blocks|key|4392133|text|您可以使用HTMl5服务器-send选项。您可以在此处获取更多详细信息|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4392134|服务器-发送选项:|offset|length|style|BOLD|4392135|http://www.w3schools.com/html/html5_serversentevents.asp|4392136|用于服务器的Java+servelt+-发送:|4392137|Java+servlet+and+server+sent+events|4392138|教程:|4392139|http://peaktechie.blogspot.in/2012/04/small-tutorial-on-html5-server-sent.html|4392140|HTML5支持的浏览器:|4392141|http://fmbip.com/litmus|4392142|entityMap|0|LINK|mutability|MUTABLE|url|1|https://stackoverflow.com/questions/6466713/java-servlet-and-server-sent-events|2|3^0|0|0|9|0|0|1K|0|0|6|H|0|0|Z|1|0|0|3|0|0|26|2|0|0|C|0|0|N|3|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@$D|18|E|19|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@$D|1B|E|1C|1|1D]]|A|$]]|$1|J|3|K|5|6|7|1E|8|@$D|1F|E|1G|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1H|8|@]|9|@$D|1I|E|1J|1|1K]]|A|$]]|$1|N|3|O|5|6|7|1L|8|@$D|1M|E|1N|F|G]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1O|8|@]|9|@$D|1P|E|1Q|1|1R]]|A|$]]|$1|R|3|S|5|6|7|1S|8|@$D|1T|E|1U|F|G]]|9|@]|A|$]]|$1|T|3|U|5|6|7|1V|8|@]|9|@$D|1W|E|1X|1|1Y]]|A|$]]|$1|V|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]]|W|$X|$5|Y|Z|10|A|$11|I]]|12|$5|Y|Z|10|A|$11|13]]|14|$5|Y|Z|10|A|$11|Q]]|15|$5|Y|Z|10|A|$11|U]]]]

You can use HTMl5 server-send option.
Here you can get more details

Server-Send option :

<a href="http://www.w3schools.com/html/html5_serversentevents.asp" rel="nofollow noreferrer">http://www.w3schools.com/html/html5_serversentevents.asp</a>

Java servelt for server-send :

<a href="https://stackoverflow.com/questions/6466713/java-servlet-and-server-sent-events">Java servlet and server sent events</a>

Tutorial :

<a href="http://peaktechie.blogspot.in/2012/04/small-tutorial-on-html5-server-sent.html" rel="nofollow noreferrer">http://peaktechie.blogspot.in/2012/04/small-tutorial-on-html5-server-sent.html</a>

HTML5 supported browsers :

<a href="http://fmbip.com/litmus" rel="nofollow noreferrer">http://fmbip.com/litmus</a>

blocks|key|4392188|text|我使用Atmosphere来做这件事。如果浏览器支持，它将使用WebSockets，如果浏览器不支持，它将很好地回退到轮询。他们也有一个很好的jQuery插件，让生活变得简单。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4392189|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Atmosphere/atmosphere^0|3|A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I used <a href="https://github.com/Atmosphere/atmosphere">Atmosphere</a> to do this. It uses WebSockets if they are supported by the browser, and falls back nicely to polling when not. They also have a nice jQuery plugin to make life simple.

blocks|key|2279842|text|如果您可以升级到JDK7或正在使用JDK7，我建议您使用Vert.x+Vertx.io，在客户端使用Sockjs。Vert.x有一个完整的sockjs服务器实现，我将尝试提出一种实现的方法，其余的请参阅文档。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2279843|服务器实现可能如下所示|2279844|++++Vertx+vertx+=+Vertx.newVertx();
++++EventBus+eventBus+=+vertx.eventBus()
++++HttpServer+server+=+vertx.createHttpServer();
++++JsonArray+permitted+=+new+JsonArray();
++++permitted.add(new+JsonObject());
++++SockJSServer+sockJSServer+=+new+DefaultSockJSServer(vertx,+server);
++++sockJSServer.bridge(new+JsonObject().putString("prefix",+"/pusher"),+permitted,+permitted);
++++server.listen(<some+port>);|code-block|syntax|javascript|2279845|在客户端，注册一个处理程序，比如加载文档|2279846|+function+()+{
if+(!eb)+{
++eb+=+new+vertx.EventBus("http://<your_host>:<your_port>/pusher");

++eb.onopen+=+function()+{
+++console.log("connected")
++};

++eb.onclose+=+function()+{
++++console.log("Not+connected");
++++eb+=+null;
++};
}|2279847|}|2279848|然后，您可以将处理程序注册到任何地址-此处的地址可以是任何内容，假设它是"AwesomeNotifications“|2279849|function+subscribe(address)+{
if+(eb)+{
++eb.registerHandler(address,+function(msg,+replyTo)+{
++console.log("Reply+recieved")
++++++++++});

}
}|2279850|完成所有这些设置后，您现在可以使用前面创建的事件总线将任何数据从服务器推送到此地址|2279851|eventBus.publish("AwesomeNotifications",+new+JsonObject(<some+hashmap+to+serialize>))|2279852|希望这能有所帮助|2279853|entityMap|0|LINK|mutability|MUTABLE|url|http://vertx.io/^0|Z|8|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|D|3|E|5|6|7|1C|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1D|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1E|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|1F|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|1G|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1H|8|@]|9|@]|C|$]]|$1|S|3|T|5|H|7|1I|8|@]|9|@]|C|$I|J]]|$1|U|3|V|5|6|7|1J|8|@]|9|@]|C|$]]|$1|W|3|X|5|H|7|1K|8|@]|9|@]|C|$I|J]]|$1|Y|3|Z|5|6|7|1L|8|@]|9|@]|C|$]]|$1|10|3|-4|5|6|7|1M|8|@]|9|@]|C|$]]]|11|$12|$5|13|14|15|C|$16|17]]]]

If you can upgrade to or are using JDK 7 I suggest using Vert.x <a href="http://vertx.io/">Vertx.io</a> , use Sockjs on the client side. Vert.x has a complete sockjs server implementation, I ll try to suggest a way to implement this, for the rest please look at the Docs

The server implementation could be like this

<pre><code> Vertx vertx = Vertx.newVertx();
 EventBus eventBus = vertx.eventBus()
 HttpServer server = vertx.createHttpServer();
 JsonArray permitted = new JsonArray();
 permitted.add(new JsonObject());
 SockJSServer sockJSServer = new DefaultSockJSServer(vertx, server);
 sockJSServer.bridge(new JsonObject().putString("prefix", "/pusher"), permitted, permitted);
 server.listen(&lt;some port&gt;);
</code></pre>

On the client side register a handler like so on document load

<pre><code> function () {
if (!eb) {
 eb = new vertx.EventBus("http://&lt;your_host&gt;:&lt;your_port&gt;/pusher");

 eb.onopen = function() {
 console.log("connected")
 };

 eb.onclose = function() {
 console.log("Not connected");
 eb = null;
 };
}
</code></pre>

}

You can then register a handler to any address - address here can be anything , assume it is "AwesomeNotifications" 

<pre><code>function subscribe(address) {
if (eb) {
 eb.registerHandler(address, function(msg, replyTo) {
 console.log("Reply recieved")
 });

}
}
</code></pre>

Once you have this all set up , you can now push any data from the server to this address using the event bus we created earlier

<pre><code>eventBus.publish("AwesomeNotifications", new JsonObject(&lt;some hashmap to serialize&gt;))
</code></pre>

Hope this helps

blocks|key|2279933|text|我建议你使用Long+Polling，也就是Comet。我用它来向客户抛出随机数。你也可以参考this问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2279934|entityMap|0|LINK|mutability|MUTABLE|url|http://techoctave.com/c7/posts/60-simple-long-polling-example-with-javascript-and-jquery|1|https://stackoverflow.com/questions/333664/simple-long-polling-example-code^0|M|5|6|C|0|1B|4|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]|$9|V|A|W|1|X]]|E|$]]|$1|F|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]|N|$5|I|J|K|E|$L|O]]]]

I'd suggest you go with <a href="http://techoctave.com/c7/posts/60-simple-long-polling-example-with-javascript-and-jquery" rel="nofollow noreferrer">Long Polling</a> aka <code>Comet</code>. I've used it to throw random numbers to the client. You can also refer to <a href="https://stackoverflow.com/questions/333664/simple-long-polling-example-code">this</a> question.

blocks|key|5808154|text|我最近一直在调查这个问题。基于事件的方法是构建单页面web应用程序的一个很好的方法，但也可以用于多页面web应用程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5808155|有许多方法可以做到这一点：|5808156|5808157|ActiveMQ+AJAX+-在浏览器中直接从javascript发布和订阅JMS事件。这是非常基本的，比其他方法更简单，但是因为它的简单性，如果你a)已经使用了activemq，b)像没有太多的基于abstraction|unordered-list-item|offset|length|5808158|Atmosphere事件的框架层，可以自动检测基于哪个are服务器和哪个浏览器当前正在使用的最佳通信机制。一个非常好的框架，它支持全面的browsers+and+web+severs,+even+down+to+IE6。还有examples+of+using+Atmosphere+with+spring+MVC+and+Spring+Integration.|5808159|Cometd+-基于jetty/hightide的Bayeux协议的实现(自动协商最佳连接类型)。Jetty是第一个支持continuations的java+was服务器，现在是最新的Servlet规范的一部分。Cometd将Jetty与JS客户端库打包在一起，用于自动检测到browser.|5808160|Vert.x的最佳连接机制-一个基于事件的服务器平台，您可以在其上构建。最近，当Vert.x的作者离开VMware时，围绕它有一些争议，但VMware保留了这个项目。现在看来，版本2将从Eclipse+Foundation发布。看起来很有前途，但水平很低。不是那种你只是插入到现有的基于app.|5808161|HTML5+EventSource标准的java+web向浏览器发送事件的方式。没有将事件发送回服务器的机制。这很有趣，但考虑到您需要实现IE6、IE7和IE8的后备，目前可能不是您的最佳选择。|5808162|5808163|最终，我认为对于问题的作者来说，集成到spring-mvc项目中，Atmosphere显然是最合适的。|5808164|编辑:打字错误|5808165|entityMap|0|LINK|mutability|MUTABLE|url|https://activemq.apache.org/ajax.html|1|https://github.com/Atmosphere/atmosphere/wiki|2|https://github.com/Atmosphere/atmosphere/wiki/Supported-WebServers-and-Browsers|3|https://github.com/ghillert/spring-atmosphere-samples|4|http://cometd.org/|5|http://vertx.io/|6|http://www.html5rocks.com/en/tutorials/eventsource/basics/|7|/questions/tagged/spring-mvc^0|0|0|0|0|D|0|0|0|A|1|1W|15|2|34|1V|3|0|0|6|4|0|0|6|5|0|0|H|6|0|0|J|A|7|0|0^^$0|@$1|2|3|4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1J|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|1L|8|@]|9|@$H|1M|I|1N|1|1O]]|A|$]]|$1|J|3|K|5|G|7|1P|8|@]|9|@$H|1Q|I|1R|1|1S]|$H|1T|I|1U|1|1V]|$H|1W|I|1X|1|1Y]]|A|$]]|$1|L|3|M|5|G|7|1Z|8|@]|9|@$H|20|I|21|1|22]]|A|$]]|$1|N|3|O|5|G|7|23|8|@]|9|@$H|24|I|25|1|26]]|A|$]]|$1|P|3|Q|5|G|7|27|8|@]|9|@$H|28|I|29|1|2A]]|A|$]]|$1|R|3|-4|5|6|7|2B|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|2C|8|@]|9|@$H|2D|I|2E|1|2F]]|A|$]]|$1|U|3|V|5|6|7|2G|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|2H|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]|14|$5|Z|10|11|A|$12|15]]|16|$5|Z|10|11|A|$12|17]]|18|$5|Z|10|11|A|$12|19]]|1A|$5|Z|10|11|A|$12|1B]]|1C|$5|Z|10|11|A|$12|1D]]|1E|$5|Z|10|11|A|$12|1F]]|1G|$5|Z|10|11|A|$12|1H]]]]

I've been looking into this recently. An event based approach is a great wasy to structure single page web apps, but can be used in multipage webapps too.

There are a number of ways to do this:

<ul>
<li><a href="https://activemq.apache.org/ajax.html">ActiveMQ AJAX</a> - publish and subscribe to JMS events directly from javascript in the browser. This is quite basic, with less bells and whistles than the other approaches, but because of it's simplicity, might be a good base to start with if you a) already use activemq, b) like not having too many layers of abstraction</li>
<li><a href="https://github.com/Atmosphere/atmosphere/wiki">Atmosphere</a> - Event based framework, can auto detected the best communication mechanism based on which webserver and which broswer are currently in use. A pretty nice framework, which supports a full spread of <a href="https://github.com/Atmosphere/atmosphere/wiki/Supported-WebServers-and-Browsers">browsers and web severs, even down to IE6</a>. And there are <a href="https://github.com/ghillert/spring-atmosphere-samples">examples of using Atmosphere with spring MVC and Spring Integration</a>.</li>
<li><a href="http://cometd.org/">Cometd</a> - An implementation of the Bayeux protocol (to auto-negotiate the best connection type) based on jetty/hightide. Jetty was the first java webserver to support continuations, now part of the latest Servlet spec. Cometd take Jetty and wraps it up with JS client libraries for autodetection of the best connection mechanism to the browser.</li>
<li><a href="http://vertx.io/">Vert.x</a> - An event based server platform that you can build on top of. There has been some controversy around Vert.x recently when it's author left VMware, but VMware retained the project. It now looks like version 2 will be released from the Eclipse Foundation. Seems very promising, but quite low level. Not the kind of thing you just plug into an existing java web app.</li>
<li><a href="http://www.html5rocks.com/en/tutorials/eventsource/basics/">HTML5 EventSource</a> - Standards based way of sending events to the browser. No mechanism for sending events back to the server. It's interesting, but given you need to implment a fallback for IE6, IE7 and IE8, it might not be your best choice, for now.</li>
</ul>

Ulimately, I think for the author the of question, integrating to a <a href="/questions/tagged/spring-mvc" class="post-tag" title="show questions tagged 'spring-mvc'" rel="tag">spring-mvc</a> project, Atmosphere is clearly the best fit.

Edit: typos

blocks|key|5808227|text|我的建议是使用基于发布-订阅的MQTT中间件或XMPP协议。如果您计划发送小块消息，那么使用MQTT将是最合适的，因为它是最轻量级的方式。它有很多客户端库，包括javascript，非常容易开发和管理。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5808228|entityMap|0|LINK|mutability|MUTABLE|url|http://mqtt.org/software^0|F|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

My suggestion would be to use either publish-subscribe based <a href="http://mqtt.org/software" rel="nofollow">MQTT</a> middleware or XMPP protocol. If you are planning to send small chunks of messages, then it will be most appropriate to use MQTT because it is the most lightweight way to go. It has lots of client libraries including javascript and very easy to develop and manage.

blocks|key|4392464|text|我们已经使用XMPP很长一段时间来支持推送通知了，但是管理一个Ejabber服务器(或者其他)是非常困难的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4392465|此外，实际上我们已经转移到了有客户端和服务器实现的socket.io，但你必须管理nodejs服务器并开始使用js。|4392466|我还在一个项目中测试过faye，并且在Ruby环境下工作得很好。|4392467|但最后，我认为更好的解决方案是使用一个可以嵌入到服务器中的库(java)，而忽略其他技术，我认为Atmosphere也是一个很好的客户端和服务器的解决方案。|4392468|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ejabberd.im/|1|http://socket.io/|2|http://faye.jcoglan.com/|3|https://github.com/Atmosphere/atmosphere^0|V|7|0|0|P|9|1|0|B|4|2|0|1C|A|3|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|F|3|G|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|H|3|I|5|6|7|19|8|@]|9|@$A|1A|B|1B|1|1C]]|C|$]]|$1|J|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]|T|$5|M|N|O|C|$P|U]]|V|$5|M|N|O|C|$P|W]]]]

We have used XMPP for a long time to support push notifications, but mantain an <a href="http://www.ejabberd.im/" rel="nofollow">Ejabber</a> server (or whatever) is very dificult.

Also, actualy we have moved to <a href="http://socket.io/" rel="nofollow">socket.io</a> that has client and server implementation, but you must to mantain nodejs server and start to play with js.

I also have tested <a href="http://faye.jcoglan.com/" rel="nofollow">faye</a> in one project and works perfectly for Ruby enviroments.

But at the end, I think that the better solution is to use a library that you can embed in your server (java) and forget other tecnologies, I think that <a href="https://github.com/Atmosphere/atmosphere" rel="nofollow">Atmosphere</a> is a good solution with client and server also.

Currently I am working on a web app which uses Spring 3.1 and Hibernate 4.

As per the requirement, I want to implement push notifications like Facebook does, on a JSP page. If you have any suggestions, then please also list the compatible browsers with their versions.

Push notification for Java web app

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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目前，我正在开发一个使用Spring 3.1和Hibernate 4的web应用程序。根据要求，我想像Facebook一样，在JSP页面上实现推送通知。如果您有任何建议，请同时列出兼容的浏览器及其版本。

问Java web应用的推送通知
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