昨天使用HTML5的websocket與Tomcat實現了多人聊天,那是最簡單也是最基本的,其中註意的就是開發環境,要滿足jdk1.7和tomcat8,當然了tom7 的7.063也行!
本文主要和大家介紹HTML5 WebSocket實現點對點聊天的範例程式碼的相關資料,小編覺得挺不錯的,現在分享給大家,也給大家做個參考。一起跟著小編過來看看吧,希望能幫助大家。
因為是模擬的,這裡給的是兩個JSP頁面A和B,裡面分別向session裡放了兩個名字小明和小化,注意,這裡的session是HttpSession session,之前多人聊天裡的session是javax.websocket.Session;不一樣的。
這裡想一下, 使用HttpSession session控制聊天的用戶,好處怎樣,自己猜~~~
這裡沒有使用註解,傳統的web.xml配置方式,首先在系統啟動的時候呼叫InitServlet方法
public class InitServlet extends HttpServlet { private static final long serialVersionUID = -3163557381361759907L; private static HashMap<String,MessageInbound> socketList; public void init(ServletConfig config) throws ServletException { InitServlet.socketList = new HashMap<String,MessageInbound>(); super.init(config); System.out.println("初始化聊天容器"); } public static HashMap<String,MessageInbound> getSocketList() { return InitServlet.socketList; } }
這裡你可以跟自己的系統結合,對應的web設定碼如下:
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <servlet> <servlet-name>websocket</servlet-name> <servlet-class>socket.MyWebSocketServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>websocket</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <servlet> <servlet-name>initServlet</servlet-name> <servlet-class>socket.InitServlet</servlet-class> <load-on-startup>1</load-on-startup><!--方法执行的级别--> </servlet> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
這就是最普通的前台像後台發送請求的過程,也是很容易嵌入到自己的系統裡
MyWebSocketServlet:
public class MyWebSocketServlet extends WebSocketServlet { public String getUser(HttpServletRequest request){ String userName = (String) request.getSession().getAttribute("user"); if(userName==null){ return null; } return userName; } protected StreamInbound createWebSocketInbound(String arg0, HttpServletRequest request) { System.out.println("用户" + request.getSession().getAttribute("user") + "登录"); return new MyMessageInbound(this.getUser(request)); } }
#MyMessageInbound繼承MessageInbound
package socket; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.util.HashMap; import org.apache.catalina.websocket.MessageInbound; import org.apache.catalina.websocket.WsOutbound; import util.MessageUtil; public class MyMessageInbound extends MessageInbound { private String name; public MyMessageInbound() { super(); } public MyMessageInbound(String name) { super(); this.name = name; } @Override protected void onBinaryMessage(ByteBuffer arg0) throws IOException { } @Override protected void onTextMessage(CharBuffer msg) throws IOException { //用户所发消息处理后的map HashMap<String,String> messageMap = MessageUtil.getMessage(msg); //处理消息类 //上线用户集合类map HashMap<String, MessageInbound> userMsgMap = InitServlet.getSocketList(); String fromName = messageMap.get("fromName"); //消息来自人 的userId String toName = messageMap.get("toName"); //消息发往人的 userId //获取该用户 MessageInbound messageInbound = userMsgMap.get(toName); //在仓库中取出发往人的MessageInbound MessageInbound messageFromInbound = userMsgMap.get(fromName); if(messageInbound!=null && messageFromInbound!=null){ //如果发往人 存在进行操作 WsOutbound outbound = messageInbound.getWsOutbound(); WsOutbound outFromBound = messageFromInbound.getWsOutbound(); String content = messageMap.get("content"); //获取消息内容 String msgContentString = fromName + "说: " + content; //构造发送的消息 //发出去内容 CharBuffer toMsg = CharBuffer.wrap(msgContentString.toCharArray()); CharBuffer fromMsg = CharBuffer.wrap(msgContentString.toCharArray()); outFromBound.writeTextMessage(fromMsg); outbound.writeTextMessage(toMsg); // outFromBound.flush(); outbound.flush(); } } @Override protected void onClose(int status) { InitServlet.getSocketList().remove(this); super.onClose(status); } @Override protected void onOpen(WsOutbound outbound) { super.onOpen(outbound); //登录的用户注册进去 if(name!=null){ InitServlet.getSocketList().put(name, this);//存放客服ID与用户 } } @Override public int getReadTimeout() { return 0; } }
在onTextMessage中處理前台發出的訊息,並封裝訊息傳給目標
還有一個messageutil
package util; import java.nio.CharBuffer; import java.util.HashMap; public class MessageUtil { public static HashMap<String,String> getMessage(CharBuffer msg) { HashMap<String,String> map = new HashMap<String,String>(); String msgString = msg.toString(); String m[] = msgString.split(","); map.put("fromName", m[0]); map.put("toName", m[1]); map.put("content", m[2]); return map; } }
當然了,前台也要按照規定的格式傳資訊
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Index</title> <script type="text/javascript" src="js/jquery-1.7.2.min.js"></script> <%session.setAttribute("user", "小化");%> <script type="text/javascript"> var ws = null; function startWebSocket() { if ('WebSocket' in window) ws = new WebSocket("ws://localhost:8080/WebSocketUser/websocket.do"); else if ('MozWebSocket' in window) ws = new MozWebSocket("ws://localhost:8080/WebSocketUser/websocket.do"); else alert("not support"); ws.onmessage = function(evt) { //alert(evt.data); console.log(evt); // $("#xiaoxi").val(evt.data); setMessageInnerHTML(evt.data); }; function setMessageInnerHTML(innerHTML){ document.getElementById('message').innerHTML += innerHTML + '<br/>'; } ws.onclose = function(evt) { //alert("close"); document.getElementById('denglu').innerHTML="离线"; }; ws.onopen = function(evt) { //alert("open"); document.getElementById('denglu').innerHTML="在线"; document.getElementById('userName').innerHTML='小化'; }; } function sendMsg() { var fromName = "小化"; var toName = document.getElementById('name').value; //发给谁 var content = document.getElementById('writeMsg').value; //发送内容 ws.send(fromName+","+toName+","+content);//注意格式 } </script> </head> <body onload="startWebSocket();"> <p>聊天功能实现</p> 登录状态: <span id="denglu" style="color:red;">正在登录</span> <br> 登录人: <span id="userName"></span> <br> <br> <br> 发送给谁:<input type="text" id="name" value="小明"></input> <br> 发送内容:<input type="text" id="writeMsg"></input> <br> 聊天框:<p id="message" style="height: 250px;width: 280px;border: 1px solid; overflow: auto;"></p> <br> <input type="button" value="send" onclick="sendMsg()"></input> </body> </html>
這是A.jsp頁面,B同上
透過以上程式碼,就可以實現一個點對點的聊天功能,如果做的大,可以做成一個web版的聊天系統,包括聊天室和單人聊天,都說websocket不支援二進位的傳輸,但是看到個大流說了這樣的話
不過現在做下來感覺使用二進位的意義不是很大。很久以前就一直困混,怎麼都說JS不支援二進制,發現其實只是一堆坑貨對這個沒研究。 。 (用的是filereader)
相關推薦:
以上是HTML5 WebSocket點對點聊天實作方法的詳細內容。更多資訊請關注PHP中文網其他相關文章!