netty-websocket-spring-boot-starter

中文文档 (Chinese Docs)

About

netty-websocket-spring-boot-starter will help you develop WebSocket server by using Netty in spring-boot,it is easy to develop by using annotation like spring-websocket

Requirement

• jdk version 1.8 or 1.8+

Quick Start

• add Dependencies:

	<dependency>
		<groupId>org.yeauty</groupId>
		<artifactId>netty-websocket-spring-boot-starter</artifactId>
		<version>0.10.0</version>
	</dependency>

• annotate @ServerEndpoint on endpoint class，and annotate @BeforeHandshake,@OnOpen,@OnClose,@OnError,@OnMessage,@OnBinary,@OnEvent on the method. e.g.

@ServerEndpoint(path = "/ws/{arg}")
public class MyWebSocket {

    @BeforeHandshake
    public void handshake(Session session, HttpHeaders headers, @RequestParam String req, @RequestParam MultiValueMap reqMap, @PathVariable String arg, @PathVariable Map pathMap){
        session.setSubprotocols("stomp");
        if (!"ok".equals(req)){
            System.out.println("Authentication failed!");
            session.close();
        }
    }
    
    @OnOpen
    public void onOpen(Session session, HttpHeaders headers, @RequestParam String req, @RequestParam MultiValueMap reqMap, @PathVariable String arg, @PathVariable Map pathMap){
        System.out.println("new connection");
        System.out.println(req);
    }

    @OnClose
    public void onClose(Session session) throws IOException {
       System.out.println("one connection closed"); 
    }

    @OnError
    public void onError(Session session, Throwable throwable) {
        throwable.printStackTrace();
    }

    @OnMessage
    public void onMessage(Session session, String message) {
        System.out.println(message);
        session.sendText("Hello Netty!");
    }

    @OnBinary
    public void onBinary(Session session, byte[] bytes) {
        for (byte b : bytes) {
            System.out.println(b);
        }
        session.sendBinary(bytes); 
    }

    @OnEvent
    public void onEvent(Session session, Object evt) {
        if (evt instanceof IdleStateEvent) {
            IdleStateEvent idleStateEvent = (IdleStateEvent) evt;
            switch (idleStateEvent.state()) {
                case READER_IDLE:
                    System.out.println("read idle");
                    break;
                case WRITER_IDLE:
                    System.out.println("write idle");
                    break;
                case ALL_IDLE:
                    System.out.println("all idle");
                    break;
                default:
                    break;
            }
        }
    }

}

• use Websocket client to connect ws://127.0.0.1:80/ws/xxx

Annotation

@ServerEndpoint

declaring ServerEndpointExporter in Spring configuration,it will scan for WebSocket endpoints that be annotated with ServerEndpoint . beans that be annotated with ServerEndpoint will be registered as a WebSocket endpoint. all configurations are inside this annotation ( e.g. @ServerEndpoint("/ws") )

@BeforeHandshake

when there is a connection accepted,the method annotated with @BeforeHandshake will be called
classes which be injected to the method are:Session,HttpHeaders...

@OnOpen

when there is a WebSocket connection completed,the method annotated with @OnOpen will be called
classes which be injected to the method are:Session,HttpHeaders...

@OnClose

when a WebSocket connection closed,the method annotated with @OnClose will be called classes which be injected to the method are:Session

@OnError

when a WebSocket connection throw Throwable, the method annotated with @OnError will be called classes which be injected to the method are:Session,Throwable

@OnMessage

when a WebSocket connection received a message,the method annotated with @OnMessage will be called classes which be injected to the method are:Session,String

@OnBinary

when a WebSocket connection received the binary,the method annotated with @OnBinary will be called classes which be injected to the method are:Session,byte[]

@OnEvent

when a WebSocket connection received the event of Netty,the method annotated with @OnEvent will be called classes which be injected to the method are:Session,Object

Configuration

all configurations are configured in @ServerEndpoint's property

Configuration by application.properties

You can get the configurate of application.properties by using ${...} placeholders. for example：

• first,use ${...} in @ServerEndpoint

@ServerEndpoint(host = "${ws.host}",port = "${ws.port}")
public class MyWebSocket {
    ...
}

• then configurate in application.properties

ws.host=0.0.0.0
ws.port=80

Custom Favicon

The way of configure favicon is the same as spring-boot.If favicon.ico is presented in the root of the classpath,it will be automatically used as the favicon of the application.the example is following:

src/
  +- main/
      +- java/
      |   + <source code>
      +- resources/
          +- favicon.ico

Custom Error Pages

The way of configure favicon is the same as spring-boot.you can add a file to an /public/error folder.The name of the error page should be the exact status code or a series mask.the example is following:

src/
  +- main/
      +- java/
      |   + <source code>
      +- resources/
          +- public/
              +- error/
              |   +- 404.html
              |   +- 5xx.html
              +- <other public assets>

Multi Endpoint

• base on Quick-Start,use annotation @ServerEndpoint and @Component in classes which hope to become a endpoint.
• you can get all socket addresses in ServerEndpointExporter.getInetSocketAddressSet().
• when there are different addresses(different host or different port) in WebSocket,they will use different ServerBootstrap instance.
• when the addresses are the same,but path is different,they will use the same ServerBootstrap instance.
• when multiple port of endpoint is 0 ,they will use the same random port
• when multiple port of endpoint is the same as the path,host can't be set as "0.0.0.0",because it means it binds all of the addresses

Change Log

0.8.0

• Auto-Configuration

0.9.0

• Support RESTful by @PathVariable
• Get param by@RequestParam from query
• Remove ParameterMap ,instead of @RequestParam MultiValueMap
• Add @BeforeHandshake annotation，you can close the connect before handshake
• Set sub-protocol in @BeforeHandshake event
• Remove the @Component on endpoint class
• Update Netty version to 4.1.44.Final

0.9.1

• Bug fixed : it was null when using @RequestParam MultiValueMap to get value
• Update Netty version to 4.1.45.Final

0.9.2

• There are compatibility version under 0.8.0 that can configure the ServerEndpointExporter manully

0.9.3

• Bug fixed ：when there is no @BeforeHandshake , NullPointerException will appear

0.9.4

• Bug fixed ：when there is no @BeforeHandshake , Session in OnOpen is null

0.9.5

• Bug fixed ：Throwable in OnError event is null

0.10.0

• Modified the default value of bossLoopGroupThreads to 1
• Supports configuring useEventExecutorGroup to run synchronous and time-consuming business logic in EventExecutorGroup, so that the I/O thread is not blocked by a time-consuming task
• SSL supported
• CORS supported
• Update Netty version to 4.1.49.Final