扣丁学堂HTML5培训简述HTML5 WebSocket如何实现点对点聊天

2019-09-12 09:49:22 2937浏览

马上就是中秋团圆节了，不知道有多少程序员小伙伴要在中秋加班敲代码呢?需要加班的小伙伴也不要太伤心，本篇文章扣丁学堂HTML5培训小编给大家分享一下HTML5 WebSocket实现点对点聊天的示例代码的相关资料来增强一下小伙伴的技术水平，争取下一年的中秋不再加班，下面就随小编来了解一下吧。

首先在系统启动的时候调用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;    
    }    
}

这里你可以跟自己的系统结合，对应的web配置代码如下：

<?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>

这就是最普通的前台像后台发送请求的过程，也是很容易嵌入到自己的系统里.

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继承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中处理前台发出的信息，并封装信息传给目标.

还有一个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;
    }
}

当然了，前台也要按照规定的格式传信息

<%@ 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：<div id="message" style="height: 250px;width: 280px;border: 1px solid; overflow: auto;"></div>
<br>
<input type="button" value="send" onclick="sendMsg()"></input>
</body>
</html>

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