Web Socket 多個使用者之間實現時時訊息推送
阿新 • • 發佈:2019-01-01
1個月不寫部落格了,最近挺忙的,剛用了2天寫了個預約的小程式和大家分享下~
首先大家看下介面:
1.祕書端 - 專門新增預約的內容,新增以後立馬在 “市長端” 彈出有一個新的預約
2.市長端 - 專門看最新的預約 ,看看要不要接待,接待或不接待點選按鈕以後以後立馬 回覆祕書
其實挺簡單的一個需求啊,但是其中用到的東西還真是挺多的
1.socket server端 和 web socket client端 中的訊息時時分發到各個 client端
2. ajax json 資料查詢和UI渲染包括一些css的動畫
setp1. 我先按照web的做法把ui和各個頁面的效果做出來
setp2. 完善好所有不是實時同步的業務流程
setp3. 根據websocket 分發的資料,挑選是自己的,audio提示:您有一個新的訊息,然後呼叫ajax重新整理資料來實現實時同步
setp4. 新增完或者接待完 使用send (admin_id,to_admin_id) 方法推送給某個人,然後某個人的ui進行重新ajax渲染
部分程式碼:
web socket client 端 api.jsp 把所用同步的回撥方法和上線,下線,傳送,播放聲音都放在一個jsp中 需要的頁面直接:iframe引入
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ include file="/config.jsp"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>web socket api</title> <base href="<%=$.root() %>" /> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> </head> <body> <audio id="audio" preload="auto" controls="controls" height="100" width="100"> <source src="qiyulin/song.ogg" type="audio/ogg" /> <source src="qiyulin/song.mp3" type="audio/mp3" /> <embed height="100" width="100" src="qiyulin/song.mp3" /> </audio> <script type="text/javascript"> var tcp_url='<%=tcp_url %>'; </script> <script type="text/javascript" src="qiyulin/prototype.js"></script> <script type="text/javascript"> var ws =null; //play var play = function(){ var audio = document.getElementById('audio'); audio.play(); } //offline var offline = function(){ log("[WebSocket#close]\n"); if (ws!=null) { ws.close(); ws = null; } } //online var online = function(){ if(ws==null){ ws = new WebSocket(tcp_url); ws.onopen = function() { log("[WebSocket#onopen]\n"); window.parent.online(); } ws.onmessage = function(e) { log("[WebSocket#onmessage] Message: '" + e.data + "'\n"); window.parent.message(e.data); } ws.onclose = function() { log("[WebSocket#onclose]\n"); if (ws) { ws.close(); ws = null; } window.parent.offline(); } } } //send var send = function(admin_id,to_admin_id){ if(ws!=null){ var json ='{"admin_id":'+admin_id+',"to_admin_id":'+to_admin_id+'}'; ws.send(json); }else{ online(); var json ='{"admin_id":'+admin_id+',"to_admin_id":'+to_admin_id+'}'; ws.send(json); } } function log(text) { var str=(new Date).getTime() + ": " + (!Object.isUndefined(text) && text !== null ? text.escapeHTML() : "null") ; console.log(str); } document.observe("dom:loaded", function() { if (!window.WebSocket) { alert("不支援WebSocket!"); return; } online(); }); </script> </body> </html>
socket server端 因為是web的,所以在web.xml中配置 一個ContextListener
public class TcpServerListener implements ServletContextListener{ private TcpServer s; public void contextInitialized(ServletContextEvent arg0) { int port = 8887; try { s = new TcpServer( port ); s.start(); System.out.println( "TCPSERVER START ON PORT: " + s.getPort() ); } catch (UnknownHostException e) { e.printStackTrace(); } } public void contextDestroyed(ServletContextEvent arg0) { try { s.stop(); } catch (Exception e) { e.printStackTrace(); } } }
請求json資料 java action 端
public void visitorjson(){
String page = $.get("p");
if($.empty(page)) page ="1";
Map admin = (Map)$.session("admin");
int s = $.time($.date());
int e = s+24*60*60;
String where=" and start_time>"+s+" and start_time<"+e;
String start="select *";
String cstart="select count(*) c";
String sql=" from record where status=1 and admin_id="+admin.get("id")+" "+where;
String limit =" order by start_time desc ";
List<Map> list = new ArrayList<Map>();
StringBuilder count = new StringBuilder("0");
$.dbcp().query(start+sql+limit,list).count(cstart+sql,count).close();
$.json("status",1).json("list",list).json("count",count).out();
}
查詢list 和 共多少條 ,然後返回json。是不是很優雅~~$.dbcp().query(sql1,list).count(sql2,count).close();
$.json("status",1).json("list",list).json("count",count).out();