Question

我不禁想到有一个非常简单的解决方案但到目前为止没有运气。我想我已经走到互联网的边缘，回头看，阅读整个RFC6455以了解幕后发生的事情等等。我使用eclipse进行开发，并在开发机器上运行最新的tomcat。

这是我的测试类，eclipse甚至不会编译，因为它表明我需要删除受保护的StreamInbound方法上的@Override。实际措辞：

wsListenerTest类型的createWebSocketInbound（String）方法必须覆盖或实现超类型方法;

并建议删除@Override。

我正在尝试在没有任何其他服务器或插件的情况下为Tomcat做原生的一切。

提前致谢

package com.blah.blah;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;
import org.apache.catalina.websocket.WsOutbound;


public class wsListenerTest extends WebSocketServlet {

private static final long serialVersionUID = 1L;
static int numConnections = 0;

    private static final String GUEST_PREFIX = "Guest";

    private final AtomicInteger connectionIds = new AtomicInteger(0);
    private final Set<ChatMessageInbound> connections = new CopyOnWriteArraySet<ChatMessageInbound>();

    @Override
    protected StreamInbound createWebSocketInbound(String subProtocol) {
        return new ChatMessageInbound(connectionIds.incrementAndGet());
    }

    private final class ChatMessageInbound extends MessageInbound {

        private final String nickname;

        private ChatMessageInbound(int id) {
            this.nickname = GUEST_PREFIX + id;
        }

        @Override
        protected void onOpen(WsOutbound outbound) {
            connections.add(this);
            String message = String.format("* %s %s",
                    nickname, "has joined.");
            broadcast(message);
        }

        @Override
        protected void onClose(int status) {
            connections.remove(this);
            String message = String.format("* %s %s",
                    nickname, "has disconnected.");
            broadcast(message);
        }

        @Override
        protected void onBinaryMessage(ByteBuffer message) throws IOException {
            throw new UnsupportedOperationException(
                    "Binary message not supported.");
        }

        @Override
        protected void onTextMessage(CharBuffer message) throws IOException {
            // Never trust the client
//                String filteredMessage = String.format("%s: %s",nickname, HTMLFilter.filter(message.toString()));
            broadcast(message.toString());
        }

        private void broadcast(String message) {
            for (ChatMessageInbound connection : connections) {
                try {
                    CharBuffer buffer = CharBuffer.wrap(message);
                    connection.getWsOutbound().writeTextMessage(buffer);
                } catch (IOException ignore) {
                    // Ignore
                }
            }
        }
    }
}

Answer 1

我认为编译器抱怨这个@Override，因为WebSocketServlet的createWebSocketInbound()方法有以下

protected abstract StreamInbound createWebSocketInbound(String subProtocol,
                                                        HttpServletRequest request);

尝试将HttpServletRequest参数添加到您的方法中，这应该有助于您超越此障碍。

试图在tomcat 7上实现非常基本的聊天（最新版本7.0.34）

1 个答案: