SpringBoot整合websocket
1.websocket介绍
WebSocket协议是基于TCP的一种新的网络协议。它实现了浏览器与服务器全双工(full-duplex)通信——允许服务器主动发送信息给客户端。websocket 协议是在 http 协议上的一种补充协议,是 html5 的新特性,是一种持久化的协议。
2.应用场景
- 系统实时通告
- 聊天室
- ....
3.spring boot 整合(亲测有效)
(1)导入pom
<!--webSocket-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
(2)websocket配置类:
package com.ruoyi.framework.config.websocked;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
作用:可以将带有 @ServerEndpoint 注解的 WebSocket 端点注册到应用程序中,以便能够处理 WebSocket 连接。
(3)websocket操作类:
package com.ruoyi.project.websorcked;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;
@Component
@ServerEndpoint("/websocket/{userId}")
public class WebSocketServer {
/**
* 日志工具
*/
private Logger logger = LoggerFactory.getLogger(this.getClass());
/**
* 与某个客户端的连接会话,需要通过它来给客户端发送数据
*/
private Session session;
/**
* 用户id
*/
private String userId;
/**
* 用来存放每个客户端对应的MyWebSocket对象
*/
private static CopyOnWriteArraySet<WebSocketServer> webSockets = new CopyOnWriteArraySet<>();
/**
* 用来存在线连接用户信息
*/
private static ConcurrentHashMap<String, Session> sessionPool = new ConcurrentHashMap<String, Session>();
/**
* 链接成功调用的方法
*/
@OnOpen
public void onOpen(Session session, @PathParam(value = "userId") String userId) {
try {
this.session = session;
this.userId = userId;
webSockets.add(this);
sessionPool.put(userId, session);
logger.info("【websocket消息】有新的连接,总数为:" + webSockets.size());
} catch (Exception e) {
}
}
/**
* 链接关闭调用的方法
*/
@OnClose
public void onClose() {
try {
webSockets.remove(this);
sessionPool.remove(this.userId);
logger.info("【websocket消息】连接断开,总数为:" + webSockets.size());
} catch (Exception e) {
}
}
/**
* 收到客户端消息后调用的方法
*/
@OnMessage
public void onMessage(String message) {
logger.info("【websocket消息】收到客户端消息:" + message);
}
/**
* 发送错误时的处理
*
* @param session
* @param error
*/
@OnError
public void onError(Session session, Throwable error) {
logger.error("用户错误,原因:" + error.getMessage());
error.printStackTrace();
}
/**
* 此为广播消息
*/
public static void sendAllMessage(String message) {
// logger.info("【websocket消息】广播消息:" + message);
System.out.println("【websocket消息】广播消息:" + message);
for (WebSocketServer webSocket : webSockets) {
try {
if (webSocket.session.isOpen()) {
webSocket.session.getAsyncRemote().sendText(message);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 此为单点消息
*/
public void sendOneMessage(String userId, String message) {
Session session = sessionPool.get(userId);
if (session != null && session.isOpen()) {
try {
logger.info("【websocket消息】 单点消息:" + message);
session.getAsyncRemote().sendText(message);
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 此为单点消息(多人)
*/
public void sendMoreMessage(String[] userIds, String message) {
for (String userId : userIds) {
Session session = sessionPool.get(userId);
if (session != null && session.isOpen()) {
try {
logger.info("【websocket消息】 单点消息:" + message);
session.getAsyncRemote().sendText(message);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}
说明
-
(1)@ServerEndpoint(“/websocket/{userId}”) 前端通过此 URI 和后端交互,建立连接
-
(2)@Component 不用说将此类交给 spring 管理
-
(3)@OnOpen websocket 建立连接的注解,前端触发上面 URI 时会进入此注解标注的方法
-
(4)@OnMessage 收到前端传来的消息后执行的方法
-
(5)@OnClose 顾名思义关闭连接,销毁 session
(4)前端样例:
var userId = "your_user_id"; // 替换为实际的用户 ID
var socket = new WebSocket("ws://your_server_address/websocket/" + userId);
socket.onopen = function(event) {
// WebSocket 连接已打开
};
socket.onmessage = function(event) {
// 收到来自服务器的消息
var message = event.data;
console.log("Received message: " + message);
};
socket.onclose = function(event) {
// WebSocket 连接已关闭
};
(5)前端demo:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>websocket通讯</title>
</head>
<body>
<p>【socket开启者的ID信息】:<div><input id="userId" name="userId" type="text" value="10"></div>
<p>【客户端向服务器发送的内容】:<div><input id="toUserId" name="toUserId" type="text" value="20">
<input id="contentText" name="contentText" type="text" value="hello websocket"></div>
<p>【操作】:<button><a onclick="openSocket()">开启socket</a></button>
<p>【操作】:<button><a onclick="sendMessage()">发送消息</a></button>
<p>【操作】:<button><a onclick="getMessage()">获取后台广播消息</a></button>
</body>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script>
let socket;
function openSocket() {
const socketUrl = "ws://localhost:80/websocket";
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");
};
//获得消息事件
socket.onmessage = function(msg) {
console.log(msg.data);
//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");
}
}
$(function (){
openSocket();
})
function sendMessage() {
socket.send('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
console.log('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
}
function getMessage(){
$.ajax({
url: '/api/v1/websocket/sendTestMessage',
type: 'get',
data: {
message: '9'
},
success: function (data) {
alert("已成功发送~")
}
});
//获得消息事件
// socket.onmessage = function(msg) {
// console.log(msg.data);
// //发现消息进入,开始处理前端触发逻辑
// };
}
</script>
</html>
(6)效果图:
(7)通过后端接口发送消息到客户端,客户端成功接收:
代码如下
package com.ruoyi.project.websorcked;
import com.ruoyi.framework.web.domain.AjaxResult;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(value = "/api/v1/websocket")
@Api(tags = "websocket接口", value = "AlarmDpController")
public class WebSocketController {
@Autowired
private WebSocketServer webSocketServer;
/**
* 模拟数据发送
*/
@ApiOperation(value = "模拟数据发送", notes = "模拟数据发送")
@ApiImplicitParams({
@ApiImplicitParam(paramType = "query", name = "message", value = "模拟消息", required = true, dataType = "String"),
})
@RequestMapping(value = "/sendTestMessage", method = RequestMethod.GET)
public AjaxResult sendTestMessage(@RequestParam("message")String message) {
AjaxResult ajaxJson = new AjaxResult();
try {
webSocketServer.sendAllMessage(message);
} catch (Exception e) {
e.printStackTrace();
// return AjaxJson.returnExceptionInfo(LoitStatusMsg.LOIT_USER_LOGIN_FAIL);
}
return ajaxJson;
}
}
4.遇到的问题
(1) websocket发送连接请求到服务端,报错Filed
解决如下,因为我使用的是若依的项目,使用的安全框架为shiro,在shiro的config类中添加白名单放行
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