@ServerEndPoint类的@onMessage方法中的文件访问

import javax.websocket.OnMessage;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;

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

    @OnMessage
    public void onMessage(String message, Session session) {
        // 处理接收到的消息
        if (message.equals("sendFile")) {
            // 读取文件并发送给客户端
            try {
                Path filePath = Path.of("path/to/file.txt");
                byte[] fileData = Files.readAllBytes(filePath);
                session.getBasicRemote().sendBinary(fileData);
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else if (message.startsWith("saveFile")) {
            // 保存客户端发送的文件到服务器端
            try {
                String fileName = message.substring(9);
                Path filePath = Path.of("path/to/save/" + fileName);
                Files.write(filePath, session.getBinaryMessage().getPayload(), StandardOpenOption.CREATE);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}