websocket 是html5新规范，现在主流浏览器（ie 10+）均支持。最近用了一下，总结下。
总体思路使用spring mvc做路由。dispatchservlet是支持 http与websocket协议的。只是在处理上用的handle不同。
client：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>WebSoket Demo</title>
<script type="text/javascript">
//验证浏览器是否支持WebSocket协议
if (!window.WebSocket) {
alert("WebSocket not supported by this browser!");
}
var ws;
function display() {
//var valueLabel = document.getElementById("valueLabel");
//valueLabel.innerHTML = "";
ws = new WebSocket("ws://" + document.location.host + "/myHandler.do");
//监听消息
ws.onmessage = function(event) {
log(event.data);
};
// 打开WebSocket
ws.onclose = function(event) {
//WebSocket Status:: Socket Closed
};
// 打开WebSocket
ws.onopen = function(event) {
//WebSocket Status:: Socket Open
//// 发送一个初始化消息
ws.send("Hello, Server!");
};
ws.onerror = function(event) {
//WebSocket Status:: Error was reported
};
}
var log = function(s) {
if (document.readyState !== "complete") {
log.buffer.push(s);
} else {
document.getElementById("contentId").innerHTML += (s + "\n");
}
}
function sendMsg() {
var msg = document.getElementById("messageId");
//alert(msg.value);
ws.send(msg.value);
}
</script>
</head>
<body οnlοad="display();">
<div id="valueLabel"></div>
<textarea rows="20" cols="30" id="contentId"></textarea>
<br />
<input name="message" id="messageId" />
<button id="sendButton" onClick="javascript:sendMsg()">Send</button>
</body>
</html>
server ：
用于处理收到的websocket消息，
TextWebSocketHandler只处理文本消息package nms.client.web;
import java.io.IOException;
import nms.server.alarm.status.AlarmRefreshStatus;
import nms.server.common.JsonHelper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
public class MyHandler extends TextWebSocketHandler {
/**
* Logger for this class
*/
private static final Log LOGGER = LogFactory.getLog(MyHandler.class);
@Override
public void handleTextMessage(WebSocketSession session, TextMessage message) throws IOException {
//简单返回收到的消息
session.sendMessage(message);
}
}配置路由，注册handle类。是否加.do看dispatchserverlet类拦截的消息名称后缀，如果有就加。我的是拦截.do。
package nms.client.web;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
@Configuration
@EnableWebMvc
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {
@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(myHandler(), "/myHandler.do");
}
@Bean
public WebSocketHandler myHandler() {
return new MyHandler();
}
}运行是这样子的：
