我正在尝试使用 Java Web 应用程序实现简单的 WebSocket 程序。
但是，无法在客户端和服务器之间建立通信。
有人可以帮我吗？
网络服务器:Tomcat
客户端代码: jsp/javascrip
<body>
<div>
<input type="text" value="" id="message" /> <br /> <input
type="submit" value="Start" onclick="start()" />
</div>
<div id="messages"></div>
<script type="text/javascript">
var webSocket;
var uri = 'ws://' + window.location.host + '/ZebraHosting/testwebsocket';
alert('ur url is ' + uri);
function connect() {
if ('WebSocket' in window) {
alert('I am in Websocket in window');
websocket = new WebSocket(uri);
} else if ('MozWebSocket' in window) {
websocket = new MozWebSocket(uri);
alert('I am in MozWebsocket in window');
} else {
alert('WebSocket is not supported by this browser.');
return;
}
webSocket.onerror = function(event) {
alert('I am onerror');
onError(event);
};
webSocket.onopen = function(event) {
alert('I am onopen');
onOpen(event);
};
webSocket.onmessage = function(event) {
alert('I am onmessage');
onMessage(event);
};
webSocket.onclose = function(event) {
alert('I am onclose');
onClose(event);
};
}
function onMessage(event) {
document.getElementById('messages').innerHTML += '<br />'
+ event.data;
}
function onOpen(event) {
alert("function onOpen " );
document.getElementById('messages').innerHTML = 'Connection established';
}
function onError(event) {
alert("Error ocurred " );
}
function start() {
alert("function start " );
webSocket.send(document.getElementById('message').value);
return false;
}
function onClose(event) {
alert("function onClose" );
document.getElementById('messages').innerHTML = 'Connection closed';
}
connect();
</script>
服务器代码:
import java.io.IOException;
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
@ServerEndpoint("/testwebsocket")
public class WebSocketTest {
@OnMessage
public void onMessage(String message, Session session) throws IOException, InterruptedException {
// Print the client message for testing purposes
System.out.println("Received: " + message);
// Send the first message to the client
session.getBasicRemote().sendText("replay from server for :" + message);
}
@OnOpen
public void onOpen() {
System.out.println("Client connected");
}
@OnClose
public void onClose() {
System.out.println("Connection closed");
}}
最佳答案
您的代码中有拼写错误:您创建了 WebSocket 对象并将其分配给变量 websocket，但后来使用了变量 webSocket。
关于java - Java 中的 WebSocket 编程 : client server communication issue，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35433324/