WebSocket简单入门

傷城~ 2022-06-01 02:15 226阅读 0赞

WebSocket的介绍和相关协议可以自行百度哈，我这里直接贴代码，实现客户端和服务端的简易通信

**前端代码 index.jsp**

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    
    
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    <script src="js/jquery-1.11.3.min.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
    	<input type="text" id="content"><input type="button" value="发送" id="send">
    	<br>客户端的消息：<textarea rows="10" cols="10" id="clientShow"></textarea><br/>
    	服务器端的消息：<textarea rows="10" cols="10" id="serverShow"></textarea>
    	
    	<script type="text/javascript">
    		$(function (){
    			
    			
    		});
    		
    		var wsServer = null;
    	    var ws = null;
    	    wsServer = "ws://" + location.host+"${pageContext.request.contextPath}" + "/testSocket";
    	    ws = new WebSocket(wsServer); //创建WebSocket对象
    	    ws.onopen = function (evt) {
    	        alert("连接已经建立....");
    	    };
    	    ws.onmessage = function(evt) {//获得后台传来的消息时，触发的事件
    	    	alert(evt.data);
    			$("#serverShow").val(evt.data);
    	    		
    	    };
    	    
    	    $("#send").click(function (){
    	    	var message = $("#content").val();
    	    	if(message == null || message == ""){
    	            alert("不能发空消息！");
    	            return;
    	        }
    	    	ws.send("客户端的消息："+message);
    	    	$("#clientShow").val(message);
    	    });
    	   
    	</script>
    </body>
    </html>

**后端服务器代码**

package com.ruicai.web;
    
    import java.util.ArrayList;
    import java.util.List;
    
    
    import javax.websocket.EndpointConfig;
    import javax.websocket.OnClose;
    import javax.websocket.OnMessage;
    import javax.websocket.OnOpen;
    import javax.websocket.Session;
    import javax.websocket.server.ServerEndpoint;
    
    
    @ServerEndpoint(value="/testSocket")
    public class WebSocket{
    	
    	
    	private Session session;
    
    	
    	private static List<String> ids=new ArrayList<String>();
    	
    	@OnOpen
    	public void onOpen(Session session,EndpointConfig config){
    		this.session=session;
    		System.out.println("连接打开来自"+session.getId());
    		
    	}
    	
    	@OnMessage
    	public void onMessage(String message){
    		
    
            for (Session openSession : session.getOpenSessions()) {
            	openSession.getAsyncRemote().sendText(message+"服务器已经收到消息");
            }
    		
    		System.out.println("webSocket接受来自sessionID"+session.getId()+"的信息："+message);
    	}
    	
    	@OnClose
    	public void onClose(){
    		System.out.println("连接关闭");
    	}
    }