Question

我使用byte[512]从Java中的套接字中恢复数据

我使用函数bytesToHexString使其可见

public static String bytesToHexString(byte[] src) {
    StringBuilder stringBuilder = new StringBuilder("");
    if (src == null || src.length <= 0) {
        return null;
    }
    for (int i = 0; i < src.length; i++) {
        int v = src[i] & 0xFF;
        String hv = Integer.toHexString(v);
        if (hv.length() < 2) {
            stringBuilder.append(0);
        }
        stringBuilder.append(hv + " ");
    }
    return stringBuilder.toString();
}

它看起来像那样：

50 1c 04 80 00 00 ce 01 4d 6f 64 69 6d 20 66 61 73 68 69 6f 6e 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 64 33 36 30 57 69 46 69 2d 36 38 38 38 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 5a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 50 74 69 6d 65 6c 65 73 73 67 7a 32 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4b 77 7a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 43 74 69 6d 65 6c 65 73 73 67 7a 31 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 39 72 69 6e 67 69 65 72 67 75 65 73 74 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 39 73 77 65 65 74 20 62 61 62 79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 34 4a 49 4d 4d 59 20 33 47 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 28 42 65 72 74 2d 43 6f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 28 54 50 2d 4c 49 4e 4b 5f 43 42 44 30 34 43 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 25 43 68 69 6e 61 4e 65 74 2d 47 50 69 36 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 23 43 68 69 6e 61 4e 65 74 2d 55 6c 36 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 11 62 6c 75 65 31 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 11 95 bd 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

我所知道的是C中的这个结构：

typedef struct _xchip_cmd_head {
  u16 flag; //always 50 1c
  u16 cmd; // commands, return cmd=cmd|0x8000
  u16 cmd_status; //return result
  u16 datalen; 
  u8 data[1]; 
}xchip_cmd_head_t;

50 1c是开始标志

04 80是命令

00 00是状态

ce 01是数据的长度。

以及ce 01

之后

是ssid的列表：

typedef  struct  _ApList_str  
{  
  char ssid[32];  
  char ApPower;  // min:0, max:100
}ApList_str;

那么如何在Java中获取ssid列表呢？

我做了一些搜索，有没有办法使用ByteBuffer？

Answer 1

50 1c是开始标志

04 80是命令

00 00是状态

ce 01是ssid列表长度

如果上面的列表是常量，与应用程序协议缓冲区类似，那么您可以解析bytearray并打印值。检查半径包的解析。

Answer 2

你不会说ApPower编码的位置，但是否则这个类会做你想要的。

public class ApList_str {

    private final String ssid;
    private int ApPower = -1; /* Unknown */

    public ApList_str(String ssid) {

        this.ssid = ssid;
    }

    public String getSsid() {
        return ssid;
    }

    public int getApPower() {
        return ApPower;
    }

    public void setApPower(int apPower) {
        ApPower = apPower;
    }

    public static ApList_str fromBytes(ByteBuffer b) throws UnsupportedEncodingException {

        byte[] ssid_bytes = new byte[32];
        b.get(ssid_bytes);

        /* You should change the encoding depending on your situation */
        return new ApList_str(new String(ssid_bytes, "UTF-8"));
    }
}

Answer 3

最后我通过这个函数拿起了ssid列表，

看起来很愚蠢，但它确实有效，

我想找到更好的方法：

public static List<String> getSsidList(byte[] byteRecv) {
            System.out.println("get from device");
            List<String> ssidListOpt = new ArrayList<String>();

            try {
                if (byteRecv[0] != 0) {
                    String test = BytesUtil.bytesToHexString(byteRecv);//make it visabled
                    test = test.replace(" ", "");// replace the space
                    test = test.substring(16);//get rid of the head data
                    String temp = "";


                    for (int i = 0; i < test.length(); i++) { //split the ssid,add "," between every ssid item
                        if (i % 66 == 0 && i != 0) {
                            temp += ",";
                        }
                        temp += test.substring(i, i + 1);

                    }
                    String temps[] = temp.split(",");//put it into the string array

                    for (int i = 0; i < temps.length; i++) {

                        if (temps[i].endsWith("00")) {
                            continue;
                        }

                        int l = temps[i].length();
                        String ssidName = temps[i].substring(0, l - 2);//get the hex ssid name
                        ssidName = BytesUtil.deleteLastZero(ssidName);//delete all of 0x00 at the end
                        ssidName = BytesUtil.toStringHex(ssidName);//hex ssid name to string

                        if ("".equals(ssidName)) {
                            continue;
                        }

                        String signal = temps[i].substring(l - 2, l);//get the hex ApPower
                        signal = Integer.parseInt(signal, 16) + "";//hex to int
                        String t[] = { ssidName, signal };
                        System.out.println("" + t[0] + "------" + t[1]);

                        ssidListOpt.add(ssidName);
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return ssidListOpt;
        }

这是我在LogCat中得到的：

02-06 15:06:40.398: I/System.out(20947): Modim fashion------100
02-06 15:06:40.398: I/System.out(20947): tessgz2------80
02-06 15:06:40.398: I/System.out(20947): sweet baby------67
02-06 15:06:40.398: I/System.out(20947): wz------62
02-06 15:06:40.408: I/System.out(20947): Bert-Co------45
02-06 15:06:40.408: I/System.out(20947): ChinaNet-GPi6------40
02-06 15:06:40.408: I/System.out(20947): ringierguest------40
02-06 15:06:40.408: I/System.out(20947): tlessgz1------32
02-06 15:06:40.408: I/System.out(20947): JIMMY 3G------32
02-06 15:06:40.408: I/System.out(20947): blue1------30
02-06 15:06:40.408: I/System.out(20947): ChinaNet-Ul6------25
02-06 15:06:40.408: I/System.out(20947): wudiuandiuan------15

如何从Java中的字节数组中获取数据？

3 个答案: