java - onmessage Google App Engine (Java) channel API

Question

我正在尝试使用 Google App Engine 的 Channel API。

JavaScript/JQuery:

$(document).ready(function(){
    alert('ready');

    $.post('/token', function(data) {
        alert('token:' + data['token']);
        openChannel( data['token'] );
    });

    $.post('/chat', function(data) {
        alert('chat:' + data['users'].length);
    });

});


onMessage = function(message) {
    alert(message);
}

onSocketError = function(error){
    alert("Error is <br/>"+error.description+" <br /> and HTML code"+error.code);
};

onSocketOpen = function() {
    // socket opened
};

onSocketClose = function() {
    alert("Socket Connection closed");
};

openChannel = function(token) {
    alert('open channel');
    var channel = new goog.appengine.Channel( token );
    var socket = channel.open();
    socket.onopen = onSocketOpen;
    socket.onmessage = onMessage;
    socket.onerror = onSocketError;
    socket.onclose = onSocketClose;
};

问题是警报(消息)没有触发。我的代码中有什么幸运的地方？

我对服务器端具有 "\\{\\{ token\\}\\}" 和 channel = new goog.appengine.Channel(' 的一些示例感到困惑JavaScript 中的 {{ token }}')。

{{ }} 中包含的内容是什么？

Answer 1

请注意 token 是标识您的页面的 token key 。首先在页面中初始化 token ，例如:

 ChannelService channelService = ChannelServiceFactory.getChannelService();
 String token = channelService.createChannel("sample");

现在

var token ="<%=token %>";// This will creaete unique identifier(some id created by google api + ur key)

channel = new goog.appengine.Channel('<%=token%>');    
    socket = channel.open();    

    socket.onopen = function () {
        var connected = true;  
        sendMessage('<b>'+userName+'</b> Logged in.');
    };

..创建这样的函数