java - 嵌入式tomcat 8.0.21中的Spring websocket

Question

我想根据示例创建一个 WebSocket。唯一的问题是我在嵌入式 tomcat 中运行我的应用程序。

package com.test.websocket;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.AbstractWebSocketHandler;

public class WebSocketTest extends AbstractWebSocketHandler {
    private static Logger logger = LoggerFactory.getLogger(WebSocketTest.class);

    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        logger.debug("Recieved websocket message: " + message);

        session.sendMessage(new TextMessage("thanks"));
    }

    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        logger.info("WebSocket connection established!");
    }

    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        logger.info("WebSocket connection closed!");
    }
}

配置(websocket.spring.xml):

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:websocket="http://www.springframework.org/schema/websocket"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
              http://www.springframework.org/schema/beans/spring-beans.xsd
              http://www.springframework.org/schema/websocket
              http://www.springframework.org/schema/websocket/spring-websocket.xsd">

       <websocket:handlers>
              <websocket:mapping path="/socket" handler="webSocketHandler"/>
       </websocket:handlers>

       <bean id="webSocketHandler" class="com.test.websocket.WebSocketTest"/>
</beans>

Servlet 映射在/websocket/*

从日志来看，似乎 spring-websocket 已成功初始化，但是当我尝试连接到 websocket 时出现此错误。

Servlet.service() for servlet [spring-websocket] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.socket.server.HandshakeFailureException: Uncaught failure for request http://localhost:9876/websocket/socket; nested exception is java.lang.IllegalArgumentException: No 'javax.websocket.server.ServerContainer' ServletContext attribute. Are you running in a Servlet container that supports JSR-356?] with root cause

依赖项是:tomcat-embed-core、tomcat-embed-websocket、tomcat-juli 以及因为(Spring websocket example - error - Are you running in a Servlet container that supports J SR-356?)javax.websocket-api 和 tomcat-websocket

我错过了什么？

提前致谢!

Answer 1

也许我找到了解决您问题的方法。

您需要对嵌入式 tomcat 上下文使用 WsSci servlet 容器初始化程序:

context.addServletContainerInitializer(new WsSci(), null);

https://github.com/spring-projects/spring-boot/issues/439