一、介绍

二、入门案例

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();}}

websocket：

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 Map<String, 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) {Collection<Session> 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();}}}}

定时任务： 

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()));}
}

三、语音播报

来订单：

    /*** 订单支付** @param ordersPaymentDTO* @return*/public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {// 当前登录用户idLong userId = BaseContext.getCurrentId();User user = userMapper.getById(userId);/*        //调用微信支付接口，生成预支付交易单JSONObject jsonObject = weChatPayUtil.pay(ordersPaymentDTO.getOrderNumber(), //商户订单号new BigDecimal(0.01), //支付金额，单位 元"苍穹外卖订单", //商品描述user.getOpenid() //微信用户的openid);if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {throw new OrderBusinessException("该订单已支付");}*/JSONObject jsonObject = new JSONObject();jsonObject.put("code", "ORDERPAID");OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);vo.setPackageStr(jsonObject.getString("package"));//为替代微信支付成功后的数据库订单状态更新，多定义一个方法进行修改Integer OrderPaidStatus = Orders.PAID; //支付状态，已支付Integer OrderStatus = Orders.TO_BE_CONFIRMED;  //订单状态，待接单//发现没有将支付时间 check_out属性赋值，所以在这里更新LocalDateTime check_out_time = LocalDateTime.now();orderMapper.updateStatus(OrderStatus, OrderPaidStatus, check_out_time, orderId);//通过websocket向客户端浏览器推送消息  type orderId contentMap map= new HashMap();map.put("type",1); //1表示来单提醒 2表示客户催单map.put("orderId",orderId);map.put("content","订单号："+orderMapper.getById(orderId).getNumber());String s = JSON.toJSONString(map);webSocketServer.sendToAllClient(s);return vo;}

催单：