我正在嘗試從命令列運行 spring boot 應用程式并傳遞一個命令列引數。我嘗試了幾種方法都不起作用：-
Try 1: mvn spring-boot:run -DCALLBACK_PORT="8000"
Try 2: mvn spring-boot:run -D CALLBACK_PORT="8000"
Try 3: mvn spring-boot:run -DargLine="CALLBACK_PORT=8000"
Try 4: mvn -DargLine="CALLBACK_PORT=8000" spring-boot:run
在所有情況下，應用程式都會運行。我試圖將其解讀為：-
String evnCallBackPort = System.getenv("CALLBACK_PORT");
System.out.println("CALLBACK_PORT: " evnCallBackPort);
它列印 CALLBACK_PORT: null
如何使用此命令列引數運行它？
uj5u.com熱心網友回復：
首先，您應該將以下配置添加到您的 pom 檔案中。
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<environmentVariables>
<CALLBACK_PORT>${env.callbackport}</CALLBACK_PORT>
</environmentVariables>
</configuration>
</plugin>
</plugins>
</build>
在 pom 檔案中，您通過 environmentVariables parameter.ref 定義應用程式的環境變數：https ://docs.spring.io/spring-boot/docs/current/maven-plugin/reference/htmlsingle/#goals-run-parameters -details-arguments
其次，當你運行你的應用程式時，在你的命令列中添加相應的引數來填充pom檔案中的占位符，在這個例子中是“${env.callbackport}”，對應的命令列引數是-Denv.callbackport= “3221”類似于以下命令列：
mvn spring-boot:run -Denv.callbackport="3221"
您可以參考示例專案https://github.com/bluezealot/mvnparam/tree/master/java2ets 上面命令列的輸出是，注意輸出“CALLBACK_PORT: 3221”：
$ mvn spring-boot:run -Denv.callbackport="3221"
/usr/lib/jvm/java-11-openjdk-amd64/bin/java
[INFO] Scanning for projects...
[INFO]
[INFO] -------------------< com.hoperun.java2ets:java2ets >--------------------
[INFO] Building java2ets 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] >>> spring-boot-maven-plugin:2.6.4:run (default-cli) > test-compile @ java2ets >>>
[INFO]
[INFO] --- maven-resources-plugin:3.2.0:resources (default-resources) @ java2ets ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Using 'UTF-8' encoding to copy filtered properties files.
[INFO] Copying 0 resource
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ java2ets ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:3.2.0:testResources (default-testResources) @ java2ets ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Using 'UTF-8' encoding to copy filtered properties files.
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ java2ets ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] <<< spring-boot-maven-plugin:2.6.4:run (default-cli) < test-compile @ java2ets <<<
[INFO]
[INFO]
[INFO] --- spring-boot-maven-plugin:2.6.4:run (default-cli) @ java2ets ---
[INFO] Attaching agents: []
20:57:14.223 [main] INFO com.hoperun.java2ets.java2ets.Java2etsApplication - args: 0
20:57:14.231 [main] INFO com.hoperun.java2ets.java2ets.Java2etsApplication - CALLBACK_PORT: 3221
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.6.4)
2022-04-20 20:57:14.702 INFO 99391 --- [ main] c.h.j.java2ets.Java2etsApplication : Starting Java2etsApplication using Java 11.0.14.1 on qxz-ubuntu with PID 99391 (/home/qinxizhou/work/jtekt/mvnparam/java2ets/target/classes started by qinxizhou in /home/qinxizhou/work/jtekt/mvnparam/java2ets)
2022-04-20 20:57:14.703 INFO 99391 --- [ main] c.h.j.java2ets.Java2etsApplication : No active profile set, falling back to 1 default profile: "default"
2022-04-20 20:57:14.917 INFO 99391 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2022-04-20 20:57:14.918 INFO 99391 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Redis repositories in DEFAULT mode.
2022-04-20 20:57:14.929 INFO 99391 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 3 ms. Found 0 Redis repository interfaces.
2022-04-20 20:57:15.212 INFO 99391 --- [ main] c.h.j.java2ets.Java2etsApplication : Started Java2etsApplication in 0.913 seconds (JVM running for 1.135)
2022-04-20 20:57:15.213 INFO 99391 --- [ main] c.h.java2ets.java2ets.EntryService : Console Start---
2022-04-20 20:57:15.214 INFO 99391 --- [ main] c.h.java2ets.java2ets.EntryService : Console End---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.144 s
[INFO] Finished at: 2022-04-20T20:57:15 08:00
[INFO] ------------------------------------------------------------------------
uj5u.com熱心網友回復：
命令列引數應與命令一起傳遞
mvn spring-boot:run '-Dspring-boot.run.arguments=CALLBACK_PORT=8000'
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