Re: Read utf-8 file return utf-16 coding hex string ?

From:
moonhkt <moonhkt@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Fri, 29 Jan 2010 00:53:15 -0800 (PST)
Message-ID:
<990608dd-46fb-4280-88b7-f86dcd520c21@2g2000prl.googlegroups.com>
On Jan 29, 3:59 pm, Peter Duniho <NpOeStPe...@NnOwSlPiAnMk.com> wrote:

moonhkt wrote:

Hi All
Why using utf-8, the hex value return 51cc and 6668 ?

od -cx utf8_file01.text

22e5 878c e699 a822 =

 with " befor and after

I don't understand the above. Are you trying to suggest that the te=

xt

'with " befor and after' is part of the output of the "od" program? =

 If

so, why does it not appear to match up with the binary values written
out? And if the characters you're concerned with are at index 101 a=

nd

102, why only eight bytes in the file? And if the file is UTF-8, wh=

y

are you dumping its contents as shorts? Why not just bytes?

Frankly, the whole question doesn't make much sense to me. That sai=

d,

the basic answer to your question is, I believe: UTF-8 and UTF-16 are
different, so of course the bytes used to represent a character in a
UTF-8 file are going to look different from the bytes used to represent
the same character in a UTF-16 data structure.

Pete


System : AIX 5.3

Text file just have two utf-8 chinease character.
cat out_utf.text
=E5=87=8C=E6=99=A8

od -cx out_utf.text
0000000 207 214 231 \n
            e587 8ce6 99a8 0a00
0000007

java to build utf-8 data, input using utf-16 value. I does not know
how to input utf-8 hex value.
My Question is input utf-16 hex value, when write to file with UTF8
codepage, the data will encode to UTF-8 ?
Do you know hwo to input hex value of utf-8 ? I tried \0xe5 not works.

import java.io.*;
public class build_utf01 {
   public static void main(String[] args)
       throws UnsupportedEncodingException {

     // I want console output in UTF-8
     PrintStream sysout = new PrintStream(System.out, true, "UTF-8");
try {
    File oFile = new File("out_utf.text");
    BufferedWriter out = new BufferedWriter(
        new OutputStreamWriter(new FileOutputStream(oFile),"UTF8"));

    /* http://www.fileformat.info/info/unicode/char/51cc/index.htm
     UTF-8 (hex) 0xe5 0x87 0x8c (e5878c)
     UTF-16 (hex) 0x51CC (51cc)
     http://www.fileformat.info/info/unicode/char/6668/index.htm
     UTF-16 (hex) U+6668
     UTF-8 (hex) 0xe6 0x99 0xa8 (e699a8)
     */
     String a = "\u51cc\u6668" ;

     int n = a.length();
     sysout.println("GIVEN STRING IS=" + a);
     sysout.printf("Length of string is %d%n", n);
     sysout.printf("CodePoints in string is %d%n", a.codePointCount
(0,n));
     for (int i = 0; i < n; i++) {
       sysout.printf("Character[%d] is %s%n", i, a.charAt(i));
       out.write(a.charAt(i));
     }
     out.newLine();
     out.close() ;
} catch (IOException e) {
}
}

}

Output utf-8 enabled terminal
java build_utf01
GIVEN STRING IS==E5=87=8C=E6=99=A8
Length of string is 2
CodePoints in string is 2
Character[0] is =E5=87=8C
Character[1] is =E6=99=A8

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