Question

我在我的应用程序中嵌入了Jetty（版本 - 9.4.1.v20170120）websockets api，并为它实现了以下两个类

    import org.eclipse.jetty.server.Server;
    import org.eclipse.jetty.websocket.server.WebSocketHandler;
    import org.eclipse.jetty.websocket.servlet.WebSocketServletFactory;

    public class WebSocketTest{
        private static final int MAX_MESSAGE_SIZE = 3000000;

        public static void main(String[] args) throws Exception {
            Server server = new Server(9999);
            WebSocketHandler wsHandler = new WebSocketHandler() {
                @Override
                public void configure(WebSocketServletFactory factory) {

                  factory.getPolicy().setMaxBinaryMessageSize(MAX_MESSAGE_SIZE);
                factory.register(MyWebSocketHandler.class);

            }
        };
        server.setHandler(wsHandler);
        server.start();
        server.join();
    }
}

和

import org.apache.commons.io.FileUtils;
import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.annotations.*;
import org.eclipse.jetty.websocket.api.annotations.WebSocket;

import java.io.File;
import java.io.IOException;

@WebSocket
public class MyWebSocketHandler  {
    private Session session;

    @OnWebSocketClose
    public void onClose(int statusCode, String reason) {
        System.out.println("Close: statusCode=" + statusCode + ", reason=" + reason);
    }

    @OnWebSocketError
    public void onError(Throwable t) {
        System.out.println("Error: " + t.getMessage());
    }

    @OnWebSocketConnect
    public void onConnect(Session session) {
        this.session = session;
        System.out.println("Connect: " + session.getRemoteAddress().getAddress());
        try {
            session.getRemote().sendString("Hello Webbrowser");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public void onBinaryMessage(byte[] data, int offset, int length) throws IOException {
        System.out.println("Wriiten");
        FileUtils.writeByteArrayToFile(new File(System.nanoTime()+"hello.jpg"), data);
        try {
            this.session.getRemote().sendString("Receiving Binary Data==>"+data);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @OnWebSocketMessage
    public void onMessage(String message) {
        System.out.println("String Message ====> " + message);
        try {
            this.session.getRemote().sendString("Receiving String Data==>"+message);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

但是当我使用带有AndroidAsync的Android应用程序发送字节时，onBinaryMessage函数没有被调用，实际上我甚至使用onFrame方法记录了Message类型，但我收到的消息只有＆＃39; TEXT＆＃39;类型，没有二进制类型。所以我得到字符串，但不是字节。怎么办???我还检查了其他stackoverflow帖子，但没有人有答案？

Answer 1

刚刚在这里使用方法重载工作（经过大量搜索后在网上找到了一些帖子... jetty websocket文档和javadoc非常糟糕）

@OnWebSocketMessage
    public void onMessage(byte[] data, int offset, int length) throws IOException {
        System.out.println("Wriiten");
        FileUtils.writeByteArrayToFile(new File(System.nanoTime()+"hello.jpg"), data);
        try {
            this.session.getRemote().sendString("Receiving Binary Data==>"+data);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

所以现在MyWebSocketHandler.java看起来像

import org.apache.commons.io.FileUtils;
import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.annotations.*;
import org.eclipse.jetty.websocket.api.annotations.WebSocket;

import java.io.File;
import java.io.IOException;

@WebSocket
public class MyWebSocketHandler  {
    private Session session;

    @OnWebSocketClose
    public void onClose(int statusCode, String reason) {
        System.out.println("Close: statusCode=" + statusCode + ", reason=" + reason);
    }

    @OnWebSocketError
    public void onError(Throwable t) {
        System.out.println("Error: " + t.getMessage());
    }

    @OnWebSocketConnect
    public void onConnect(Session session) {
        this.session = session;
        System.out.println("Connect: " + session.getRemoteAddress().getAddress());
        try {
            session.getRemote().sendString("Hello Webbrowser");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @OnWebSocketMessage
    public void onMessage(byte[] data, int offset, int length) throws IOException {
        System.out.println("Wriiten");
        FileUtils.writeByteArrayToFile(new File(System.nanoTime()+"hello.jpg"), data);
        try {
            this.session.getRemote().sendString("Receiving Binary Data==>"+data);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @OnWebSocketMessage
    public void onMessage(String message) {
        System.out.println("String Message ====> " + message);
        try {
            this.session.getRemote().sendString("Receiving String Data==>"+message);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

虽然我得到了答案，但我仍然想发布它，因为它可能会帮助别人！因为我无法通过堆栈溢出找到它

Jetty WebSockets onBinaryMessage函数未被调用

和

1 个答案: