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java中使用WebSocket

核桃牛奶 1479

前言:

今天各位老铁们对“java中websocket”可能比较着重,各位老铁们都想要知道一些“java中websocket”的相关知识。那么小编也在网摘上网罗了一些关于“java中websocket””的相关文章,希望咱们能喜欢,看官们快快来了解一下吧!

今天来给大家介绍一下java中怎么使用Websocket

首先我们创建客户端页面,在这里我是用的是jsp页面,首先我们要导入javaee-api.7.0jar,tomact使用7.0以上版本。好了,直接上页面,创建一个jsp页面,

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<input id="text" type="text"/>

<button onclick="send()">发送消息</button>

<hr/>

<button onclick="closeWebSocket()">关闭WebSocket连接</button>

<hr/>

<div id="message"></div>

</body>

<script type="text/javascript">

var websocket=new WebSocket("ws://localhost:8080/WebSocket/eoch");

//连接

websocket.onopen=function(){

document.getElementById("message").innerHTML="WebSocket连接成功。。。";

}

//websocket连接发生错误

websocket.onerror=function(){

document.getElementById("message").innerHTML="WebSocket连接异常。。。";

}

//关闭websocket连接

websocket.onclose=function(){

document.getElementById("message").innerHTML="WebSocket关闭成功。。。";

}

//发送消息

websocket.onmessage=function(event){

document.getElementById("message").innerHTML=event.data;

}

//监听窗口关闭事件,当窗口关闭时,主动去关闭websocket连接,防止连接还没断开就关闭窗口,server端会抛异常。

window.onbeforeunload = function () {

closeWebSocket();

}

function closeWebSocket(){

websocket.close();

}

function send(){

var content=document.getElementById("text").value;

websocket.send(content);//发送信息

}

</script>

</html>

以上就是客户端程序,接下来创建服务器端

package com.common;

import java.io.IOException;

import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.OnClose;

import javax.websocket.OnError;

import javax.websocket.OnMessage;

import javax.websocket.OnOpen;

import javax.websocket.Session;

import javax.websocket.server.ServerEndpoint;

@ServerEndpoint(value="/eoch")

public class HttpWebSocket {

private static int onlineCount=0;//在线人数

private static CopyOnWriteArraySet<HttpWebSocket> webSocketSet = new CopyOnWriteArraySet<HttpWebSocket>();

private Session session;

//连接websocket

@OnOpen

public void onopen(Session session){

this.session=session;

webSocketSet.add(this);

addOnlineCount();

System.out.println("有新的连接加入,当前在线人数"+onlineCount);

}

@OnClose

public void onclose(){

webSocketSet.remove(this);

subOnlineCount();

System.out.println("有一连接关闭!当前在线人数为" + getOnlineCount());

}

@OnError

public void onError(Session session,Throwable e){

System.out.println("websocket连接异常");

e.printStackTrace();

}

public void sendMessage(String message) throws IOException{

this.session.getBasicRemote().sendText(message);

}

@OnMessage

public void onMessage(String message, Session session) {

System.out.println("来自客户端的消息:" + message);

//群发消息

for(HttpWebSocket item: webSocketSet){

try {

item.sendMessage(message);

} catch (IOException e) {

e.printStackTrace();

continue;

}

}

}

private int getOnlineCount() {

return onlineCount;

}

private static synchronized void addOnlineCount() {

onlineCount++;

}

private static synchronized void subOnlineCount() {

onlineCount--;

}

}

出现以上界面,表示你的websocket已经连接成功了,有兴趣的朋友欢迎加群咨询

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标签: #java中websocket