Spring Boot分布式系统实践【基础模块构建3.2】集成w

2019-03-19 本文已影响56人逸如风飞

添加依赖

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

注入ServerEndpointExporter

这个bean会自动注册使用了@ServerEndpoint注解声明的Websocket endpoint。

 package com.halburt.site.common.socket.config;

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

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

websocket实现

@ServerEndpoint(value = "/web/admin/anon/ws")
@Component
public class TestWebSocket {
    //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;
    // concurrent包的线程安全Set，用来存放每个客户端对应的ProductWebSocket对象。
    private static ConcurrentHashMap<String , TestWebSocket> webSocketSet = new ConcurrentHashMap<String ,TestWebSocket>();
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.put(session.getId() , this);
        try {
            session.getBasicRemote().sendText("sessionId="+session.getId());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(Session session) {
        webSocketSet.remove(session.getId());
    }

    /**
     * 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) throws IOException, EncodeException {
        session.getBasicRemote().sendText(JsonResult.success("来自客户端的消息:"+message).toJSONString());
        System.out.println("来自客户端的消息:" + message);

    }
    /**
     * 服务器端调用，发送消息
     * @param sessionId
     * @param message
     * @throws IOException
     */
    public static void sendMessage(String sessionId ,JSONObject message) throws IOException {
        Session s =  webSocketSet.get(sessionId).session;
        if(null != s){
            try {
                s.getBasicRemote().sendText(message.toString());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    /**
     * 发生错误时调用
     *
     * @OnError
     */
    public void onError(Session session, Throwable error) {
        System.out.println("发生错误");
        error.printStackTrace();
    }

}

注意

private static ConcurrentHashMap<String , TestWebSocket> webSocketSet = new ConcurrentHashMap<String ,TestWebSocket>();

javax.websocket.Session只会与当前连接的服务进行通信，无法与掐服务器连接。所以不用想着用分布式情况下，进行redis缓存session，单机情况下本地ConcurrentHashMap存储session。【分布式情况暂考虑使用redis发布订阅】

添加登录页面

   @GetMapping("/web/admin/anon/qrLogin")
    public String qrLogin() {

        return "ws/qrLogin.html";
    }

<html>
<head>
    <script src="//cdn.bootcss.com/jquery/3.1.1/jquery.min.js"></script>
    <script src="//cdn.bootcss.com/jquery.qrcode/1.0/jquery.qrcode.min.js"></script>
    <script>
         function create(url){
             console.info(url)
             $('#code').qrcode(url); //任意字符串

         }
    </script>
</head>
<body>
<div id="code"></div>
<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
    if('WebSocket' in window){
//此处替换为自己的IP
        websocket = new WebSocket("ws://localhost:9000/web/admin/anon/ws");
    }
    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:"+event.data);

    }

    //接收到消息的回调方法
    websocket.onmessage = function(event){
        setMessageInnerHTML(event.data);
        if(event.data.indexOf("sessionId=")== 0){
        //此处替换为自己的IP
            create("http://192.168.1.140/web/admin/anon/login2?"+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>

image.png

扫描

   @ResponseBody
    @GetMapping("/web/admin/anon/login2")
    public String login(Model model,String sessionId) {
        String userId = "1";//此处应该从扫描机器获取用户信息
        try {
            TestWebSocket.sendMessage(sessionId, JsonResult.success( "已经扫描"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        //此处应该跳转一个页面
        return "OK000";
    }

扫描之后确认登录

此处应该设计加密规则

   @ResponseBody
    @GetMapping("/web/admin/anon/logined")
    public String logined(Model model,String sessionId) {
        String userId = "1";//此处应该从扫描机器获取用户信息
        try {
            TestWebSocket. sendMessage(sessionId, JsonResult.success( UserUtils.getSysUserById(userId)));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "OK000";
    }