springboot整合websocket

pom文件引入包

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

配置文件application.properties

server.port=9886
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.mode=LEGACYHTML5
spring.thymeleaf.suffix=.html
spring.thymeleaf.cache=false

WebSocketConfig

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

/**
 * 开启WebSocket支持
 * @author zhengkai
 */
@Configuration  
public class WebSocketConfig {  
	
    @Bean  
    public ServerEndpointExporter serverEndpointExporter() {  
        return new ServerEndpointExporter();  
    }  
  
} 

WebSocketServer

import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import org.springframework.stereotype.Component;
import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;
import lombok.extern.slf4j.Slf4j;


@ServerEndpoint("/websocket/{sid}")
@Component
public class WebSocketServer {
	
	static Log log=LogFactory.get(WebSocketServer.class);
    //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;
    //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;
        webSocketSet.add(this);     //加入set中
        addOnlineCount();           //在线数加1
        log.info("有新窗口开始监听:"+sid+",当前在线人数为" + getOnlineCount());
        this.sid=sid;
        try {
        	 sendMessage("连接成功");
        } catch (IOException e) {
            log.error("websocket 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
        log.info("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) {
    	log.info("收到来自窗口"+sid+"的信息:"+message);
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

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


    /**
     * 群发自定义消息
     * */
    public static void sendInfo(String message,@PathParam("sid") String sid) throws IOException {
    	log.info("推送消息到窗口"+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 e) {
                continue;
            }
        }
    }

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

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

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

消息推送

@Controller
@RequestMapping("/checkcenter")
public class CheckCenterController {

	//页面请求
	@GetMapping("/socket/{cid}")
	public ModelAndView socket(@PathVariable String cid) {
		ModelAndView mav=new ModelAndView("/socket");
		mav.addObject("cid", cid);
		return mav;
	}
	//推送数据接口
	@ResponseBody
	@RequestMapping("/socket/push/{cid}")
	public ApiReturnObject pushToWeb(@PathVariable String cid,String message) {  
		try {
			WebSocketServer.sendInfo(message,cid);
		} catch (IOException e) {
			e.printStackTrace();
			return ApiReturnUtil.error(cid+"#"+e.getMessage());
		}  
		return ApiReturnUtil.success(cid);
	} 
} 

页面发起socket请求

<script> 
    var socket;  
    if(typeof(WebSocket) == "undefined") {  
        console.log("您的浏览器不支持WebSocket");  
    }else{  
        console.log("您的浏览器支持WebSocket");  
        	//实现化WebSocket对象，指定要连接的服务器地址与端口  建立连接   
            socket = new WebSocket("https://localhost:9886/websocket/20".replace("https","ws"));  
            //打开事件  
            socket.onopen = function() {  
                console.log("Socket 已打开");  
                //socket.send("这是来自客户端的消息" + location.href + new Date());  
            };  
            //获得消息事件  
            socket.onmessage = function(msg) {  
                console.log(msg.data);  
                //发现消息进入    开始处理前端触发逻辑
            };  
            //关闭事件  
            socket.onclose = function() {  
                console.log("Socket已关闭");  
            };  
            //发生了错误事件  
            socket.onerror = function() {  
                alert("Socket发生了错误");  
                //此时可以尝试刷新页面
            }  
            //离开页面时，关闭socket
            //jquery1.8中已经被废弃，3.0中已经移除
            // $(window).unload(function(){  
            //     socket.close();  
            //});  
    }
    </script> 

测试
打开页面
https://localhost:9886/checkcenter/socket/20

postman get方式发送消息
https://localhost:9886/checkcenter/socket/push/20?message=“hello”

工具类：
ApiReturnObject

import java.io.Serializable;

public class ApiReturnObject implements Serializable{

	private static final long serialVersionUID = 1L;

	String errorCode="00";
	Object errorMessage;
	Object returnObject;
	
	
	public ApiReturnObject(String errorCode, Object errorMessage, Object returnObject) {
		super();
		this.errorCode = errorCode;
		this.errorMessage = errorMessage;
		this.returnObject = returnObject;
	}
	public ApiReturnObject(Object errorMessage, Object returnObject) {
		super();
		this.errorMessage = errorMessage;
		this.returnObject = returnObject;
	}
	public ApiReturnObject(Object returnObject) {
		super();
		this.returnObject = returnObject;
	}
	public String getErrorCode() {
		return errorCode;
	}

	public void setErrorCode(String errorCode) {
		this.errorCode = errorCode;
	}

	public Object getErrorMessage() {
		return errorMessage;
	}

	public void setErrorMessage(Object errorMessage) {
		this.errorMessage = errorMessage;
	}

	public Object getReturnObject() {
		return returnObject;
	}

	public void setReturnObject(Object returnObject) {
		this.returnObject = returnObject;
	}

}

ApiReturnUtil

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class ApiReturnUtil implements Serializable{

	private static final long serialVersionUID = 1L;
	
	public static ApiReturnObject error(Object errorMessage) {
		System.out.println(errorMessage);
		List<Object> object=new ArrayList<Object>();
		return new ApiReturnObject("01",errorMessage,object);
	}
	public static ApiReturnObject error(Object errorMessage, Object returnObject) {
		List<Object> object=new ArrayList<Object>();
		object.add(returnObject);
		return new ApiReturnObject("01",errorMessage,object);
	}
	public static ApiReturnObject success(Object returnObject) {
		if(returnObject instanceof java.util.List){
			return new ApiReturnObject("00","success",returnObject);
		}else {
			List<Object> object=new ArrayList<Object>();
			object.add(returnObject);
			return new ApiReturnObject("00","success",object);
		}
	}
	public static ApiReturnObject success(Object errorMessage, Object returnObject) {
		if(returnObject instanceof java.util.List){
			return new ApiReturnObject("00",errorMessage,returnObject);
		}else {
			List<Object> object=new ArrayList<Object>();
			object.add(returnObject);
			return new ApiReturnObject("00",errorMessage,object);
		}
	}

}

BasePath

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

public class BasePath {
	protected static String contextPath = null;
	protected static String basePath = null; 
	protected static String realPath = null;
	
	public static String getBasePath(HttpServletRequest request) {
		contextPath = request.getContextPath();
		basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+contextPath+"/";
		return basePath;
	}
	
	public static String getRealPath(HttpServletRequest request, String path) {
		ServletContext context = request.getSession().getServletContext();
		realPath = context.getRealPath(path);
		realPath = context.getRealPath(path)+"\\";
		return realPath;
	}
	
	public static String getMyRealPath(HttpServletRequest request, String path) {
		ServletContext context = request.getSession().getServletContext();
		realPath = context.getRealPath(path);
		realPath = context.getRealPath(path);
		return realPath;
	}
}

本章属于学习后自总结，原文章参考：https://blog.csdn.net/moshowgame/article/details/80017979