@Data public class ResultDto<T> { /** * 是否成功 */ private boolean success; /** * 操作结果码 */ private int code; /** * 操作结果描述 */ private String msg; /** * 响应数据 */ private T data; /** * 成功结果 * @return */ public static ResultDto ok() { ResultDto resultDto = new ResultDto(); resultDto.setSuccess(ResultDtoConstants.Status.SUCCESS); resultDto.setCode(ResultDtoConstants.Code.SUCCESS); resultDto.setMsg(ResultDtoConstants.SUCCESS_MSG); return resultDto; }

这是一个 Java 类的定义，它包含了一个泛型，命名为 ResultDto。这个类有五个成员变量，分别是 success、code、msg、data 和一个泛型 T。其中，success 表示该操作是否成功，code 表示操作结果码，msg 表示操作结果描述，data 表示响应数据。这个类还包含了一个静态方法 ok()，用于返回一个成功的 ResultDto 对象。

相关问题

@Data public class ResultDto<T> { /** * 是否成功 / private boolean success; /* * 操作结果码 / private int code; /* * 操作结果描述 / private String msg; /* * 响应数据 / private T data; /* * 成功结果 * @return / public static ResultDto ok() { ResultDto resultDto = new ResultDto(); resultDto.setSuccess(ResultDtoConstants.Status.SUCCESS); resultDto.setCode(ResultDtoConstants.Code.SUCCESS); resultDto.setMsg(ResultDtoConstants.SUCCESS_MSG); return resultDto; } /* * 成功结果 * * @return */ public static ResultDto ok(String message) { ResultDto resultDto = new ResultDto(); resultDto.setSuccess(ResultDtoConstants.Status.SUCCESS); resultDto.setCode(ResultDtoConstants.Code.SUCCESS); resultDto.setMsg(message); return resultDto; }

这段代码是一个Java类，定义了一个ResultDto<T>泛型类，用于封装操作结果。其中包含了以下属性：

- success：表示操作是否成功的布尔值。
- code：表示操作结果码的整数值。
- msg：表示操作结果描述的字符串。
- data：表示响应的数据，类型为T。

同时，这个类还包含了两个静态方法ok()，用于返回成功的操作结果。第一个ok()方法返回一个默认的成功操作结果，第二个ok()方法允许用户传入一个自定义的成功消息。

您作为资深java专家，请使用java的 <groupId>net.digger</groupId> <artifactId>utils</artifactId> 包，编写ymodem文件传输工具类，方便调用

好的，下面是一个简单的ymodem文件传输工具类的实现，使用了net.digger.utils包中的一些工具类：

package com.example.ymodem;

import net.digger.util.Hex;
import net.digger.util.HexFormatException;

import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;

public class YModemTransfer {
    private static final int PACKET_SIZE = 1024;
    private static final int PACKET_OVERHEAD = 3;
    private static final int PACKET_DATA_SIZE = PACKET_SIZE - PACKET_OVERHEAD;
    private static final byte SOH = 0x01;
    private static final byte STX = 0x02;
    private static final byte EOT = 0x04;
    private static final byte ACK = 0x06;
    private static final byte NAK = 0x15;
    private static final byte CAN = 0x18;
    private static final byte CRC = 0x43;
    private static final byte ABORT = 0x41;

    private final InputStream in;
    private final OutputStream out;

    public YModemTransfer(InputStream in, OutputStream out) {
        this.in = in;
        this.out = out;
    }

    public void sendFile(File file) throws IOException, InterruptedException {
        FileInputStream fis = new FileInputStream(file);
        BufferedInputStream bis = new BufferedInputStream(fis);

        sendHeader(file.getName(), file.length());

        byte[] buffer = new byte[PACKET_DATA_SIZE];
        int bytesRead;
        int packetNumber = 0;
        while ((bytesRead = bis.read(buffer)) != -1) {
            byte[] packet = createPacket(packetNumber, buffer, bytesRead);
            int attempts = 0;
            boolean success = false;
            while (!success && attempts < 10) {
                out.write(packet);
                int response = in.read();
                if (response == ACK) {
                    success = true;
                } else if (response == NAK) {
                    attempts++;
                } else {
                    throw new IOException("Unexpected response: " + response);
                }
            }
            if (!success) {
                throw new IOException("Failed to send packet");
            }
            packetNumber++;
        }

        sendEOT();

        bis.close();
        fis.close();
    }

    private void sendHeader(String fileName, long fileSize) throws IOException, InterruptedException {
        byte[] header = createHeader(fileName, fileSize);
        int attempts = 0;
        boolean success = false;
        while (!success && attempts < 10) {
            out.write(header);
            int response = in.read();
            if (response == ACK) {
                success = true;
            } else if (response == NAK) {
                attempts++;
            } else {
                throw new IOException("Unexpected response: " + response);
            }
        }
        if (!success) {
            throw new IOException("Failed to send header");
        }
    }

    private void sendEOT() throws IOException, InterruptedException {
        int attempts = 0;
        boolean success = false;
        while (!success && attempts < 10) {
            out.write(EOT);
            int response = in.read();
            if (response == ACK) {
                success = true;
            } else if (response == NAK) {
                attempts++;
            } else {
                throw new IOException("Unexpected response: " + response);
            }
        }
        if (!success) {
            throw new IOException("Failed to send EOT");
        }
    }

    private static byte[] createPacket(int packetNumber, byte[] data, int dataSize) throws IOException {
        if (dataSize > PACKET_DATA_SIZE) {
            throw new IllegalArgumentException("Data too large for packet");
        }
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        baos.write(dataSize == PACKET_DATA_SIZE ? STX : SOH);
        baos.write(packetNumber & 0xff);
        baos.write((~packetNumber) & 0xff);
        baos.write(data, 0, dataSize);
        byte[] crc = calculateCrc(data, dataSize);
        baos.write(crc[0]);
        baos.write(crc[1]);
        return baos.toByteArray();
    }

    private static byte[] createHeader(String fileName, long fileSize) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        baos.write(SOH);
        baos.write(0);
        baos.write(~0);
        byte[] fileNameBytes = fileName.getBytes(StandardCharsets.US_ASCII);
        if (fileNameBytes.length > 128) {
            throw new IllegalArgumentException("File name too long");
        }
        baos.write(fileNameBytes);
        for (int i = 0; i < 128 - fileNameBytes.length; i++) {
            baos.write(0);
        }
        byte[] fileSizeBytes = Long.toString(fileSize).getBytes(StandardCharsets.US_ASCII);
        if (fileSizeBytes.length > 10) {
            throw new IllegalArgumentException("File size too large");
        }
        for (int i = 0; i < 10 - fileSizeBytes.length; i++) {
            baos.write(0);
        }
        baos.write(fileSizeBytes);
        for (int i = 0; i < 128 - fileSizeBytes.length; i++) {
            baos.write(0);
        }
        byte[] crc = calculateCrc(Arrays.copyOfRange(baos.toByteArray(), 3, 131), 128);
        baos.write(crc[0]);
        baos.write(crc[1]);
        return baos.toByteArray();
    }

    private static byte[] calculateCrc(byte[] data, int dataSize) throws IOException {
        try {
            int crc = 0;
            for (int i = 0; i < dataSize; i++) {
                crc = updateCrc(crc, data[i]);
            }
            return Hex.toByteArray(Integer.toHexString(crc & 0xffff).toUpperCase());
        } catch (HexFormatException e) {
            throw new IOException("Failed to calculate CRC", e);
        }
    }

    private static int updateCrc(int crc, byte data) {
        crc = crc ^ ((int) data << 8);
        for (int i = 0; i < 8; i++) {
            if ((crc & 0x8000) != 0) {
                crc = (crc << 1) ^ 0x1021;
            } else {
                crc = crc << 1;
            }
        }
        return crc & 0xffff;
    }
}

这个类包含了一个sendFile方法，它将给定的文件通过YModem协议传输到输出流中。要使用该方法，只需将输入流和输出流传递给YModemTransfer的构造函数，然后调用sendFile方法即可。

例如，以下代码将文件"example.bin"通过YModem协议传输到串口：

SerialPort port = ...; // 获取串口对象
YModemTransfer transfer = new YModemTransfer(port.getInputStream(), port.getOutputStream());
transfer.sendFile(new File("example.bin"));