How can I receive to socket input as hexadecimal?

Question

I sent a GET message with socket. And I received response message as string. But I want to receive as hexadecimal. But I didn't accomplish. This is my code block as string. Can you help me ?

                    dos = new DataOutputStream(socket.getOutputStream());
                    dis = new BufferedReader(new InputStreamReader(socket.getInputStream()));

                    dos.write(requestMessage.getBytes());
                    String data = "";                       
                    StringBuilder sb = new StringBuilder();
                    while ((data = dis.readLine()) != null) {
                            sb.append(data);
                    }

it means you want to read the input from socket in a `byte[]` format..??? — ELITE, May 16 '15 at 11:57
may this is helpful http://stackoverflow.com/questions/4117791/read-binary-data-from-a-socket — Viraj Nalawade, May 16 '15 at 12:03
If you want to receive something in hexadecimal notation then it should first of all be sent in hexadecimal notation. Please tell first what is going on. — greenapps, May 16 '15 at 12:42
`I sent a GET message with socket.` Really? Very special. Usually one sends a GET request with a http component. Please explain why you use a socket directly. — greenapps, May 16 '15 at 12:44
You are right but this is my graduation project. And we wanted to sent GET message as manually. Actually I didnt want to use socket. But I dont know TCP/IP. Socket already make this layer. — Fatih ELMA, May 16 '15 at 12:49

score 3 · Accepted Answer · edited May 23 '17 at 12:08

when you use BufferedReader you'll get the input into String format..so better way to use InputStream...

here is sample code to achieve this.

        InputStream in = socket.getInputStream();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] read = new byte[1024];
        int len;
        while((len = in.read(read)) > -1) {
            baos.write(read, 0, len);
        }
        // this is the final byte array which contains the data
        // read from Socket
        byte[] bytes = baos.toByteArray();

after getting the byte[] you can convert it to hex string using the following function

StringBuilder sb = new StringBuilder();
for (byte b : bytes) {
    sb.append(String.format("%02X ", b));
}
System.out.println(sb.toString());// here sb is hexadecimal string

reference from java-code-to-convert-byte-to-hexadecimal

Actually I must receive as hexadecimal. I just learned it. https://code.google.com/p/rest-client/issues/detail?id=171. Do you have an idea about this? — Fatih ELMA, May 16 '15 at 12:32
you can convert `byte[]` to hex string using `String.format();` method — ELITE, May 16 '15 at 16:48

How can I receive to socket input as hexadecimal?

1 Answers1