springboot基础环境
请参考springboot文档
maven依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
代码准备
准备常量类
//webSocket相关配置
//链接地址
public static String WEBSOCKETPATHPERFIX = "/ws-push";
public static String WEBSOCKETPATH = "/endpointWisely";
//消息代理路径
public static String WEBSOCKETBROADCASTPATH = "/topic";
//前端发送给服务端请求地址
public static final String FORETOSERVERPATH = "/welcome";
//服务端生产地址,客户端订阅此地址以接收服务端生产的消息
public static final String PRODUCERPATH = "/topic/getResponse";
//点对点消息推送地址前缀
public static final String P2PPUSHBASEPATH = "/user";
//点对点消息推送地址后缀,最后的地址为/user/用户识别码/msg
public static final String P2PPUSHPATH = "/msg";
接收前端消息实体
public class WiselyMessage {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
后台发送消息实体
private String responseMessage;
public WiselyResponse(String responseMessage){
this.responseMessage = responseMessage;
}
public String getResponseMessage() {
return responseMessage;
}
public void setResponseMessage(String responseMessage) {
this.responseMessage = responseMessage;
}
配置websocket
@Configuration
// @EnableWebSocketMessageBroker注解用于开启使用STOMP协议来传输基于代理（MessageBroker）的消息，这时候控制器（controller）
// 开始支持@MessageMapping,就像是使用@requestMapping一样。
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
@Override
public void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {
//注册一个Stomp的节点（endpoint）,并指定使用SockJS协议。
stompEndpointRegistry.addEndpoint(Constant.WEBSOCKETPATH).withSockJS();
}
@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
//服务端发送消息给客户端的域,多个用逗号隔开
registry.enableSimpleBroker(Constant.WEBSOCKETBROADCASTPATH, Constant.P2PPUSHBASEPATH);
//定义一对一推送的时候前缀
registry.setUserDestinationPrefix(Constant.P2PPUSHBASEPATH);
//定义websoket前缀
registry.setApplicationDestinationPrefixes(Constant.WEBSOCKETPATHPERFIX);
}
}
service
@Service
public class WebSocketService {
@Autowired
private SimpMessagingTemplate template;
/**
* 广播
* 发给所有在线用户
*
* @param msg
*/
public void sendMsg(WiselyResponse msg) {
template.convertAndSend(Constant.PRODUCERPATH, msg);
}
/**
* 发送给指定用户
* @param users
* @param msg
*/
public void send2Users(List<String> users, WiselyResponse msg) {
users.forEach(userName -> {
template.convertAndSendToUser(userName, Constant.P2PPUSHPATH, msg);
});
}
}
控制器
@Controller
public class WsController {
@Resource
WebSocketService webSocketService;
@MessageMapping(Constant.FORETOSERVERPATH)//@MessageMapping和@RequestMapping功能类似，用于设置URL映射地址，浏览器向服务器发起请求，需要通过该地址。
@SendTo(Constant.PRODUCERPATH)//如果服务器接受到了消息，就会对订阅了@SendTo括号中的地址传送消息。
public WiselyResponse say(WiselyMessage message) throws Exception {
List<String> users = Lists.newArrayList();
users.add("d892bf12bf7d11e793b69c5c8e6f60fb");//此处写死只是为了方便测试,此值需要对应页面中订阅个人消息的userId
webSocketService.send2Users(users, new WiselyResponse("admin hello"));
return new WiselyResponse("Welcome, " + message.getName() + "!");
}
}
页面
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8" />
<title>Spring Boot+WebSocket+广播式</title>
</head>
<body onload="disconnect()">
<noscript><h2 style="color: #ff0000">貌似你的浏览器不支持websocket</h2></noscript>
<div>
<div>
<button id="connect" onclick="connect();">连接</button>
<button id="disconnect" disabled="disabled" onclick="disconnect();">断开连接</button>
</div>
<div id="conversationDiv">
<label>输入你的名字</label><input type="text" id="name" />
<button id="sendName" onclick="sendName();">发送</button>
<p id="response"></p>
<p id="response1"></p>
</div>
</div>
<!--<script th:src="@{sockjs.min.js}"></script>
<script th:src="@{stomp.min.js}"></script>
<script th:src="@{jquery.js}"></script>-->
<script src="https://cdn.bootcss.com/sockjs-client/1.1.4/sockjs.min.js"></script>
<script src="https://cdn.bootcss.com/stomp.js/2.3.3/stomp.min.js"></script>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script th:inline="javascript">
var stompClient = null;
//此值有服务端传递给前端,实现方式没有要求
var userId = [[${userId}]];
function setConnected(connected) {
document.getElementById('connect').disabled = connected;
document.getElementById('disconnect').disabled = !connected;
document.getElementById('conversationDiv').style.visibility = connected ? 'visible' : 'hidden';
$('#response').html();
}
function connect() {
var socket = new SockJS('/endpointWisely'); //1连接SockJS的endpoint是“endpointWisely”，与后台代码中注册的endpoint要一样。
stompClient = Stomp.over(socket);//2创建STOMP协议的webSocket客户端。
stompClient.connect({}, function(frame) {//3连接webSocket的服务端。
setConnected(true);
console.log('开始进行连接Connected: ' + frame);
//4通过stompClient.subscribe（）订阅服务器的目标是'/topic/getResponse'发送过来的地址，与@SendTo中的地址对应。
stompClient.subscribe('/topic/getResponse', function(respnose){
showResponse(JSON.parse(respnose.body).responseMessage);
});
//4通过stompClient.subscribe（）订阅服务器的目标是'/user/' + userId + '/msg'接收一对一的推送消息,其中userId由服务端传递过来,用于表示唯一的用户,通过此值将消息精确推送给一个用户
stompClient.subscribe('/user/' + userId + '/msg', function(respnose){
console.log(respnose);
showResponse1(JSON.parse(respnose.body).responseMessage);
});
});
}
function disconnect() {
if (stompClient != null) {
stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}
function sendName() {
var name = $('#name').val();
//通过stompClient.send（）向地址为"/welcome"的服务器地址发起请求，与@MessageMapping里的地址对应。因为我们配置了registry.setApplicationDestinationPrefixes(Constant.WEBSOCKETPATHPERFIX);所以需要增加前缀/ws-push/
stompClient.send("/ws-push/welcome", {}, JSON.stringify({ 'name': name }));
}
function showResponse(message) {
var response = $("#response");
response.html(message);
}
function showResponse1(message) {
var response = $("#response1");
response.html(message);
}
</script>
</body>
</html>
测试
点击连接控制台输出
此时服务端控制器接收到请求
同时给指定用户发送了消息,所以控制台接收到消息
同时因为控制器有注解@SendTo所以会向@SendTo的地址广播消息,客户端订阅了广播地址所有控制台显示接收了消息
