[JAVA] Spring Boot Hello World in Eclipse

reference

I tried it by referring to "Spring Quickstart Guide" on the official page of Spring. https://spring.io/quickstart

environment

• Eclipse 2020 Windows 64bit
• Spring Boot

Create Spring project

Generate to your liking on the official Project Generation Page.

• Gradle
• Maven's pom file is not suitable for gender, so select Gradle as the build system
• Java 8
• I'm curious about Kotlin, but Java
• Version is the default setting
• Spring Boot 2.2.6
• This is appropriate
• Packaging Jar
• Considering that it is the Web, it is War, but I chose Jar as a trial

Press the GENERATE button to download the project as a zip.

Import project in eclipse

Import Gradle project

Specify the downloaded folder

Imported

If there is no problem, the necessary libraries will be downloaded and the build will be done without permission.

Run

When Spring Boot starts, it looks like this

Go to http: // localhost: 8080 /. I get an error because I haven't written the routing process yet.

Create a routing process

Add routing to the main class in your project.

Get request parameters with GET request

package com.pakhuncho.hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class HelloApplication {

	public static void main(String[] args) {
		SpringApplication.run(HelloApplication.class, args);
	}

	@GetMapping("/hello")
	public String hello(@RequestParam(value = "name", defaultValue = "World") String name) {
		return String.format("Hello %s!", name);
	}
}

Relocate the modified application.

Access at http: // localhost: 8080 / hello.

Access with http: // localhost: 8080 / hello? Name = pakhuncho.

http: // localhost: 8080 / hello? name = Access with Pakupaku

Get path parameters

package com.pakhuncho.hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class HelloApplication {

	public static void main(String[] args) {
		SpringApplication.run(HelloApplication.class, args);
	}

	@RequestMapping("/hello/{name}")
	public String hello(@PathVariable String name) {
		return String.format("Hello %s!", name);
	}
}

Access with http: // localhost: 8080 / hello / Pakupaku