无法将命令写入我的DataOutputStream

Question

I can't write my command into my DataOutputStream because it needs datatype BYTES , how can i get the bytes from my command?

"tinymix" -> toBytes
"exit" -> toBytes

I somehow need to convert this to Bytes, but how?

Process p = Runtime.getRuntime().exec(new String[]{"su", "-c", "system/bin/sh"});

        DataOutputStream stdin = new DataOutputStream(p.getOutputStream());
        InputStream stdout = p.getInputStream();

        stdin.write("tinymix\n"); // THIS LINE IS BROKEN
        stdin.write("exit\n");   // THIS LINE IS BROKEN

        stdin.flush();
        stdin.close();

Answer 1

You can write a string with (for example) a OutputStreamWriter :

OutputStreamWriter stdin= new OutputStreamWriter(p.getOutputStream());

instread of using a DataOutputStream .

Your code would look like this:

Process p = Runtime.getRuntime().exec(new String[]{"su", "-c", "system/bin/sh"});

OutputStreamWriter stdin = new OutputStreamWriter(p.getOutputStream());
InputStream stdout = p.getInputStream();

stdin.write("tinymix\n");
stdin.write("exit\n");

stdin.flush();
stdin.close();

Answer 2

You can call getBytes() on a string object to get the string as bytes

Change this

stdin.write("tinymix\n"); // THIS LINE IS BROKEN
stdin.write("exit\n");   // THIS LINE IS BROKEN

into this

stdin.write("tinymix\n".getBytes());
stdin.write("exit\n".getBytes());

Answer 3

Try

stdin.writeUTF("str");

That allows you to write strings using DataOutputStream

Then you can use

std.readUTF();

to read your string back