java websocket聊天室示例(springboot)

【实例截图】

【核心代码】

package com.example.demo;

import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ConcurrentHashMap;

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;

import org.springframework.stereotype.Component;

import net.sf.json.JSONObject;

@ServerEndpoint(value = "/websocket/{userno}")
@Component
public class MyWebSocket {
    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;
    private static SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
   // private static CopyOnWriteArraySet<MyWebSocket> webSocketSet = new CopyOnWriteArraySet<MyWebSocket>();
  //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。若要实现服务端与单一客户端通信的话，可以使用Map来存放，其中Key可以为用户标识
    private static ConcurrentHashMap<String, MyWebSocket> webSocketSet = new ConcurrentHashMap<String, MyWebSocket>();
    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
  //当前发消息的人员编号
    private String userno = "";

    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(@PathParam(value = "userno") String param,Session session) {
    	 System.out.println(param);
         userno = param;//接收到发送消息的人员编号
         this.session = session;
         addOnlineCount();
         webSocketSet.put(param, this);//加入map中
        System.out.println("有新连接加入！当前在线人数为"   getOnlineCount());
        String nickname="{'nickname':'" param "','content':'上线'}";
        JSONObject obj = JSONObject.fromObject(nickname);
        try {
            sendMessage(obj "");
        } catch (IOException e) {
            System.out.println("IO异常");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
        subOnlineCount();           //在线数减1
        System.out.println("有一连接关闭！当前在线人数为"   getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("来自客户端的消息:"   message);
        System.out.println("来自客户端的消息:"   message);
//      session.get
        sendToUser(message);
      //群发消息
     /* if (1 < 2) {
          sendAll(message);
      } else {
          //给指定的人发消息
          sendToUser(message);
      }*/
    }
    /**
     * 给指定的人发送消息
     * @param message
     */
    private void sendToUser(String message) {
       // String sendUserno = message.split("[|]")[1];
       // String sendMessage = message.split("[|]")[0];
    	JSONObject obj = JSONObject.fromObject(message);
		obj.put("date", df.format(new Date()));
        String now = getNowTime();
        try {
        	Object object2 = obj.get("nickname2");
            if (webSocketSet.get(obj.get("nickname")) != null) {
            	obj.put("isSelf", false);
            	Object object = obj.get("content");
                webSocketSet.get(obj.get("nickname")).sendMessage(obj.toString());
            }
            if(webSocketSet.get(object2) != null){
                    obj.put("isSelf", true);
                    Object object = obj.get("content");
                    webSocketSet.get(obj.get("nickname2")).sendMessage(obj.toString());

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 给所有人发消息
     * @param message
     */
    private void sendAll(String message) {
        String now = getNowTime();
        String sendMessage = message.split("[|]")[0];
        //遍历HashMap
        for (String key : webSocketSet.keySet()) {
            try {
                //判断接收用户是否是当前发消息的用户
                if (userno.equals(key)) {
                    webSocketSet.get(key).sendMessage(now   "用户"   userno   "发来消息："   " <br/> "   sendMessage);
                    System.out.println("key = "   key);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    /**
     * 获取当前时间
     *
     * @return
     */
    private String getNowTime() {
        Date date = new Date();
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String time = format.format(date);
        return time;
    }
    public void sendMessage(String message) throws IOException{
    	      this.session.getBasicRemote().sendText(message);
    	         //this.session.getAsyncRemote().sendText(message);
    	    }

	/**
     * 发生错误时调用
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("发生错误");
        error.printStackTrace();
    }


    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
        //this.session.getAsyncRemote().sendText(message);
    }


    /**
     * 群发自定义消息
     * */
    public static void sendInfo(String message) throws IOException {
       
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        MyWebSocket.onlineCount  ;
    }

    public static synchronized void subOnlineCount() {
        MyWebSocket.onlineCount--;
    }
}