基于springboot的websocket的使用

1.添加websocket依赖

       
			org.springframework.boot
			spring-boot-starter-websocket
		

2.springboot的启动类注册bean

WebSocket配置类

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

3.websocket操作类：

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.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;

@ServerEndpoint(value = "/websocket/{id}")
@Component
public class Websocket{
    private static final Logger LOGGER = LoggerFactory.getLogger(Websocket.class);
    private static AtomicInteger onlineCount = new AtomicInteger(0);
    private static ConcurrentHashMap mesSessionMap = new ConcurrentHashMap<>();
    private static ConcurrentHashMap mesWebsocketMap = new ConcurrentHashMap<>();

    

    @OnOpen
    public void onOpen(@PathParam("id") String id, Session session) {
        onlineCount.incrementAndGet();
        mesSessionMap.put(id, session);
        mesWebsocketMap.put(id, this);
        LOGGER.info("有新连接加入：{}，当前在线人数为：{}", session.getId(), onlineCount.get());
    }

    
    @OnClose
    public void onClose(@PathParam("id") String id, Session session) {
        onlineCount.decrementAndGet();
        mesSessionMap.remove(id);
        mesWebsocketMap.remove(id);
        LOGGER.info("有一连接关闭：{}，当前在线人数为：{}", session.getId(), onlineCount.get());

    }

    
    @OnError
    public void onError(Session session, Throwable error) {
        LOGGER.error("发生错误", error);
        error.printStackTrace();
    }

    
    public void sendMessage(String id, String json) {
        Session session = mesSessionMap.get(id);
        if (session != null) {
            session.getAsyncRemote().sendText(json);
        }
    }

    public static Websocket getWebSockets(String id) {
        Websocket webSockets = mesWebsocketMap.get(id);
        return webSockets;
    }

    
    @OnMessage
    public void onMessage(@PathParam("id") String id, String test, Session session) {
        System.out.println("来自客户端的消息：" + id + ";" + test);
        mesWebsocketMap.get(id).sendMessage(id, "json");
    }



}

4.nginx支撑websocket配置，其中ip和port为自身的微服务ip和端口。（若该服务中又权限控制，做路劲过滤。）

            location /api/websocket/ {
                        proxy_pass http://ip:port/;
                        proxy_http_version  1.1;
                        proxy_set_header Upgrade websocket;
                        proxy_set_header Connection upgrade;
                        proxy_connect_timeout 75; 
                        proxy_read_timeout 1800s;
                        proxy_send_timeout 1800s;
                              add_header 'Access-Control-Allow-Origin' '$http_origin' always;
            add_header 'Access-Control-Allow-Credentials' 'true' always;
            add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE' always;
            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range' always;
            add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range' always;

            if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Allow-Origin' '$http_origin' always;
                add_header 'Access-Control-Allow-Credentials' 'true' always;
                add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE' always;
                add_header 'Access-Control-Allow-Headers' 'Pragma,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range' always;
                add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range' always;
                add_header 'Access-Control-Max-Age' '1728000' always;
                add_header 'Content-Type' 'text/plain; charset=utf-8' always;
                add_header 'Content-Length' 0 always;
                return 204;
            }
                }

5.1测试如下：测试工具为Apipost

建立连接如图：

 5.2测试发送接口（对接websocket的onMessage接口）