websocket使用

---使用
package com.gxhj.safecampus.configuration.datapush;

import com.gxhj.safecampus.configuration.sysconfig.CampusConfig;
import com.gxhj.safecampus.configuration.websocket.WebSocketServer;
import com.gxhj.safecampus.utils.common.HttpConnectionUtil;
import com.gxhj.safecampus.warning.vo.WarningVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**

• 信息推送对象
  */
  @Component
  public class DataPushBean {

  @Autowired
  private WebSocketServer webSocketServer;

  /**

  • 通过websocket推送黑名单预警信息至首页
  • @param groupId 组织ID
  • @param warningVo 预警信息
    */
    public void sendWarningPersonByWebSocket(String groupId, WarningVo warningVo) {
    webSocketServer.sendInfo(groupId, warningVo);
    }

  /**

  • 将提醒信息推送至微信端
  • @param message 提醒信息
  • @return {} 返回请求结果
    */
    public String sendMessageByWeChat(String message) {
    return HttpConnectionUtil.doPost(CampusConfig.getHoverParamConfig().getNoteInformUrl(), message);
    }

}

---

---Java配置类
package com.gxhj.safecampus.configuration.websocket;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

/**

• socket配置类,往 spring 容器中注入ServerEndpointExporter实例
  */
  @Configuration
  public class WebSocketConfig {

  @Bean
  public ServerEndpointExporter serverEndpointExporter() {
  return new ServerEndpointExporter();
  }
  }

---

---Java
package com.gxhj.safecampus.configuration.websocket;

import com.gxhj.safecampus.middleware.util.MiddlewareUtil;
import com.gxhj.core.exception.BusinessException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**

• WebSocket服务端代码，包含接收消息，推送消息等接口
  */
  @Component
  @ServerEndpoint(value = "/socket/{groupId}") // 只是用来标记这个类是websocket服务类
  public class WebSocketServer {

  private static final Logger log = LoggerFactory.getLogger(WebSocketServer.class);

  //用来存放每个客户端对应的WebSocketServer对象。
  private static Map<String, Session> sessionPools = new ConcurrentHashMap<>();

  /**

  • 发送消息方法
  • @param session 客户端与socket建立的会话
  • @param message 消息
  • @throws IOException
    */
    public void sendMessage(Session session, String message) throws IOException {
    if (session != null) {
    session.getBasicRemote().sendText(message);
    }
    }

/**
 * 连接建立成功调用
 *
 * @param session 客户端与socket建立的会话
 * @param groupId 客户端的groupId
 */
@OnOpen
public void onOpen(Session session, @PathParam(value = "groupId") String groupId) {
    sessionPools.put(groupId, session);
}

/**
 * 关闭连接时调用
 *
 * @param groupId 关闭连接的客户端的组织id
 */
@OnClose
public void onClose(@PathParam(value = "groupId") String groupId) {
    sessionPools.remove(groupId);
}

/**
 * 收到客户端消息时触发---可用于心跳检测
 *
 * @param message
 * @throws IOException
 */
@OnMessage
public void onMessage(Session session, String message) {
    try {
        sendMessage(session, message);
    } catch (Exception e) {
        log.error("websocket发送信息失败--发送心跳检测信息失败", e);
    }
}

/**
 * 发生错误时候
 *
 * @param session
 * @param throwable
 */
@OnError
public void onError(Session session, Throwable throwable) {
    System.out.println("发生错误");
    log.error("websocket发生错误", throwable);
}

/**
 * 给指定用户发送消息
 *
 * @param groupId 组织id
 * @param message 消息
 * @throws IOException
 */
public void sendInfo(String groupId, Object message) {
    //遍历所有websocket登录用户
    for (String key : sessionPools.keySet()) {
        //给所有该组织的用户发送消息
        if (key.startsWith(groupId)) {
            try {
                sendMessage(sessionPools.get(key), MiddlewareUtil.getSerialObjMapper().writeValueAsString(message));
            } catch (Exception e) {
                throw new BusinessException("websocket消息推送异常", e);
            }
        }
    }
}

}

---