springboot框架快速整合websocket

1、【pom.xml】

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

2、【MsgType.java】

/**
 * @author JHL
 * 2019-08-10 9:56
 */
public enum MsgType {
    /** 连接 */
    CONNECT,
    /** 关闭 */
    CLOSE,
    /** 信息 */
    INFO,
    /** 错误 */
    ERROR
}

3、【SocketMsg.java】

import lombok.Data;

/**
* @author JHL
*   2019-08-10 9:55
*/
@Data
public class SocketMsg {
    private String msg;
    private MsgType msgType;

    public SocketMsg(String msg, MsgType msgType) {
        this.msg = msg;
        this.msgType = msgType;
    }
}

4、【WebSocketServer.java】

import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
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.Objects;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @author JHL
 * 2019-08-10 15:46
 */
@ServerEndpoint("/webSocket/{sid}")
@Slf4j
@Component
public class WebSocketServer {

    /**
    * 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<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

    /**
    * 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;

    /**
    * 接收sid
    */
    private String sid="";
    /**
    * 连接建立成功调用的方法
    * */
    @OnOpen
    public void onOpen(Session session,@PathParam("sid") String sid) {
        this.session = session;
        //如果存在就先删除一个，防止重复推送消息
        for (WebSocketServer webSocket:webSocketSet) {
            if (webSocket.sid.equals(sid)) {
                webSocketSet.remove(webSocket);
            }
        }
        webSocketSet.add(this);
        this.sid=sid;
    }

    /**
    * 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
    * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("收到来"+sid+"的信息:"+message);
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                log.error(e.getMessage(),e);
            }
        }
    }

    @OnError
    public void one rror(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }
    /**
    * 实现服务器主动推送
    */
    private void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
    * 群发自定义消息
    * */
    public static void sendInfo(SocketMsg socketMsg,@PathParam("sid") String sid) throws IOException {
        String message = JSONObject.toJSONString(socketMsg);
        log.info("推送消息到"+sid+"，推送内容:"+message);
        for (WebSocketServer item : webSocketSet) {
            try {
                //这里可以设定只推送给这个sid的，为null则全部推送
                if(sid==null) {
                    item.sendMessage(message);
                }else if(item.sid.equals(sid)){
                    item.sendMessage(message);
                }
            } catch (IOException ignored) { }
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        WebSocketServer that = (WebSocketServer) o;
        return Objects.equals(session, that.session) &&
            Objects.equals(sid, that.sid);
    }

    @Override
    public int hashCode() {
        return Objects.hash(session, sid);
    }
}

5、【使用】

WebSocketServer.sendInfo(new SocketMsg("Hello World!", MsgType.INFO), null);