Java Web项目一般都比较重，不但有外部依赖，而且因为Java是静态语言，还需要编译后再打包才可以发布，每次遇到问题都需要重复这个过程。 本文介绍Spring Boot CLI可以实现快速的项目的开发和调试（不过语言使用了JVM上的Groovy）
安装
*Spring Boot CLI的安装方式有很多种，支持sdkman安装，在MacOS上也可以使用HomeBrew。本文介绍手工安装，Windows, Mac, Linux系统都可以使用。
- 下载压缩包
wget https://repo.spring.io/release/org/springframework/boot/spring-boot-cli/2.2.2.RELEASE/spring-boot-cli-2.2.2.RELEASE.jar
也可以在https://repo.spring.io/release/org/springframework/boot/spring-boot-cli选择想要的版本，再下载
- 解压到目标目录
unzip spring-boot-cli-2.2.2.RELEASE-bin.zip -d ~/
mv ~/spring-2.2.2.RELEASE ~/spring-boot-cli
- 配置环境变量
echo SPRING_HOME=/home/tenmao/spring-boot-cli >> ~/.bashrc
echo 'PATH=$SPRING_HOME/bin:$PATH' >> ~/.bashrc
source ~/.bashrc
spring --version
运行Groovy
- hello.groovy
@RestController
class WebApplication {
@RequestMapping("/")
String home() {
"Hello World!\n"
}
}
- 运行
spring run hello.groovy
超级便捷，跟PHP、Python等动态语言一样，可以实现快速的项目部署。Spring Boot cli的grab机制，会自动去下载依赖的Jar包
[tenmao@VM_77_51_centos ~/spring-2.2.2.RELEASE]$ bin/spring run hello.groovy
Resolving dependencies...........................
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.2.RELEASE)
2019-12-18 14:44:42.450 INFO 32015 --- [ runner-0] o.s.boot.SpringApplication : Starting application on VM_77_51_centos with PID 32015 (started by tenmao in /data/home/tenmao/spring-2.2.2.RELEASE)
2019-12-18 14:44:42.456 INFO 32015 --- [ runner-0] o.s.boot.SpringApplication : No active profile set, falling back to default profiles: default
2019-12-18 14:44:43.560 INFO 32015 --- [ runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-12-18 14:44:43.578 INFO 32015 --- [ runner-0] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-12-18 14:44:43.578 INFO 32015 --- [ runner-0] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.29]
2019-12-18 14:44:43.626 INFO 32015 --- [ runner-0] org.apache.catalina.loader.WebappLoader : Unknown class loader [org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader@64765494] of class [class org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader]
2019-12-18 14:44:43.661 INFO 32015 --- [ runner-0] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-12-18 14:44:43.661 INFO 32015 --- [ runner-0] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1015 ms
2019-12-18 14:44:43.875 INFO 32015 --- [ runner-0] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2019-12-18 14:44:44.338 INFO 32015 --- [ runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2019-12-18 14:44:44.342 INFO 32015 --- [ runner-0] o.s.boot.SpringApplication : Started application in 2.566 seconds (JVM running for 35.992)
2019-12-18 14:44:59.802 INFO 32015 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2019-12-18 14:44:59.803 INFO 32015 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2019-12-18 14:44:59.810 INFO 32015 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 7 ms
默认是8080端口，也可以指定其他端口
spring run hello.groovy -- --server.port=9000
- 测试
[root@VM_77_51_centos ~]# curl http://localhost:8080/
Hello World!
其他高级命令
可以spring help查看其它命令及使用方法
[tenmao@VM_77_51_centos ~]$ spring help
usage: spring [--help] [--version]
<command> [<args>]
Available commands are:
run [options] <files> [--] [args]
Run a spring groovy script
grab
Download a spring groovy script's dependencies to ./repository
jar [options] <jar-name> <files>
Create a self-contained executable jar file from a Spring Groovy script
war [options] <war-name> <files>
Create a self-contained executable war file from a Spring Groovy script
install [options] <coordinates>
Install dependencies to the lib/ext directory
uninstall [options] <coordinates>
Uninstall dependencies from the lib/ext directory
init [options] [location]
Initialize a new project using Spring Initializr (start.spring.io)
encodepassword [options] <password to encode>
Encode a password for use with Spring Security
shell
Start a nested shell
Common options:
--debug Verbose mode
Print additional status information for the command you are running
