Spring Boot - Helloworld

Download Spring Initializer

https://start.spring.io/#!type=gradle-project&language=java&platformVersion=2.2.7.RELEASE&packaging=jar&jvmVersion=1.8&groupId=com.example&artifactId=demo&name=demo&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.demo&dependencies=lombok,webflux,session,devtools

HelloController.java

package com.example.demo;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.RestController;

import reactor.core.publisher.Flux;

@RestController

public class HelloController {

    @GetMapping

    public String hello(@RequestParam(defaultValue = "", required = false) String name) {

        return "hello " + name;

    }

    @GetMapping("/ids")

    public Flux<String> ids() {

        return Flux.just("1","2","3");

    }

}

Run bootRun

gradle bootRun

Starting a Gradle Daemon, 1 busy and 1 incompatible and 1 stopped Daemons could not be reused, use --status for details

> Task :bootRun

  .   ____          _            __ _ _

/\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

\\/  ___)| |_)| | | | | || (_| |  ) ) ) )

  '  |____| .__|_| |_|_| |_\__, | / / / /

=========|_|==============|___/=/_/_/_/

:: Spring Boot ::        (v2.2.7.RELEASE)

2020-05-12 23:30:11.100  INFO 6864 --- [  restartedMain] com.example.demo.DemoApplication         : Starting DemoApplication on isaac-PC with PID 6864 (C:\Users\isaac\workspace_github\study-practice\build\classes\java\main started by isaac in C:\Users\isa

ac\workspace_github\study-practice)

2020-05-12 23:30:11.103  INFO 6864 --- [  restartedMain] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default

2020-05-12 23:30:11.150  INFO 6864 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable

2020-05-12 23:30:11.150  INFO 6864 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'

2020-05-12 23:30:12.218  INFO 6864 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729

2020-05-12 23:30:12.470  INFO 6864 --- [  restartedMain] o.s.b.web.embedded.netty.NettyWebServer  : Netty started on port(s): 8080

2020-05-12 23:30:12.475  INFO 6864 --- [  restartedMain] com.example.demo.DemoApplication         : Started DemoApplication in 1.683 seconds (JVM running for 2.171)

<=========----> 75% EXECUTING [52s]

> :bootRun

Curl example

$ curl -s http://localhost:8080/ids

123

$ curl -s http://localhost:8080

hello

$ curl -s http://localhost:8080?name=QQQ

hello QQQ