最近一段時間，容器化成為了一種趨勢。一台服務器可以虛擬成多個容器，同時提供服務，共享硬件資源，節約成本，容器化的翹楚就是Docker，我司的所有微服務的發布都已經容器化。 spring boot 也緊跟潮流，加入了Docker的maven插件，可以通過執行命令來製作鏡像。
本節的主要內容不是講代碼，而是講這個Docker插件。廢話不多說，上pom
<plugin> <groupId>com.spotify</groupId> <artifactId>docker-maven-plugin</artifactId> <version>0.4.12</version> <configuration> <!-- 注意imageName一定要是符合正則[a-z0-9-_.]的，否則構建不會成功--> <!-- 詳見：https://github.com/spotify/docker-maven-plugin Invalid repository name ... only [a-z0-9-_.] are allowed--> <imageName>spring-boot-docker-start</imageName> <!--相當於from java,本地有使用本地的鏡像，沒有的話從遠程倉庫拉取--> <baseImage>java</baseImage> <exposes> <!--暴露容器內的8080端口--> <expose>8080</expose> </exposes> <!--進入點，執行的命令--> <entryPoint>["java", "-jar", "/${project.build.finalName}.jar"]</entryPoint> <resources> <resource> <targetPath>/</targetPath> <directory>${project.build.directory}</directory> <include>${project.build.finalName}.jar</include> </resource> </resources> </configuration> </plugin> imageName就是鏡像的名稱。 baseImage是基礎鏡像，本地有使用本地的鏡像，沒有的話從遠程倉庫拉取，暴露容器內的8080端口，執行java -jar 命令，啟動微服務。我們知道使用Docker需要製定Dockerfile文件，裡面的元素完全通過maven插件的標籤來體現了。還是有前提的，你得先安裝好Docker。講解到這裡，我們開始運行
第一步：執行mvn clean package docker:build創建生成鏡像。
第二步：啟動鏡像docker run -it -P spring-boot-docker-start,看下容器內的日誌
➜ spring-boot-docker-start git:(master) docker run -it -P spring-boot-docker-start . ____ _ __ _ _ /// / ___'_ __ _ _(_)_ __ __ _ / / / /( ( )/___ | '_ | '_| | '_ // _` | / / / / /// ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_/__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.3.5.RELEASE)2018-03-25 08:41:56.274 INFO 1 --- [ main] com.shuqi.ApplicationMain : Starting ApplicationMain on 075543f8f5b6 with PID 1 (/spring-boot-docker-start.jar started by root in /)2018-03-25 08:41:56.287 INFO 1 --- [ main] com.shuqi.ApplicationMain : No active profile set, falling back to default profiles: default2018-03-25 08:41:56.406 INFO 1 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@126d28d3: startup date [Sun Mar 25 08:41:56 UTC 2018]; root of context hierarchy2018-03-25 08:41:58.356 INFO 1 --- [ main] sbcetTomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)2018-03-25 08:41:58.382 INFO 1 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat2018-03-25 08:41:58.384 INFO 1 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.0.332018-03-25 08:41:58.512 INFO 1 --- [ost-startStop-1] oaccC[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext2018-03-25 08:41:58.512 INFO 1 --- [ost-startStop-1] osweb.context.ContextLoader : Root WebApplicationContext: initialization completed in 2113 ms2018-03-25 08:41:58.920 INFO 1 --- [ost-startStop-1] osbceServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]2018-03-25 08:41:58.928 INFO 1 --- [ost-startStop-1] osbcembedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]2018-03-25 08:41:58.937 INFO 1 --- [ost-startStop-1] osbcembedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]2018-03-25 08:41:58.937 INFO 1 --- [ost-startStop-1] osbcembedded.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]2018-03-25 08:41:58.938 INFO 1 --- [ost-startStop-1] osbcembedded.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]2018-03-25 08:41:59.406 INFO 1 --- [ main] swsmmaRequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@126d28d3: startup date [Sun Mar 25 08:41:56 UTC 2018]; root of context hierarchy2018-03-25 08:41:59.516 INFO 1 --- [ main] swsmmaRequestMappingHandlerMapping : Mapped "{[/hello],methods=[GET]}" onto public java.lang.String com.shuqi.controller.HelloController.hello()2018-03-25 08:41:59.523 INFO 1 --- [ main] swsmmaRequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)2018-03-25 08:41:59.524 INFO 1 --- [ main] swsmmaRequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)2018-03-25 08:41:59.584 INFO 1 --- [ main] oswshandler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2018-03-25 08:41:59.585 INFO 1 --- [ main] oswshandler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2018-03-25 08:41:59.645 INFO 1 --- [ main] oswshandler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2018-03-25 08:41:59.754 INFO 1 --- [ main] osjeaAnnotationMBeanExporter : Registering beans for JMX exposure on startup2018-03-25 08:41:59.834 INFO 1 --- [ main] sbcetTomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)2018-03-25 08:41:59.838 INFO 1 --- [ main] com.shuqi.ApplicationMain : Started ApplicationMain in 4.084 seconds (JVM running for 5.012)[2018-03-25 08:41:59] server started!啟動成功。
第三步：輸入docker ps看看容器內的8080端口被映射到了本機的哪個端口
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES075543f8f5b6 spring-boot-docker-start "java -jar /spring..." About a minute ago Up About a minute 0.0.0.0:32768->8080/tcp trusting_noether
確定是32768端口。
第四步：瀏覽器中輸入http://localhost:32768/hello,看到結果
說明我們訪問容器內的程序成功了！
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。