Play framework 2.0 -第一个应用程序
所有章节的翻译到此结束，实现一个小应用作为结束！
按照play2.0官网的例子编写第一个play Application ： todolist
步骤如下（详细的步骤及解释请查看原文）：
先编写控制器如下：
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)
编写一个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();
}
}
编写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">
}
}
最后改一下配置：
# 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
现在play run一下就可以看到效果了！
附件是程序源代码。