android websocket推送

1、通过WebSocketServlet来实现

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

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 ChatWebSocketServlet extends WebSocketServlet {
    /**
     *
     */
    private static final long serialVersionUID = 911879078000755859L;
    //private final Map<Integer, WsOutbound> map = new HashMap<Integer, WsOutbound>();
    private final Map<String,WsOutbound> users = new HashMap<String,WsOutbound>();

    @Override
    protected StreamInbound createWebSocketInbound(String arg0, HttpServletRequest request)
    {
        String username = null;
        try {
            username = request.getParameter("username");
            System.out.println(username);
            if(username != null){
                username = new String(username.getBytes("ISO8859_1"),"UTF-8");
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println(username+" 请求连接：");
        return new ChatMessageInbound(username);
    }

    class ChatMessageInbound extends MessageInbound {

        private String userName = "user";

        public ChatMessageInbound(String userName) {
                this.userName = userName;
        }

        @Override
        protected void onOpen(WsOutbound outbound) {
            users.put(userName, outbound);
            System.out.println(userName+"上线了,总共"+users.size()+"人在线");
            super.onOpen(outbound);
        }

        @Override
        protected void onClose(int status) {
            users.remove(userName);
            System.out.println("下线："+userName);
            super.onClose(status);
        }

        @Override
        protected void onBinaryMessage(ByteBuffer buffer) throws IOException {
            // TODO Auto-generated method stub
        }

        @Override
        protected void onTextMessage(CharBuffer buffer) throws IOException {

            String msg = buffer.toString();
            System.out.println(userName+"："+msg);
            Date date = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
            msg = userName+" " + sdf.format(date)+":\n" + msg;
            broadcast(msg);
        }

        private void broadcast(String msg) {
            Set<String> set = users.keySet();
            for (String name : set)
            {
                    WsOutbound outbound = users.get(name);

                    CharBuffer buffer = CharBuffer.wrap(msg);
                    try {
                            outbound.writeTextMessage(buffer);
                            outbound.flush();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                System.out.println(name+"----");

            }
        }
    }
}

2、通过@ServerEndpoint注解

import java.io.IOException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint(value = "/ws/chat/{nickName}")
public class Chat {

    /**
     * 连接对象集合
     */
    private static final Set<Chat> connections = new CopyOnWriteArraySet<Chat>();

    private String nickName;

    /**
     * WebSocket Session
     */
    private Session session;

    public Chat() {
    }

    /**
     * 打开连接
     *
     * @param session
     * @param nickName
     */
    @OnOpen
    public void onOpen(Session session,
            @PathParam(value = "nickName") String nickName) {

        this.session = session;
        this.nickName = nickName;

        connections.add(this);
        String message = String.format("System> %s %s", this.nickName,
                " has joined.");
        Chat.broadCast(message);
        System.out.println(message);
    }

    /**
     * 关闭连接
     */
    @OnClose
    public void onClose() {
        connections.remove(this);
        String message = String.format("System> %s, %s", this.nickName,
                " has disconnection.");
        Chat.broadCast(message);
        System.out.println(message);
    }

    /**
     * 接收信息
     *
     * @param message
     * @param nickName
     */
    @OnMessage
    public void onMessage(String message,
            @PathParam(value = "nickName") String nickName) {
        Chat.broadCast(nickName + ">" + message);
        System.out.println(message);
    }

    /**
     * 错误信息响应
     *
     * @param throwable
     */
    @OnError
    public void onError(Throwable throwable) {
        System.out.println(throwable.getMessage());
    }

    /**
     * 发送或广播信息
     *
     * @param message
     */
    private static void broadCast(String message) {
        for (Chat chat : connections) {
            try {
                synchronized (chat) {
                    chat.session.getBasicRemote().sendText(message);
                }
            } catch (IOException e) {
                connections.remove(chat);
                try {
                    chat.session.close();
                } catch (IOException e1) {
                }
                Chat.broadCast(String.format("System> %s %s", chat.nickName,
                        " has bean disconnection."));
                System.out.println(String.format("System> %s %s", chat.nickName,
                        " has bean disconnection."));
            }
        }
    }
}

3、android

package com.example.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.Toast;
import de.tavendo.autobahn.WebSocketConnection;
import de.tavendo.autobahn.WebSocketConnectionHandler;
import de.tavendo.autobahn.WebSocketException;

public class MainActivity extends Activity {

    final WebSocketConnection wsc = new WebSocketConnection();
    private EditText edt;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edt = (EditText) findViewById(R.id.edt1);
        findViewById(R.id.btn1).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (wsc.isConnected()) {
                    wsc.sendTextMessage(edt.getText().toString());
                } else {
                    Toast.makeText(getApplicationContext(), "请先加入",
                            Toast.LENGTH_SHORT).show();
                }
            }
        });
        // System.out.println("websocket///");
        findViewById(R.id.btn2).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                try {
                    //"ws://192.168.1.106:9090/websocket01/chat.ws?username=server11"
                    String url = "ws://192.168.1.106:8080/websocket01/ws/chat/server11";
                    wsc.connect(url,
                            new WebSocketConnectionHandler() {

                                @Override
                                public void onBinaryMessage(byte[] payload) {
                                    System.out.println("onBinaryMessage size="
                                            + payload.length);
                                }

                                @Override
                                public void onClose(int code, String reason) {
                                    System.out.println("onClose reason="
                                            + reason);
                                }

                                @Override
                                public void onOpen() {
                                    System.out.println("onOpen");
                                    wsc.sendTextMessage("Hello!");
                                    // wsc.disconnect();
                                }

                                @Override
                                public void onRawTextMessage(byte[] payload) {
                                    System.out.println("onRawTextMessage size="
                                            + payload.length);

                                }

                                @Override
                                public void onTextMessage(String payload) {
                                    System.out.println("onTextMessage"
                                            + payload);
                                    edt.setText(payload);
                                }
                            });
                } catch (WebSocketException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        });

    }

    @Override
    protected void onStop() {
        wsc.disconnect();
        super.onStop();
    }

}

来自网络，稍加修改。

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