jsp websocket
时间: 2023-09-01 12:12:52 浏览: 52
JSP (JavaServer Pages) is a technology used to create dynamic web pages using Java. WebSocket is a protocol that enables two-way communication between a client and a server over a single TCP connection.
To use WebSocket in JSP, you need to follow these steps:
1. Create a WebSocket server in Java that implements the WebSocket protocol.
2. Create a JSP page that includes the WebSocket client code.
3. Open a WebSocket connection from the client to the server using the WebSocket API.
4. Send and receive messages between the client and server using the WebSocket API.
Here's some sample code for a WebSocket server in Java:
```
@ServerEndpoint("/chat")
public class ChatServer {
private static Set<Session> clients = Collections.synchronizedSet(new HashSet<Session>());
@OnMessage
public void onMessage(String message, Session session) throws IOException {
for (Session client : clients) {
if (!client.equals(session)) {
client.getBasicRemote().sendText(message);
}
}
}
@OnOpen
public void onOpen(Session session) {
clients.add(session);
}
@OnClose
public void onClose(Session session) {
clients.remove(session);
}
}
```
This code defines a WebSocket server that listens for messages on the "/chat" endpoint. When a message is received, it is broadcast to all connected clients except the sender.
To create a JSP page that includes the WebSocket client code, you can use the following code:
```
<%@ page import="javax.websocket.*, java.net.URI" %>
<script type="text/javascript">
var websocket = new WebSocket(new URI("ws://localhost:8080/myapp/chat"));
websocket.onmessage = function(event) {
console.log(event.data);
};
function sendMessage() {
var message = document.getElementById("message").value;
websocket.send(message);
}
</script>
<input type="text" id="message" />
<button onclick="sendMessage()">Send</button>
```
This code creates a WebSocket connection to the "/chat" endpoint and listens for incoming messages. When the user clicks the "Send" button, the message is sent to the server over the WebSocket connection.
Overall, using WebSocket in JSP requires setting up a WebSocket server in Java and including the WebSocket client code in a JSP page. Once the connection is established, messages can be sent and received between the client and server in real-time.
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