Java IO Stream sequence column one: character encoding

1. character encoding

Let's take a look at the different character encodings.

String s = " Java ABC ";

1. 1 utf-8 encoding

UTF8 code: Chinese Occupation 3 bytes, English occupation 1 of bytes

byte [] bytes = S.getbytes ("Utf-8");

          for ( byte B:bytes) {

          // convert bytes (converted to int ) with 16 byte display

System. out . Print (Integer. tohexstring (b & 0xff) + "  " );

     }

     system. out .println (); // wrap

output:e6 e8 af 12> be

1.2 gbk encoding

GBK code: Chinese Occupation 2 bytes, English occupation 1 of bytes

byte [] Bytes2 = S.getbytes ("GBK");

      for ( byte

System. out . Print (Integer. tohexstring (b & 0xff) + "  " );

     }

      system. out .println ();

output:c4 BD BF ce 2>

1.3 utf-16be encoding

Utf-16be encoding is Java the encoding format, Chinese occupation 2 bytes, English Chinese occupation 2 of bytes

byte [] Bytes3 = S.getbytes ("utf-16be");

      for ( byte

System. out . Print (Integer. tohexstring (b & 0xff) + "  " );

     }

      system. out .println ();

output: 8b Fe 0 2> 0 0 43< /c21>

1.4 garbled problem

The reason for the garbled problem is simple, because the encoding and decoding are inconsistent with the character coding. Such as: The above bytes3 byte data is a utf-16be format byte sequence, if decoding the time with utf-8 words, will appear garbled.

String str1 = new String (BYTES3);

System. out . println (str1);

output:aU??

How to solve the garbled problem? The method is also very simple, that is, the encoding and decoding using the same character code.

String str2 = new String (Bytes3, "Utf-16be");

System. out . println (str2);

1.5 text file

      * a text file is a sequence of bytes, which can be any encoded sequence of bytes

* If a text file is created on a Chinese machine, the text file only knows the ANSI encoding

Java IO Stream sequence column one: character encoding