tomcat中有提到：

If the application does not define a MessageHandler.Partial for incoming text messages, any incoming text messages must be buffered so the entire message can be delivered in a single call to the registered MessageHandler.

Whole for text messages. The default buffer size for text messages is 8192 bytes. This may be changed for a web application by setting the servlet context initialization parameter org.apache.tomcat.websocket.

textBufferSize to the desired value in bytes.

1、对项目web.xml添加如下配置(注意单位为byte)

org.apache.tomcat.websocket.textBufferSize

5242800

2、对于spring工程来说这个方法没问题可以生效，但是springboot并没有web.xml该如何解决呢？如下：

@Configuration

@ComponentScan

@EnableAutoConfigurationpublic class WebSocketConfig implementsServletContextInitializer{//配置websocket传输大小，50M

@Overridepublic void onStartup(ServletContext servletContext) throwsServletException {

servletContext.addListener(WebAppRootListener.class);

servletContext.setInitParameter("org.apache.tomcat.websocket.textBufferSize","52428800");

servletContext.setInitParameter("org.apache.tomcat.websocket.binaryBufferSize","52428800");

}

}

注意：在使用的时候还发现了一个问题，如上配置假如是以springboot内置tomcat启动是没有问题的，但是打成war后使用外置tomcat运行却不生效，最终发现是因为外置tomcat版本问题，出问题的版本是tomcat8.0.xx，而使用tomcat8.5.xx就没有这个问题了