2024-09-06



import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.config.annotation.*;
 
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/ws").withSockJS();
    }
 
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.enableSimpleBroker("/topic");
        registry.setApplicationDestinationPrefixes("/app");
    }
}

这段代码定义了一个配置类WebSocketConfig,实现了WebSocketMessageBrokerConfigurer接口,用于配置Spring Boot中的WebSocket支持。通过@EnableWebSocketMessageBroker注解启用了WebSocket消息代理。registerStompEndpoints方法注册了一个WebSocket端点,并指示其与SockJS协议兼容,以支持更好的浏览器兼容性。configureMessageBroker方法配置了消息代理的简单传输,并设置了应用程序的目的前缀。这样,前端应用程序就可以使用定义好的端点和前缀与后端进行实时通信。

2024-09-06

以下是一个简化的示例,展示如何在Spring Boot应用程序中使用WebSocket和WebRTC实现视频通话的基本框架。

  1. 添加依赖到pom.xml



<dependencies>
    <!-- Spring Boot WebSocket 依赖 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-websocket</artifactId>
    </dependency>
    <!-- WebRTC 客户端依赖(如果需要) -->
</dependencies>
  1. 配置WebSocket:



@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/topic");
        config.setApplicationDestinationPrefixes("/app");
    }
 
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/video-chat").withSockJS();
    }
}
  1. 创建WebSocket服务端点:



@Controller
public class VideoChatController {
 
    @MessageMapping("/video-chat")
    @SendTo("/topic/video-chat")
    public String processVideoChatMessage(String message) {
        // 转发消息到所有客户端
        return message;
    }
}
  1. 前端JavaScript代码(使用SockJS和WebRTC API):



const socket = new SockJS('/video-chat');
stompClient = Stomp.over(socket);
stompClient.connect({}, function(frame) {
    console.log('Connected: ' + frame);
    stompClient.subscribe('/topic/video-chat', function(videoChatMessage) {
        // 处理接收到的视频通话信息
    });
});
 
// WebRTC 信令过程(建立连接、交换SDP等)
const peerConnection = new RTCPeerConnection({...});
 
// 监听来自远端的视频流并将其附加到video标签
peerConnection.ontrack = function(event) {
    const remoteStream = event.streams[0];
    remoteVideo.srcObject = remoteStream;
};
 
// 添加本地视频流
const localStream = await navigator.mediaDevices.getUserMedia({video: true, audio: true});
localStream.getTracks().forEach(track => peerConnection.addTrack(track, localStream));
 
// WebRTC 信令服务
function sendMessage(message) {
    stompClient.send("/app/video-chat", {}, JSON.stringify(message));
}

以上代码提供了一个基本框架,展示了如何在Spring Boot应用程序中集成WebSocket和WebRTC来实现视频通话。实际应用中,你需要实现完整的WebRTC信令过程以及错误处理。

2024-09-06

在Spring Boot中集成WebSocket和SSH来连接SSH终端并记录日志涉及以下几个关键步骤:

  1. 使用Spring Boot的WebSocket支持创建一个WebSocket端点。
  2. 使用第三方库(如JSch)建立SSH连接。
  3. 在SSH连接上打开一个shell会话,并从会话中获取输入和输出流。
  4. 通过WebSocket发送输出流到客户端,并从客户端接收输入流。
  5. 记录所有日志以便将来分析。

以下是一个简化的例子:




import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.ChannelShell;
 
public class SshTerminalWebSocketHandler extends TextWebSocketHandler {
 
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        // 建立SSH连接
        JSch jsch = new JSch();
        Session sshSession = jsch.getSession("username", "host", 22);
        sshSession.setPassword("password");
        sshSession.setConfig("StrictHostKeyChecking", "no");
        sshSession.connect();
 
        // 打开一个shell会话
        ChannelShell channel = (ChannelShell) sshSession.openChannel("shell");
        channel.setPty(true);
        channel.setPtyType("vt100");
 
        // 获取输入和输出流
        InputStream in = channel.getInputStream();
        OutputStream out = channel.getOutputStream();
 
        // 启动线程来处理输出流(发送到WebSocket客户端)
        Thread outputThread = new Thread(() -> {
            try (in; WebSocketSession session) {
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = in.read(buffer)) != -1) {
                    // 发送到WebSocket客户端
                    session.sendMessage(new TextMessage(new String(buffer, 0, bytesRead)));
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        });
        outputThread.start();
 
        // 处理来自WebSocket客户端的输入
        while (true) {
            String message = ... // 从WebSocketSession接收消息
            out.write(message.getBytes());
        }
 
        // 记录日志
        // ...
 
        // 关闭资源
        channel.disconnect();
        sshSession.disconnect();
    }
 
    // 其他方法实现...
}

在这个例子中,我们创建了一个SshTerminalWebSocketHandler类,它继承自TextWebSocketHandler。在连接建立后,我们使用JSch库建立SSH连接,打开一个shell会话,并启动两个线程:一个用于读取输出流并通过WebSocket发送到客户端,另一个用于接收来自客户端的输入并将其写入输入流。同时,我们还需要实现其他必要的方法,如处理错误和关闭资源。

请注意,这只是一个简化的例子,实际应用中你需要处理异常、日志记录、资源管理和性能优化等方面。同时,你还需要配置Spring Boot的WebSocket支持,并确保JSch库已经包含在项目依赖中。

2024-09-06

以下是一个简化的Spring Boot集成WebSocket的例子,实现了消息的实时推送:




// 导入相关依赖的类
import org.springframework.stereotype.Component;
import org.springframework.web.socket.server.standard.SpringConfigurator;
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
 
// 使用@ServerEndpoint注解定义WebSocket endpoint
@ServerEndpoint(value = "/websocket", configurator = SpringConfigurator.class)
@Component
public class WebSocketServer {
 
    // 保存所有的WebSocket连接
    private static final CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<>();
 
    // 与某个客户端的连接会话
    private Session session;
 
    // 连接建立成功调用的方法
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.add(this);
    }
 
    // 连接关闭调用的方法
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
    }
 
    // 收到客户端消息后调用的方法
    @OnMessage
    public void onMessage(String message, Session session) {
        // 可以根据业务需求处理客户端发送的消息
    }
 
    // 出现错误时调用
    @OnError
    public void onError(Session session, Throwable error) {
        error.printStackTrace();
    }
 
    // 向所有客户端广播消息
    public void broadcast(String message) {
        webSocketSet.forEach(webSocket -> sendMessage(message));
    }
 
    // 服务端发送消息给客户端的方法
    private void sendMessage(String message) {
        try {
            this.session.getBasicRemote().sendText(message);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

在这个例子中,我们定义了一个WebSocket服务端点/websocket,并使用@ServerEndpoint@OnOpen@OnClose@OnMessage@OnError注解来处理WebSocket的不同生命周期事件。broadcast方法用于向所有连接的客户端发送消息。这个简单的例子展示了如何在Spring Boot应用程序中集成WebSocket,并实现服务端向客户端的消息推送。

2024-09-05



import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.handler.TextWebSocketHandler;
 
public class MyWebSocketHandler extends TextWebSocketHandler {
 
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        System.out.println("Connected ... " + session.getId());
    }
 
    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        System.out.println("Received message: " + message.getPayload());
        // 发送消息回客户端
        session.sendMessage(new TextMessage("Hello, client!"));
    }
 
    @Override
    public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
        System.out.println("Transport error " + session.getId() + ":" + exception.getMessage());
    }
 
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
        System.out.println("Connection closed " + session.getId());
    }
}

这段代码定义了一个MyWebSocketHandler类,它继承自TextWebSocketHandler。在这个类中,我们覆盖了四个方法:afterConnectionEstablishedhandleTextMessagehandleTransportErrorafterConnectionClosed。这些方法分别在WebSocket连接建立、接收消息、传输发生错误和连接关闭时被调用。在handleTextMessage方法中,我们接收到消息后,向客户端发送了一个问候消息。这个例子展示了如何在WebSocket连接中使用Spring Boot处理文本消息。

2024-09-05



import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.core.Authentication;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
 
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
 
    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableStompBrokerRelay("/topic")
              .setRelayHost("localhost")
              .setRelayPort(61613)
              .setClientLogin("guest")
              .setClientPasscode("guest");
        config.setApplicationDestinationPrefixes("/app");
        config.setUserDestinationPrefix("/user");
    }
 
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/ws").withSockJS();
    }
 
    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors(new ChannelInterceptor() {
            @Override
            public Message<?> preSend(Message<?> message, MessageChannel channel) {
                StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
                if (StompComm
2024-09-05

在Spring Boot中实现WebSocket功能,你可以使用Spring的@EnableWebSocketMessageBroker注解来配置一个WebSocket消息代理。以下是一个简单的例子:

  1. 添加Maven依赖:



<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
  1. 配置WebSocketMessageBroker:



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;
 
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
    
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/ws").withSockJS();
    }
 
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.enableSimpleBroker("/topic");
        registry.setApplicationDestinationPrefixes("/app");
    }
}
  1. 创建控制器来处理WebSocket消息:



import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
public class WebSocketController {
 
    @MessageMapping("/hello")
    @SendTo("/topic/greetings")
    public String greeting(String message) {
        return "Hello, " + message + "!";
    }
}
  1. 在前端使用WebSocket:



<script src="https://cdn.jsdelivr.net/npm/sockjs-client@1.7.0/dist/sockjs.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/stompjs@2.3.3/stomp.min.js"></script>
<script type="text/javascript">
    var socket = new WebSocket('ws://' + window.location.host + '/ws');
    var stompClient = Stomp.over(socket);
    stompClient.connect({}, function(frame) {
        console.log('Connected: ' + frame);
        stompClient.subscribe('/topic/gr
2024-09-05

在Django Channels中,WebSocket的工作原理如下:

  1. 用户通过HTTP请求连接到你的WebSocket服务。
  2. 服务器接收连接请求,建立WebSocket连接。
  3. 服务器和客户端之间可以双向发送消息。
  4. 连接可以在任何时候被任何一方关闭。

以下是一个简单的示例,展示了如何在Django Channels中使用WebSocket:




# consumers.py
 
from channels.generic.websocket import WebsocketConsumer
 
class ChatConsumer(WebsocketConsumer):
    def connect(self):
        # 当WebSocket连接建立时调用
        self.accept()
 
    def receive(self, text_data=None, bytes_data=None):
        # 当接收到消息时调用
        message = text_data
        # 对message进行处理,例如广播到所有连接的客户端
 
    def disconnect(self, close_code):
        # 当连接关闭时调用
        pass

在这个示例中,我们定义了一个名为ChatConsumer的WebSocket consumer类。当客户端连接到这个consumer时,connect方法被调用,并通过self.accept()来接受连接。当客户端发送消息时,receive方法被调用,并接收到的消息可以在这里处理。当连接关闭时,disconnect方法被调用。

routing.py中,你需要将这个consumer配置为可以处理WebSocket连接的路由:




# routing.py
 
from django.urls import path
from .consumers import ChatConsumer
 
websocket_urlpatterns = [
    path('ws/chat/', ChatConsumer.as_asgi()),
]

确保在你的Django项目中启用了Channels,并且正确配置了路由,这样你就可以在你的Django应用中使用WebSocket了。

2024-09-05



import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
 
@ServerEndpoint("/websocket")
public class WebSocketTest {
    private static final CopyOnWriteArraySet<Session> sessions = new CopyOnWriteArraySet<>();
 
    @OnOpen
    public void onOpen(Session session) {
        sessions.add(session);
        System.out.println("Connected ... " + session.getId());
    }
 
    @OnClose
    public void onClose(Session session) {
        sessions.remove(session);
        System.out.println("Disconnected ... " + session.getId());
    }
 
    @OnError
    public void onError(Session session, Throwable throwable) {
        System.out.println("Error ... " + session.getId());
        throwable.printStackTrace();
    }
 
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("Received message ... " + session.getId() + " " + message);
        for (Session peer : sessions) {
            if (!peer.equals(session)) {
                try {
                    peer.getBasicRemote().sendText(message);
                } catch (IOException e) {
                    onError(peer, e);
                }
            }
        }
    }
}

这段代码使用Java定义了一个简单的WebSocket服务端点,它可以处理多个客户端的连接,并将接收到的消息广播到所有其他的客户端。这个例子展示了如何使用Java EE的WebSocket API,并且如何处理连接、消息接收、错误以及关闭事件。

2024-09-05

以下是一个使用Spring Boot整合WebSocket的简单示例。

首先,添加依赖到你的pom.xml文件:




<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

然后,配置WebSocket:




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;
 
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
 
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/ws").withSockJS();
    }
 
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.enableSimpleBroker("/topic");
        registry.setApplicationDestinationPrefixes("/app");
    }
}

接下来,创建一个控制器来处理WebSocket消息:




import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
public class WebSocketController {
 
    @Autowired
    private SimpMessagingTemplate simpMessagingTemplate;
 
    @MessageMapping("/hello")
    @SendTo("/topic/greetings")
    public String greeting(String message) {
        return "Hello, " + message + "!";
    }
 
    @RequestMapping("/sendMessage")
    @ResponseBody
    public String sendMessage(String message) {
        simpMessagingTemplate.convertAndSend("/topic/greetings", "Hello, " + message + "!");
        return "Message sent";
    }
}

最后,在HTML页面中使用WebSocket:




<!DOCTYPE html>
<html>
<head>
    <title>WebSocket Test</title>
    <script src="https://cdn.jsdelivr.net/npm/sockjs-client@1.7.0/dist/sockjs.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/s