SpringBoot啓動Tomcat報錯LibraryNotFoundError，Can't load library:tcnative-1.dll

環境：Windows10-64位，SpringCloud是最新的Greenwich.RC2，SpringBoot是2.1.1，內嵌Tomcat 9.0.13，

最近搭建的SpringCloud項目，把日誌級別設爲Debug後，從控制檯看到啓動時tomcat報無法找到JNI動態鏈接庫的錯誤，完整的異常棧信息如下：

org.apache.tomcat.jni.LibraryNotFoundError: Can't load library: D:\xxx\bin\tcnative-1.dll, Can't load library: D:\xxx\bin\libtcnative-1.dll, no tcnative-1 in java.library.path, no libtcnative-1 in java.library.path
	at org.apache.tomcat.jni.Library.<init>(Library.java:102) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.apache.tomcat.jni.Library.initialize(Library.java:206) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.apache.catalina.core.AprLifecycleListener.init(AprLifecycleListener.java:198) [tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.apache.catalina.core.AprLifecycleListener.isAprAvailable(AprLifecycleListener.java:107) [tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.apache.catalina.connector.Connector.<init>(Connector.java:80) [tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:164) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:540) [spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at cc.liudun.SpringCloudDemoApplication.main(SpringCloudDemoApplication.java:21) [classes/:na]

這是因爲Tomcat中的connector爲了提高性能，採用了加載與操作系統綁定（非跨平臺）的本地庫的方式，比如Windows系統中就是.dll動態鏈接庫。上述異常中找不到的兩個.dll庫文件，默認會去Tomcat的bin目錄下去找，但是由於SpringBoot的Tomcat是嵌入式的，沒有這兩個.dll，所以只好自己去官網下載，到如下官方地址下載，並放到C:\Windows\System32\目錄下：

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