接着上一篇的锅，我们使用Spring+WebSocket+SocketJs方案，兼容处理低版本浏览器不兼容websocket协议的问题；

1.web客户端页面展示推送信息其消息处理页面msg.jsp需引用socket客户端js,引用路径如下:

<%--引用的socket客户端处理封装--%>
<script src="<%=path%>/static/index/socket.js"></script>
<%--引用的socket客户端js--%>
<script src="<%=path%>/static/common/js/sockjs-client_1.1.1_sockjs.min.js"></script>
<%--H5的前端session缓存兼容ie的处理方法--%>
<script src="<%=path%>/static/common/utils/sessionStorage.js"></script>

其中, sockjs-client_1.1.1_sockjs.min.js可以去网站下载;sessionStorage.js主要内容如下:

/**
 *补充不支持sessionStorage的浏览器使用cookie代替
 * 
 * */
if (!window.sessionStorage) {
    // noinspection JSAnnotator
    window.sessionStorage = {
        getItem: function (sKey) {
            if (!sKey || !this.hasOwnProperty(sKey)) {
                return null;
            }
            return unescape(document.cookie.replace(new RegExp("(?:^|.*;\\s*)" + escape(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=\\s*((?:[^;](?!;))*[^;]?).*"), "$1"));
        },
        key: function (nKeyId) {
            return unescape(document.cookie.replace(/\s*\=(?:.(?!;))*$/, "").split(/\s*\=(?:[^;](?!;))*[^;]?;\s*/)[nKeyId]);
        },
        setItem: function (sKey, sValue) {
            if (!sKey) {
                return;
            }
            document.cookie = escape(sKey) + "=" + escape(sValue) + "; path=/";
            this.length = document.cookie.match(/\=/g).length;
        },
        length: 0,
        removeItem: function (sKey) {
            if (!sKey) {
                return;
            } else if (!this.hasOwnProperty(sKey)) {
                return;
            }
            document.cookie = escape(sKey) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
            this.length--;
        },
        hasOwnProperty: function (sKey) {
            return (new RegExp("(?:^|;\\s*)" + escape(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=")).test(document.cookie);
        }
    };
    window.sessionStorage.length = (document.cookie.match(/\=/g) || window.sessionStorage).length;
}

 其中,socket.js的主要内容如下:

var ip = window.location.host;
var url = new StringBuffer();
url.append(ip).append(path);
var param = new StringBuffer();
param.append("?userName=").append(userName);
param.append("&loginUserId=").append(loginUserId);
$(function(){
	var socket = null;
	var target = "ws://"+url+"/webSocketServer"+param;
    //权限控制webSocket登录
	if(isLogin == "true"){
		if('WebSocket' in window) {
	   		 socket = new WebSocket(target);
		 } else if ('MozWebSocket' in window) {
	    	socket = new MozWebSocket(target);
		 } else {
              //兼容低版本浏览器而模拟的socket请求
	    	  socket = new SockJS("http://"+url+"/sockjs/webSocketServer"+param);
	     }
		socketEvent();
		
	}

    //socketJs的事件与webSocket一致,都支持方法和监听
	function socketEvent(){

		socket.onopen = function(event) {...};
        //获取服务端消息
		socket.onmessage = function(event) {

            var msg=JSON.parse(event.data);
            var type=1;
            if(msg.messageType===0){