HTML5WebSocket实现点对点聊天

2017-01-13 10:52:25来源:csdn作者:qqHJQS人点击

昨天使用HTML5的websocket与Tomcat实现了多人聊天,那是最简单也是最基本的,其中注意的就是开发环境,要满足jdk1.7和tomcat8,当然了tom7 的7.063也行! 今天是国庆的最后一天,苦逼的加班,继续搞代码!令人欣慰的是,我用google找到了关于websocket的点对点聊天,更好的是可以和大多数系统很好的配合起来看下效果图 因为是模拟的,这里给出的是两个JSP页面A和B,里面分别向session里放了两个名字小明和小化,注意,这里的session是HttpSession session,之前多人聊天里的session是javax.websocket.Session;不一样的。 这里想一下, 使用HttpSession session控制聊天的用户,好处怎样,自己猜~~~ 这里没有使用注解,传统的web.xml配置方式,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MessageInboundMessageInbound 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>正在登录</span>
<br>
登录人:
<span></span>
<br>
<br>
<br>发送给谁:<input type="text" value="小明"></input>
<br>
发送内容:<input type="text"></input>
<br>
聊天框:<div></div>
<br>
<input type="button" value="send" onclick="sendMsg()"></input>
</body>
</html>

这是A.jsp页面,B同上 通过以上代码,就可以实现一个点对点的聊天功能,如果做的大,可以做成一个web版的聊天系统,包括聊天室和单人聊天,都说websocket不支持二进制的传输,但是看到个大流说了这样的话

不过现在做下来 感觉使用二进制的意义不是很大。很久以前就一直困混,怎么都说JS不支持二进制,发现其实只是一堆坑货对这个没研究。。(用的是filereader)

能否成功,待我以后验证,今天就到这里,附上代码 jsp有点小错误,难不倒各位的!有用的话,点个赞,嘿嘿!!!


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