websocket實現方式

1、jetty九、tomcat7     +  html5
一、server---pom.xml:  javascript

<!-- j2ee -->
		<dependency>
			<groupId>javax</groupId>
			<artifactId>javaee-api</artifactId>
			<version>7.0</version>
			<scope>provided</scope>
		</dependency>

二、server---java代碼:html

package com.bluedon.websocket;
import java.io.IOException;
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.ServerEndpoint;
//該註解用來指定一個URI,客戶端能夠經過這個URI來鏈接到WebSocket。相似Servlet的註解mapping。無需在web.xml中配置。
@ServerEndpoint("/webSocketServer")
public class WebSocketServer {
    //靜態變量,用來記錄當前在線鏈接數。應該把它設計成線程安全的。
    private static int onlineCount = 0;
     
    //concurrent包的線程安全Set,用來存放每一個客戶端對應的MyWebSocket對象。若要實現服務端與單一客戶端通訊的話,可使用Map來存放,其中Key能夠爲用戶標識
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
     
    //與某個客戶端的鏈接會話,須要經過它來給客戶端發送數據
    private Session session;
     
    /**
     * 鏈接創建成功調用的方法
     * @param session  可的參數。session爲與某個客戶端的鏈接會話,須要經過它來給客戶端發送數據
     */
    @OnOpen
    public void onOpen(Session session){
        this.session = session;
        webSocketSet.add(this);     //加入set中
        addOnlineCount();           //在線數加1
        System.out.println("新鏈接加入!當前在線人數爲" + getOnlineCount());
    }
     
    /**
     * 鏈接關閉調用的方法
     */
    @OnClose
    public void onClose(){
        webSocketSet.remove(this);  //從set中刪除
        subOnlineCount();           //在線數減1    
        System.out.println("一鏈接關閉!當前在線人數爲" + getOnlineCount());
    }
     
    /**
     * 收到客戶端消息後調用的方法
     * @param message 客戶端發送過來的消息
     * @param session 可的參數
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("來自客戶端的消息:" + message);
         
        //羣發消息
        for(WebSocketServer item: webSocketSet){             
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
                continue;
            }
        }
    }
     
    /**
     * 發生錯誤時調用
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error){
        System.out.println("發生錯誤");
        //error.printStackTrace();
    }
     
    /**
     * 這個方法與上面幾個方法不同。沒有用註解,是根據本身須要添加的方法。
     * @param message
     * @throws IOException
     */
    public void sendMessage(String message) throws IOException{
        this.session.getBasicRemote().sendText(message);
        //this.session.getAsyncRemote().sendText(message);
    }
 
    public static synchronized int getOnlineCount() {
        return onlineCount;
    }
 
    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }
     
    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }
}

三、html5:html5

<body>
    Welcome<br/><input id="text" type="text"/>
    <button onclick="send()">發送消息</button>
    <hr/>
    <button onclick="closeWebSocket()">關閉WebSocket鏈接</button>
    <hr/>
    <div id="message"></div>
</body>

<script type="text/javascript">
    var websocket = null;
    //判斷當前瀏覽器是否支持WebSocket
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://localhost:8080/websocket/webSocketServer");
    }
    else {
        alert('當前瀏覽器 Not support websocket')
    }

    //鏈接發生錯誤的回調方法
    websocket.onerror = function (e) {
        setMessageInnerHTML("WebSocket鏈接發生錯誤");
    };

    //鏈接成功創建的回調方法
    websocket.onopen = function () {
        setMessageInnerHTML("WebSocket鏈接成功");
    }

    //接收到消息的回調方法
    websocket.onmessage = function (event) {
        setMessageInnerHTML(event.data);
    }

    //鏈接關閉的回調方法
    websocket.onclose = function () {
        setMessageInnerHTML("WebSocket鏈接關閉");
    }

    //監聽窗口關閉事件,當窗口關閉時,主動去關閉websocket鏈接,防止鏈接還沒斷開就關閉窗口,server端會拋異常。
    window.onbeforeunload = function () {
        closeWebSocket();
    }

    //將消息顯示在網頁上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //關閉WebSocket鏈接
    function closeWebSocket() {
        websocket.close();
    }

    //發送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>

2、jetty九、tomcat7     +  客戶端java

一、服務端同上
二、客戶端web

pom.xml:api

<dependency>
		    <groupId>org.glassfish.tyrus.bundles</groupId>
		    <artifactId>tyrus-standalone-client</artifactId>
		    <version>1.13</version>
		</dependency>

或者

<dependency>
			<groupId>org.glassfish.tyrus</groupId>
			<artifactId>tyrus-client</artifactId>
			<version>1.1</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.tyrus</groupId>
			<artifactId>tyrus-container-grizzly</artifactId>
			<version>1.1</version>
		</dependency>

代碼:瀏覽器

public class test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		t1();
	}

	public static void t1() {
		WebsocketClient c = new WebsocketClient();
		WebsocketClient.connect(c, "ws://localhost:8088/websockets/webSocketServer");
		c.sendUserInfo("測試");
		try {
			Thread.sleep(100000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}
@ClientEndpoint
public class WebsocketClient {

	private Session session;

	@OnOpen
	public void init(Session session) {
		this.session = session;
	}

	@OnMessage
	public void onMessage(String userInfo) {
		System.out.println("client receiver String " + userInfo);
	}

	@OnError
	public void handleError(Throwable thw) {
		if (thw instanceof DecodeException) {
			Logger.getLogger("lwl")
					.info(session.getId() + " Error decoding incoming message: " + ((DecodeException) thw).getText());
		} else {
			Logger.getLogger("lwl").info(session.getId() + " Client WebSocket error: " + thw.getMessage());
		}
	}

	/**
	 * 創建於服務端的鏈接
	 * 
	 * @param client
	 * @param path
	 * @return
	 */
	public static Session connect(WebsocketClient clientEndpoint, String path) {
		WebSocketContainer wsc = ContainerProvider.getWebSocketContainer();
		try {
			return wsc.connectToServer(clientEndpoint, new URI(path));
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 向服務端發送數據
	 * 
	 * @param userInfo
	 */
	public void sendUserInfo(String text) {
		try {
			this.session.getBasicRemote().sendText(text);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 斷開與服務端的鏈接
	 */
	public void disconnect() {
		if (this.session != null) {
			try {
				this.session.close();
			} catch (IOException ioe) {
				System.out.println("Error closing the session: " + ioe);
			}
		}
	}
}

3、客戶端+服務端(不依賴與tomcat和jetty)
一、客戶端pom.xml、代碼同(二)
二、服務端
pom.xml:tomcat

<dependency>
			<groupId>org.glassfish.tyrus</groupId>
			<artifactId>tyrus-server</artifactId>
			<version>1.1</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.tyrus</groupId>
			<artifactId>tyrus-container-grizzly</artifactId>
			<version>1.1</version>
		</dependency>

代碼:安全

public class WebSocketServerStatic {
 
    public static void main(String[] args) {
        runServer();
    }
 
    public static void runServer() {
        Server server = new Server("localhost", 8080, "/websocket", WebSocketServer.class);
        try {
            server.start();
            Thread.currentThread().join();
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
        }
    }
}
@ServerEndpoint("/webSocketServer")
public class WebSocketServer {
    //靜態變量,用來記錄當前在線鏈接數。應該把它設計成線程安全的。
    private static int onlineCount = 0;
     
    //concurrent包的線程安全Set,用來存放每一個客戶端對應的MyWebSocket對象。若要實現服務端與單一客戶端通訊的話,可使用Map來存放,其中Key能夠爲用戶標識
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
     
    //與某個客戶端的鏈接會話,須要經過它來給客戶端發送數據
    private Session session;
     
    /**
     * 鏈接創建成功調用的方法
     * @param session  可的參數。session爲與某個客戶端的鏈接會話,須要經過它來給客戶端發送數據
     */
    @OnOpen
    public void onOpen(Session session){
        this.session = session;
        webSocketSet.add(this);     //加入set中
        addOnlineCount();           //在線數加1
        System.out.println("新鏈接加入!當前在線人數爲" + getOnlineCount());
    }
     
    /**
     * 鏈接關閉調用的方法
     */
    @OnClose
    public void onClose(){
        webSocketSet.remove(this);  //從set中刪除
        subOnlineCount();           //在線數減1    
        System.out.println("一鏈接關閉!當前在線人數爲" + getOnlineCount());
    }
     
    /**
     * 收到客戶端消息後調用的方法
     * @param message 客戶端發送過來的消息
     * @param session 可的參數
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("來自客戶端的消息:" + message);
         
        //羣發消息
        for(WebSocketServer item: webSocketSet){             
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
                continue;
            }
        }
    }
     
    /**
     * 發生錯誤時調用
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error){
        System.out.println("發生錯誤");
        //error.printStackTrace();
    }
     
    /**
     * 這個方法與上面幾個方法不同。沒有用註解,是根據本身須要添加的方法。
     * @param message
     * @throws IOException
     */
    public void sendMessage(String message) throws IOException{
        this.session.getBasicRemote().sendText(message);
        //this.session.getAsyncRemote().sendText(message);
    }
 
    public static synchronized int getOnlineCount() {
        return onlineCount;
    }
 
    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }
     
    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }
}
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