webSocket 入门demo

最新推荐文章于 2025-08-06 23:34:35 发布

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最新推荐文章于 2025-08-06 23:34:35 发布

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文章标签：网络 python java

原文链接：https://my.oschina.net/sphl520/blog/398376

本文介绍了一个使用Java实现的WebSocket服务端示例，该示例通过注解定义了WebSocket的路径，并实现了消息接收、发送及连接关闭等基本功能。此外，还提供了一个简单的HTML页面用于前端测试。

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java:

package webSocket;

import javax.websocket.OnClose;

import javax.websocket.OnMessage;

import javax.websocket.OnOpen;

import javax.websocket.Session;

import javax.websocket.server.PathParam;

import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/websocket/{user}")

public class WebSocketTest {

@OnMessage

public void onMessage(String message, Session session,@PathParam(value = "user")String user){

try {

System.err.println("session.getRequestParameterMap()>>"+session.getRequestParameterMap());

System.err.println("user>>>>>>>>>>>>>>>>"+user);

// Print the client message for testing purposes

System.out.println("Received: " + message);

// Send the first message to the client

session.getBasicRemote().sendText("This is the first server message");

// Send 3 messages to the client every 5 seconds

int sentMessages = 0;

while (sentMessages < 30) {

Thread.sleep(5000);

session.getBasicRemote().sendText("This is an intermediate server message. Count: " + sentMessages++);

}

// Send a final message to the client

session.getBasicRemote().sendText("This is the last server message");

} catch (Exception e) {

e.printStackTrace();

}

@OnOpen

public void onOpen() {

System.out.println("Client connected");

}

@OnClose

public void onClose() {

System.out.println("Connection closed");

}

备注：

1、上面这种方式类似于servlet，不需要main方法，只需要url中写明就可以访问到

2、上面中的引入类我这里是tomcat7提供的，而不是java7 引入的

新建一个html页面，从前端发送请求

<!DOCTYPE html>
<html>
<head>
<title>Testing websockets</title>
</head>
<body>
<div>
<input type="submit" value="Start" onclick="start()" />
</div>
<div id="messages"></div>
<script type="text/javascript">
var webSocket = new WebSocket('ws://localhost:8080/a/websocket');
webSocket.onerror = function(event) {
onError(event)
};
webSocket.onopen = function(event) {
onOpen(event)
};
webSocket.onmessage = function(event) {
onMessage(event)
};
function onMessage(event) {
document.getElementById('messages').innerHTML
+= '<br />' + event.data;
}
function onOpen(event) {
document.getElementById('messages').innerHTML
= 'Connection established';
}
function onError(event) {
alert(event.data);
alert("error");
}
function start() {
webSocket.send('hello');
return false;
}
</script>
</body>
</html>

IE是要在IE10才支持，websocket是 HTML5的一个新特性。

转载于:https://my.oschina.net/sphl520/blog/398376