创建一个简单的springboot项目
一、在 pom.xml 中 ，使用 Spring Boot 2.2.10 相关依赖
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.10.RELEASE</version>
</parent>
二、添加 web 和测试依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
三、创建一个 DockerController，在其中有一个hello()方法，访问时返回：hello,nihao
@RestController
public class DockerController {
@RequestMapping("/hello")
public String hello() {
return "hello,nihao";
}
}
四、启动类
@SpringBootApplication
public class DockerApplication {
public static void main(String[] args) {
SpringApplication.run(DockerApplication.class, args);
}
}
添加完毕后启动项目，启动成功后浏览器访问：http://localhost:8080/hello，页面返回：hello,nihao，说明 Spring Boot 项目配置正常。
使用 Docker 部署 Spring Boot 项目
一、将项目打成jar包，拷贝到服务器上，测试一下
[root@jiangwang springbootDemo]# ls
demo-0.0.1-SNAPSHOT.jar Dockerfile
[root@jiangwang springbootDemo]# java -jar demo-0.0.1-SNAPSHOT.jar
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.10.RELEASE)
2021-03-18 14:49:18.241 INFO 12886 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication v0.0.1-SNAPSHOT on jiangwang with PID 12886 (/home/springbootDemo/demo-0.0.1-SNAPSHOT.jar started by root in /home/springbootDemo)
2021-03-18 14:49:18.244 INFO 12886 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to default profiles: default
2021-03-18 14:49:19.924 INFO 12886 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2021-03-18 14:49:19.938 INFO 12886 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-03-18 14:49:19.938 INFO 12886 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.38]
2021-03-18 14:49:20.013 INFO 12886 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-03-18 14:49:20.014 INFO 12886 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1657 ms
2021-03-18 14:49:20.321 INFO 12886 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2021-03-18 14:49:20.520 INFO 12886 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2021-03-18 14:49:20.523 INFO 12886 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 2.899 seconds (JVM running for 3.369)
二、看到 Spring Boot 的启动日志后表明环境配置没有问题，编辑Dockerfile文件：
FROM java:8
COPY *.jar /app.jar
CMD ["--server.port=8080"]
EXPOSE 8080
ENTRYPOINT ["java","-jar","/app.jar"]
三、接下来我们使用 Dockerfile 构建镜像：
## 构建镜像
[root@jiangwang springbootDemo]# docker build -t springboot-demo .
Sending build context to Docker daemon 17.72MB
Step 1/5 : FROM java:8
---> d23bdf5b1b1b
Step 2/5 : COPY *.jar /app.jar
---> f4d6aeabd3f0
Step 3/5 : CMD ["--server.port=8080"]
---> Running in a6311f7cf7b5
Removing intermediate container a6311f7cf7b5
---> d8117b10cefa
Step 4/5 : EXPOSE 8080
---> Running in ae180be637bb
Removing intermediate container ae180be637bb
---> f16702c75ab6
Step 5/5 : ENTRYPOINT ["java","-jar","/app.jar"]
---> Running in fafa00625666
Removing intermediate container fafa00625666
---> d4c3e225699d
Successfully built d4c3e225699d
Successfully tagged springboot-demo:latest
四、运行镜像：
# 运行镜像
[root@jiangwang springbootDemo]# docker run -d -p 39005:8080 --name my-springboot springboot-demo
7ac35852cb91cb10612cd28fdbe7c50c7c59df4cccf19b2f1d30dcabbfe501f4
[root@jiangwang springbootDemo]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7ac35852cb91 springboot-demo "java -jar /app.jar …" 33 seconds ago Up 32 seconds 0.0.0.0:39005->8080/tcp my-springboot
[root@jiangwang springbootDemo]# curl localhost:39005/hello
hello,nihao[root@jiangwang springbootDemo]#
五、浏览器输入外网网址访问一下:
这里你的外网39005端口首先要开放了，可以去安全组设置
说明使用 Docker 部署 Spring Boot 项目成功！
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