[JAVA] A memorandum when creating a REST service with Spring Boot


I will keep a memorandum when using REST services on Spring Web using STS. Mainly for myself. Spring Web is based on Spring Framework A web application framework.

The development environment is as follows. OS : Windows 7 Home Edition 64bit Java : JavaSE 8 update 181 Spring Boot : 2.3.4 STS : 4.6.1

STS setup

For the STS setup, I referred to My memorandum.

Creating a project

Create a project with Create new Spring Starter Project, The referenced libraries are as follows.

Creating an application

The created class, configuration file, and prepared data are as follows.

Spring Boot Execution class when the application starts.


package jp.co.illmatics;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

public class SpringWebSampleApplication {

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


This class is a REST API.

@RestController to make it a REST API, CORS @CrossOrigin to grant access Each was given.

The value that can be obtained is in JSON format. Details of the values will be explained later.


package jp.co.illmatics.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import jp.co.illmatics.dao.UserDao;
import jp.co.illmatics.model.User;

public class UsersController {

	private UserDao userInfoDao;

	@RequestMapping(method = RequestMethod.GET, value = "/users")
	public List<User> get() {
		return userInfoDao.getUserInfoList();

Data Access Object. Both the interface and its implementation classes are required at the time of implementation.


package jp.co.illmatics.dao;

import java.util.List;

import jp.co.illmatics.model.User;

public interface UserDao {

	public List<User> getUserInfoList();

UserDao implementation class. Defines a method to get a list of Users. ID column All items are acquired in ascending order.


package jp.co.illmatics.dao;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;

import jp.co.illmatics.model.User;

public class UserDaoImpl implements UserDao {

	private JdbcTemplate jdbcTemplate;

	public List<User> getUserInfoList() {
		List<User> list = jdbcTemplate.query("select * from USER_INFO ORDER BY ID"
			, new Object[] {},
			new RowMapper<User>() {
				public User mapRow(ResultSet rs, int rowNum) throws SQLException {
					User user = new User();
					return user;
		return list;

The model class for the USER_INFO table.


package jp.co.illmatics.model;

import javax.persistence.Table;

import org.springframework.stereotype.Component;

import lombok.Data;

@Table(name = "USER_INFO")
public class User {

	private String id;

	private String name;
	private Integer age;


DB connection information that stores test data.



This is the created table.

Created table

create table USER_INFO (
  "ID" varchar2(20), 
  "NAME" varchar2(20), 
  "AGE" number(3,0), 
  constraint "PK_USER" primary key ("ID")

This is the data prepared in the USER_INFO table.

user001 userName001 35
user002 userName002 30
user003 userName003 25

Operation check

I will try it. It's done. 実行結果.PNG

that's all. Until the end Thank you for reading.

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