到了吗，有重复了，为什么还能插入

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：完成CMS系统 26016楼

老师，我这个去除下划线怎么没作用呢？

JAVA 全系列/第五阶段：网页编程和设计/CSS3（旧） 26017楼

老师可以帮忙看一下这个问题吗？这个项目之前的一个service中使用是没有这个问题的。另外我在postman中用相同的用户名和密码也显示可以登录。另外浏览器中登录时显示500 Internal Server Error。对比了老师的代码很久真的是不知道问题在哪里

feign.FeignException$BadRequest: [400] during [POST] to [http://authorization-server/oauth/token?grant_type=password&username=15827293117&password=e10adc3949ba59abbe56e057f20f883e&login_type=member_type] [OAuth2FeignClient#getToken(String,String,String,String,String)]: [{"error":"invalid_grant","error_description":"Bad credentials"}]

at feign.FeignException.clientErrorStatus(FeignException.java:195) ~[feign-core-10.7.4.jar:na]

at feign.FeignException.errorStatus(FeignException.java:177) ~[feign-core-10.7.4.jar:na]

at feign.FeignException.errorStatus(FeignException.java:169) ~[feign-core-10.7.4.jar:na]

at feign.codec.ErrorDecoder$Default.decode(ErrorDecoder.java:92) ~[feign-core-10.7.4.jar:na]

at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:156) ~[feign-core-10.7.4.jar:na]

at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:80) ~[feign-core-10.7.4.jar:na]

at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:100) ~[feign-core-10.7.4.jar:na]

at com.sun.proxy.$Proxy162.getToken(Unknown Source) ~[na:na]

at com.bjsxt.service.impl.LoginServiceImpl.login(LoginServiceImpl.java:42) ~[classes/:na]

at com.bjsxt.controller.LoginController.login(LoginController.java:38) ~[classes/:na]

at com.bjsxt.controller.LoginController$$FastClassBySpringCGLIB$$2d692927.invoke(<generated>) ~[classes/:na]

at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:100) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at com.bjsxt.aspect.WebLogAspect.recodeWebLog(WebLogAspect.java:58) ~[classes/:na]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_211]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_211]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_211]

at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_211]

at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at com.bjsxt.controller.LoginController$$EnhancerBySpringCGLIB$$1b27b78.login(<generated>) ~[classes/:na]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_211]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_211]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_211]

at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_211]

at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.31.jar:9.0.31]

at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]

at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.31.jar:9.0.31]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.31.jar:9.0.31]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.31.jar:9.0.31]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.31.jar:9.0.31]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) ~[spring-security-web-5.2.2.RELEASE.jar:5.2.2.RELEASE]

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) ~[spring-security-web-5.2.2.RELEASE.jar:5.2.2.RELEASE]

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) ~[spring-security-web-5.2.2.RELEASE.jar:5.2.2.RELEASE]