昨天使用HTML5的websocket與Tomcat實現(xiàn)了多人聊天,那是最簡單也是最基本的,其中注意的就是開發(fā)環(huán)境,要滿足jdk1.7和tomcat8,當(dāng)然了tom7 的7.063也行!
今天是國慶的最后一天,苦逼的加班,繼續(xù)搞代碼!令人欣慰的是,我用google找到了關(guān)于websocket的點對點聊天,更好的是可以和大多數(shù)系統(tǒng)很好的配合起來看下效果圖
因為是模擬的,這里給出的是兩個JSP頁面A和B,里面分別向session里放了兩個名字小明和小化,注意,這里的session是HttpSession session,之前多人聊天里的session是javax.websocket.Session;不一樣的。
這里想一下, 使用HttpSession session控制聊天的用戶,好處怎樣,自己猜~~~
這里沒有使用注解,傳統(tǒng)的web.xml配置方式,首先在系統(tǒng)啟動的時候調(diào)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;
}
}
這里你可以跟自己的系統(tǒng)結(jié)合,對應(yīng)的web配置代碼如下:
<?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><!--方法執(zhí)行的級別-->
</servlet>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
這就是最普通的前臺像后臺發(fā)送請求的過程,也是很容易嵌入到自己的系統(tǒng)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("用戶" + request.getSession().getAttribute("user") + "登錄");
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
MessageInbound messageFromInbound = userMsgMap.get(fromName);
if(messageInbound!=null && messageFromInbound!=null){ //如果發(fā)往人 存在進行操作
WsOutbound outbound = messageInbound.getWsOutbound();
WsOutbound outFromBound = messageFromInbound.getWsOutbound();
String content = messageMap.get("content"); //獲取消息內(nèi)容
String msgContentString = fromName + "說: " + content; //構(gòu)造發(fā)送的消息
//發(fā)出去內(nèi)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);
//登錄的用戶注冊進去
if(name!=null){
InitServlet.getSocketList().put(name, this);//存放客服ID與用戶
}
}
@Override
public int getReadTimeout() {
return 0;
}
}
在onTextMessage中處理前臺發(fā)出的信息,并封裝信息傳給目標(biāo)
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(dāng)然了,前臺也要按照規(guī)定的格式傳信息
<%@ 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="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);//注意格式
}
</script>
</head>
<body onload="startWebSocket();">
<p>聊天功能實現(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:<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>
這是A.jsp頁面,B同上
通過以上代碼,就可以實現(xiàn)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(tǒng),包括聊天室和單人聊天,都說websocket不支持二進制的傳輸,但是看到個大流說了這樣的話
不過現(xiàn)在做下來 感覺使用二進制的意義不是很大。很久以前就一直困混,怎么都說JS不支持二進制,發(fā)現(xiàn)其實只是一堆坑貨對這個沒研究。。(用的是filereader)
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。