使用JavaWeb webSocket實(shí)現(xiàn)簡(jiǎn)易的點(diǎn)對(duì)點(diǎn)聊天功能實(shí)例代碼
首先給大家聲明一點(diǎn):需要 jdk 7 , tomcat需要支持websocket的版本
1.InitServlet
該類主要是用來初始化構(gòu)造將來存儲(chǔ)用戶身份信息的map倉庫,利用其初始化方法Init 初始化倉庫, 利用其靜態(tài)方法getSocketList 獲得對(duì)應(yīng)的用戶身份信息。
webSocket ,我認(rèn)為MessageInbound 用來識(shí)別登錄人的信息,用它來找到對(duì)應(yīng)的人,推送消息。每次登錄都會(huì)產(chǎn)生一個(gè)MessageInbound。
這里的 HashMap<String,MessageInbound> :string 存儲(chǔ)用戶session的登錄id,MessageInbound存儲(chǔ) 推送需要的身份信息。以上屬于個(gè)人口頭話理解。
package socket; import java.nio.CharBuffer; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import org.apache.catalina.websocket.MessageInbound; public class InitServlet extends HttpServlet { private static final long serialVersionUID = -L; //private static List<MessageInbound> socketList; private static HashMap<String,MessageInbound> socketList; public void init(ServletConfig config) throws ServletException { // InitServlet.socketList = new ArrayList<MessageInbound>(); InitServlet.socketList = new HashMap<String,MessageInbound>(); super.init(config); System.out.println("Server start============"); } public static HashMap<String,MessageInbound> getSocketList() { return InitServlet.socketList; } /* public static List<MessageInbound> getSocketList() { return InitServlet.socketList; } */}
2.MyWebSocketServlet
websocket用來建立連接的servlet,建立連接時(shí),首先在session獲取該登錄人的userId,在調(diào)用MyMessageInbound構(gòu)造函數(shù)傳入userId
package socket; import java.io.IOException; import java.io.PrintWriter; import java.nio.CharBuffer; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.catalina.websocket.StreamInbound; import org.apache.catalina.websocket.WebSocketServlet; /** * * @ClassName: MyWebSocketServlet * @Description: 建立連接時(shí)創(chuàng)立 * @author mangues * @date -- */ public class MyWebSocketServlet extends WebSocketServlet { public String getUser(HttpServletRequest request){ String userName = (String) request.getSession().getAttribute("user"); if(userName==null){ return null; } return userName; // return (String) request.getAttribute("user"); } @Override protected StreamInbound createWebSocketInbound(String arg, HttpServletRequest request) { System.out.println("##########"); return new MyMessageInbound(this.getUser(request)); } }
3.onOpen方法調(diào)用InitServlet的map身份倉庫,
放入用戶userId 和 對(duì)應(yīng)該登錄用戶的websocket身份信息MessageInbound (可以用userId來尋找到推送需要的 身份MessageInbound )
onTextMessage :用來獲取消息,并發(fā)送消息
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 arg) throws IOException { // TODO Auto-generated method stub } @Override protected void onTextMessage(CharBuffer msg) throws IOException { //用戶所發(fā)消息處理后的map HashMap<String,String> messageMap = MessageUtil.getMessage(msg); //處理消息類 //上線用戶集合類map HashMap<String, MessageInbound> userMsgMap = InitServlet.getSocketList(); String fromName = messageMap.get("fromName"); //消息來自人 的userId String toName = messageMap.get("toName"); //消息發(fā)往人的 userId //獲取該用戶 MessageInbound messageInbound = userMsgMap.get(toName); //在倉庫中取出發(fā)往人的MessageInbound if(messageInbound!=null){ //如果發(fā)往人 存在進(jìn)行操作 WsOutbound outbound = messageInbound.getWsOutbound(); String content = messageMap.get("content"); //獲取消息內(nèi)容 String msgContentString = fromName + " " + content; //構(gòu)造發(fā)送的消息 //發(fā)出去內(nèi)容 CharBuffer toMsg = CharBuffer.wrap(msgContentString.toCharArray()); outbound.writeTextMessage(toMsg); // outbound.flush(); } /* for (MessageInbound messageInbound : InitServlet.getSocketList()) { CharBuffer buffer = CharBuffer.wrap(msg); WsOutbound outbound = messageInbound.getWsOutbound(); outbound.writeTextMessage(buffer); outbound.flush(); } */ } @Override protected void onClose(int status) { InitServlet.getSocketList().remove(this); super.onClose(status); } @Override protected void onOpen(WsOutbound outbound) { super.onOpen(outbound); //登錄的用戶注冊(cè)進(jìn)去 if(name!=null){ InitServlet.getSocketList().put(name, this); } // InitServlet.getSocketList().add(this); } }
4.消息處理類,處理前端發(fā)來的消息
package util; import java.nio.CharBuffer; import java.util.HashMap; /** * * @ClassName: MessageUtil * @Description: 消息處理類 * @author mangues * @date -- */ 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[]); map.put("toName", m[]); map.put("content", m[]); return map; } }
5.web配置
<?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>mywebsocket</servlet-name> <servlet-class>socket.MyWebSocketServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>mywebsocket</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> </servlet> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
6,前端,為方便起見,我直接用了兩個(gè)jsp,在其中用<%session.setAttribute("user","小明")%>;來表示登錄。
兩個(gè)jsp沒任何本質(zhì)差別,只是用來表示兩個(gè)不同的人登錄,可以同兩個(gè)瀏覽器打開不同的jsp,來聊天操作
A.小化
<%@ page language="java" contentType="text/html; charset=UTF-" pageEncoding="UTF-"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-"> <title>Index</title> <script type="text/javascript" src="js/jquery ...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:/webSocket/mywebsocket.do"); else if ('MozWebSocket' in window) ws = new MozWebSocket("ws://localhost:/webSocket/mywebsocket.do"); else alert("not support"); ws.onmessage = function(evt) { //alert(evt.data); console.log(evt); $("#xiaoxi").val(evt.data); }; ws.onclose = function(evt) { //alert("close"); document.getElementById('denglu').innerHTML="離線"; }; ws.onopen = function(evt) { //alert("open"); document.getElementById('denglu').innerHTML="在線"; document.getElementById('userName').innerHTML='小化'; }; } function sendMsg() { var fromName = "小化"; var toName = document.getElementById('name').value; //發(fā)給誰 var content = document.getElementById('writeMsg').value; //發(fā)送內(nèi)容 ws.send(fromName+","+toName+","+content); } </script> </head> <body onload="startWebSocket();"> <p>聊天功能實(shí)現(xiàn)</p> 登錄狀態(tài): <span id="denglu" style="color:red;">正在登錄</span> <br> 登錄人: <span id="userName"></span> <br> <br> <br> 發(fā)送給誰:<input type="text" id="name" value="小明"></input> <br> 發(fā)送內(nèi)容:<input type="text" id="writeMsg"></input> <br> 聊天框:<textarea rows="" cols="" readonly id="xiaoxi"></textarea> <br> <input type="button" value="send" onclick="sendMsg()"></input> </body> </html>
B.小明
<%@ 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 2.1.1.min.js"></script> <%session.setAttribute("user", "小明");%> <script type="text/javascript"> var ws = null; function startWebSocket() { if ('WebSocket' in window) ws = new WebSocket("ws://localhost:8080/webSocket/mywebsocket.do"); else if ('MozWebSocket' in window) ws = new MozWebSocket("ws://localhost:8080/webSocket/mywebsocket.do"); else alert("not support"); ws.onmessage = function(evt) { console.log(evt); //alert(evt.data); $("#xiaoxi").val(evt.data); }; ws.onclose = function(evt) { //alert("close"); document.getElementById('denglu').innerHTML="離線"; }; ws.onopen = function(evt) { //alert("open"); document.getElementById('denglu').innerHTML="在線"; document.getElementById('userName').innerHTML="小明"; }; } function sendMsg() { var fromName = "小明"; var toName = document.getElementById('name').value; //發(fā)給誰 var content = document.getElementById('writeMsg').value; //發(fā)送內(nèi)容 ws.send(fromName+","+toName+","+content); } </script> </head> <body onload="startWebSocket();"> <p>聊天功能實(shí)現(xiàn)</p> 登錄狀態(tài): <span id="denglu" style="color:red;">正在登錄</span> <br> 登錄人: <span id="userName"></span> <br> <br> <br> 發(fā)送給誰:<input type="text" id="name" value="小化"></input> <br> 發(fā)送內(nèi)容:<input type="text" id="writeMsg"></input> <br> 聊天框:<textarea rows="13" cols="100" readonly id="xiaoxi"></textarea> <br> <input type="button" value="send" onclick="sendMsg()"></input> </body> </html>
以上所述是小編給大家介紹的使用JavaWeb webSocket實(shí)現(xiàn)簡(jiǎn)易的點(diǎn)對(duì)點(diǎn)聊天功能實(shí)例代碼的相關(guān)知識(shí),希望對(duì)大家有所幫助,如果大家有任何疑問請(qǐng)給我留言,小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持!
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