Springboot APIs creation help

Application Programming Interface (API) is a software interface that allows two applications to interact with each other without any user intervention. API is a collection of software functions and procedures. In simple terms, API means a software code that can be accessed or executed. API is defined as a code that helps two different software’s to communicate and exchange data with each other.

SpringBoot :

Spring Boot is an open source Java-based framework used to create a micro Service. It is developed by Pivotal Team and is used to build stand-alone and production ready spring applications.

A simple API using SpringBoot:

Step 1. Firstly we will create java spring boot project using website . I am selecting maven project with java and spring boot2.1.3 . After that Fill Group , Artifact details and click generate project

.

Step 2: After Click Generate project button it will download java spring boot project for you. Now you extract this zip and import in eclipse . After import java spring boot project in eclipse , application structure such as.

HelloWorldApplication.java

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

Now we will create one rest controller which consume request and produce response for us.

HelloController.java

package com.jp.helloWorld.controller;
 
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
 public class HelloController {
 
 
  @GetMapping("/app")
  public String getApplicationName(){
  return "Application api call succsfully";
  }
  }

pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.3.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.jp</groupId><artifactId>helloWorld</artifactId><version>0.0.1-SNAPSHOT</version><name>helloWorld</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

Now run application by run HelloWorldApplication.java as java project and open url in your browser or any rest client http://localhost:8080/app , you will got response of your api as.