使用websocket 和apache ssd写一个从前端输入命令到远程服务器执行的Java程序

这里是一个基本的Java程序示例，可以使用WebSocket和Apache SSH库将从前端输入的命令发送到远程服务器并执行：

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import org.apache.sshd.client.SshClient;
import org.apache.sshd.client.channel.ChannelExec;
import org.apache.sshd.client.keyverifier.PromiscuousVerifier;
import org.apache.sshd.client.session.ClientSession;
import org.apache.sshd.common.keyprovider.FileKeyPairProvider;
import org.apache.sshd.common.util.io.NoCloseInputStream;
import org.glassfish.tyrus.client.ClientManager;
import org.glassfish.tyrus.client.ClientProperties;
import org.glassfish.tyrus.client.SslContextConfigurator;
import org.glassfish.tyrus.client.auth.AuthConfig;
import org.glassfish.tyrus.client.auth.Credentials;

import javax.net.ssl.SSLContext;
import javax.websocket.ClientEndpoint;
import javax.websocket.CloseReason;
import javax.websocket.ContainerProvider;
import javax.websocket.DeploymentException;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.WebSocketContainer;

@ClientEndpoint
public class RemoteShellClient {

    private static final String REMOTE_HOST = "remote.hostname.com";
    private static final int REMOTE_PORT = 22;
    private static final String REMOTE_USERNAME = "remote_username";
    private static final String REMOTE_PASSWORD = "remote_password";
    private static final String REMOTE_PRIVATE_KEY_PATH = "/path/to/remote/private/key";
    private static final String REMOTE_PUBLIC_KEY_PATH = "/path/to/remote/public/key";
    private static final String WEBSOCKET_URL = "wss://websocket.server.com";

    private Session websocketSession;
    private ClientSession sshSession;
    private ChannelExec sshChannel;

    private CountDownLatch latch;

    public RemoteShellClient() {
        this.latch = new CountDownLatch(1);
    }

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

    @OnMessage
    public void onWebSocketText(String command) {
        try {
            // Connect to remote host
            SshClient client = SshClient.setUpDefaultClient();
            client.setKeyPairProvider(new FileKeyPairProvider(new String[] { REMOTE_PRIVATE_KEY_PATH }));
            client.setServerKeyVerifier(new PromiscuousVerifier());
            client.start();

            // Authenticate with remote host
            AuthConfig authConfig = AuthConfig.builder()
                    .setCredentials(new Credentials() {
                        @Override
                        public boolean matches(String username, String password) {
                            return REMOTE_USERNAME.equals(username) && REMOTE_PASSWORD.equals(password);
                        }
                    })
                    .build();
            this.sshSession = client.connect(REMOTE_HOST, REMOTE_PORT).auth(authConfig).getSession();

            // Start shell channel
            this.sshChannel = (ChannelExec) this.sshSession.createChannel("exec");
            this.sshChannel.setCommand(command);
            this.sshChannel.setIn(new NoCloseInputStream(System.in));
            this.sshChannel.setOut(System.out);
            this.sshChannel.setErr(System.err);
            this.sshChannel.open();

            // Wait for channel to close
            this.latch.await();

            // Disconnect from remote host
            this.sshChannel.disconnect();
            this.sshSession.close();
            client.stop();

        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }
    }

    @OnClose
    public void onWebSocketClose(CloseReason reason) {
        this.latch.countDown();
    }

    @OnError
    public void onWebSocketError(Throwable cause) {
        cause.printStackTrace();
    }

    public void run() throws URISyntaxException, DeploymentException, IOException, InterruptedException {
        // Configure SSL context
        SSLContext sslContext = SSLContext.getDefault();
        SslContextConfigurator sslContextConfigurator = new SslContextConfigurator();
        sslContextConfigurator.setSslContext(sslContext);

        // Configure WebSocket client
        ClientManager client = ClientManager.createClient();
        client.getProperties().put(ClientProperties.SSL_CONTEXT, sslContext);
        client.getProperties().put(ClientProperties.AUTH_CONFIG, AuthConfig.Builder.create().build());
        client.connectToServer(this, new URI(WEBSOCKET_URL));

        // Wait for WebSocket session to close
        this.latch.await(1, TimeUnit.DAYS);
    }

    public static void main(String[] args) {
        try {
            RemoteShellClient client = new RemoteShellClient();
            client.run();
        } catch (URISyntaxException | DeploymentException | IOException | InterruptedException e) {
            e.printStackTrace();
        }
    }
}

在这个示例中，我们首先配置了远程主机的连接信息和WebSocket服务器的URL。当从WebSocket接收到文本消息时，我们使用Apache SSH库连接到远程主机并启动一个shell通道来执行接收到的命令。然后等待shell通道关闭，并断开与远程主机的连接。

要运行此程序，您需要将WebSocket和Apache SSH库添加到类路径中，并将示例中的REMOTE_HOST、REMOTE_PORT、REMOTE_USERNAME、REMOTE_PASSWORD、REMOTE_PRIVATE_KEY_PATH、REMOTE_PUBLIC_KEY_PATH和WEBSOCKET_URL替换为实际值。