一.现象

    项目启动时出现如下信息

Starting WarmStartApplication on DESKTOP-H32M6NI with PID 4264 (D:\IntelliJIdea\demo-nuan\admin\target\classes started by ye6love in D:\IntelliJIdea\demo-nuan)
com.nuan.WarmStartApplication            : No active profile set, falling back to default profiles: default
o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 81 (http)
o.apache.catalina.core.StandardService   : Starting service [Tomcat]
org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/9.0.13
o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [D:\jdk1.8.0_45_64\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;c:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files\Microsoft\Web Platform Installer\;C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\;D:\Server\maven\bin;D:\jdk1.8.0_45_64\bin;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;E:\Program Files\TortoiseSVN\bin;C:\WINDOWS\System32\OpenSSH\;D:\mysql\bin;D:\developTools\nginx-1.14.0;C:\Users\ye6love\AppData\Local\Microsoft\WindowsApps;;.]
o.a.c.c.C.[Tomcat].[localhost].[/erp]    : Initializing Spring embedded WebApplicationContext
o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1751 ms
o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 81 (http) with context path '/erp'
com.nuan.WarmStartApplication            : Started WarmStartApplication in 3.636 seconds (JVM running for 4.508)

二.原因

    1.Tomcat可以使用Apache Portable Runtime(APR)提供优越的可伸缩性、性能和更好的与本地服务器技术的集成。

Apache Portable Runtime是一个具有高度的可移植性库的核心是Apache HTTP Server 2. x。

APR有许多用途,包括访问高级IO功能(如sendfile epoll和OpenSSL),操作系统级别的功能(随机数生成、系统状态等),

和本地流程处理(共享内存,NT管道和Unix套接字)。这些特性可以使Tomcat通用网络服务器,将使更好的与其他本地web技术,

集成和整体让Java更可行的为一个网络服务器平台的成熟而不是简单的后端技术。

    2.提升比较多的是对ssl的处理效率，当tomcat处理https的请求是，如果使用本地的openssl库，肯定会比前面提升的效率高。

三.解决

    C:\Windows\System32目录下缺少【tcnative-1.dll】和【tcnative-1-src.pdb】两个文件。下载地址：

http://archive.apache.org/dist/tomcat/tomcat-connectors/native/1.2.14/binaries/

下载解压后目录：\bin\x64。