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我正在尝试发送一些数据字节以通过我的局域网登录到嵌入式设备，但是当我发送数据时，有 2 个字节被附加到 tcp 流中。

这是什么原因造成的？

public class DeviceConnection {

    Device dv;
    Socket s;
    PrintWriter out;
    boolean connected = true;

    public DvsConnection(Device d) {
        try {
            dv = d;
            InetAddress addr = InetAddress.getByName(dv.IP_ADDRESS);
            s = new Socket(addr, dv.ACTIVEX_PORT);
        } catch (Exception ex) {
            System.out.println(ex.toString());
            connected = false;
        }
        Connect();
    }

    private void Connect() {
        int[] headerStrt = {0x67, 0x45, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
        int[] usrName = convert.EncryptStr(15, dv.LOGIN, cypher);
        int[] password = convert.EncryptStr(15, dv.PASSWORD, cypher);
        int[] headerEnd = {
            0x00, 0x00, 0x1b, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00};
        int[] messageArray = convert.concatAll(headerStrt, usrName, spacer2, password, headerEnd);
        try {
            out = new PrintWriter(s.getOutputStream(), true);
            byte[] sbytes=convert.IntArray2ByteArray(messageArray);
            String message=convert.ByteArray2Ascii(sbytes);
            out.println(message);
            String hex = convert.ByteArray2Hex(sbytes);
            System.out.println(hex);
        } catch (Exception ex) {
            System.out.println(ex.toString());
            connected = false;
        }
    }


public class Convert {

    public String ByteArray2Hex(byte[] a) {
        StringBuilder sb = new StringBuilder();
        for (byte b : a) {
            sb.append(String.format("%02x", b & 0xff));
        }
        return sb.toString();
    }

    public String ByteArray2Ascii(byte[] data) {
        StringBuilder sb = new StringBuilder(data.length);
        for (int i = 0; i < data.length; ++i) {
            if (data[i] < 0) {
                throw new IllegalArgumentException();
            }
            sb.append((char) data[i]);
        }
        return sb.toString();
    }

}

控制台输出：

6745000000000000000000004b4c4c29
4d15176d0000000000000000005d4c57
751653543b0808001c00000000001b00
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000

线鲨输出：

00000000  67 45 00 00 00 00 00 00  00 00 00 00 4b 4c 4c 29 gE...... ....KLL)
00000010  4d 15 17 6d 00 00 00 00  00 00 00 00 00 5d 4c 57 M..m.... .....]LW
00000020  75 16 53 54 3b 08 08 00  1c 00 00 00 00 00 1b 00 u.ST;... ........
00000030  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 ........ ........
00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 ........ ........
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 ........ ........
00000060  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 ........ ........
00000070  0d 0a                                            ..
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1 回答 1

2

它println正在添加\r\n，但除此之外你还有一些基本问题。您将二进制数据视为文本。那迟早会咬你。

如果您尝试使用二进制数据，请使用OutputStream和InputStream子类 - 而不是Writer和Reader子类。您已经从套接字获取流 - 为什么将它们包装在PrintWriterand中PrintReader？这是一个根本性的错误，你应该立即纠正。

一旦你停止这样做，你就不会得到额外的“换行”数据，因为当你不考虑文本时，就没有换行之类的东西。有关更多信息，请参阅Marc Gravell 关于 IO 错误的博文。

此外，我强烈建议您开始遵循 Java 命名约定 - 方法是camelCased，而不是PascalCased. 我希望在实际代码中，您的异常处理也有所不同:)

于 2013-09-21T15:51:45.583 回答