从GB2312 到 Unicode转换表制作程式

/** 
 * GB2312Unicde.java 
 * Copyright (c) 2003 by Dr. Herong Yang, http://www.herongyang.com/ 
 */ 
import java.io.*; 
import java.nio.*; 
import java.nio.charset.*; 
class GB2312Unicde { 
   static OutputStream out = null; 
   static char hexDigit[] = {'0', '1', '2', '3', '4', '5', '6', '7', 
                             '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; 
   static int b_out[] = {201,267,279,293,484,587,625,657,734,782,827, 
      874,901,980,5590}; 
   static int e_out[] = {216,268,280,294,494,594,632,694,748,794,836, 
      894,903,994,5594}; 
   public static void main(String[] args) { 
      try { 
         out = new FileOutputStream("gb2312.gb"); 
         writeCode(); 
         out.close(); 
      } catch (IOException e) { 
         System.out.println(e.toString()); 
      } 
   } 
   public static void writeCode() throws IOException { 
      boolean reserved = false; 
      String name = null; 
      // GB2312 is not supported by JDK. So I am using GBK. 
      CharsetDecoder gbdc = Charset.forName("GBK").newDecoder(); 
      CharsetEncoder uxec = Charset.forName("UTF-16BE").newEncoder(); 
      CharsetEncoder u8ec = Charset.forName("UTF-8").newEncoder(); 
      ByteBuffer gbbb = null; 
      ByteBuffer uxbb = null; 
      ByteBuffer u8bb = null; 
      CharBuffer cb = null; 
      int count = 0; 
      for (int i=1; i<=94; i++) { 
         // Defining row settings 
         if (i>=1 && i<=9) { 
            reserved = false; 
            name = "Graphic symbols"; 
         } else if (i>=10 && i<=15) { 
            reserved = true; 
            name = "Reserved"; 
         } else if (i>=16 && i<=55) { 
            reserved = false; 
            name = "Level 1 characters"; 
         } else if (i>=56 && i<=87) { 
            reserved = false; 
            name = "Level 2 characters"; 
         } else if (i>=88 && i<=94) { 
            reserved = true; 
            name = "Reserved"; 
         } 
         // writing row title 
         writeln(); 
         writeString("<p>"); 
         writeNumber(i); 
         writeString(" Row: "+name); 
         writeln(); 
         writeString("</p>"); 
         writeln(); 
         if (!reserved) { 
            writeln(); 
            writeHeader(); 
           // looping through all characters in one row 
            for (int j=1; j<=94; j++) { 
               byte hi = (byte)(0xA0 + i); 
               byte lo = (byte)(0xA0 + j); 
               if (validGB(i,j)) { 
                  // getting GB, UTF-16BE, UTF-8 codes 
                  gbbb = ByteBuffer.wrap(new byte[]{hi,lo}); 
                  try { 
                     cb = gbdc.decode(gbbb); 
                     uxbb = uxec.encode(cb); 
                     cb.rewind(); 
                     u8bb = u8ec.encode(cb); 
                  } catch (CharacterCodingException e) { 
                     cb = null; 
                     uxbb = null; 
                     u8bb = null; 
                  } 
               } else { 
                  cb = null; 
                  uxbb = null; 
                  u8bb = null; 
               } 
               writeNumber(i); 
               writeNumber(j); 
               writeString(" "); 
               if (cb!=null) { 
                  writeByte(hi); 
                  writeByte(lo); 
                  writeString(" "); 
                  writeHex(hi); 
                  writeHex(lo); 
                  count++; 
               } else { 
                  writeGBSpace(); 
                  writeString(" null"); 
               } 
               writeString(" "); 
               writeByteBuffer(uxbb,2); 
               writeString(" "); 
               writeByteBuffer(u8bb,3); 
               if (j%2 == 0) { 
                  writeln(); 
               } else { 
                  writeString("   "); 
               } 
            } 
            writeFooter(); 
         } 
      } 
      System.out.println("Number of GB characters worte: "+count); 
   } 
   public static void writeln() throws IOException { 
      out.write(0x0D); 
      out.write(0x0A); 
   } 
   public static void writeByte(byte b) throws IOException { 
      out.write(b & 0xFF); 
   } 
   public static void writeByteBuffer(ByteBuffer b, int l) 
      throws IOException { 
      int i = 0; 
      if (b==null) { 
           writeString("null"); 
           i = 2; 
      } else { 
    for (i=0; i<b.limit(); i++) writeHex(b.get(i)); 
      } 
      for (int j=i; j<l; j++) writeString("  "); 
   } 
   public static void writeGBSpace() throws IOException { 
      out.write(0xA1); 
      out.write(0xA1); 
   } 
   public static void writeString(String s) throws IOException { 
      if (s!=null) { 
         for (int i=0; i<s.length(); i++) { 
            out.write((int) (s.charAt(i) & 0xFF)); 
         } 
      }          
   } 
   public static void writeNumber(int i) throws IOException { 
      String s = "00" + String.valueOf(i); 
      writeString(s.substring(s.length()-2,s.length())); 
   } 
   public static void writeHex(byte b) throws IOException { 
      out.write((int) hexDigit[(b >> 4) & 0x0F]); 
      out.write((int) hexDigit[b & 0x0F]); 
   } 
   public static void writeHeader() throws IOException { 
      writeString("<pre>"); 
      writeln(); 
      writeString("Q.W. "); 
      writeGBSpace(); 
      writeString(" GB   Uni. UTF-8 "); 
      writeString("   "); 
      writeString("Q.W. "); 
      writeGBSpace(); 
      writeString(" GB   Uni. UTF-8 "); 
      writeln(); 
      writeln(); 
   } 
   public static void writeFooter() throws IOException { 
      writeString("</pre>"); 
      writeln(); 
   } 
   public static boolean validGB(int i,int j) { 
      for (int l=0; l<b_out.length; l++) { 
         if (i*100+j>=b_out[l] && i*100+j<=e_out[l]) return false;  
      } 
      return true; 
   } 
}