HTML5 服务器发送事件（server-sent event）允许网页获得来自服务器的更新；
举个例子，如下，其中服务器端使用Java的Struts 2框架，会向浏览器发送服务器最新的时间数据：
服务端代码：
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pubpc class SSE extends ActionSupport {
private InputStream sseStream;
pubpc InputStream getSseStream() {
return sseStream;
}
pubpc String handleSSE() {
System.out.println("Inside handleSSE() ");
String result = "data: "+new Date().toString() + "nn";
sseStream = new ByteArrayInputStream(result.getBytes() );
System.out.println("Exiting handleSSE() ");
return SUCCESS;
}
}
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<action name="handleSSE" class="pichen.java.html5.test.SSE" method="handleSSE">
<result name="success" type="stream">
<param name="contentType">text/event-stream</param>
<param name="inputName">sseStream</param>
</result>
</action>
客户端代码：
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<p><output id="result">OUTPUT VALUE</output></p>
<script>
(function(global, window, document) {
‘use strict’;
function main() {
window.addEventpstener(‘DOMContentLoaded’, contentLoaded);
}
function contentLoaded() {
var result = document.getElementById(‘result’);
