Your first Play application

http://www.playframework.com/documentation/2.1.x/JavaTodoList

Play 2.1.2
아주 간단한 예제

> play new todolist //프로젝트 생성
> cd todolist
> play
[todolist] $ run

package controllers; import play.*; import play.mvc.*; import views.html.*; public class Application extends Controller { public static Result index() { // return ok(index.render("Your new application is ready.")); return ok("Hello world"); } }

There is no need to compile the code yourself or restart the server to see the modification. It is automatically reloaded when a change is detected.

- 라우팅 추가
conf/routes

# Home page
GET     /                             controllers.Application.index()
                               
# Tasks         
GET     /tasks                      controllers.Application.tasks()
POST    /tasks                    controllers.Application.newTask()
POST    /tasks/:id/delete       controllers.Application.deleteTask(id: Long)

public class Application extends Controller { public static Result index() { return ok(index.render("Your new application is ready.")); } public static Result tasks() { return TODO; } public static Result newTask() { return TODO; } public static Result deleteTask(Long id) { return TODO; } } public static Result index() { return redirect(routes.Application.tasks()); }
- Task 모델 package models; import java.util.List; import java.util.ArrayList; public class Task{ public Long id; public String label; public static List<Task> all(){ return new ArrayList<Task>(); } public static void create(Task task){ } public static void delete(Long id){ } }
- 템플릿 수정
index.scala.html
@(tasks: List[Task], taskForm: Form[Task]) @import helper._ @main("Todo list") { <h1>@tasks.size() task(s)</h1> <ul> @for(task <- tasks) { <li> @task.label @form(routes.Application.deleteTask(task.id)) { <input type="submit" value="Delete"> } </li> } </ul> <h2>Add a new task</h2> @form(routes.Application.newTask()) { @inputText(taskForm("label")) <input type="submit" value="Create"> } } import play.data.*; import views.html.*; import models.*; public class Application extends Controller { static Form<Task> taskForm = Form.form(Task.class); import play.data.validation.Constraints.*; public class Task { public Long id; @Required public String label;
- Rendering the first page public class Application extends Controller { ... public static Result tasks() { return ok( //200 OK views.html.index.render(Task.all(), taskForm) ); }

- form 전송 처리 public class Application extends Controller { ... public static Result newTask() { Form<Task> filledForm = taskForm.bindFromRequest(); if(filledForm.hasErrors()) { return badRequest( //400 Bad Request views.html.index.render(Task.all(), filledForm) ); } else { Task.create(filledForm.get()); return redirect(routes.Application.tasks()); } } - 데이터베이스 처리
conf/application

db.default.driver=org.h2.Driver
db.default.url="jdbc:h2:mem:play"
...
ebean.default="models.*"

서버 재시작할 필요없음.

EBean (Play’s default ORM) 사용 package models; import java.util.List; import java.util.ArrayList; import play.db.ebean.*; import play.data.validation.Constraints.*; import javax.persistence.*; @Entity public class Task extends Model{ @Id public Long id; @Required public String label; public static Finder<Long, Task> find = new Finder( Long.class, Task.class ); public static List<Task> all(){ // return new ArrayList<Task>(); return find.all(); } public static void create(Task task){ task.save(); } public static void delete(Long id){ find.ref(id).delete(); } }
- 삭제 기능 public class Application extends Controller { public static Result deleteTask(Long id){ // return TODO; Task.delete(id); return redirect(routes.Application.tasks()); }
- Heroku에 배포
...다음 기회에