如何将String转换为十六进制？

Question

I have a TCP Client running on Android. The Server is an OBD2 Dongle. I am getting an InputStream which is saved in a String but it's a hex number.

The Response of the TCP Server looks like that: FD A8 F1 FF 1F D0 03 20 It is a 8byte long hex number but I it is sent as a String, so I need to convert it to hex.

How can I do that?

Edit:

InputStream is; 

is = socket.getInputStream(); 

while(var_Receive){

BufferedReader rd = new BufferedReader(new InputStreamReader(is); 

String line = rd.readLine(); 

System.out.prinln(line); 

} 

And this is exactly what I see on screnn 'FD A8 F1 FF 1F D0 03 20' including the spaces between.

Answer 1

试试这个：Integer.toHexString（Integer.parseInt（String））;

Answer 2

Try the below code it will work. The value printed in console is in hexadecimal format. Store it if you want to use it later.

public static void stringToHex(){

    String hexStr = "FD A8 F1 FF 1F D0 03 20";
    char[] chars = hexStr.toCharArray();

      StringBuffer hex = new StringBuffer();
      hex = new StringBuffer("0x");
      int  i =0;
      while(i<chars.length){
          if(chars[i]==' '){
              i++;
              //you can store this value if you want
              System.out.println(hex.toString());
              hex = new StringBuffer("0x");
              continue;
          }
          hex.append(chars[i]);
          i++;
      }
}

Shorter implementation according to requirement:

String hexStr = "FD A8 F1 FF 1F D0 03 20";
String[] hexStrs = hexStr.split(" ");
DecimalFormat df = new DecimalFormat("#.00");
Double[] values = new Double[hexStrs.length];
for(int i=0; i<hexStrs.length; i++){
    values[i] = Double.valueOf(df.format(Integer.valueOf(hexStrs[i], 16)*0.04));
    System.out.println(values[i]);
}

Answer 3

Do the values in the hex representation represent a single value? If so:

String hexStr = "FD A8 F1 FF 1F D0 03 20";
String hexNoSpace = hexStr.Replace(" ", string.Empty);

long valAsLong = long.Parse(hexNoSpace, NumberStyles.AllowHexSpecifier);
ulong valAsUnsignedLong = ulong.Parse(hexNoSpace, NumberStyles.AllowHexSpecifier);

result:

as long: -168618907973713120

as ulong: 18278125165735838496