UTF-8 Encoder / Decoder_utf8encoder-优快云博客

本文介绍了一种UTF-8编码与解码的具体实现方法，包括如何将字符串转换为UTF-8编码的字节数组，以及如何将UTF-8编码的字节数组还原成字符串。该方法适用于处理包含多种语言字符的文本。

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/*

Author : Shivakumar

Mail   : shiva (at) blisspark.com

Disclaimer : This code is provided without any implied or expressed warranty and may not work as

expected. If have any bugs, inform me or post the fix here.

*/

public static String UTF8Decode(byte in[], int offset, int length)

         StringBuffer buff = new StringBuffer();

         int max = offset + length;

         for( int i = offset ; i < max ; i++)

                 char c = 0;

                 if((in[i] & 0x80) == 0)

                          c = (char) in[i];

                 else if(( in[i] & 0xe0 ) == 0xc0)  // 11100000

                          c |= ((in[i] & 0x1f) << 6);        //00011111

                          i++;

                          c |= ((in[i] & 0x3f) << 0);        // 00111111

                 else if(( in[i] & 0xf0) == 0xe0)   // 11110000

                          c |= ((in[i] & 0x0f) << 12);       // 00001111

                          i++;

                          c |= ((in[i] & 0x3f) << 6);        // 00111111

                          i++;

                          c |= ((in[i] & 0x3f) << 0);        // 00111111

                 else if((in[i] & 0xf8) == 0xf0)             // 11111000

                          c |= ((in[i] & 0x07) << 18);       // 00000111 (move 18, not 16?)

                          i++;

                          c |= ((in[i] & 0x3f) << 12);       // 00111111

                          i++;

                          c |= ((in[i] & 0x3f) << 6);        // 00111111

                          i++;

                          c |= ((in[i] & 0x3f) << 0);        // 00111111

                 else

                          c = '?';

                 buff.append(c);

         return buff.toString();

public static byte[] UTF8Encode(String str)

         ByteArrayOutputStream bos = new ByteArrayOutputStream();

try

                 int strlen = str.length();

                 for( int i = 0 ; i < strlen ; i++ )

                          char t = str.charAt(i);

                          int c = 0;

                          c |= ( t & 0xffff );

                          if(c >= 0 && c < 0x80)

                                   bos.write((byte)( c & 0xff ));

                          else if(c > 0x7f && c < 0x000800)

                                   bos.write( (byte) ((( c >>> 6 ) & 0x1f ) | 0xc0 ));

                                   bos.write( (byte) ((( c >>> 0 ) & 0x3f ) | 0x80 ));

                          else if(c > 0x7ff && c < 0x010000)

                                   bos.write( (byte) ((( c >>> 12 ) & 0x0f ) | 0x70 ));

                                   bos.write( (byte) ((( c >>> 6 ) & 0x3f ) | 0x80 ));

                                   bos.write( (byte) ((( c >>> 0 ) & 0x3f ) | 0x80 ));

                          else if(c > 0x00ffff && c < 0x00fffff)

                                   bos.write( (byte) ((( c >>> 18 ) & 0x07 ) | 0xf0 ));

                                   bos.write( (byte) ((( c >>> 12 ) & 0x3f ) | 0x80 ));

                                   bos.write( (byte) ((( c >>> 6 ) & 0x3f ) | 0x80 ));

                                   bos.write( (byte) ((( c >>> 0 ) & 0x3f ) | 0x80 ));

                 bos.flush();

         catch(Exception e)

         return bos.toByteArray();