Javaフレームワーク「Play Framework」でWeb APIを作成する（2）

db.default.driver=org.h2.Driver
db.default.url="jdbc:h2:mem:play"
db.default.user=sa
db.default.password=""

libraryDependencies += guice
libraryDependencies += "com.h2database" % "h2" % "1.4.199"

h2-browser

ebean.default="models.*"

package models;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.validation.constraints.NotNull;

import io.ebean.Finder;
import io.ebean.Model;

@Entity
public class PlayEBean extends Model {
   @Id
   public Long id;

   @NotNull
   public String userName;

   public Long age;

   public static Finder<Long, PlayEBean> find = 
	        new Finder<Long, PlayEBean>(PlayEBean.class);
}

lazy val root = (project in file(".")).enablePlugins(PlayJava, PlayEbean)
・・・（中略）
libraryDependencies ++= Seq(
      guice,
      jdbc,
      "com.h2database" % "h2" % "1.4.199",
      // To provide an implementation of JAXB-API, which is required by Ebean.
      "javax.xml.bind" % "jaxb-api" % "2.3.1",
      "javax.activation" % "activation" % "1.1.1",
      "org.glassfish.jaxb" % "jaxb-runtime" % "2.3.2",
      )

package controllers;

import java.util.List;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import io.ebean.Finder;
import models.PlayEBean;
import play.mvc.Controller;
import play.mvc.Http;
import play.mvc.Result;

public class HomeController extends Controller {

    public Result index() {
        return ok(views.html.index.render());
    }
  
  // 参照  
	public Result select(Long id) {

		Finder<Long, PlayEBean> finder = new Finder<Long, PlayEBean>(PlayEBean.class);

		// JSON変換用クラス
		ObjectMapper mapper = new ObjectMapper();
		String js = "";

		if (id == 0) {
			List<PlayEBean> list = finder.all();
			
			try {
				// JSON文字列に変換
				js = mapper.writeValueAsString(list);
			} catch (JsonProcessingException e) {
				e.printStackTrace();
			}
		} else {
			PlayEBean dto = finder.byId(id);

			try {
				// JSON文字列に変換
				js = mapper.writeValueAsString(dto);
			} catch (JsonProcessingException e) {
				e.printStackTrace();
			}
		}
		return ok(js).as("application/json");
	}

	// 登録
	public Result create(Http.Request request) {

		JsonNode json = request.body().asJson();
		PlayEBean dto = new PlayEBean();
		dto.userName = json.get("name").textValue();
		dto.age = json.get("age").longValue();
		dto.save();

		// JSON変換用クラス
		ObjectMapper mapper = new ObjectMapper();
		String js = "";
		try {
			// JSON文字列に変換
			js = mapper.writeValueAsString(dto);
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		}
		
		return ok(js).as("application/json");
	}

	// 更新
	public Result update(Long id, Http.Request request) {

		JsonNode json = request.body().asJson();

		Finder<Long, PlayEBean> finder = new Finder<Long, PlayEBean>(PlayEBean.class);
		PlayEBean dto = finder.byId(id);
		dto.userName = json.get("name").textValue();
		dto.age = json.get("age").longValue();
		dto.update();

		return select(id);
	}

	// 削除
	public Result delete(Long id) {

		Finder<Long, PlayEBean> finder = new Finder<Long, PlayEBean>(PlayEBean.class);
		PlayEBean dto = finder.byId(id); // Id=3の対象を検索
		dto.delete();

		return ok("user deleted");
	}
}

# 参照（全件）用メソッド
GET     /Users           controllers.HomeController.select(id: Long=0)
# 参照（1件）用メソッド
GET     /Users/:id       controllers.HomeController.select(id: Long)
# 登録用メソッド
POST    /Users           controllers.HomeController.create(request: Request)
# 更新用メソッド
PUT     /Users/:id       controllers.HomeController.update(id: Long, request: Request)
# 削除用メソッド
DELETE  /Users/:id       controllers.HomeController.delete(id: Long)

sbt run

{
    "name": "柚木 絢乃",
    "age": 26
}

{
    "name": "かまど たんじろう",
    "age": 15
}