Playframework付属のサンプル'websocket-chat'を見てみる(1/4) ref: http://qiita.com/yyyske/items/d9e3cf69f7a6f5fb732b

Application.java

public static Result chatRoom(String username) {
    if(username == null || username.trim().equals("")) {
        flash("error", "Please choose a valid username.");
        return redirect(routes.Application.index());
    }
    return ok(chatRoom.render(username));
}

file3.java

flash("error", "Please choose a valid username.");

file6.txt

GET    /room    controllers.Application.chatRoom(username: String ?= null)

index.scala.html

@main(null) {

    @if(flash.containsKey("error")) {

        <div class="alert-message error">
            <p>
                <strong>Oops!</strong> @flash.get("error")
            </p>
        </div>

    }

    <div class="alert-message block-message info">
        <p>
            <strong>This is the Play Websocket sample application!</strong> 
            To start, choose a username and sign in using the top right form.
        </p>
    </div>
}

main.scala.html

@if(connected != null) {
    <p class="pull-right">
        Logged in as @connected —
        <a href="@routes.Application.index()">Disconnect</a>
    </p>
} else {
    <form action="@routes.Application.chatRoom()" class="pull-right">
        <input id="username" name="username" class="input-small" 
            type="text" placeholder="Username">
        <button class="btn" type="submit">Sign in</button>
    </form>
}

routes

# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~

# Home page
GET     /                                controllers.Application.index()
GET     /room                            controllers.Application.chatRoom(username: String ?= null)
GET     /room/chat                       controllers.Application.chat(username)
GET     /assets/javascripts/chatroom.js  controllers.Application.chatRoomJs(username)

# Map static resources from the /public folder to the /assets URL path
GET     /assets/*file                    controllers.Assets.at(path="/public", file)