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STS SpringBootでデータベースからJSON形式でデータを取得する方法

Last updated at Posted at 2019-02-22

#データベース
[user_basic]
String email
String password
String nickname
int point
int rank
int age
String entryDate
String lastDateTime
loginState

#GETででデータベースから複数でデータをJSONで取得する方法

Test3Controller.java
package com.example.controller;

import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Test3Controller {
	@Autowired
	NamedParameterJdbcTemplate jdbcTemplate;
	
	//GET 指定したPointとRank以上のユーザーの情報を全件取得する
	//"http://localhost:8080/{point}/{rank}/test3"で呼び出されるメソッド
	@RequestMapping(value = "{point}/{rank}/test3", method = RequestMethod.GET)
	List<Map<String,Object>> findGet(@PathVariable String point, @PathVariable String rank) {
		//SQL文を用意
		final String sql = "SELECT * FROM user_basic WHERE Point >= :point AND Rank >= :rank";
		//SQLで送るパラメーターをセット
		SqlParameterSource param = new MapSqlParameterSource().addValue("point", point).addValue("rank", rank);
		//空のJSONを用意
		List<Map<String,Object>> json = null;
		
		try {
			//SQLを実行して結果をJSONで受け取る
			json = jdbcTemplate.queryForList(sql, param);
		} catch(EmptyResultDataAccessException e) {
			e.printStackTrace();
		}
		
		return json;
	}
}

GETで以下のURLを実行
http://localhost:8080/{point}/{rank}/test3

出力結果
[
	{
		"Email": "aa@example.com",
		"Password": "pass",
		"NickName": "ace99",
		"Point": 400,
		"Rank": 0,
		"Age": 12,
		"EntryDate": 1508905785000,
		"LastDateTime": 1513581368000,
		"LoginState": 1
	},
	{
		"Email": "bb@example.com",
		"Password": "pass",
		"NickName": "boo",
		"Point": 800,
		"Rank": 0,
		"Age": 3,
		"EntryDate": 1508908501000,
		"LastDateTime": 1513578217000,
		"LoginState": 0
	},
	{
		"Email": "cc@example.com",
		"Password": "pass",
		"NickName": "candy",
		"Point": 4500,
		"Rank": 0,
		"Age": 23,
		"EntryDate": 1508138433000,
		"LastDateTime": 1513225262000,
		"LoginState": 0
	},
	{
		"Email": "dd@example.com",
		"Password": "pass",
		"NickName": "demon",
		"Point": 100,
		"Rank": 0,
		"Age": 14,
		"EntryDate": -30609824400000,
		"LastDateTime": 1508137642000,
		"LoginState": 1
	}
]

#POSTでデータベースから1件のデータをJSONで取得する方法

Test2Controller.java
package com.example.controller;

import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Test2Controller {
	@Autowired
	NamedParameterJdbcTemplate jdbcTemplate;
	
    //POST 指定したEmailとPassWordと一致するユーザーの情報を1件取得する
    //"http://localhost:8080/test2"で呼び出されるメソッド
    @RequestMapping(value = "test2", method = RequestMethod.POST)
    Map<String,Object> findPost(@RequestParam String email, String password) {
		//SQL文を用意
		final String sql = "SELECT * FROM user_basic WHERE Email = :email AND PassWord = :password";
		//SQLで送るパラメーターをセット
		SqlParameterSource param = new MapSqlParameterSource().addValue("email", email).addValue("password", password);
		//空のJSONを用意
		List<Map<String,Object>> json = null;
		
		try {
			//SQLを実行して結果をJSONで受け取る
			json = jdbcTemplate.queryForList(sql, param);
		} catch(EmptyResultDataAccessException e) {
			e.printStackTrace();
		}
		
		return json.get(0);
	}
}

POSTで以下のURLを実行(送るパラメーター: email=aa@example.com, password=pass)
http://localhost:8080/test2

出力結果
{
	"Email": "aa@example.com",
	"Password": "pass",
	"NickName": "ace99",
	"Point": 400,
	"Rank": 0,
	"Age": 12,
	"EntryDate": 1508905785000,
	"LastDateTime": 1513581368000,
	"LoginState": 1
}
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