在遇到问题时，要先查应用log
直接找出现ERROR那行，最顶端的就是问题所在。
以下为报错日志：
2019-04-22 11:44:50,988 [localhost-startStop-1] ERROR com.tmri.comm.auth.session.TmriSessionManager - init risinfo Error: java.net.UnknownHostException: JJ.000.cn（为避免泄露，域名做了改动） at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[na:1.6.0_45] at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:876) ~[na:1.6.0_45] at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1229) ~[na:1.6.0_45] at java.net.InetAddress.getAllByName0(InetAddress.java:1180) ~[na:1.6.0_45] at java.net.InetAddress.getAllByName(InetAddress.java:1110) ~[na:1.6.0_45] at java.net.InetAddress.getAllByName(InetAddress.java:1046) ~[na:1.6.0_45] at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45) ~[httpclient-4.2.4.jar:4.2.4] at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:278) ~[httpclient-4.2.4.jar:4.2.4] at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:162) ~[httpclient-4.2.4.jar:4.2.4] at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294) ~[httpclient-4.2.4.jar:4.2.4] at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:644) ~[httpclient-4.2.4.jar:4.2.4] at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479) ~[httpclient-4.2.4.jar:4.2.4] at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906) ~[httpclient-4.2.4.jar:4.2.4] at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805) ~[httpclient-4.2.4.jar:4.2.4] at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784) ~[httpclient-4.2.4.jar:4.2.4] at com.tmri.rural.access.service.common.impl.CodeConstDataAccessServiceImpl.visitHttpsGab(CodeConstDataAccessServiceImpl.java:290) ~[CodeConstDataAccessServiceImpl.class:na] at com.tmri.rural.authentication.session.RuralSessionManager.initRisInfo(RuralSessionManager.java:525) ~[RuralSessionManager.class:na] at com.tmri.rural.authentication.session.RuralSessionManager.afterPropertiesSet(RuralSessionManager.java:462) ~[RuralSessionManager.class:na] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1613) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1550) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1457) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1198) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1457) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1198) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:92) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:101) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:85) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:103) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:291) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:959) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:931) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:465) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1457) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1198) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:92) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:101) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:85) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:103) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:291) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:959) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:931) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:465) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1457) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1198) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:92) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:101) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:85) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:103) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:291) [spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:959) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:931) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:465) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:706) [spring-beans-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762) [spring-context-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) [spring-context-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403) [spring-web-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306) [spring-web-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106) [spring-web-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973) [catalina.jar:7.0.53] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467) [catalina.jar:7.0.53] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [catalina.jar:7.0.53] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) [catalina.jar:7.0.53] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) [catalina.jar:7.0.53] at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) [na:1.6.0_45] at java.util.concurrent.FutureTask.run(FutureTask.java:138) [na:1.6.0_45] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [na:1.6.0_45] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [na:1.6.0_45] at java.lang.Thread.run(Thread.java:662) [na:1.6.0_45]
原因已清楚：UnknownHostException（未知主机异常）
于是，在命令窗口ping www.baidu.com，发现无法ping通
检查/etc/resolve.conf，发现，里面只有一个DNS：202.96.128.166
而正常的应用，/etc/resolve.conf里面有2个DNS：202.96.128.166，202.96.128.86
于是多加了202.96.128.86后，应用就能正常启动工作了。
后查知，这个202.96.128.166是电信的DNS。以后配置DNS要多配几个，可电信移动混合配。如果服务只在国内，就尽量不用8.8.8.8，因为这个DNS跳的线路比较多，延时可能会有点长。