603 - Create API

[njtalba5127]

Timestamp: (603) 603 / 1023

[njtalba5127]

open spring boot project generated from initialisr to ur preferred editors.

they use intelliJ

i use vscode

[njtalba5127]

ok lets first create a very simple api without the use of any database first

[njtalba5127]

create new java file called "GreetingsController.java"

.
.
└── backend
    ├── HELP.md
    ├── mvnw
    ├── mvnw.cmd
    ├── pom.xml
    ├── src
    │   ├── main
    │   │   ├── java
    │   │   │   └── com
    │   │   │       └── nellyxinwei
    │   │   │           └── backend
    │   │   │               ├── BackendApplication.java
    │   │   │               └── GreetingsController.java

package com.nellyxinwei.backend;

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/v1/greetings")
public class GreetingsController {

  @GetMapping
  public ResponseEntity<String> sayHello() {
    return ResponseEntity.ok("Hello from our API");
  }

  @GetMapping("/say-good-bye")
  public ResponseEntity<String> sayGoodbye() {
    return ResponseEntity.ok("Goodbye and see you later");
  }

}

[njtalba5127]

lets us now test our api using any http client ex: postman or vscode's thunder-client extension. you can even use ur browser just for get requests like these.

thunder-client:

GET
http://localhost:8080/api/v1/greetings

output:

Hello from our API

---

thunder-client:

GET
http://localhost:8080/api/v1/greetings/say-good-bye

output:

Goodbye and see you later