首先给大家声明一点：需要 jdk 7 ， tomcat需要支持websocket的版本
1.InitServlet
该类主要是用来初始化构造将来存储用户身份信息的map仓库，利用其初始化方法Init 初始化仓库， 利用其静态方法getSocketList 获得对应的用户身份信息。
webSocket ，我认为MessageInbound 用来识别登录人的信息，用它来找到对应的人，推送消息。每次登录都会产生一个MessageInbound。
这里的 HashMap<String,MessageInbound> ：string 存储用户session的登录id,MessageInbound存储 推送需要的身份信息。以上属于个人口头话理解。
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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;
}
*/}
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2.MyWebSocketServlet
websocket用来建立连接的servlet，建立连接时，首先在session获取该登录人的userId，在调用MyMessageInbound构造函数传入userId
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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: 建立连接时创立
* @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));
}
}
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3.onOpen方法调用InitServlet的map身份仓库，
放入用户userId 和 对应该登录用户的websocket身份信息MessageInbound （可以用userId来寻找到推送需要的 身份MessageInbound ）
onTextMessage ：用来获取消息，并发送消息
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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
if(messageInbound!=null){ //如果发往人 存在进行操作
WsOutbound outbound = messageInbound.getWsOutbound();
String content = messageMap.get("content"); //获取消息内容
String msgContentString = fromName + " " + content; //构造发送的消息
//发出去内容
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);
//登录的用户注册进去
if(name!=null){
InitServlet.getSocketList().put(name, this);
}
// InitServlet.getSocketList().add(this);
}
}
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4.消息处理类，处理前端发来的消息
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package util;
import java.nio.CharBuffer;
import java.util.HashMap;
/**
*
* @ClassName: MessageUtil
* @Description: 消息处理类
* @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;
}
}
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5.web配置
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<?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>
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6,前端，为方便起见，我直接用了两个jsp，在其中用<%session.setAttribute("user","小明")%>；来表示登录。
两个jsp没任何本质差别，只是用来表示两个不同的人登录，可以同两个浏览器打开不同的jsp，来聊天操作
A.小化
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<%@ 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="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);
}
</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：<textarea rows="" cols="" readonly id="xiaoxi"></textarea>
<br>
<input type="button" value="send" onclick="sendMsg()"></input>
</body>
</html>
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B.小明
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<%@ 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="离线";
};
ws.onopen = function(evt) {
//alert("open");
document.getElementById('denglu').innerHTML="在线";
document.getElementById('userName').innerHTML="小明";
};
}
function sendMsg() {
var fromName = "小明";
var toName = document.getElementById('name').value; //发给谁
var content = document.getElementById('writeMsg').value; //发送内容
ws.send(fromName+","+toName+","+content);
}
</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="小化"></input>
<br>
发送内容：<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>
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以上所述是小编给大家介绍的使用JavaWeb webSocket实现简易的点对点聊天功能实例代码的相关知识，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！