本文主要包含WebSocket,HTML5,web等相关知识,匿名希望在学习及工作中可以帮助到您
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！
本文主要和大家介绍HTML5 WebSocket实现点对点聊天的示例代码的相关资料,小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧，希望能帮助到大家。
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(ev