按照步骤做了两次 测试总是空白页 不明白为什么

20-Feb-2020 17:11:58.192 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server.服务器版本:     Apache Tomcat/8.5.49

20-Feb-2020 17:11:58.196 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 服务器构建:            Nov 17 2019 18:45:30 UTC

20-Feb-2020 17:11:58.196 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 服务器版本号(：8.5.49.0

20-Feb-2020 17:11:58.196 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name:               Windows 10

20-Feb-2020 17:11:58.196 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log OS.版本:               10.0

20-Feb-2020 17:11:58.196 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 架构:                  x86

20-Feb-2020 17:11:58.196 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Java 环境变量:         C:\Program Files (x86)\Java\jdk1.8.0_73\jre

20-Feb-2020 17:11:58.196 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM 版本:              1.8.0_73-b02

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM.供应商:            Oracle Corporation

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE:         C:\Users\win10\.IntelliJIdea2019.2\system\tomcat\Unnamed_cake

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME:         E:\apache-tomcat-8.5.49\apache-tomcat-8.5.49

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=C:\Users\win10\.IntelliJIdea2019.2\system\tomcat\Unnamed_cake\conf\logging.properties

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:62718,suspend=y,server=n

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -javaagent:C:\Users\win10\.IntelliJIdea2019.2\system\captureAgent\debugger-agent.jar

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote=

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.port=1099

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.ssl=false

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.password.file=C:\Users\win10\.IntelliJIdea2019.2\system\tomcat\Unnamed_cake\jmxremote.password

20-Feb-2020 17:11:58.197 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.access.file=C:\Users\win10\.IntelliJIdea2019.2\system\tomcat\Unnamed_cake\jmxremote.access

20-Feb-2020 17:11:58.198 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.rmi.server.hostname=127.0.0.1

20-Feb-2020 17:11:58.198 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djdk.tls.ephemeralDHKeySize=2048

20-Feb-2020 17:11:58.198 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources

20-Feb-2020 17:11:58.198 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dignore.endorsed.dirs=

20-Feb-2020 17:11:58.198 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=C:\Users\win10\.IntelliJIdea2019.2\system\tomcat\Unnamed_cake

20-Feb-2020 17:11:58.198 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=E:\apache-tomcat-8.5.49\apache-tomcat-8.5.49

20-Feb-2020 17:11:58.202 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=E:\apache-tomcat-8.5.49\apache-tomcat-8.5.49\temp

20-Feb-2020 17:11:58.202 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files (x86)\Java\jdk1.8.0_73\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;"C:\WINDOWS\System32\WindowsPowerShell\v1.0\; C:\Program Files (x86)\Java\jdk1.8.0_73\bin;C:\Program Files (x86)\Java\jdk1.8.0_73\jre\bin;";C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Users\win10\AppData\Local\Programs\Python\Python36\Scripts\;C:\Users\win10\AppData\Local\Programs\Python\Python36\;C:\Users\win10\AppData\Local\Microsoft\WindowsAppsC:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\bin;C:\Program Files\MySQL\MySQL Server 8.0\bin;E:\apache-maven-3.6.3-bin\apache-maven-3.6.3\bin;;.]

20-Feb-2020 17:11:58.316 信息 [main] org.apache.coyote.AbstractProtocol.init 初始化协议处理器 ["http-nio-8080"]

20-Feb-2020 17:11:58.333 信息 [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read

20-Feb-2020 17:11:58.343 信息 [main] org.apache.coyote.AbstractProtocol.init 初始化协议处理器 ["ajp-nio-8009"]

20-Feb-2020 17:11:58.344 信息 [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read

20-Feb-2020 17:11:58.345 信息 [main] org.apache.catalina.startup.Catalina.load Initialization processed in 456 ms

20-Feb-2020 17:11:58.370 信息 [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]

20-Feb-2020 17:11:58.370 信息 [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.49

20-Feb-2020 17:11:58.380 信息 [main] org.apache.coyote.AbstractProtocol.start 开始协议处理句柄["http-nio-8080"]

20-Feb-2020 17:11:58.397 信息 [main] org.apache.coyote.AbstractProtocol.start 开始协议处理句柄["ajp-nio-8009"]

20-Feb-2020 17:11:58.400 信息 [main] org.apache.catalina.startup.Catalina.start Server startup in 55 ms

20-Feb-2020 17:11:59.567 信息 [RMI TCP Connection(3)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars 至少有一个JAR被扫描用于TLD但尚未包含TLD。 为此记录器启用调试日志记录，以获取已扫描但未在其中找到TLD的完整JAR列表。 在扫描期间跳过不需要的JAR可以缩短启动时间和JSP编译时间。

20-Feb-2020 17:12:08.401 信息 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory 把web 应用程序部署到目录 [E:\apache-tomcat-8.5.49\apache-tomcat-8.5.49\webapps\manager]

20-Feb-2020 17:12:08.510 信息 [localhost-startStop-1] org.apache.jasper.servlet.TldScanner.scanJars 至少有一个JAR被扫描用于TLD但尚未包含TLD。 为此记录器启用调试日志记录，以获取已扫描但未在其中找到TLD的完整JAR列表。 在扫描期间跳过不需要的JAR可以缩短启动时间和JSP编译时间。

20-Feb-2020 17:12:08.526 信息 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [E:\apache-tomcat-8.5.49\apache-tomcat-8.5.49\webapps\manager] has finished in [125] ms