所有章節的翻譯到此結束，實現一個小應用作爲結束！
按照play2.0官網的例子編寫第一個play Application ： todolist
步驟如下（詳細的步驟及解釋請查看原文）：
先編寫控制器如下：
aplication.java
package controllers;
import play.*;
import play.data.*;
import play.mvc.*;
import models.*;
import views.html.*;
public class Application extends Controller {
static Form<Task> taskForm = form(Task.class);
public static Result index() {
//return ok(index.render("Your new application is ready."));
return redirect(routes.Application.tasks());
}
public static Result tasks() {
return ok(
views.html.index.render(Task.all(), taskForm)
);
}
public static Result newTask() {
Form<Task> filledForm = taskForm.bindFromRequest();
if(filledForm.hasErrors()) {
return badRequest(
views.html.index.render(Task.all(), filledForm)
);
} else {
Task.create(filledForm.get());
return redirect(routes.Application.tasks());
}
}
public static Result deleteTask(Long id) {
Task.delete(id);
return redirect(routes.Application.tasks());
}
}
修改routes：
# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~
# 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)
# Map static resources from the /public folder to the /assets URL path
GET /assets/*file controllers.Assets.at(path="/public", file)
編寫一個model（用到了Ebean，需要在application.conf中配置）：
Task.java
package models;
import java.util.*;
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 find.all();
}
public static void create(Task task) {
task.save();
}
public static void delete(Long id) {
find.ref(id).delete();
}
}
編寫views：
main.scala.html
@(title: String)(content: Html)
<!DOCTYPE html>
<html>
<head>
<title>@title</title>
<link rel="stylesheet" media="screen" href="@routes.Assets.at("stylesheets/main.css")">
<link rel="shortcut icon" type="image/png" href="@routes.Assets.at("images/favicon.png")">
<script src="@routes.Assets.at("javascripts/jquery-1.7.1.min.js")" type="text/javascript"></script>
</head>
<body>
@content
</body>
</html>
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">
}
}
最後改一下配置：
# This is the main configuration file for the application.
# ~~~~~
# Secret key
# ~~~~~
# The secret key is used to secure cryptographics functions.
# If you deploy your application to several instances be sure to use the same key!
application.secret="@8DeN:VCjdHS7g2Y=L0et:x/e8DseMHvPLvEnYqRy@R[o2V[f547@wyV/o^K@56i"
# The application languages
# ~~~~~ 中文
application.langs="zh"
# Global object class
# ~~~~~
# Define the Global object class for this application.
# Default to Global in the root package.
# global=Global
# Database configuration
# ~~~~~
# You can declare as many datasources as you want.
# By convention, the default datasource is named `default`
#使用h2
db.default.driver=org.h2.Driver
db.default.url="jdbc:h2:mem:play"
# db.default.user=sa
# db.default.password=
#
# You can expose this datasource via JNDI if needed (Useful for JPA)
# db.default.jndiName=DefaultDS
# Evolutions
# ~~~~~
# You can disable evolutions if needed
# evolutionplugin=disabled
# Ebean configuration
# ~~~~~
# You can declare as many Ebean servers as you want.
# By convention, the default server is named `default`
# 使用Ebean
ebean.default="models.*"
# Logger
# ~~~~~
# You can also configure logback (http://logback.qos.ch/), by providing a logger.xml file in the conf directory .
# Root logger:
logger.root=ERROR
# Logger used by the framework:
logger.play=INFO
# Logger provided to your application:
logger.application=DEBUG
現在play run一下就可以看到效果了！
附件是程序源代碼。