File Copy garbled

FileInputStream fis = new FileInputStream ("b.txt");
InputStreamReader isr = new InputStreamReader (fis);
FileOutputStream fos = new FileOutputStream ("copy_b.txt");
OutputStreamWriter osw = new OutputStreamWriter (fos);

int i = -1;
while ((i = isr.read ())! = -1) {
System.out.print ((char) isr.read ());
osw.write (i);
}
isr.close ();
osw.close ();
garbled after copying files , please help me find where the problem is , thank you !
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  Reader r = new BufferedReader(new InputStreamReader(in, System.getProperty("file.encoding")));
  Writer w = new BufferedWriter(new OutputStreamWriter(out, System.getProperty("file.encoding")));
  

------ Solution ------------------------------ --------------
brother, you write that i
not a byte array. . .
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InputStreamReader 's read () method returns a character .

landlord code reads a character determine whether -1 , discarded, read a write to the output stream.
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read char, there is the character set problem ,

use ByteArrayInputStream read byte like
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the transferFrom or directly using FileChannel copy
------ For reference transferTo only ---------------------------------------
thank every novice and give you embarrassed
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Thank you for your answer sincerely thank