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websocket如何向客户端发送消息(代码来自网友)

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悬赏园豆:5 [已关闭问题] 关闭于 2018-08-29 17:54
前端代码
<%
@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <title>WebSoket Demo</title> <script type="text/JavaScript"> //验证浏览器是否支持WebSocket协议 if (!window.WebSocket) { alert("WebSocket not supported by this browser!"); } var ws; var log = function(s) { console.log("s"+s); if (document.readyState !== "complete") { console.log("s"+s); log.buffer.push(s); } else { document.getElementById("contentId").innerHTML += (s + "\n"); } } function sendMsg(){ var msg=document.getElementById("messageId"); //alert(msg.value); ws.send(msg.value); } function getd() { //var valueLabel = document.getElementById("valueLabel"); //valueLabel.innerHTML = ""; ws=new WebSocket("ws://localhost:8080/WebSocketChat/websocket"); //监听消息 ws.onmessage = function(event) { //valueLabel.innerHTML+ = event.data; alert("a"); log(event.data); }; // 打开WebSocket ws.onclose = function(event) { //WebSocket Status:: Socket Closed }; // 打开WebSocket ws.onopen = function(event) { //WebSocket Status:: Socket Open //// 发送一个初始化消息 ws.send("Hello, Server!"+"%%%4"); //连接websocket 传递userId }; ws.onerror =function(event){ //WebSocket Status:: Error was reported }; } </script> </head> <body onload="getd()"> <div id="valueLabel"></div> <textarea rows="20" cols="30" id="contentId"></textarea> <br/> <input name="message" id="messageId"/> <button id="sendButton" onClick="javascript:sendMsg()" >Send</button> </body> </html>

后端代码

package com;
 
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
 


import javax.servlet.http.HttpServletRequest;
 
import javax.websocket.Session;

import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;
import org.apache.catalina.websocket.WsOutbound;
 
public class De extends WebSocketServlet {
 
    /**
* 
*/
    private static final long serialVersionUID = 1L;
 
    //存储用户和链接
    private static Map<String, MessageInbound> maps = new ConcurrentHashMap<String, MessageInbound>();
 
    @Override
    protected StreamInbound createWebSocketInbound(String subProtocol, HttpServletRequest request) {
        // TODO Auto-generated method stub
        return new WebSocketMessageInbound();
    }
 
    public class WebSocketMessageInbound extends MessageInbound {
 
        @Override
        protected void onClose(int status) {
            // InitServlet.getSocketList().remove(this);
            //super.onClose(status);
            System.out.println("onClose");
        }
 
        @Override
        protected void onOpen(WsOutbound outbound) {
            //super.onOpen(outbound);
            System.out.println("打开");
        }
 
        @Override
        protected void onBinaryMessage(ByteBuffer message) throws IOException {
            // TODO Auto-generated method stub
            System.out.println("....");
        }

        @Override
        protected void onTextMessage(CharBuffer message) throws IOException {
            // TODO Auto-generated method stub
            System.out.println(message.toString());
        }

    }
}
问题补充:

使用到的jar包(catalina.jar,tomcat-coyote.jar)

tpy的主页 tpy | 初学一级 | 园豆:13
提问于:2018-08-28 18:52
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