Maven + Spring @RestController 사용 기초

사용 환경

• Windows 10
• Java 1.8
• Maven 3.8.2
• Spring 5.0.6

Hello 프로젝트 따라하기

1. 프로젝트 생성

   브라우져에서 spring initializr를 방문하여 아래와 같이 입력하고 GENERATE 버튼을 클릭합니다.

   • Project: Maven Project
   • Language: Java
   • Spring Boot: 2.5.4
   • Project Meta:
     • Group: trvoid
     • Artifact: rest
     • Name: rest
     • Package name: trvoid
     • Packaging: Jar
     • Java: 8
   • Dependencies: Spring Web

   생성된 프로젝트 파일을 다운로드하여 압축을 풉니다. 프로젝트 폴더 구조는 아래와 같습니다.

   hello
     |-src
       |-main
         |-java
           |-trvoid
             |-RestApplication.java
       |-test
         |-java
           |-trvoid
             |-RestApplicationTests.java
     |-pom.xml
   

   pom.xml 파일에서 의존성 항목과 빌드 플러그인을 확인할 수 있습니다.

   <dependencies>
       <dependency>  
           <groupId>org.springframework.boot</groupId>  
           <artifactId>spring-boot-starter-web</artifactId>
       </dependency>
   </dependencies>
   
   <build>
       <plugins>
           <plugin>  
               <groupId>org.springframework.boot</groupId>  
               <artifactId>spring-boot-maven-plugin</artifactId>  
           </plugin>
       </plugins>
   </build>
   

   RestApplication.java 파일의 내용은 아래와 같습니다.

   package trvoid;
   
   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   
   @SpringBootApplication
   public class RestApplication {
   
       public static void main(String[] args) {
           SpringApplication.run(RestApplication.class, args);
       }
   
   }
   

2. 컨트롤러 추가

   src/main/java/trvoid/Greeting.java

   package trvoid;
   
   public class Greeting {
       private String to;
       private String message;
   
       public Greeting(String to, String message) {
           this.to = to;
           this.message = message;
       }
   
       // getters and setters
   }
   

   src/main/java/trvoid/HelloController.java

   package trvoid;  
   
   import org.springframework.web.bind.annotation.GetMapping;  
   import org.springframework.web.bind.annotation.PathVariable;  
   import org.springframework.web.bind.annotation.RestController;  
   
   @RestController  
   public class HelloController {  
       @GetMapping(value="/{name}")  
       public Greeting sayHello(@PathVariable String name) {  
           return new Greeting("Server", name, "Hello");  
       } 
   }
   

3. 컴파일

   >mvn compile
   

4. 실행

   >mvn exec:java -Dexec.mainClass=trvoid.RestApplication
   

   실행 결과

   ...
     .   ____          _            __ _ _
    /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
   ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
    \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
     '  |____| .__|_| |_|_| |_\__, | / / / /
    =========|_|==============|___/=/_/_/_/
    :: Spring Boot ::                (v2.5.4)
   
   2021-09-08 10:45:34.564  INFO 39908 --- [lication.main()] trvoid.RestApplication                   : Starting RestApplication using Java 1.8.0_261 on DESKTOP-NBBJSSF with PID 39908 (D:\DevTest\Spring\rest-maven\target\classes started by WISECAN in D:\DevTest\Spring\rest-maven)
   2021-09-08 10:45:34.564  INFO 39908 --- [lication.main()] trvoid.RestApplication                   : No active profile set, falling back to default profiles: default
   2021-09-08 10:45:35.142  INFO 39908 --- [lication.main()] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
   2021-09-08 10:45:35.157  INFO 39908 --- [lication.main()] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
   2021-09-08 10:45:35.157  INFO 39908 --- [lication.main()] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.52]
   2021-09-08 10:45:35.204  INFO 39908 --- [lication.main()] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
   2021-09-08 10:45:35.204  INFO 39908 --- [lication.main()] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 617 ms
   2021-09-08 10:45:35.563  INFO 39908 --- [lication.main()] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
   2021-09-08 10:45:35.614  INFO 39908 --- [lication.main()] trvoid.RestApplication                   : Started RestApplication in 1.292 seconds (JVM running for 16.457)
   

5. 브라우져로 REST API 호출 결과 확인

   브라우져에서 주소창에 http://localhost:8080/홍길동을 입력하고 엔터를 치면 아래와 같은 결과를 얻습니다.

   {"to":"홍길동","message":"Hello from Server"}
   

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