在Java中从二进制文件正确读取数据

Question

I have problem with reading understood data, when I used Parsing (char) the numbers became strange char in ASCII, here is the code :

static void doTestByteFiles() throws IOException {

   File file = new File("sample1.data");
   FileOutputStream outStream = new FileOutputStream(file); //Warning!!!!

   byte[] outByteArray = {10,20,30,40,50,60,70,80,(byte)'J',(byte)'a',(byte)'v',(byte)'a'};


   outStream.write(outByteArray);
   outStream.close();

   FileInputStream inStream = new  FileInputStream(file);

   int fileSize = (int) file.length();
   byte[] inByteArray = new byte[fileSize];
   inStream.read(inByteArray);

   for (int i = 0; i < fileSize; i++) {
     System.out.println((char) inByteArray[i]);
   }

inStream.close();
 }

the result:

( 2 < FPJ ava

result I expect : 10 20 30 40 50 60 70 80 J ava

I tried to use (byte) instead (char), same problem but the Java word became numbers in ASCII , Any help please ?

Answer 1

The numbers in the byte[] array are interpreted as byte values. You have to write Intergers and convert them to byte inside the array.