java js实现Websocket通讯实例

本文主要介绍如何使用java实现websocket server，以及使用java、js生成websocket client进行通讯交互

1、java所需jar包

<dependency><groupId>javax.websocket</groupId><artifactId>javax.websocket-api</artifactId><version>1.0</version></dependency><dependency><groupId>org.java-websocket</groupId><artifactId>Java-WebSocket</artifactId><version>1.3.0</version></dependency>

2、java类server实现

import java.net.InetSocketAddress;import java.util.List;import java.util.Map;import java.util.Set;import org.java_websocket.WebSocket;import org.java_websocket.handshake.ClientHandshake;import org.java_websocket.server.WebSocketServer;import com.google.common.collect.Lists;import com.google.common.collect.Maps;import com.yy.ent.commons.base.valid.BlankUtil;public class MliveWebSocket extends WebSocketServer {        public static Map<String, List<WebSocket>> socketMap = Maps.newHashMap();//频道-进入频道用户的连接列表        public MliveWebSocket(InetSocketAddress address) {        super(address);    }        /**     *      * @param address     * @param decoders用于限制websocket版本号     */    public MliveWebSocket(InetSocketAddress address, int decoders) {        super(address, decoders);    }    @Override    public void onOpen(WebSocket conn, ClientHandshake handshake) {        System.out.println("onOpen");        String desc = handshake.getResourceDescriptor().substring(1);//例如页面请求：'ws://127.0.0.1:4444/'+topSid; desc获取到的就是topSid。此处以desc区分不同分类的连接，用于后续通讯        if(BlankUtil.isBlank(socketMap.get(desc))){            List<WebSocket> list = Lists.newArrayList();            list.add(conn);//connect成功时候执行            socketMap.put(desc, list);        } else {            socketMap.get(desc).add(conn);        }    }    @Override    public void onClose(WebSocket conn, int code, String reason, boolean remote) {        System.out.println("onClose");        Set<String> setList = socketMap.keySet();        for (String string : setList) {            if (socketMap.get(string).contains(conn)) {                socketMap.get(string).remove(conn);//删除连接                if (socketMap.get(string).isEmpty()) {//连接为空时清除                    socketMap.remove(string);                }                break;            }        }    }    @Override    public void onMessage(WebSocket conn, String message) {        System.out.println("onMessage");        System.out.println(message);        /*List<WebSocket> socketList = socketMap.get(message);        for (WebSocket webSocket : socketList) {            webSocket.send("已收到~");        }*/        sendInAllChannel("~已收到~");//测试收到信息时全局发送消息    }    @Override    public void onError(WebSocket conn, Exception ex) {        System.out.println("onError");        Set<String> setList = socketMap.keySet();        for (String string : setList) {            if (socketMap.get(string).contains(conn)) {                socketMap.get(string).remove(conn);//删除连接                if (socketMap.get(string).isEmpty()) {//连接为空时清除                    socketMap.remove(string);                }                break;            }        }    }        /**     * 服务端启动     * @param args     */    public static void main(String[] args) {        InetSocketAddress address = new InetSocketAddress(4444);        MliveWebSocket socket = new MliveWebSocket(address);        socket.start();//启动websocket服务器进程    }        /**     * 发送消息到某一个连接     * @param channel     * @param message     */    public void sendInOneChannel(String channel,String message){        List<WebSocket> list = socketMap.get(channel);        for (WebSocket webSocket : list) {            webSocket.send(message);        }    }        /**     * 发送消息到所有连接     * @param message     */    public void sendInAllChannel(String message){        Set<String> setList = socketMap.keySet();        for (String string : setList) {            List<WebSocket> list = socketMap.get(string);            for (WebSocket webSocket : list) {                webSocket.send(message);            }        }    }}

3、html5 js连接java server

function svc_connectPlatform(topSid) {var wsServer = 'ws://127.0.0.1:4444/'+topSid;    try {svc_websocket = new WebSocket(wsServer);    } catch (evt) {console.log("new WebSocket error:" + evt.data);svc_websocket = null;if (typeof(connCb) != "undefined" && connCb != null)connCb("-1", "connect error!");return;    }svc_websocket.onopen = svc_onOpen;svc_websocket.onclose = svc_onClose;svc_websocket.onmessage = svc_onMessage;svc_websocket.onerror = svc_onError;}function svc_onOpen(evt) {console.log("Connected to WebSocket server.");}function svc_onClose(evt) { console.log("Disconnected");}function svc_onMessage(evt) {console.log('Retrieved data from server: ' + evt.data);}function svc_onError(evt) {console.log('Error occured: ' + evt.data);}function svc_send(msg) {if (svc_websocket.readyState == WebSocket.OPEN) {svc_websocket.send(msg);} else {console.log("send failed. websocket not open. please check.");}}

4、java实现websocket客户端

import java.net.URI;import java.nio.channels.NotYetConnectedException;import org.java_websocket.WebSocket.READYSTATE;import org.java_websocket.client.WebSocketClient;import org.java_websocket.handshake.ServerHandshake;/** * websocket java客户端 * @author Administrator * */public class MliveWebSocketClient extends WebSocketClient {    public MliveWebSocketClient(URI serverURI) {        super(serverURI);        // TODO Auto-generated constructor stub    }    @Override    public void onOpen(ServerHandshake handshakedata) {        // TODO Auto-generated method stub        System.out.println("onOpen");    }    @Override    public void onMessage(String message) {        // TODO Auto-generated method stub        System.out.println("onMessage");        System.out.println(message);    }    @Override    public void onClose(int code, String reason, boolean remote) {        // TODO Auto-generated method stub        System.out.println("onClose");    }    @Override    public void onError(Exception ex) {        // TODO Auto-generated method stub        System.out.println("onError");    }    public static void main(String[] args) {        MliveWebSocketClient client = new MliveWebSocketClient(URI.create("ws://127.0.0.1:4444/1111"));        try {            client.connect();            //NOT_YET_CONNECTED, CONNECTING, OPEN, CLOSING, CLOSED;连接的所有状态            int i = 0;            while(true){                if(client.getReadyState() == READYSTATE.OPEN){                    client.send("hell0");//状态为open才可以发送消息                    break;                } else if(client.getReadyState() != READYSTATE.CLOSED){                    System.out.println(client.getReadyState()+""+(i++));                    Thread.sleep(1000);                } else {                    break;                }            }        } catch (NotYetConnectedException e) {            e.printStackTrace();        } catch (Exception e) {            e.printStackTrace();        }    }}