Question

工具：

Sprint 启动 2.4.3
IntelliJ IDEA 2020.3.3 社区版
Java 15.0.2

我只是使用 Spring Assistant 创建了一个演示项目，并打开了 Spring Web 依赖项，pom.xml 也有

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

当我运行 DemoApplication.java 时，应用程序在启动后立即关闭，不打印任何有关服务器或端口的信息：

2021-03-18 09:17:38.398  INFO 8553 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication using Java 15.0.2 on Summoring-MBP.local with PID 8553 (/Users/Smeegol/Git/demo2/target/classes started by Smeegol in /Users/Smeegol/Git/demo2)
2021-03-18 09:17:38.403  INFO 8553 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2021-03-18 09:17:40.286  INFO 8553 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 3.424 seconds (JVM running for 4.374)

Process finished with exit code 0

如何在应用程序启动后让Web服务器运行并监听8080之类的端口？谢谢。

源代码可以从这里下载：https://github.com/Smeegol/SpringBootDemo/blob/main/demo.zip

Answer 1

您的代码有效。我没有 Java 15，我已将其更改为使用 11 并运行。

这是我得到的：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.4.3)

2021-03-17 23:15:01.495  INFO 34616 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication using Java 11.0.3 on machine1.domain.com with PID 34616 (/Users/test/Downloads/demo 5/out/production/demo started by test in /Users/test/Downloads/demo 5)
2021-03-17 23:15:01.497  INFO 34616 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2021-03-17 23:15:02.192  INFO 34616 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-03-17 23:15:02.199  INFO 34616 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-03-17 23:15:02.199  INFO 34616 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.43]
2021-03-17 23:15:02.251  INFO 34616 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2021-03-17 23:15:02.251  INFO 34616 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 711 ms
2021-03-17 23:15:02.362  INFO 34616 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2021-03-17 23:15:02.495  INFO 34616 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-03-17 23:15:02.508  INFO 34616 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.249 seconds (JVM running for 1.977)

JDK 15 可能“太新”了。如果您只是在试验，请将 JDK 降级到较低的版本。 Java 11 有长期支持。

Answer 2

这发生在你的源代码中没有任何 API 被监听时，这意味着你的源代码中没有任何标有 @RestController 或 @Controller 注释的类，此时 SpringBoot 只是只需构建源代码运行并退出而不返回任何错误消息

Spring Boot 2.4.3 应用启动后立即关闭

2 个答案: