javax websocket实现签名校验，请提供客户端和服务端的代码实现-Go服务器开发

以下是一个简单的示例，展示了如何在Java中使用javax.websocket实现签名校验的WebSocket客户端和服务端代码实现。

WebSocket客户端代码：

import org.apache.commons.codec.binary.Base64;

import javax.websocket.*;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

@ClientEndpoint
public class WebSocketClient {
    private Session session;

    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        String signature = generateSignature("your_secret_key");
        try {
            session.getBasicRemote().sendText(signature);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("Received message: " + message);
    }

    @OnError
    public void onError(Throwable t) {
        t.printStackTrace();
    }

    @OnClose
    public void onClose() {
        System.out.println("Connection closed");
    }

    private String generateSignature(String secretKey) throws NoSuchAlgorithmException {
        long timestamp = System.currentTimeMillis() / 1000L; // 获取当前时间戳（秒）
        
        // 生成签名字符串，这里仅为示例，具体签名逻辑请根据实际需求进行调整
        String signatureString = secretKey + timestamp; 
        
        // 计算SHA-256哈希值并进行Base64编码，作为签名传输给服务端
        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        byte[] hashBytes = digest.digest(signatureString.getBytes(StandardCharsets.UTF_8));
        
        return Base64.encodeBase64String(hashBytes);
    }

    public static void main(String[] args) {
        WebSocketContainer container = ContainerProvider.getWebSocketContainer();
        try {
            Session session = container.connectToServer(WebSocketClient.class, new URI("ws://localhost:8080/websocket"));
            session.getBasicRemote().sendText("Hello server");
        } catch (DeploymentException | URISyntaxException | Exception e) {
            e.printStackTrace();
        }
    }
}

WebSocket服务端代码：

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;

@ServerEndpoint("/websocket")
public class WebSocketServer {

    @OnOpen
    public void onOpen(Session session) throws IOException {
        System.out.println("Connection opened from client");
    }

    @OnMessage
    public void onMessage(String message, Session session) throws IOException {
        System.out.println("Received message from client: " + message);
        
        // 在此处进行签名校验逻辑，验证客户端发送的签名是否合法
        
        session.getBasicRemote().sendText("Hello client");
    }

    @OnError
    public void onError(Throwable t) {
        t.printStackTrace();
    }

    @OnClose
    public void onClose() {
        System.out.println("Connection closed by client");
    }
}

请注意，以上代码仅为示例，实际的签名校验逻辑应根据具体需求进行实现和调整。另外，还需要将相关依赖项（如javax.websocket-api、Apache Commons Codec等）添加到项目中。

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