一、整合websocket
<!-- 引入websocket依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
开启websocket功能
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
websocket配置类
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
@Configuration
public class WebSocketConfig {
/**
* ServerEndpointExporter 作用
*
* 这个Bean会自动注册使用@ServerEndpoint注解声明的websocket endpoint
*
* @return
*/
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
websocket核心类
package com.winmine.WebSocket.service;
import org.springframework.stereotype.Component;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
@ServerEndpoint("/webSocket/{sid}")
@Component
public class WebSocketServer {
//静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
private static AtomicInteger onlineNum = new AtomicInteger();
//concurrent包的线程安全Set，用来存放每个客户端对应的WebSocketServer对象。
private static ConcurrentHashMap<String, Session> sessionPools = new ConcurrentHashMap<>();
//发送消息
public void sendMessage(Session session, String message) throws IOException {
if(session != null){
synchronized (session) {
// System.out.println("发送数据：" + message);
session.getBasicRemote().sendText(message);
}
}
}
//给指定用户发送信息
public void sendInfo(String userName, String message){
Session session = sessionPools.get(userName);
try {
sendMessage(session, message);
}catch (Exception e){
e.printStackTrace();
}
}
//建立连接成功调用
@OnOpen
public void onOpen(Session session, @PathParam(value = "sid") String userName){
sessionPools.put(userName, session);
addOnlineCount();
System.out.println(userName + "加入webSocket！当前人数为" + onlineNum);
try {
sendMessage(session, "欢迎" + userName + "加入连接！");
} catch (IOException e) {
e.printStackTrace();
}
}
//关闭连接时调用
@OnClose
public void onClose(@PathParam(value = "sid") String userName){
sessionPools.remove(userName);
subOnlineCount();
System.out.println(userName + "断开webSocket连接！当前人数为" + onlineNum);
}
//收到客户端信息
@OnMessage
public void onMessage(String message) throws IOException{
message = "客户端：" + message + ",已收到";
System.out.println(message);
for (Session session: sessionPools.values()) {
try {
sendMessage(session, message);
} catch(Exception e){
e.printStackTrace();
continue;
}
}
}
//错误时调用
@OnError
public void onError(Session session, Throwable throwable){
System.out.println("发生错误");
throwable.printStackTrace();
}
public static void addOnlineCount(){
onlineNum.incrementAndGet();
}
public static void subOnlineCount() {
onlineNum.decrementAndGet();
}
}
在Controller中跳转页面
import com.winmine.WebSocket.service.WebSocketServer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import java.util.HashMap;
import java.util.Map;
@Controller
public class SocketController {
@Autowired
private WebSocketServer webSocketServer;
@RequestMapping("/index")
public String index() {
return "index";
}
@GetMapping("/webSocket")
public ModelAndView socket() {
ModelAndView mav=new ModelAndView("/webSocket");
// mav.addObject("userId", userId);
return mav;
}
}
前端代码在webSocket.html中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>WebSocket</title>
</head>
<body>
<h3>hello socket</h3>
<p>【userId】：<div><input id="userId" name="userId" type="text" value="10"></div>
<p>【toUserId】：<div><input id="toUserId" name="toUserId" type="text" value="20"></div>
<p>【toUserId】：<div><input id="contentText" name="contentText" type="text" value="hello websocket"></div>
<p>操作:<div><a onclick="openSocket()">开启socket</a></div>
<p>【操作】：<div><a onclick="sendMessage()">发送消息</a></div>
</body>
<script>
var socket;
function openSocket() {
if(typeof(WebSocket) == "undefined") {
console.log("您的浏览器不支持WebSocket");
}else{
console.log("您的浏览器支持WebSocket");
//实现化WebSocket对象，指定要连接的服务器地址与端口 建立连接
var userId = document.getElementById('userId').value;
// var socketUrl="ws://127.0.0.1:22599/webSocket/"+userId;
var socketUrl="ws://192.168.0.231:22599/webSocket/"+userId;
console.log(socketUrl);
if(socket!=null){
socket.close();
socket=null;
}
socket = new WebSocket(socketUrl);
//打开事件
socket.onopen = function() {
console.log("websocket已打开");
//socket.send("这是来自客户端的消息" + location.href + new Date());
};
//获得消息事件
socket.onmessage = function(msg) {
var serverMsg = "收到服务端信息：" + msg.data;
console.log(serverMsg);
//发现消息进入 开始处理前端触发逻辑
};
//关闭事件
socket.onclose = function() {
console.log("websocket已关闭");
};
//发生了错误事件
socket.onerror = function() {
console.log("websocket发生了错误");
}
}
}
function sendMessage() {
if(typeof(WebSocket) == "undefined") {
console.log("您的浏览器不支持WebSocket");
}else {
// console.log("您的浏览器支持WebSocket");
var toUserId = document.getElementById('toUserId').value;
var contentText = document.getElementById('contentText').value;
var msg = '{"toUserId":"'+toUserId+'","contentText":"'+contentText+'"}';
console.log(msg);
socket.send(msg);
}
}
</script>
</html>
参考链接：https://www.cnblogs.com/JohanChan/p/12522001.html
https://www.kancloud.cn/hanxt/springboot2/1185843