spring boot 下websocket实现的两种方法

websocket前台实现代码，保存为html执行就好

html代码来自：https://blog.csdn.net/M348915654/article/details/53616837

<html>
    <head>
        <meta charset="utf-8">
        <title>WebSoket Demo</title>
        <script type="text/JavaScript">
            // tips: WebSocket 调试脚本
            var WebSocket = WebSocket || window.WebSocket || window.MozWebSocket;
            // 验证浏览器是否支持WebSocket协议
            if (!WebSocket) {
                alert("WebSocket not supported by this browser!");
            }
            else {
                var g_ws = null;
 
                function Display() {
                    // 载入上次记录的数据 //...
                    console.log("websocket 测试");
                }
 
                var log = function (s) {
                    if (document.readyState !== "complete") {
                        log.buffer.push(s);
                    } else {
                        document.getElementById("contentId").value = (s + "
") + document.getElementById("contentId").value
                    }
                }
 
                function CreateConnect () {
                    var msg = document.getElementById("wsUrlId");
                    console.log("CreateConnect(), url: " + msg.value);
                    if (g_ws == null) {
                        var wsUrlValue = msg.value;
 
                        try {
                            g_ws = new WebSocket(wsUrlValue);
                            // 监听消息
                            g_ws.onmessage = function (event) {
                                //valueLabel.innerHTML+ = event.data;
                                log("onmessage(), 接收到服务器消息: " + event.data);
                            };
                            // 打开 WebSocket
                            g_ws.onclose = function (event) {
                                //WebSocket Status:: Socket Closed
                                log("onclose(), Socket 已关闭!");
                                g_ws = null;
                            };
                            // 打开WebSocket
                            g_ws.onopen = function (event) {
                                //WebSocket Status:: Socket Open
                                // 发送一个初始化消息
//                            g_ws.send("Hello, Server!");
                                log("onopen(), Socket 连接成功!");
                            };
                            g_ws.onerror = function (event) {
                                //WebSocket Status:: Error was reported
                                log("onerror(), Socket 发生错误!");
                            };
                        }
                        catch (e) {
                            g_ws = null;
                            log("连接异常, 重置 websocket");
                        }
                    }
                }
                
                function SendMsg() {
                    var msg = document.getElementById("messageId");
                    console.log("SendMsg(), msg: " + msg.value);
                    if (g_ws != null) {
                        //alert(msg.value);
                        log("发送 Socket 消息: " + msg.value);
                        g_ws.send(msg.value);
                    }
                    else {
                        log("Socket 还未创建!, msg: " + msg.value);
                    }
                }
 
                function CloseConnect () {
                    console.log("CloseConnect()");
                    if (g_ws != null) {
                        g_ws.close();
                    }
                }
            }
        </script>
    </head>
 
    <body onload="Display()">
        <div id="valueLabel"></div>
        <textarea rows="20" cols="30" id="contentId"></textarea>
        <br/>
        <input name="wsUrl" id="wsUrlId" value="ws://localhost:8888/websocket"/>
        <button id="createButton" onClick="javascript:CreateConnect()">Create</button>
        <button id="closeButton" onClick="javascript:CloseConnect()">Close</button>
        <br/>
        <input name="message" id="messageId" value="Hello, Server!"/>
        <button id="sendButton" onClick="javascript:SendMsg()">Send</button>
    </body>
</html>

方法一

配置：

/**
 * webSocket 方法一
 */
@Configuration
@ConditionalOnWebApplication
public class WebSocketConfig  {
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

实现：

/**
 * webSocket 方法一
 */
@Slf4j
@ServerEndpoint(value = "/websocket")
@Component
public class WebSocketServer {
    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session) {
      
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
       
    }

    /**
     * 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) {
       
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
     
    }
}

方法二：

配置

/**
 * webSocket方法二
 * @author tongxiabin
 */
@Component
@EnableWebMvc
@EnableWebSocket
public class WebSocketConfig2  implements WebSocketConfigurer {

    @Resource
    private MyWebSocketHandler handler;

    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(handler, "/wsMy").addInterceptors(new HandshakeInterceptor() {
            @Override
            public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Map<String, Object> map) throws Exception {
                System.out.println("registerWebSocketHandlers-beforeHandshake");
                serverHttpResponse.setStatusCode(HttpStatus.OK);
                return true;
            }

            @Override
            public void afterHandshake(ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Exception e) {
                System.out.println("registerWebSocketHandlers-afterHandshake");
            }
        }).setAllowedOrigins("*");
    }
}

实现：

/**
 * webSocket 方法二
 */
@Component
public class MyWebSocketHandler implements WebSocketHandler {

    private static final Map<String ,WebSocketSession> userMap=new HashMap<>();
    @Override
    public void afterConnectionEstablished(WebSocketSession webSocketSession) throws Exception {
       String jspCode = (String )webSocketSession.getAttributes().get("jspCode");

        if(userMap.get(jspCode)==null){
            System.out.println(jspCode);
            userMap.put(jspCode,webSocketSession);
        }
    }

    @Override
    public void handleMessage(WebSocketSession webSocketSession, WebSocketMessage<?> webSocketMessage) throws Exception {
        System.out.println("handleMessage");
    }

    @Override
    public void handleTransportError(WebSocketSession webSocketSession, Throwable throwable) throws Exception {
        System.out.println("handleTransportError");
    }

    @Override
    public void afterConnectionClosed(WebSocketSession webSocketSession, CloseStatus closeStatus) throws Exception {
        System.out.println("afterConnectionClosed");
    }

    @Override
    public boolean supportsPartialMessages() {
        return false;
    }
}
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原文地址：https://www.cnblogs.com/lobin/p/10567424.html