我正在使用 socketio 和 netty 以及 java，我对它们都是新手。
我的客户端代码如下所示。
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
<title >webSocket test</title>
<script src="http://code.jquery.com/jquery-1.12.4.min.js"></script>
<script src="https://cdn.socket.io/3.1.3/socket.io.min.js" integrity="sha384-cPwlPLvBTa3sKAgddT6krw0cJat7egBga3DJepJyrLl4Q9/5WLra3rrnMcyTyOnh" crossorigin="anonymous"></script>
< !-- New Bootstrap core CSS file-->
<!-- Optional Bootstrap theme file (generally not necessary to import) -->
<!- -jQuery file. Be sure to introduce before bootstrap.min.js -->
<!-- The latest Bootstrap core JavaScript file-->
<script type=" text/javascript">
$(function(){
/**
* The socket.emit("event name", "parameter data") method of the
front-end js is used when triggering the back-end custom message event, * front-end js The socket.on("event name", anonymous function (data sent by the server to the client)) for monitoring server-side events
**/
//io({path: 'ws://localhost:9099/', transports: ['websocket'] ,upgrade: false});
var socket = io.connect("ws://localhost:9099",{transports: ['websocket'] ,upgrade: false});
var firstconnect = true;
if(firstconnect) {
console.log("First connection initialization");
//Monitor server connection event
socket.on('connect',function(){
socket.emit('messageEvent', 'Hello server');
console.log("First connection success");
$("#tou").html("Connect to the server successfully!");
});
//Monitor server shutdown service event
socket.on('disconnect', function(){
$("#tou").html("Disconnected from the server!");
});
//Monitor server Send message event
socket.on('responseEvent', function(data) {
console.log('data');
$("#msg").html($("#msg").html() + "<br/>" + data);
} );
firstconnect = false;
} else {
console.log("why?");
socket.socket.reconnect();
}
$('#send').bind('click', function() {
send();
});
function send(){
if (socket != null) {
var message = document.getElementById('message').value;
var title = "message";
var obj = {message:message,title:title};
var str = JSON.stringify(obj);
socket.emit("messageEvent",str);
console.log("message event" , str);
} else {
alert('Send');
}
}
});
</script>
</head>
<body>
<div class="page-header" id="tou">
webSocket Demo
</div>
<div class="well" id="msg">
</div>
<div class="col-lg">
<div class="input-group">
<input type="text" class="form-control" placeholder="send Message..." id="message">
<span class="input-group-btn">
<button class="btn btn-default" type="button" id="send" >send</button>
</span>
</div><!-- /input-group -->
</div><!-- /.col-lg-6 -->
</div><!-- /.row --><br><br>
</body>
</html>
事件处理程序如下所示。
@Component
public class MessageEventHandler {
private static final Logger logger = LoggerFactory.getLogger(MessageEventHandler.class);
public static ConcurrentMap<String, SocketIOClient> socketIOClientMap = new ConcurrentHashMap<>();
@Autowired
private RedissonClient redisson;
@Resource
private SocketIOServer socketIOServer;
@OnConnect
public void onConnect(SocketIOClient client){
Map<String,Object> clientMap = new HashMap<>(16);
client.sendEvent("responseEvent", client.getSessionId().toString()+": "+ "hello");
if(client!=null){
String room = client.getHandshakeData().getSingleUrlParam("room");
String nameSpace = client.getNamespace().getName();
logger.info("namespace {} ",nameSpace);
String sessionId = client.getSessionId().toString();
logger.info("namespace, room={}, sessionId={},namespace={}",room,sessionId,nameSpace);
if(StringUtils.isEmpty(room)){
//client.joinRoom(room);
clientMap.put("rooms",room);
}
clientMap.put("createTime", LocalDateTime.now().toString());
redisson.getBucket("room"+sessionId).trySet(clientMap);
}
return;
}
/**
* Triggered when the client closes the connection
*
* @param client
*/
@OnDisconnect
public void onDisconnect(SocketIOClient client) {
logger.info("client:" + client.getSessionId() + "disconnected");
}
/**
* Client events
*
* @param client
* @param request
* @param msg
*/
@OnEvent(value = "messageEvent")
public void onMessageEvent(SocketIOClient client, AckRequest request, String msg) {
System.out.println("haha");
logger.info("message ：" + msg);
//Post the message back
JSONObject jsonObject = JSON.parseObject(msg);
String message = jsonObject.getString("message");
Collection<SocketIOClient> clients = socketIOServer.getBroadcastOperations().getClients();
for (SocketIOClient clientByRoom : clients) {
clientByRoom.sendEvent("responseEvent", client.getSessionId().toString()+": "+message);
}
}
}
服务器启动代码如下所示。
@Component
@Order(1)
public class SocketServerRunner implements CommandLineRunner {
private static Logger logger = LoggerFactory.getLogger(SocketServerRunner.class);
@Resource
private SocketIOServer socketIOServer;
@Resource
private PubSubStore pubSubStore;
@Autowired
private RedissonClient redisson;
@Override
public void run(String... args) throws Exception {
logger.info("socketIOServer ");
socketIOServer.start();
pubSubStore.subscribe(PubSubType.DISPATCH, data -> {
Collection<SocketIOClient> clients = null;
String room = data.getRoom();
String namespace = data.getNamespace();
Packet packet = data.getPacket();
String jsonData = packet.getData();
if(!StringUtils.isEmpty(namespace)){
SocketIONamespace socketIONamespace = socketIOServer.getNamespace(namespace);
if(StringUtils.isEmpty(room)){
clients = socketIONamespace.getRoomOperations(room).getClients();
}
}else{
clients = socketIOServer.getBroadcastOperations().getClients();
}
if(!CollectionUtils.isEmpty(clients)){
for (SocketIOClient client : clients) {
client.sendEvent("messageEvent",jsonData);
}
}
}, DispatchMessage.class);
// addNameSpace(socketIOServer);
}
我在 OnConnect 注释方法上获得连接注册，但该方法似乎运行了两次，因为我在套接字连接时获得了两次日志。我不知道为什么会这样。
但更糟糕的是，用客户端 javascript 编写的 emit 方法不起作用。没有错误。 emit 下面的日志被执行了。但是 java EventHandler 中的 OnEvent 注释方法似乎没有检测到它。
谁能帮我理解一下？
最佳答案
显然问题似乎出在库上。较新版本的 socketio 客户端库与 java 的 netty 依赖关系存在一些兼容性问题，它导致了奇怪的问题。
我对 netty socketio 的依赖如下所示，这显然是回答这个问题的最新版本。
<dependency>
<groupId>com.corundumstudio.socketio</groupId>
<artifactId>netty-socketio</artifactId>
<version>1.7.19</version>
</dependency>
为了让客户端库顺利运行，我必须将库从 3.X.X 降级到 2.X.X。
以我为例
<script src="https://cdn.socket.io/3.1.3/socket.io.min.js" integrity="sha384-cPwlPLvBTa3sKAgddT6krw0cJat7egBga3DJepJyrLl4Q9/5WLra3rrnMcyTyOnh" crossorigin="anonymous"></script>
到
<script src="https://cdn.bootcss.com/socket.io/2.1.1/socket.io.js"></script>
关于java - socketio.emit 不起作用 netty socketio，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/68213997/