1.后端整合websocket （STOMP协议）
2.群发、指定单发
3.前端简单页面示例（接收、发送消息）
1. pom.xml 核心依赖的导入：
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>2.application.yml (我就单纯设置一下端口)
server:
port: 99083.WebSocketConfig.java
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
/**
* @Author JCccc
* @Description EnableWebSocketMessageBroker-注解开启STOMP协议来传输基于代理的消息，此时控制器支持使用@MessageMapping
* @Date 2021/6/30 8:53
*/
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
//topic用来广播，user用来实现点对点
config.enableSimpleBroker("/topic", "/user");
}
/**
* 开放节点
* @param registry
*/
@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
//注册两个STOMP的endpoint，分别用于广播和点对点
//广播
registry.addEndpoint("/publicServer").setAllowedOrigins("*").withSockJS();
//点对点
registry.addEndpoint("/privateServer").setAllowedOrigins("*").withSockJS();
}
}4.推送消息的实体类 Message.java
/**
* @Author JCccc
* @Description
* @Date 2021/8/20 9:26
*/
public class Message {
/**
* 消息编码
*/
private String code;
/**
* 来自（保证唯一）
*/
private String form;
/**
* 去自（保证唯一）
*/
private String to;
/**
* 内容
*/
private String content;
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getForm() {
return form;
}
public void setForm(String form) {
this.form = form;
}
public String getTo() {
return to;
}
public void setTo(String to) {
this.to = to;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}5.前端简单调试页面
① publicExample.html 监听广播消息的测试页面
<html>
<head>
<meta charset="UTF-8">
<title>等系统推消息</title>
<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://code.jquery.com/jquery-3.2.0.min.js"
integrity="sha256-JAW99MJVpJBGcbzEuXk4Az05s/XyDdBomFqNlM3ic+I=" crossorigin="anonymous"></script>
<script type="text/javascript">
var stompClient = null;
function setConnected(connected) {
document.getElementById("connect").disabled = connected;
document.getElementById("disconnect").disabled = !connected;
$("#response").html();
}
function connect() {
var socket = new SockJS("http://localhost:9908/publicServer");
stompClient = Stomp.over(socket);
stompClient.connect({}, function (frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe('/topic/all', function (response) {
var responseData = document.getElementById('responseData');
var p = document.createElement('p');
p.style.wordWrap = 'break-word';
p.appendChild(document.createTextNode(response.body));
responseData.appendChild(p);
});
},{});
}
function disconnect() {
if (stompClient != null) {
stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}
function sendMsg() {
var content = document.getElementById('content').value;
stompClient.send("/all",{},JSON.stringify({'content': content}));
}
</script>
</head>
<body onload="disconnect()">
<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websocket relies on Javascript being
enabled. Please enable
Javascript and reload this page!</h2></noscript>
<div>
<div>
<labal>连接广播频道</labal>
<button id="connect" onclick="connect();">Connect</button>
<labal>取消连接</labal>
<button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button>
</div>
<div id="conversationDiv">
<labal>广播消息</labal>
<input type="text" id="content"/>
<button id="sendMsg" onclick="sendMsg();">Send</button>
</div>
<div>
<labal>接收到的消息:</labal>
<p id="responseData"></p>
</div>
</div>
</body>
</html>简析：
趁热打铁，我们模拟系统后端给前端推送广播消息，通过接口模拟：
TestController.java
/**
* @Author JCccc
* @Description
* @Date 2021/8/20 8:53
*/
@Controller
public class TestController {
@Autowired
public SimpMessagingTemplate template;
/**
* 广播
*
* @param msg
*/
@ResponseBody
@RequestMapping("/pushToAll")
public void subscribe( @RequestBody Message msg) {
template.convertAndSend("/topic/all", msg.getContent());
}
}简析：
我们推送消息，直接用 SimpMessagingTemplate ，
用的是convertAndSend 广播方式推送到对于的主题目的地 destination 。
（可以看到其实还有convertAndSendToUser ，不着急，后面会说，这是发送给某个连接用户的）
直接把项目跑起来，打开页面开始测试：
我们先点击connect ，连接成功：
可以看到实际上stomp.min.js 最终也是转化成为 ws/wss这种方式成功连接：
调用测试接口，推送广播消息：
在console其实也能看到：
广播功能就到这，接下来是 点对点。
前端页面：
privateExample.html
<html>
<head>
<meta charset="UTF-8">
<title>聊起来</title>
<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://code.jquery.com/jquery-3.2.0.min.js"
integrity="sha256-JAW99MJVpJBGcbzEuXk4Az05s/XyDdBomFqNlM3ic+I=" crossorigin="anonymous"></script>
<script type="text/javascript">
var stompClient = null;
function setConnected(connected) {
document.getElementById("connect").disabled = connected;
document.getElementById("disconnect").disabled = !connected;
$("#response").html();
}
function connect() {
var socket = new SockJS("http://localhost:9908/privateServer");
stompClient = Stomp.over(socket);
stompClient.heartbeat.outgoing = 20000;
// client will send heartbeats every 20000ms
stompClient.heartbeat.incoming = 0;
stompClient.connect({}, function (frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe('/user/' + document.getElementById('user').value + '/message', function (response) {
var responseData = document.getElementById('responseData');
var p = document.createElement('p');
p.style.wordWrap = 'break-word';
p.appendChild(document.createTextNode(response.body));
responseData.appendChild(p);
});
});
}
function disconnect() {
if (stompClient != null) {
stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}
function sendMsg() {
var headers = {
login: 'mylogin',
passcode: 'mypasscode',
// additional header
'accessToken': 'HWPO325J9814GBHJF933'
};
var content = document.getElementById('content').value;
var to = document.getElementById('to').value;
stompClient.send("/alone", {'accessToken': 'HWPO325J9814GBHJF933'}, JSON.stringify({
'content': content,
'to': to
}));
}
</script>
</head>
<body onload="disconnect()">
<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websocket relies on Javascript being
enabled. Please enable
Javascript and reload this page!</h2></noscript>
<div>
<div>
<labal>连接用户</labal>
<input type="text" id="user"/>
<button id="connect" onclick="connect();">Connect</button>
</div>
<div>
<labal>取消连接</labal>
<button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button>
</div>
<div id="conversationDiv">
<labal>发送消息</labal>
<div>
<labal>内容</labal>
<input type="text" id="content"/>
</div>
<div>
<labal>发给谁</labal>
<input type="text" id="to"/>
</div>
<button id="sendMsg" onclick="sendMsg();">Send</button>
</div>
<div>
<labal>接收到的消息:</labal>
<p id="responseData"></p>
</div>
</div>
</body>
</html>简析：
趁热打铁，我们模拟系统后端给前端推送点对点消息（指定某个用户），通过接口模拟：
/**
* 点对点
*/
@ResponseBody
@RequestMapping("/pushToOne")
public void queue(@RequestBody Message msg) {
System.out.println("进入方法");
/*使用convertAndSendToUser方法，第一个参数为用户id，此时js中的订阅地址为
"/user/" + 用户Id + "/message",其中"/user"是固定的*/
template.convertAndSendToUser(msg.getTo(), "/message", msg.getContent());
}用的是convertAndSendToUser 推送到指定的用户 ，对于的主题目的地 destination（/message）
也许看到这里，你会觉得很奇怪，为什么我们推的主题是 /message，但是前端订阅的却是
"/user/" + 用户Id + "/message"
其实spring还提供了一些好玩的注解，
@MessageMapping 这个注解是对称于 @EnableWebSocketMessageBroker
也就是说，如果我们使用@EnableWebSocketMessageBroker ，那么我们在接口上面其实就能直接使用 @MessageMapping。
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