websocket結合多線程實現請求一次，輪詢推送數據

maven導入依賴

<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-websocket</artifactId>
			<version>4.3.12.RELEASE</version>
		</dependency>

java實現類

package com.tradeplatform.trade.order.websocket;
import java.io.IOException;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.socket.server.standard.SpringConfigurator;

import com.alibaba.fastjson.JSONObject;
import com.tradeplatform.common.utils.LoggerUtils;
import com.tradeplatform.trade.order.service.TradeKlineService;

/**
 * @ServerEndpoint 註解是一個類層次的註解，它的功能主要是將目前的類定義成一個websocket服務器端,
 * 註解的值將被用於監聽用戶連接的終端訪問URL地址,客戶端可以通過這個URL來連接到WebSocket服務器端
 */
@ServerEndpoint(value = "/webSocket/KlineWebSocket",configurator = SpringConfigurator.class)
public class KlineWebSocket {
    private static LoggerUtils logger = LoggerUtils.getLogger(KlineWebSocket.class);
    //創建一個線程
    // private KThread thread;
    //用來存放每個客戶端對應的MyWebSocket對象。
    private static CopyOnWriteArraySet<KlineWebSocket> webSocketSet = new CopyOnWriteArraySet<KlineWebSocket>();
    //與某個客戶端的連接會話，需要通過它來給客戶端發送數據
    private Session session;
    @Autowired
	private TradeKlineService tradeKlineService;
    //定義參數
    private JSONObject params = new JSONObject();
    private boolean start = false;
    private long sleep = 1000;
    private  Thread th;
    
    
    private String symbol;
    private long marketId;
    private String resolution;
    /**
     * 連接建立成功調用的方法
     * @param session 可選的參數。session爲與某個客戶端的連接會話，需要通過它來給客戶端發送數據
     */
    @OnOpen
    public void onOpen(Session session) {
        webSocketSet.add(this);
        th = new Thread(new thread());
        th.start();
    }
    
    @OnMessage
    public void onMessage(String message, Session session) { 
        System.out.println("來自客戶端的消息:" + message);
        this.session = session;
        
        try {
        	 params = (JSONObject) JSONObject.parse(message);
             if(params.getBoolean("start")!=null) {
             	start = params.getBoolean("start"); 
             }
             if(params.getLong("sleep")!=null) {
             	sleep = params.getLong("sleep");
             }
             
             Object o = null;
             String req = params.getString("req");
             if(req.equals("config")) {
            	 o = config(); 
            	 this.session.getAsyncRemote().sendText(o.toString()); 
             }
		} catch (Exception e) {
			
		}
       
    }
    
    class thread extends Thread{
        @Override
        public void run() {
        	while(true){
                try {
                	if(start) {
                		sendMessage(session);
                	}
                	Thread.sleep(sleep); 
				} catch (Exception e) {
					e.printStackTrace();
				}
            }
        }
    }

    /**
                 * 連接關閉調用的方法
     */
    @SuppressWarnings("deprecation")
	@OnClose
    public void onClose() {
    	if (th!=null&&th.isAlive()) {
			th.stop();
		}
    	webSocketSet.remove(this);
    }
   
    public void sendMessage(Session session) throws IOException { 
    	
         Object o = history(symbol,marketId,resolution);
    	 this.session.getAsyncRemote().sendText(o.toString()); 
        
    }  
    
    /**
                  * 發生錯誤時調用
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
    	if (th!=null&&th.isAlive()) {
			th.stop();
		}
    }
    
    public Object config() {
        Object jsonObject = "{\"supports_search\":true,\"supports_group_request\":false,\"supports_marks\":true,\"supports_timescale_marks\":true,\"supports_time\":true,\"exchanges\":[{\"value\":\"\",\"name\":\"All Exchanges\",\"desc\":\"\"},{\"value\":\"NasdaqNM\",\"name\":\"NasdaqNM\",\"desc\":\"NasdaqNM\"},{\"value\":\"NYSE\",\"name\":\"NYSE\",\"desc\":\"NYSE\"},{\"value\":\"NCM\",\"name\":\"NCM\",\"desc\":\"NCM\"},{\"value\":\"NGM\",\"name\":\"NGM\",\"desc\":\"NGM\"}],\"symbols_types\":[{\"name\":\"All types\",\"value\":\"\"},{\"name\":\"Stock\",\"value\":\"stock\"},{\"name\":\"Index\",\"value\":\"index\"}],\"supported_resolutions\":[\"1\",\"5\",\"15\",\"30\",\"60\",\"240\",\"360\",\"720\",\"1440\"]}";
        return jsonObject;
    }
    public Object history(String symbol,long marketId, String resolution) {
        Object o = tradeKlineService.getTvLine(marketId,resolution); 
        return o;
    }
}

jsp頁面調用

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>
    <title>My WebSocket</title>
</head> 
<body>
Welcome<br/>
<input id="text" type="text" /><button onclick="send()">Send</button>    <button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>

<script type="text/javascript">
    var websocket = null;

    //判斷當前瀏覽器是否支持WebSocket  ,主要此處要更換爲自己的地址
    if('WebSocket' in window){
        websocket = new WebSocket("ws://127.0.0.1:8007/trade/webSocket/KlineWebSocket"); 
    } 
    else{  
        alert('Not support websocket')   
    }

    //連接發生錯誤的回調方法
    websocket.onerror = function(){
        setMessageInnerHTML("error");
    };   

    //連接成功建立的回調方法
    websocket.onopen = function(event){
        setMessageInnerHTML("open");
    }

    //接收到消息的回調方法
    websocket.onmessage = function(event){
        setMessageInnerHTML(event.data);
    }

    //連接關閉的回調方法
    websocket.onclose = function(){
        setMessageInnerHTML("close");
    }

    //監聽窗口關閉事件，當窗口關閉時，主動去關閉websocket連接，防止連接還沒斷開就關閉窗口，server端會拋異常。
    window.onbeforeunload = function(){
        websocket.close();
    }

    //將消息顯示在網頁上
    function setMessageInnerHTML(innerHTML){
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //關閉連接
    function closeWebSocket(){
        websocket.close();
    }

    //發送消息
    function send(){
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>