[JAVA] Create API to send and receive Json data in Spring

• Java 8
• Eclipse Version: 2020-09
• Windows 10

It's been a while since I worked at Spring. Creating one API in Spring.

As a reminder, I will summarize up to model creation. By the way, Spring Boot was my first time.

specification

It receives the data posted in Json and returns the Json data in various ways.

Development environment

--Select Pleiades All in One Eclipse Download from https://mergedoc.osdn.jp/#pleiades.html Select Eclipse 2020> Windows 64bit> Java Full Edition

――It seems that 7-Zip is required, so download and install it as well. https://sevenzip.osdn.jp/

Project creation

--Open New Project Wither with "File> New> Project" Spring Boot> Select Spring Starter Project

--Java version is now 8 --In the dependency, Select Web-> Spring Web --Done

Implementation: Data definition

--Create classes (InputData, OutputData) that define input data and output data

InputData

package jp.co.sankosc.sample;

public class InputData {
	public int id;
	public String value;
}

OutputData

package jp.co.sankosc.sample;

import java.util.Date;

public class OutputData {
	public int id;
	public String value;
	public Date date;
}

Implementation: Processing

--Create ApiController class --Define @RestController annotation in class --Method definition (this time the method called post) --Define uri with @RequestMapping annotation in method --Define input parameters with @RequestBody annotation

ApiController

package jp.co.sankosc.sample;

import java.util.Date;

import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ApiController {
	
	@RequestMapping(value="/post", method=RequestMethod.POST)
	public OutputData post(@RequestBody InputData input) {
		OutputData output = new OutputData();
		output.id = input.id;
		output.value = input.value;
		output.date = new Date();
		return output;
	}

}

Run

--Select a project --Run> Run> Spring Boot Application

Verification

Confirmation command

$postData = @{id=123;value="InputData.Value"} | ConvertTo-Json -Compress
Invoke-WebRequest -Method Post -Uri http://localhost:8080/post -Body $postData -ContentType application/json

Execution result

StatusCode        : 200
StatusDescription :
Content           : {"id":123,"value":"InputData.Value","date":"2020-09-28T06:45:30.925+00:00"}

Jar file generation

--Select a project --Run> Run> Maven Install --Jar file is created under target

Run on server

java -jar [.jar file]

--Use this as a script to register the service