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91 lines
3.0 KiB
91 lines
3.0 KiB
package com.dc.web.websocket;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.stereotype.Component;
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import javax.websocket.*;
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import javax.websocket.server.PathParam;
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import javax.websocket.server.ServerEndpoint;
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import java.util.concurrent.Semaphore;
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/**
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* websocket 消息处理
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*
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* @author ruoyi
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*/
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@Slf4j
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@Component
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@ServerEndpoint("/websocket/{sessionId}")
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public class WebSocketServer {
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/**
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* 默认最多允许同时在线人数100
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*/
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public static int socketMaxOnlineCount = 100;
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private static Semaphore socketSemaphore = new Semaphore(socketMaxOnlineCount);
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/**
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* 连接建立成功调用的方法
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*/
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@OnOpen
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public void onOpen(Session session, @PathParam("sessionId") String sessionId) throws Exception {
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log.info("sessionId - {}", sessionId);
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boolean semaphoreFlag = false;
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// 尝试获取信号量
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semaphoreFlag = SemaphoreUtils.tryAcquire(socketSemaphore);
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if (!semaphoreFlag) {
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// 未获取到信号量
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log.error("\n 当前在线人数超过限制数- {}", socketMaxOnlineCount);
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WebSocketUsers.sendMessageToUserByText(session, "当前在线人数超过限制数：" + socketMaxOnlineCount);
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session.close();
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} else {
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// 添加用户
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WebSocketUsers.put(sessionId, session);
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log.info("\n 建立连接 - {}", session);
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log.info("\n 当前人数 - {}", WebSocketUsers.getUsers().size());
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WebSocketUsers.sendMessageToUserByText(session, "连接成功");
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}
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}
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/**
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* 连接关闭时处理
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*/
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@OnClose
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public void onClose(Session session) {
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log.info("\n 关闭连接 - {}", session);
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// 移除用户
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WebSocketUsers.remove(session.getId());
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// 获取到信号量则需释放
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SemaphoreUtils.release(socketSemaphore);
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}
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/**
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* 抛出异常时处理
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*/
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@OnError
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public void onError(Session session, Throwable exception) throws Exception {
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if (session.isOpen()) {
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// 关闭连接
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session.close();
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}
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String sessionId = session.getId();
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log.info("\n 连接异常 - {}", sessionId);
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log.info("\n 异常信息 - {}", exception);
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// 移出用户
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WebSocketUsers.remove(sessionId);
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// 获取到信号量则需释放
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SemaphoreUtils.release(socketSemaphore);
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}
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/**
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* 服务器接收到客户端消息时调用的方法
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* 自定义sessionId，每个设备不同的sessionId，这样就可以给每个设备发送消息了
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*/
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@OnMessage
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public void onMessage(String message, @PathParam("sessionId") String sessionId) {
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log.info("sessionId - {}", sessionId);
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String msg = message.replace("你", "我").replace("吗", "");
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WebSocketUsers.sendMessageToUserByText(WebSocketUsers.getUsers().get(sessionId), msg);
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}
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}
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