javaweb学习路之三--websocket多人在线聊天
在之前的项目基础上，加入了一个聊天室的功能，为了界面好看 引入了AmazeUI和umeditor最终效果图如下:
源码在 https://github.com/Zering/MyWeb 目前练习都在这个上面做
如果导入maven项目出现 Cannot change version of project facet Dynamic Web Module to 3.0.之类的错误时，可以参考http://www.cnblogs.com/zhanghj405/p/5579627.html
进入正题
jsp页面：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html lang="zh"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"> <title>We Chat</title> <!-- Set render engine for 360 browser --> <meta name="renderer" content="webkit"> <!-- No Baidu Siteapp--> <meta http-equiv="Cache-Control" content="no-siteapp" /> <link rel="alternate icon" href="../assets/i/favicon.ico"> <link rel="stylesheet" href="../assets/css/amazeui.min.css"> <link rel="stylesheet" href="../assets/css/app.css"> <!-- umeditor css --> <link href="../umeditor/themes/default/css/umeditor.css" rel="stylesheet"> <style> .title { text-align: center; } .chat-content-container { height: 29rem; overflow-y: scroll; border: 1px solid silver; } </style> </head> <body> <!-- title start --> <div class="title"> <div class="am-g am-g-fixed"> <div class="am-u-sm-12"> <h1 class="am-text-primary">We Chat</h1> </div> </div> </div> <!-- title end --> <!-- chat content start --> <div class="chat-content"> <div class="am-g am-g-fixed chat-content-container"> <div class="am-u-sm-12"> <ul id="message-list" class="am-comments-list am-comments-list-flip"></ul> </div> </div> </div> <!-- chat content start --> <!-- message input start --> <div class="message-input am-margin-top"> <div class="am-g am-g-fixed"> <div class="am-u-sm-12"> <form class="am-form"> <div class="am-form-group"> <script type="text/plain" id="myEditor" style="width: 100%; height: 8rem;"></script> </div> </form> </div> </div> <div class="am-g am-g-fixed am-margin-top"> <div class="am-u-sm-6"> <div id="message-input-nickname" class="am-input-group am-input-group-primary"> <span class="am-input-group-label"><i class="am-icon-user"></i></span> <input id="nickname" value="${username}" type="text" class="am-form-field" disabled /> </div> </div> <div class="am-u-sm-6"> <button id="send" type="button" class="am-btn am-btn-primary"> <i class="am-icon-send"></i> Send </button> </div> </div> </div> <!-- message input end --> <!--[if (gte IE 9)|!(IE)]><!--> <script src="../assets/js/jquery.min.js"></script> <!--<![endif]--> <!--[if lte IE 8 ]> <script src="http://libs.baidu.com/jquery/1.11.1/jquery.min.js"></script> <![endif]--> <!-- umeditor js --> <script charset="utf-8" src="../umeditor/umeditor.config.js"></script> <script charset="utf-8" src="../umeditor/umeditor.min.js"></script> <script src="../umeditor/lang/zh-cn/zh-cn.js"></script> <script> $(function() { // 初始化消息输入框 var um = UM.getEditor('myEditor'); // 使昵称框获取焦点 $('#nickname')[0].focus(); var socket = null; function parseObj(strData) {//转换对象 return (new Function("return " + strData))(); } ; //创建socket对象 socket = new WebSocket("ws://" + window.location.host + "/${pageContext.request.contextPath}/wechat"); //连接创建后调用 socket.onopen = function() { $("#message-list").append($('#nickname').val() + "进入聊天室<br/>"); }; //接收到服务器消息后调用 socket.onmessage = function(message) { var message = parseObj(message.data); var messageItem = '<li class="am-comment ' + (message.isSelf ? 'am-comment-flip' : 'am-comment') + '">' + '<a href="javascript:void(0)" ><img src="../assets/images/' + (message.isSelf ? 'self.png' : 'others.jpg') + '" alt="" class="am-comment-avatar" width="48" height="48"/></a>' + '<div class="am-comment-main"><header class="am-comment-hd"><div class="am-comment-meta">' + '<a href="javascript:void(0)" class="am-comment-author">' + message.nickname + '</a> <time>' + message.date + '</time></div></header>' + '<div class="am-comment-bd">' + message.content + '</div></div></li>'; $(messageItem).appendTo('#message-list'); // 把滚动条滚动到底部 $(".chat-content-container").scrollTop( $(".chat-content-container")[0].scrollHeight); }; //关闭连接的时候调用 socket.onclose = function() { $("#message-list").append($('#nickname').val() + "退出聊天室<br/>"); }; //出错时调用 socket.onerror = function() { alert("error"); }; $("#send").click(function() { var nickname = $('#nickname').val(); // 发送消息 socket.send(JSON.stringify({ content : um.getContent(), nickname : nickname })); // 清空消息输入框 um.setContent(''); // 消息输入框获取焦点 um.focus(); }); }); </script> </body> </html>
后台socket
package com.app.websocket; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Hashtable; import java.util.Map; import java.util.Set; import java.util.logging.Logger; import javax.websocket.CloseReason; import javax.websocket.OnClose; import javax.websocket.OnError; import javax.websocket.OnMessage; import javax.websocket.OnOpen; import javax.websocket.Session; import javax.websocket.server.ServerEndpoint; import com.alibaba.fastjson.JSON; import net.sf.json.JSONObject; //注意此访问地址格式如:"ws://"+ window.location.host+"/${pageContext.request.contextPath}/wechat"是ws开头的,而不是以http:开头的. @ServerEndpoint(value = "/wechat") public class Socket { private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm"); // 日期格式化 private Logger logger = Logger.getLogger(this.getClass().getName()); static Map<String,Session> sessionMap = new Hashtable<String,Session>(); @OnOpen public void onOpen(Session session) { sessionMap.put(session.getId(), session); } // @OnMessage // public void onMessage(String unscrambledWord, Session session) { // broadcastAll("message",unscrambledWord); // } @OnMessage public void getMessage(String message, Session session) { Set<Map.Entry<String,Session>> set = sessionMap.entrySet(); // 把客户端的消息解析为JSON对象 JSONObject jsonObject = JSONObject.fromObject(message); // 在消息中添加发送日期 jsonObject.put("date", DATE_FORMAT.format(new Date())); // // 把消息发送给所有连接的会话 // for (Session openSession : session.getOpenSessions()) { // // 添加本条消息是否为当前会话本身发的标志 // jsonObject.put("isSelf", openSession.equals(session)); // // 发送JSON格式的消息 // openSession.getAsyncRemote().sendText(jsonObject.toString()); // } for(Map.Entry<String,Session> i: set){ try { jsonObject.put("isSelf", i.getValue().equals(session)); i.getValue().getBasicRemote().sendText(JSON.toJSONString(jsonObject)); } catch (Exception e) { e.printStackTrace(); } } } // /** // * 广播给所有人 // * @param message // */ // public static void broadcastAll(String type,String message){ // Set<Map.Entry<String,Session>> set = sessionMap.entrySet(); // for(Map.Entry<String,Session> i: set){ // try { // i.getValue().getBasicRemote().sendText("{type:'"+type+"',text:'"+message+"'}"); // } catch (Exception e) { // e.printStackTrace(); // } // } // } @OnClose public void onClose(Session session, CloseReason closeReason) { sessionMap.remove(session.getId()); logger.info(String.format("Session %s closed because of %s", session.getId(), closeReason)); } @OnError public void error(Session session, java.lang.Throwable throwable){ sessionMap.remove(session.getId()); System.err.println("session "+session.getId()+" error:"+throwable); } }
@onmessage里面的改写是为了配合umeditor里面 可以发表情，图片，文件等一系列功能
