Package org.eclipse.jetty.websocket.server

Class JettyWebSocketServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.eclipse.jetty.websocket.server.JettyWebSocketServlet

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public abstract class JettyWebSocketServlet
extends javax.servlet.http.HttpServlet

Abstract Servlet used to bridge the Servlet API to the WebSocket API.

To use this servlet, you will be required to register your websockets with the WebSocketMappings so that it can create your websockets under the appropriate conditions.

The most basic implementation would be as follows:

 package my.example;

 import JettyWebSocketServlet;
 import JettyWebSocketServletFactory;

 public class MyEchoServlet extends JettyWebSocketServlet
 {
     @Override
     public void configure(JettyWebSocketServletFactory factory)
     {
       factory.setDefaultMaxFrameSize(4096);
       factory.addMapping(factory.parsePathSpec("/"), (req,res)->new EchoSocket());
     }
 }
 

Only request that conforms to a "WebSocket: Upgrade" handshake request will trigger the WebSocketMappings handling of creating WebSockets. All other requests are treated as normal servlet requests. The configuration defined by this servlet init parameters will be used as the customizer for any mappings created by JettyWebSocketServletFactory.addMapping(String, JettyWebSocketCreator) during configure(JettyWebSocketServletFactory) calls. The request upgrade may be peformed by this servlet, or is may be performed by a WebSocketUpgradeFilter instance that will share the same WebSocketMappings instance. If the filter is used, then the filter configuraton is used as the default configuration prior to this servlets configuration being applied.

Configuration / Init-Parameters:

idleTimeout

set the time in ms that a websocket may be idle before closing

maxTextMessageSize

set the size in UTF-8 bytes that a websocket may be accept as a Text Message before closing

maxBinaryMessageSize

set the size in bytes that a websocket may be accept as a Binary Message before closing

inputBufferSize

set the size in bytes of the buffer used to read raw bytes from the network layer
*

outputBufferSize

set the size in bytes of the buffer used to write bytes to the network layer

maxFrameSize

The maximum frame size sent or received.

autoFragment

If true, frames are automatically fragmented to respect the maximum frame size.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
JettyWebSocketServlet()

Method Summary

Modifier and Type	Method	Description
protected abstract void	configure(JettyWebSocketServletFactory factory)	Configure the JettyWebSocketServletFactory for this servlet instance by setting default configuration (which may be overriden by annotations) and mapping JettyWebSocketCreators.
void	init()
protected void	service(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp)

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doGet, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

JettyWebSocketServlet

public JettyWebSocketServlet()

Method Details

configure

protected abstract void configure(JettyWebSocketServletFactory factory)

Configure the JettyWebSocketServletFactory for this servlet instance by setting default configuration (which may be overriden by annotations) and mapping JettyWebSocketCreators. This method assumes a single FrameHandlerFactory will be available as a bean on the ContextHandler, which in practise will mostly the the Jetty WebSocket API factory.

Parameters:

factory - the JettyWebSocketServletFactory

init

public void init()
          throws javax.servlet.ServletException

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.servlet.ServletException

service

protected void service(javax.servlet.http.HttpServletRequest req,
 javax.servlet.http.HttpServletResponse resp)
                throws javax.servlet.ServletException,
IOException

Overrides:

service in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

IOException