spring-boot集成web-socket

1、添加依赖

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

2、配置socket

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

@Configuration
public class WebSocketConfig {

    /**
     * 注入一个ServerEndpointExporter,该Bean会自动注册使用@ServerEndpoint注解申明的websocket endpoint
     */
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }

}

import com.google.gson.Gson;
import com.zyh.socket.bean.MyMessage;
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.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * 前后端交互的类实现消息的接收推送(自己发送给另一个人)
 *
 * @ServerEndpoint(value = "/test/oneToOne") 前端通过此URI 和后端交互，建立连接
 */
@Slf4j
@ServerEndpoint(value = "/test/oneToOne/{cid}")
@Component
public class OneToOneWebSocket {

    /** 记录当前在线连接数 */
    private static AtomicInteger onlineCount = new AtomicInteger(0);

    /** 存放所有在线的客户端 */
    /**      key:cid;value:session     **/
    private static Map<String, Session> clients = new ConcurrentHashMap<>();
    /**      key:session.id;value:cid    **/
    private static Map<String, String> SESSIONID_CLIENTID_MAP = new ConcurrentHashMap<>();

    private static Gson gson=new Gson();

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session,@PathParam("cid") String cid) {

        clients.put(cid, session);
        SESSIONID_CLIENTID_MAP.put(session.getId(), cid);

        onlineCount.incrementAndGet(); // 在线数加1

        log.info("有新连接加入：{}，当前在线人数为：{}", session.getId(), onlineCount.get());
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(Session session) {

        String cid = SESSIONID_CLIENTID_MAP.get(session.getId());
        clients.remove(cid);
        SESSIONID_CLIENTID_MAP.remove(session.getId());

        onlineCount.decrementAndGet(); // 在线数减1

        log.info("有一连接关闭：{}，当前在线人数为：{}", session.getId(), onlineCount.get());
    }

    /**
     * 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("服务端收到客户端[{}]的消息[{}]", session.getId(), message);
        try {
            MyMessage myMessage = gson.fromJson(message, MyMessage.class);
            if (myMessage != null) {
                Session toSession = clients.get(myMessage.getToUserId());
                if (toSession != null) {
                    this.sendMessage(myMessage.getMessage(), toSession);
                }
            }
        } catch (Exception e) {
            log.error("解析失败：{}", e);
        }

        this.sendMessage("已发出", session);
    }

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

    /**
     * 服务端发送消息给客户端
     */
    private void sendMessage(String message, Session toSession) {
        try {
            log.info("服务端给客户端[{}]发送消息[{}]", toSession.getId(), message);
            toSession.getBasicRemote().sendText(message);
        } catch (Exception e) {
            log.error("服务端发送消息给客户端失败：{}", e);
        }
    }

}

import lombok.Data;

import java.io.Serializable;

@Data
public class MyMessage implements Serializable {

    private String toUserId;

    private String message;

}

3、创建两个controller

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class IndexController {

    @RequestMapping("/")
    public String index(){
        return "/index";
    }

}

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class Index2Controller {

    @RequestMapping("/index2")
    public String index(){
        return "/index2";
    }

}

4、页面

<!DOCTYPE HTML>
<html>
<head>
    <title>My WebSocket</title>
</head>

<body>
<input id="text" type="text" />
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message"></div>
</body>

<script type="text/javascript">
    var websocket = null;

    //判断当前浏览器是否支持WebSocket, 主要此处要更换为自己的地址
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://localhost:9999/test/oneToOne/index2");
    } else {
        alert('Not support websocket')
    }

    //连接发生错误的回调方法
    websocket.onerror = function() {
        setMessageInnerHTML("error");
    };

    //连接成功建立的回调方法
    websocket.onopen = function(event) {
        //setMessageInnerHTML("open");
    }

    //接收到消息的回调方法
    websocket.onmessage = function(event) {
        setMessageInnerHTML(event.data);
    }

    //连接关闭的回调方法
    websocket.onclose = function() {
        setMessageInnerHTML("close");
    }

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function() {
        websocket.close();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket() {
        websocket.close();
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>

5、测试

准备两个数据包：

{ "toUserId":"index2", "message":"娘，妈的，终于找到你了" }
{ "toUserId":"index1", "message":"哈哈，是我呀，老伙计" }

发送：

7、源码链接

链接：https://pan.baidu.com/s/15-o5IkTmglYVcJqlMKKx2w 
提取码：27b0