服务器之家

服务器之家 > 正文

Spring boot项目整合WebSocket方法

时间:2022-01-07 12:50     来源/作者:灡亾

WebSocket是一种在单个TCP连接上进行全双工通信的协议。WebSocket通信协议于2011年被IETF定为标准RFC 6455,并由RFC7936补充规范。WebSocket API也被W3C定为标准。WebSocket使得客户端和服务器之间的数据交换变得更加简单,允许服务端主动向客户端推送数据。在WebSocket API中,浏览器和服务器只需要完成一次握手,两者之间就直接可以创建持久性的连接,并进行双向数据传输。

springboot对websocket支持很友好,只需要继承webSocketHandler类,重写几个方法就可以了

这个类是对消息的一些处理,比如是发给一个人,还是发给所有人,并且前端连接时触发的一些动作

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/**
 * 创建一个WebSocket server
 *
 * @ClassName: CustomWebSocketHandler
 * @Description: TODO
 * @author OnlyMate
 * @Date 2018年8月16日 下午3:17:34
 *
 */
@Service
public class CustomWebSocketHandler extends TextWebSocketHandler implements WebSocketHandler {
    private Logger logger = LoggerFactory.getLogger(CustomWebSocketHandler.class);
    // 在线用户列表
    private static final Map<String, WebSocketSession> users;
    // 用户标识
    private static final aString CLIENT_ID = "mchNo";
 
    static {
        users = new HashMap<>();
    }
 
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        logger.info("成功建立websocket-spring连接");
        String mchNo = getMchNo(session);
        if (StringUtils.isNotEmpty(mchNo)) {
            users.put(mchNo, session);
            session.sendMessage(new TextMessage("成功建立websocket-spring连接"));
            logger.info("用户标识:{},Session:{}", mchNo, session.toString());
        }
    }
 
    @Override
    public void handleTextMessage(WebSocketSession session, TextMessage message) {
        logger.info("收到客户端消息:{}", message.getPayload());
        JSONObject msgJson = JSONObject.parseObject(message.getPayload());
        String to = msgJson.getString("to");
        String msg = msgJson.getString("msg");
        WebSocketMessage<?> webSocketMessageServer = new TextMessage("server:" +message);
        try {
            session.sendMessage(webSocketMessageServer);
            if("all".equals(to.toLowerCase())) {
                sendMessageToAllUsers(new TextMessage(getMchNo(session) + ":" +msg));
            }else {
                sendMessageToUser(to, new TextMessage(getMchNo(session) + ":" +msg));
            }
        } catch (IOException e) {
            logger.info("handleTextMessage method error:{}", e);
        }
    }
 
    @Override
    public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
        if (session.isOpen()) {
            session.close();
        }
        logger.info("连接出错");
        users.remove(getMchNo(session));
    }
 
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        logger.info("连接已关闭:" + status);
        users.remove(getMchNo(session));
    }
 
    @Override
    public boolean supportsPartialMessages() {
        return false;
    }
 
    public void sendMessage(String jsonData) {
        logger.info("收到客户端消息sendMessage:{}", jsonData);
        JSONObject msgJson = JSONObject.parseObject(jsonData);
        String mchNo = StringUtils.isEmpty(msgJson.getString(CLIENT_ID)) ? "陌生人" : msgJson.getString(CLIENT_ID);
        String to = msgJson.getString("to");
        String msg = msgJson.getString("msg");
        if("all".equals(to.toLowerCase())) {
            sendMessageToAllUsers(new TextMessage(mchNo + ":" +msg));
        }else {
            sendMessageToUser(to, new TextMessage(mchNo + ":" +msg));
        }
    }
    
    /**
     * 发送信息给指定用户
     * @Title: sendMessageToUser
     * @Description: TODO
     * @Date 2018年8月21日 上午11:01:08
     * @author OnlyMate
     * @param mchNo
     * @param message
     * @return
     */
    public boolean sendMessageToUser(String mchNo, TextMessage message) {
        if (users.get(mchNo) == null)
            return false;
        WebSocketSession session = users.get(mchNo);
        logger.info("sendMessage:{} ,msg:{}", session, message.getPayload());
        if (!session.isOpen()) {
            logger.info("客户端:{},已断开连接,发送消息失败", mchNo);
            return false;
        }
        try {
            session.sendMessage(message);
        } catch (IOException e) {
            logger.info("sendMessageToUser method error:{}", e);
            return false;
        }
        return true;
    }
 
    /**
     * 广播信息
     * @Title: sendMessageToAllUsers
     * @Description: TODO
     * @Date 2018年8月21日 上午11:01:14
     * @author OnlyMate
     * @param message
     * @return
     */
    public boolean sendMessageToAllUsers(TextMessage message) {
        boolean allSendSuccess = true;
        Set<String> mchNos = users.keySet();
        WebSocketSession session = null;
        for (String mchNo : mchNos) {
            try {
                session = users.get(mchNo);
                if (session.isOpen()) {
                    session.sendMessage(message);
                }else {
                    logger.info("客户端:{},已断开连接,发送消息失败", mchNo);
                }
            } catch (IOException e) {
                logger.info("sendMessageToAllUsers method error:{}", e);
                allSendSuccess = false;
            }
        }
 
        return allSendSuccess;
    }
    
    /**
     * 获取用户标识
     * @Title: getMchNo
     * @Description: TODO
     * @Date 2018年8月21日 上午11:01:01
     * @author OnlyMate
     * @param session
     * @return
     */
    private String getMchNo(WebSocketSession session) {
        try {
            String mchNo = session.getAttributes().get(CLIENT_ID).toString();
            return mchNo;
        } catch (Exception e) {
            return null;
        }
    }
}

这个类的作用就是在连接成功前和成功后增加一些额外的功能

我们希望能够把websocketSession和httpsession对应起来,这样就能根据当前不同的session,定向对websocketSession进行数据返回;在查询资料之后,发现spring中有一个拦截器接口,HandshakeInterceptor,可以实现这个接口,来拦截握手过程,向其中添加属性

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
/**
 * WebSocket握手时的拦截器
 * @ClassName: CustomWebSocketInterceptor
 * @Description: TODO
 * @author OnlyMate
 * @Date 2018年8月16日 下午3:17:04 
 *
 */
public class CustomWebSocketInterceptor implements HandshakeInterceptor {
    private Logger logger = LoggerFactory.getLogger(CustomWebSocketInterceptor.class);
    /**
     * 关联HeepSession和WebSocketSession,
     * beforeHandShake方法中的Map参数 就是对应websocketSession里的属性
     */
    @Override
    public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler handler, Map<String, Object> map) throws Exception {
        if (request instanceof ServletServerHttpRequest) {
            logger.info("*****beforeHandshake******");
            HttpServletRequest httpServletRequest = ((ServletServerHttpRequest) request).getServletRequest();
            HttpSession session = httpServletRequest.getSession(true);
            
            logger.info("mchNo:{}", httpServletRequest.getParameter("mchNo"));
            if (session != null) {
                
                map.put("sessionId",session.getId());
                map.put("mchNo", httpServletRequest.getParameter("mchNo"));
            }
        }
        return true;
    }
 
    @Override
    public void afterHandshake(ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Exception e) {
        logger.info("******afterHandshake******");
    }
}

这个类是配置类向Spring中注入handler

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
/**
 * websocket的配置类
 * @ClassName: CustomWebSocketConfig
 * @Description: TODO
 * @author OnlyMate
 * @Date 2018年8月16日 下午3:17:26 
 *
 */
@Configuration
@EnableWebSocket
public class CustomWebSocketConfig implements WebSocketConfigurer {
 
    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(customWebSocketHandler(), "/webSocketBySpring/customWebSocketHandler").addInterceptors(new CustomWebSocketInterceptor()).setAllowedOrigins("*");
        registry.addHandler(customWebSocketHandler(), "/sockjs/webSocketBySpring/customWebSocketHandler").addInterceptors(new CustomWebSocketInterceptor()).setAllowedOrigins("*").withSockJS();
    }
 
    @Bean
    public WebSocketHandler customWebSocketHandler() {
        return new CustomWebSocketHandler();
    }
}

补充说明:

setAllowedOrigins("*")一定要加上,不然只有访问localhost,其他的不予许访问

setAllowedOrigins(String[] domains),允许指定的域名或IP(含端口号)建立长连接,如果只允许自家域名访问,这里轻松设置。如果不限时使用"*"号,如果指定了域名,则必须要以http或https开头

经查阅官方文档springwebsocket 4.1.5版本前默认支持跨域访问,之后的版本默认不支持跨域,需要设置

使用withSockJS()的原因:

  一些浏览器中缺少对WebSocket的支持,因此,回退选项是必要的,而Spring框架提供了基于SockJS协议的透明的回退选项。

SockJS的一大好处在于提供了浏览器兼容性。优先使用原生WebSocket,如果在不支持websocket的浏览器中,会自动降为轮询的方式。
除此之外,spring也对socketJS提供了支持。

如果代码中添加了withSockJS()如下,服务器也会自动降级为轮询。

registry.addEndpoint("/coordination").withSockJS();

SockJS的目标是让应用程序使用WebSocket API,但在运行时需要在必要时返回到非WebSocket替代,即无需更改应用程序代码。

客户端与JAVA WebSocket建立连接

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<c:set var="ctx" value="${pageContext.request.contextPath}" />
<c:set var="ctxpath"
    value="${pageContext.request.scheme}${'://'}${pageContext.request.serverName}${':'}${pageContext.request.serverPort}${pageContext.request.contextPath}" />
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta charset=UTF-8">
<title>登录测试</title>
</head>
<body>
    <h2>Hello World! Web Socket by Spring</h2>
    <div>
        <span>sessionId:</span>
        <%
            HttpSession s= request.getSession();
            out.println(s.getId());
        %>
    </div>
    
    <input id="sessionId" type="hidden" value="<%=session.getId() %>" />
    <input id="text" type="text" />
    <button onclick="send()">发送消息</button>
    <hr />
    <button onclick="closeWebSocket()">关闭WebSocket连接</button>
    <hr />
    <div id="message"></div>
</body>
<script type="text/javascript" src="http://localhost:8088/static/js/sockjs-0.3.min.js"></script>
<script type="text/javascript"
        var websocket = null
        //判断当前浏览器是否支持WebSocket 
        //判断当前浏览器是否支持WebSocket 
        if('WebSocket' in window) {
            websocket = new WebSocket("ws://localhost:8088/websocket/webSocketBySpring/customWebSocketHandler?mchNo="+ 123); 
        } else if('MozWebSocket' in window) {
            websocket = new MozWebSocket("ws://localhost:8088/websocket/webSocketBySpring/customWebSocketHandler?mchNo="+ 123);
        } else {
            websocket = new SockJS("http://localhost:8088/websocket/sockjs/webSocketBySpring/customWebSocketHandler?mchNo="+ 123);
        }
        //连接发生错误的回调方法 
        websocket.onerror = function () { 
            setMessageInnerHTML("WebSocket连接发生错误"); 
        }; 
      
        //连接成功建立的回调方法 
        websocket.onopen = function () { 
            setMessageInnerHTML("WebSocket连接成功"); 
        
      
        //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("WebSocket连接关闭"); 
        
      
        //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 () { 
            closeWebSocket(); 
        
      
        //将消息显示在网页上 
        function setMessageInnerHTML(innerHTML) { 
            document.getElementById('message').innerHTML += innerHTML + '<br/>'
        
      
        //关闭WebSocket连接 
        function closeWebSocket() { 
            websocket.close(); 
        
      
        //发送消息 
        function send() { 
            var message = document.getElementById('text').value; 
            websocket.send(message); 
        
    </script>
</html>

到此这篇关于WebSocket使用Spring boot整合方法的文章就介绍到这了,更多相关Spring boot整合WebSocket内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家!

原文链接:https://www.cnblogs.com/haozhiweizhi/p/15303675.html

相关文章

热门资讯

蜘蛛侠3英雄无归3正片免费播放 蜘蛛侠3在线观看免费高清完整
蜘蛛侠3英雄无归3正片免费播放 蜘蛛侠3在线观看免费高清完整 2021-08-24
yue是什么意思 网络流行语yue了是什么梗
yue是什么意思 网络流行语yue了是什么梗 2020-10-11
背刺什么意思 网络词语背刺是什么梗
背刺什么意思 网络词语背刺是什么梗 2020-05-22
2020微信伤感网名听哭了 让对方看到心疼的伤感网名大全
2020微信伤感网名听哭了 让对方看到心疼的伤感网名大全 2019-12-26
2021年耽改剧名单 2021要播出的59部耽改剧列表
2021年耽改剧名单 2021要播出的59部耽改剧列表 2021-03-05
返回顶部