Java中初步使用websocket（springBoot版本）

一、什么是websocket

WebSocket是一种在Web应用程序中实现实时双向通信的协议。它为浏览器和服务器之间提供了一种持久连接，在一个连接上可以双向传输数据。相比传统的HTTP协议，WebSocket具有更低的延迟和更高的效率。

WebSocket使用了类似于握手的方式来建立连接。在握手过程中，浏览器和服务器会交换一些信息，以建立一个WebSocket连接。一旦连接建立，浏览器和服务器之间就可以实时地传输数据，而不需要每次都发起新的HTTP请求。

WebSocket协议可以在不同的平台和编程语言中实现，包括Web浏览器和服务器端。在Web浏览器中，可以使用JavaScript中的WebSocket API来实现WebSocket连接。在服务器端，可以使用各种编程语言和框架来实现WebSocket服务器。

WebSocket的应用场景非常广泛。它可以用于实时聊天应用、实时游戏、实时股票行情、实时协作编辑等需要实时通信的应用程序。通过WebSocket，开发人员可以更加方便地实现实时通信功能，提高用户体验。

这里我们使用Java配合springboot2进行使用。

二、依赖坐标地址

1.springBoot父级依赖

<!--依赖的父级工程-->
<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.6.6</version><relativePath/>
</parent>

2.springBoot依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency>

3.webSocket依赖

<dependency><groupId>org.java-websocket</groupId><artifactId>Java-WebSocket</artifactId><version>1.3.8</version>
</dependency>

三、代码

不多说了，直接拿去看吧，都在注释里面了。

服务器：

java">package com.blockchain.qgy.network.websocket;import com.blockchain.qgy.util.Strings;
import org.java_websocket.WebSocket;
import org.java_websocket.handshake.ClientHandshake;
import org.java_websocket.server.WebSocketServer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;import javax.annotation.PostConstruct;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.List;@Component
public class P2pPointServer {//日志记录private Logger logger = LoggerFactory.getLogger(P2pPointServer.class);//本机的Server的WebSocket端口private Integer port = 7001;//所有连接到服务器的WebSocket缓存器private List<WebSocket> localSockets = new ArrayList<>();public List<WebSocket> getLocalSockets() {return localSockets;}public void setLocalSockets(List<WebSocket> localSockets) {this.localSockets = localSockets;}@PostConstruct@Order(1)public void initServer(){final WebSocketServer socketServer = new WebSocketServer(new InetSocketAddress(port)) {//创建链接成功时触发@Overridepublic void onOpen(WebSocket webSocket, ClientHandshake clientHandshake) {sendMessage(webSocket,"孩子们，我回来了！");localSockets.add(webSocket);}//断开连接时触发@Overridepublic void onClose(WebSocket webSocket, int i, String s, boolean b) {logger.info(webSocket.getRemoteSocketAddress() + "客户端与服务器断开连接");localSockets.remove(webSocket);}//接收到消息时触发@Overridepublic void onMessage(WebSocket webSocket, String s) {logger.info("收到了客户端的消息：" + s);sendMessage(webSocket,"孩子们，我收到消息了");}//连接发送错误时调用，后触发onClose方法@Overridepublic void onError(WebSocket webSocket, Exception e) {logger.info(webSocket.getRemoteSocketAddress() + "客户端与服务器连接发送错误");localSockets.remove(webSocket);}@Overridepublic void onStart() {logger.info("孩子们我要启动了！！");}};socketServer.start();logger.info("Man!what can I say,我已经启动了");}/*** 一对一发送* @param webSocket：客户端* @param message：信息*/public void sendMessage(WebSocket webSocket,String message){logger.info("发送给"+webSocket.getRemoteSocketAddress().getPort() + "的p2p消息是：" + message);webSocket.send(message);}/*** 一对多发送* @param message：信息*/public void broatcast(String message){if (localSockets.size() == 0 || Strings.isNullOrEmpty(message)) return;logger.info("张开第三只眼");for (WebSocket webSocket : localSockets){this.sendMessage(webSocket,message);}logger.info("孩子们我燃尽了");}
}

客户端：

java">package com.blockchain.qgy.network.websocket;import com.blockchain.qgy.util.Strings;
import org.java_websocket.WebSocket;
import org.java_websocket.client.WebSocketClient;
import org.java_websocket.handshake.ServerHandshake;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;import javax.annotation.PostConstruct;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;@Component
public class P2pPointClient {//日志记录private Logger logger = LoggerFactory.getLogger(P2pPointClient.class);//服务器端的地址private String wsUrl = "ws://localhost:7001/";//所有连接到客户端的WebSocket缓存器private List<WebSocket> localSockets = new ArrayList<>();public List<WebSocket> getLocalSockets() {return localSockets;}public void setLocalSockets(List<WebSocket> localSockets) {this.localSockets = localSockets;}@PostConstruct@Order(2)public void connectServer(){try {final WebSocketClient socketClient = new WebSocketClient(new URI(wsUrl)) {@Overridepublic void onOpen(ServerHandshake serverHandshake) {sendMessage(this,"孩子们，我是客户端");localSockets.add(this);}@Overridepublic void onMessage(String s) {logger.info("收到服务器发来的信息："+s);}@Overridepublic void onClose(int i, String s, boolean b) {logger.info("断开连接");localSockets.remove(this);}@Overridepublic void onError(Exception e) {logger.info("连接错误");localSockets.remove(this);}};socketClient.connect();} catch (Exception e) {e.printStackTrace();logger.info("连接错误");}}/*** 一对一发送* @param webSocket：客户端* @param message：信息*/public void sendMessage(WebSocket webSocket,String message){logger.info("发送给"+webSocket.getRemoteSocketAddress().getPort() + "的p2p消息是：" + message);webSocket.send(message);}/*** 一对多发送* @param message：信息*/public void broatcast(String message){if (localSockets.size() == 0 || Strings.isNullOrEmpty(message)) return;logger.info("张开第三只眼");for (WebSocket webSocket : localSockets){this.sendMessage(webSocket,message);}logger.info("孩子们我燃尽了");}
}