深圳网站建设服务找哪家,潍坊公司网站模板建站,电子商务网站建设 代码,公司网站开发建设什么会计科目WebSocket是基于TCP的一种新的网络协议。它实现了浏览器与服务器全双工通信-浏览器和服务器只需要完成一次握手#xff0c;两者之间就可以创建持久性的连接#xff0c;并实现 双向数据传输。
使用
导入maven坐标
dependencygroupIdorg.springframework.bo…WebSocket是基于TCP的一种新的网络协议。它实现了浏览器与服务器全双工通信-浏览器和服务器只需要完成一次握手两者之间就可以创建持久性的连接并实现 双向数据传输。
使用
导入maven坐标
dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-websocket/artifactId
/dependency前端页面
!DOCTYPE HTML
html
headmeta charsetUTF-8titleWebSocket Demo/title
/head
bodyinput idtext typetext /button onclicksend()发送消息/buttonbutton onclickcloseWebSocket()关闭连接/buttondiv idmessage/div
/body
script typetext/javascriptvar websocket null;var clientId Math.random().toString(36).substr(2);//判断当前浏览器是否支持WebSocketif(WebSocket in window){//连接WebSocket节点websocket new WebSocket(ws://localhost:8080/ws/clientId);}else{alert(Not support websocket)}//连接发生错误的回调方法websocket.onerror function(){setMessageInnerHTML(error);};//连接成功建立的回调方法websocket.onopen function(){setMessageInnerHTML(连接成功);}//接收到消息的回调方法websocket.onmessage function(event){setMessageInnerHTML(event.data);}//连接关闭的回调方法websocket.onclose function(){setMessageInnerHTML(close);}//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(){websocket.close();}//将消息显示在网页上function setMessageInnerHTML(innerHTML){document.getElementById(message).innerHTML innerHTML br/;}//发送消息function send(){var message document.getElementById(text).value;websocket.send(message);}//关闭连接function closeWebSocket() {websocket.close();}
/script
/html
后端Server package com.sky.websocket;import org.springframework.stereotype.Component;
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;/*** WebSocket服务*/
Component
ServerEndpoint(/ws/{sid})
public class WebSocketServer {//存放会话对象private static MapString, Session sessionMap new HashMap();/*** 连接建立成功调用的方法*/OnOpenpublic void onOpen(Session session, PathParam(sid) String sid) {System.out.println(客户端 sid 建立连接);sessionMap.put(sid, session);}/*** 收到客户端消息后调用的方法** param message 客户端发送过来的消息*/OnMessagepublic void onMessage(String message, PathParam(sid) String sid) {System.out.println(收到来自客户端 sid 的信息: message);}/*** 连接关闭调用的方法** param sid*/OnClosepublic void onClose(PathParam(sid) String sid) {System.out.println(连接断开: sid);sessionMap.remove(sid);}/*** 群发** param message*/public void sendToAllClient(String message) {CollectionSession sessions sessionMap.values();for (Session session : sessions) {try {//服务器向客户端发送消息session.getBasicRemote().sendText(message);} catch (Exception e) {e.printStackTrace();}}}}编写配置类
package com.sky.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;/*** WebSocket配置类用于注册WebSocket的Bean*/
Configuration
public class WebSocketConfiguration {Beanpublic ServerEndpointExporter serverEndpointExporter() {return new ServerEndpointExporter();}
}定时任务类
package com.sky.task;import com.sky.websocket.WebSocketServer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;Component
public class WebSocketTask {Autowiredprivate WebSocketServer webSocketServer;/*** 通过WebSocket每隔5秒向客户端发送消息*/Scheduled(cron 0/5 * * * * ?)public void sendMessageToClient() {webSocketServer.sendToAllClient(这是来自服务端的消息 DateTimeFormatter.ofPattern(HH:mm:ss).format(LocalDateTime.now()));}
}
测试成功 public void onActivityResult(ActivityResult result) {if (result ! null) {Intent data result.getData();if (data ! null result.getResultCode() RESULT_OK) {boolean isCheated data.getBooleanExtra(CheatActivity.IS_CHEATED, false);if (isCheated) {Toast.makeText(getApplicationContext(), 使用答案提示, LENGTH_SHORT).show();} else {Toast.makeText(getApplicationContext(), 没有使用答案提示, LENGTH_SHORT).show();}} else {Toast.makeText(getApplicationContext(), 从CheatAcitivity返回, LENGTH_SHORT).show();}}
}
